Add configuration for the SAMD20 Xplained Pro board. Initial check a low-effor, unverified clone of thoe SAM4L Xplained Pro board configuration

2026-05-21 21:34:07 +08:00 · 2014-02-12 17:21:28 -06:00
parent ca9a8e5875
commit 126fcbac7d
23 changed files with 4057 additions and 8 deletions
@@ -301,7 +301,7 @@ NuttX EABI "buildroot" Toolchain
  1. You must have already configured Nuttx in <some-dir>/nuttx.

     cd tools
-     ./configure.shsam4l-xplained/<sub-dir>
+     ./configure.sh sam4l-xplained/<sub-dir>

  2. Download the latest buildroot package into <some-dir>

@@ -602,7 +602,7 @@ Configurations
  can be selected as follow:

    cd tools
-    ./configure.shsam4l-xplained/<subdir>
+    ./configure.sh sam4l-xplained/<subdir>
    cd -
    . ./setenv.sh

@@ -196,7 +196,7 @@
 /* LED definitions ******************************************************************/
 /* There are three LEDs on board the SAM4L Xplained Pro board:  The EDBG
 * controls two of the LEDs, a power LED and a status LED.  There is only
- * one user controllable LED, a yellow LED labeled LED0 near the SAM4L USB
+ * one user controllable LED, a yellow LED labelled LED0 near the SAM4L USB
 * connector.
 *
 * This LED is controlled by PC07 and LED0 can be activated by driving the
@@ -214,7 +214,7 @@

 /* When CONFIG_ARCH_LEDS is defined in the NuttX configuration, NuttX will
 * control LED0 as defined below.  Thus if LED0 is statically on, NuttX has
- * successfully booted and is, apparently, running normmally.  If LED0 is
+ * successfully booted and is, apparently, running normally.  If LED0 is
 * flashing at approximately 2Hz, then a fatal error has been detected and the
 * system has halted.
 */
@@ -245,7 +245,7 @@
 *   PC24 SW0
 */

-/* The STM32F4 Discovery supports one button: */
+/* The SAM4l Xplained Pro supports one button: */

 #define BUTTON_SW0         0
 #define NUM_BUTTONS        1
@@ -309,7 +309,7 @@ extern "C" {
 *
 * Description:
 *   All SAM3U architectures must provide the following entry point.  This entry point
- *   is called early in the intitialization -- after all memory has been configured
+ *   is called early in the initialization -- after all memory has been configured
 *   and mapped but before any devices have been initialized.
 *
 ************************************************************************************/
@@ -1,5 +1,5 @@
 /****************************************************************************
- * configs/sam3u-ek/scripts/ld.script
+ * configs/sam4l-xplained/scripts/ld.script
 *
 *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
@@ -1,5 +1,5 @@
 /****************************************************************************
- * config/shenzhou/src/sam_mmcsd.c
+ * config/sam4l-xplained/src/sam_mmcsd.c
 *
 *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
@@ -0,0 +1,55 @@
+#
+# For a description of the syntax of this configuration file,
+# see misc/tools/kconfig-language.txt.
+#
+
+if ARCH_BOARD_SAMD20_XPLAINED
+
+menu "SAMD20 Xplained Pro Modules"
+
+config SAMD20_XPLAINED_IOMODULE
+	bool "I/O1 Module"
+	default n
+	---help---
+		The I/O 1 module is attached.  This module provides an MMC/SD card
+		slot.
+
+if SAMD20_XPLAINED_IOMODULE
+
+choice
+	prompt "I/O1 Module Location"
+	default SAMD20_XPLAINED_IOMODULE_EXT1
+
+config SAMD20_XPLAINED_IOMODULE_EXT1
+	bool "EXT1"
+
+config SAMD20_XPLAINED_IOMODULE_EXT2
+	bool "EXT2"
+
+endchoice
+endif
+
+config SAMD20_XPLAINED_OLED1MODULE
+	bool "OLED1 Module"
+	default n
+	---help---
+		The OLED 1 module is attached.  This module provides an OLED plus 3
+		additional switches and 3 additional LEDs.
+
+if SAMD20_XPLAINED_OLED1MODULE
+
+choice
+	prompt "OLED1 Module Location"
+	default SAMD20_XPLAINED_OLED1MODULE_EXT1
+
+config SAMD20_XPLAINED_OLED1MODULE_EXT1
+	bool "EXT1"
+
+config SAMD20_XPLAINED_OLED1MODULE_EXT2
+	bool "EXT2"
+
+endchoice
+endif
+
+endmenu
+endif
@@ -0,0 +1,300 @@
+/************************************************************************************
+ * configs/samd20-xplained/include/board.h
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+#ifndef __CONFIGS_SAMD20_XPLAINED_INCLUDE_BOARD_H
+#define __CONFIGS_SAMD20_XPLAINED_INCLUDE_BOARD_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#ifndef __ASSEMBLY__
+#  include <stdint.h>
+#  ifdef CONFIG_GPIO_IRQ
+#    include <arch/irq.h>
+#  endif
+#endif
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+
+/* Clocking *************************************************************************/
+
+/* Select the DFLL as the source of the system clock.
+ *
+ * Options (define one):
+ *   BOARD_SYSCLK_SOURCE_RCSYS     - System RC oscillator
+ *   BOARD_SYSCLK_SOURCE_OSC0      - Oscillator 0
+ *   BOARD_SYSCLK_SOURCE_PLL0      - Phase Locked Loop 0
+ *   BOARD_SYSCLK_SOURCE_DFLL0     - Digital Frequency Locked Loop
+ *   BOARD_SYSCLK_SOURCE_RC80M     - 80 MHz RC oscillator
+ *   BOARD_SYSCLK_SOURCE_FCFAST12M - 12 MHz RC oscillator
+ *   BOARD_SYSCLK_SOURCE_FCFAST8M  - 8 MHz RC oscillator
+ *   BOARD_SYSCLK_SOURCE_FCFAST4M  - 4 MHz RC oscillator
+ *   BOARD_SYSCLK_SOURCE_RC1M      - 1 MHz RC oscillator
+ */
+
+#define BOARD_SYSCLK_SOURCE_DFLL0  1
+
+/* Nominal frequencies in on-chip RC oscillators.  These are *not* configurable
+ * but appear here for use in frequency calculations.  NOTE: These may frequencies
+ * may vary with temperature changes.
+ */
+
+#define BOARD_RCSYS_FREQUENCY      115000   /* Nominal frequency of RCSYS (Hz) */
+#define BOARD_RC32K_FREQUENCY      32768    /* Nominal frequency of RC32K (Hz) */
+#define BOARD_RC80M_FREQUENCY      80000000 /* Nominal frequency of RC80M (Hz) */
+#define BOARD_RCFAST4M_FREQUENCY   4000000  /* Nominal frequency of RCFAST4M (Hz) */
+#define BOARD_RCFAST8M_FREQUENCY   8000000  /* Nominal frequency of RCFAST8M (Hz) */
+#define BOARD_RCFAST12M_FREQUENCY  12000000 /* Nominal frequency of RCFAST12M (Hz) */
+#define BOARD_RC1M_FREQUENCY       1000000  /* Nominal frequency of RC1M (Hz) */
+
+/* The SAMD20 Xplained Pro has two on-board crystals:
+ *   XC100 12MHz     OSC0
+ *   XC101 32.768KHz OSC32
+ */
+
+/* OSC0 Configuration */
+
+#define BOARD_OSC0_FREQUENCY       12000000 /* 12MHz XTAL */
+
+/* OSC32 Configuration */
+
+#define BOARD_OSC32_FREQUENCY      32768    /* 32.768KHz XTAL */
+#define BOARD_OSC32_STARTUP_US     6100
+#define BOARD_OSC32_SELCURR        BSCIF_OSCCTRL32_SELCURR_300
+#define BOARD_OSC32_ISXTAL         1        /* OSC32 is a crystal */
+
+/* Digital Frequency Locked Loop configuration
+ *  Fdfll = (Fclk * DFLLmul) / DFLLdiv
+ *        = 32768 * (48000000/32768) / 1 = 48MHz
+ *
+ * The actual frequency is 47.97MHz due to truncation of the multiplier.
+ * The 48MHz target value is treated as "not-to-exceed" value).  Use OSC0
+ * if you need more accuracy (12MHz with a multiplier of 4).
+ *
+ * DFLL0 source options (select one):
+ *   BOARD_DFLL0_SOURCE_RCSYS      - System RC oscillator
+ *   BOARD_DFLL0_SOURCE_OSC32K     - 32.768KHz oscillator
+ *   BOARD_DFLL0_SOURCE_OSC0       - Oscillator 0
+ *   BOARD_DFLL0_SOURCE_RC80M      - 80 MHz RC oscillator
+ *   BOARD_DFLL0_SOURCE_RC32K      - 32 kHz RC oscillator
+ *
+ * NOTE: Nothing must be defined if the DFPLL is not used
+ */
+
+#define BOARD_DFLL0_SOURCE_OSC32K  1
+#define BOARD_DFLL0_TARGET         48000000
+#define BOARD_DFLL0_MUL            (BOARD_DFLL0_TARGET / BOARD_OSC32_FREQUENCY)
+#define BOARD_DFLL0_DIV            1
+#define BOARD_DFLL0_FREQUENCY      (BOARD_OSC32_FREQUENCY * BOARD_DFLL0_MUL / BOARD_DFLL0_DIV)
+
+/* Phase Locked Loop configuration
+ *  Fdfll = (Fclk * PLLmul) / PLLdiv
+ *
+ * PLL0 source options (select one):
+ *   BOARD_PLL0_SOURCE_OSC0        - Oscillator 0
+ *   BOARD_PLL0_SOURCE_GCLK9       - General clock 9
+ *
+ *   BOARD_GLCK9_SOURCE_RCSYS      - System RC oscillator
+ *   BOARD_GLCK9_SOURCE_OSC32K     - Output from OSC32K
+ *   BOARD_GLCK9_SOURCE_DFLL0      - Output from DFLL0
+ *   BOARD_GLCK9_SOURCE_OSC0       - Output from Oscillator0
+ *   BOARD_GLCK9_SOURCE_RC80M      - Output from 80MHz RCOSC
+ *   BOARD_GLCK9_SOURCE_RCFAST     - Output from 4,8,12MHz RCFAST
+ *   BOARD_GLCK9_SOURCE_RC1M       - Output from 1MHz RC1M
+ *   BOARD_GLCK9_SOURCE_CPUCLK     - The CPU clock
+ *   BOARD_GLCK9_SOURCE_HSBCLK     - High Speed Bus clock
+ *   BOARD_GLCK9_SOURCE_PBACLK     - Peripheral Bus A clock
+ *   BOARD_GLCK9_SOURCE_PBBCLK     - Peripheral Bus B clock
+ *   BOARD_GLCK9_SOURCE_PBCCLK     - Peripheral Bus C clock
+ *   BOARD_GLCK9_SOURCE_PBDCLK     - Peripheral Bus D clock
+ *   BOARD_GLCK9_SOURCE_RC32K      - Output from 32kHz RCOSC
+ *
+ * NOTE: Nothing must be defined if the PLL0 is not used
+ */
+
+/* System clock dividers: Fbus = Fmck >> BUSshift */
+
+#define BOARD_CPU_SHIFT            0 /* Fcpu = Fmck = 48MHz */
+#define BOARD_PBA_SHIFT            0 /* Fpba = Fmck = 48MHz */
+#define BOARD_PBB_SHIFT            0 /* Fpbb = Fmck = 48MHz */
+#define BOARD_PBC_SHIFT            0 /* Fpbc = Fmck = 48MHz */
+#define BOARD_PBD_SHIFT            0 /* Fpbd = Fmck = 48MHz */
+
+/* Resulting frequencies */
+
+#define BOARD_MCK_FREQUENCY        (BOARD_DFLL0_FREQUENCY)
+#define BOARD_CPU_FREQUENCY        (BOARD_MCK_FREQUENCY >> BOARD_CPU_SHIFT)
+#define BOARD_PBA_FREQUENCY        (BOARD_MCK_FREQUENCY >> BOARD_PBA_SHIFT)
+#define BOARD_PBB_FREQUENCY        (BOARD_MCK_FREQUENCY >> BOARD_PBB_SHIFT)
+#define BOARD_PBC_FREQUENCY        (BOARD_MCK_FREQUENCY >> BOARD_PBC_SHIFT)
+#define BOARD_PBD_FREQUENCY        (BOARD_MCK_FREQUENCY >> BOARD_PBD_SHIFT)
+
+/* USBC.
+ *
+ * "The USBC has two bus clocks connected: One High Speed Bus clock
+ *  (CLK_USBC_AHB) and one Peripheral Bus clock (CLK_USBC_APB). These clocks
+ *  are generated by the Power Manager.  Both clocks are enabled at reset
+ *  and can be disabled by the Power Manager. It is recommended to disable
+ *  the USBC before disabling the clocks, to avoid freezing the USBC in
+ *  an undefined state.
+ *
+ * "To follow the usb data rate at 12Mbit/s in full-speed mode, the
+ *  CLK_USBC_AHB clock should be at minimum 12MHz.
+ *
+ * "The 48MHz USB clock is generated by a dedicated generic clock from
+ *  the SCIF module. Before using the USB, the user must ensure that the
+ *  USB generic clock (GCLK_USBC) is enabled at 48MHz in the SCIF module."
+ *
+ * USB Generic Clock 7 (GCLK_USBC) source selection (one only)
+ *
+ *   BOARD_USBC_SRC_OSC0
+ *   BOARD_USBC_SRC_PLL0
+ *   BOARD_USBC_SRC_DFLL
+ *   BOARD_USBC_SRC_GCLKIN0
+ */
+
+#define BOARD_USBC_SRC_DFLL        1 /* Source DFLL0 at 48MHz */
+#define BOARD_USBC_GCLK_DIV        1 /* Fusb = Fdfll / 1 = 48MHz */
+
+/* LED definitions ******************************************************************/
+/* There are three LEDs on board the SAMD20 Xplained Pro board:  The EDBG
+ * controls two of the LEDs, a power LED and a status LED.  There is only
+ * one user controllable LED, a yellow LED labelled STATUS near the SAMD20 USB
+ * connector.
+ *
+ * This LED is controlled by PC07 and the LED can be activated by driving the
+ * PA14 to GND.
+ */
+
+/* LED index values for use with sam_setled() */
+
+#define BOARD_STATUS_LED     0
+#define BOARD_NLEDS          1
+
+/* LED bits for use with sam_setleds() */
+
+#define BOARD_STATUS LED_BIT (1 << BOARD_STATUS_LED)
+
+/* When CONFIG_ARCH_LEDS is defined in the NuttX configuration, NuttX will
+ * control the LED as defined below.  Thus if the LED is statically on, NuttX has
+ * successfully booted and is, apparently, running normally.  If the LED is
+ * flashing at approximately 2Hz, then a fatal error has been detected and the
+ * system has halted.
+ */
+
+#define LED_STARTED       0 /* STATUS LED=OFF */
+#define LED_HEAPALLOCATE  0 /* STATUS LED=OFF */
+#define LED_IRQSENABLED   0 /* STATUS LED=OFF */
+#define LED_STACKCREATED  1 /* STATUS LED=ON */
+#define LED_INIRQ         2 /* STATUS LED=no change */
+#define LED_SIGNAL        2 /* STATUS LED=no change */
+#define LED_ASSERTION     2 /* STATUS LED=no change */
+#define LED_PANIC         3 /* STATUS LED=flashing */
+
+/* Button definitions ***************************************************************/
+/* Mechanical buttons:
+ *
+ * The SAMD20 Xplained Pro contains two mechanical buttons. One button is the
+ * RESET button connected to the SAMD20 reset line and the other is a generic user
+ * configurable button. When a button is pressed it will drive the I/O line to GND.
+ *
+ *   PA15 SW0
+ */
+
+/* The SAMD20 Xplained Pro supports one button: */
+
+#define BUTTON_SW0         0
+#define NUM_BUTTONS        1
+
+#define BUTTON_SW0_BIT     (1 << BUTTON_SW0)
+
+/************************************************************************************
+ * Public Data
+ ************************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/************************************************************************************
+ * Public Function Prototypes
+ ************************************************************************************/
+/************************************************************************************
+ * Name: sam_boardinitialize
+ *
+ * Description:
+ *   All SAM3U architectures must provide the following entry point.  This entry point
+ *   is called early in the initialization -- after all memory has been configured
+ *   and mapped but before any devices have been initialized.
+ *
+ ************************************************************************************/
+
+void sam_boardinitialize(void);
+
+/************************************************************************************
+ * Name:  sam_ledinit, sam_setled, and sam_setleds
+ *
+ * Description:
+ *   If CONFIG_ARCH_LEDS is defined, then NuttX will control the on-board LEDs.  If
+ *   CONFIG_ARCH_LEDS is not defined, then the following interfaces are available to
+ *   control the LEDs from user applications.
+ *
+ ************************************************************************************/
+
+#ifndef CONFIG_ARCH_LEDS
+void sam_ledinit(void);
+void sam_setled(int led, bool ledon);
+void sam_setleds(uint8_t ledset);
+#endif
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif  /* __CONFIGS_SAMD20_XPLAINED_INCLUDE_BOARD_H */
@@ -0,0 +1,122 @@
+############################################################################
+# configs/samd20-xplained/nsh/Make.defs
+#
+#   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+include ${TOPDIR}/.config
+include ${TOPDIR}/tools/Config.mk
+include ${TOPDIR}/arch/arm/src/armv6-m/Toolchain.defs
+
+LDSCRIPT = flash.ld
+
+ifeq ($(WINTOOL),y)
+  # Windows-native toolchains
+  ARCHINCLUDES = -I. -isystem "${shell cygpath -w $(TOPDIR)/include}"
+  ARCHXXINCLUDES = -I. -isystem "${shell cygpath -w $(TOPDIR)/include}" -isystem "${shell cygpath -w $(TOPDIR)/include/cxx}"
+  ARCHSCRIPT = -T "${shell cygpath -w $(TOPDIR)/configs/$(CONFIG_ARCH_BOARD)/scripts/$(LDSCRIPT)}"
+else
+  # Linux/Cygwin-native toolchain
+  ARCHINCLUDES = -I. -isystem $(TOPDIR)/include
+  ARCHXXINCLUDES = -I. -isystem $(TOPDIR)/include -isystem $(TOPDIR)/include/cxx
+  ARCHSCRIPT = -T$(TOPDIR)/configs/$(CONFIG_ARCH_BOARD)/scripts/$(LDSCRIPT)
+endif
+
+CC = $(CROSSDEV)gcc
+CXX = $(CROSSDEV)g++
+CPP = $(CROSSDEV)gcc -E
+LD = $(CROSSDEV)ld
+AR = $(ARCROSSDEV)ar rcs
+NM = $(ARCROSSDEV)nm
+OBJCOPY = $(CROSSDEV)objcopy
+OBJDUMP = $(CROSSDEV)objdump
+
+ARCHCCVERSION = ${shell $(CC) -v 2>&1 | sed -n '/^gcc version/p' | sed -e 's/^gcc version \([0-9\.]\)/\1/g' -e 's/[-\ ].*//g' -e '1q'}
+ARCHCCMAJOR = ${shell echo $(ARCHCCVERSION) | cut -d'.' -f1}
+
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+  ARCHOPTIMIZATION = -g
+endif
+
+ifneq ($(CONFIG_DEBUG_NOOPT),y)
+  ARCHOPTIMIZATION += $(MAXOPTIMIZATION) -fno-strict-aliasing -fno-strength-reduce -fomit-frame-pointer
+endif
+
+ARCHCFLAGS = -fno-builtin
+ARCHCXXFLAGS = -fno-builtin -fno-exceptions -fno-rtti
+ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow
+ARCHWARNINGSXX = -Wall -Wshadow
+ARCHDEFINES =
+ARCHPICFLAGS = -fpic -msingle-pic-base -mpic-register=r10
+
+CFLAGS = $(ARCHCFLAGS) $(ARCHWARNINGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
+CPICFLAGS = $(ARCHPICFLAGS) $(CFLAGS)
+CXXFLAGS = $(ARCHCXXFLAGS) $(ARCHWARNINGSXX) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHXXINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
+CXXPICFLAGS = $(ARCHPICFLAGS) $(CXXFLAGS)
+CPPFLAGS = $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES)
+AFLAGS = $(CFLAGS) -D__ASSEMBLY__
+
+NXFLATLDFLAGS1 = -r -d -warn-common
+NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)/binfmt/libnxflat/gnu-nxflat-pcrel.ld -no-check-sections
+LDNXFLATFLAGS = -e main -s 2048
+
+OBJEXT = .o
+LIBEXT = .a
+EXEEXT =
+
+ifneq ($(CROSSDEV),arm-nuttx-elf-)
+  LDFLAGS += -nostartfiles -nodefaultlibs
+endif
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+  LDFLAGS += -g
+endif
+
+
+HOSTCC = gcc
+HOSTINCLUDES = -I.
+HOSTCFLAGS = -Wall -Wstrict-prototypes -Wshadow -g -pipe
+HOSTLDFLAGS =
+ifeq ($(CONFIG_HOST_WINDOWS),y)
+  HOSTEXEEXT = .exe
+else
+  HOSTEXEEXT =
+endif
+
+ifeq ($(WINTOOL),y)
+  # Windows-native host tools
+  DIRLINK = $(TOPDIR)/tools/copydir.sh
+  DIRUNLINK = $(TOPDIR)/tools/unlink.sh
+  MKDEP = $(TOPDIR)/tools/mknulldeps.sh
+else
+  # Linux/Cygwin-native host tools 
+  MKDEP = $(TOPDIR)/tools/mkdeps$(HOSTEXEEXT)
+endif
@@ -0,0 +1,75 @@
+#!/bin/bash
+# configs/samd20-xplained/nsh/setenv.sh
+#
+#   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+if [ "$_" = "$0" ] ; then
+  echo "You must source this script, not run it!" 1>&2
+  exit 1
+fi
+
+WD=`pwd`
+if [ ! -x "setenv.sh" ]; then
+  echo "This script must be executed from the top-level NuttX build directory"
+  exit 1
+fi
+
+if [ -z "${PATH_ORIG}" ]; then
+  export PATH_ORIG="${PATH}"
+fi
+
+# This is the Cygwin path to the location where I installed the Atmel GCC
+# toolchain under Windows.  You will also have to edit this if you install
+# this toolchain in any other location
+#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/Atmel/Atmel Toolchain/ARM GCC/Native/4.7.3.99/arm-gnu-toolchain/bin"
+
+# This is the Cygwin path to the location where I installed the CodeSourcery
+# toolchain under windows.  You will also have to edit this if you install
+# the CodeSourcery toolchain in any other location
+#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/CodeSourcery/Sourcery G++ Lite/bin"
+export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/CodeSourcery/Sourcery_CodeBench_Lite_for_ARM_EABI/bin"
+
+# These are the Cygwin paths to the locations where I installed the Atollic
+# toolchain under windows.  You will also have to edit this if you install
+# the Atollic toolchain in any other location.  /usr/bin is added before
+# the Atollic bin path because there is are binaries named gcc.exe and g++.exe
+# at those locations as well.
+#export TOOLCHAIN_BIN="/usr/bin:/cygdrive/c/Program Files (x86)/Atollic/TrueSTUDIO for ARM Pro 2.3.0/ARMTools/bin"
+
+# This is the Cygwin path to the location where I build the buildroot
+# toolchain.
+# export TOOLCHAIN_BIN="${WD}/../misc/buildroot/build_arm_nofpu/staging_dir/bin"
+
+# Add the path to the toolchain to the PATH varialble
+export PATH="${TOOLCHAIN_BIN}:/sbin:/usr/sbin:${PATH_ORIG}"
+
+echo "PATH : ${PATH}"
@@ -0,0 +1,121 @@
+/****************************************************************************
+ * configs/samd30-xplained/scripts/flash.ld
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/* The ATSAMD20J18A has 256KB of FLASH beginning at address 0x0000:0000 and
+ * 64KB of SRAM beginning at address 0x2000:0000
+ */
+
+MEMORY
+{
+    flash (rx)  : ORIGIN = 0x00000000, LENGTH = 256K
+    sram  (rwx) : ORIGIN = 0x20000000, LENGTH = 64K
+}
+
+OUTPUT_ARCH(arm)
+ENTRY(_stext)
+SECTIONS
+{
+	.text : {
+		_stext = ABSOLUTE(.);
+		*(.vectors)
+		*(.text .text.*)
+		*(.fixup)
+		*(.gnu.warning)
+		*(.rodata .rodata.*)
+		*(.gnu.linkonce.t.*)
+		*(.glue_7)
+		*(.glue_7t)
+		*(.got)
+		*(.gcc_except_table)
+		*(.gnu.linkonce.r.*)
+		_etext = ABSOLUTE(.);
+	} > flash
+
+	.init_section : {
+		_sinit = ABSOLUTE(.);
+		*(.init_array .init_array.*)
+		_einit = ABSOLUTE(.);
+	} > flash
+
+	.ARM.extab : {
+		*(.ARM.extab*)
+	} >flash
+
+	__exidx_start = ABSOLUTE(.);
+	.ARM.exidx : {
+		*(.ARM.exidx*)
+	} >flash
+	__exidx_end = ABSOLUTE(.);
+
+	.data : {
+		_sdata = ABSOLUTE(.);
+		*(.data .data.*)
+		*(.gnu.linkonce.d.*)
+		CONSTRUCTORS
+		_edata = ABSOLUTE(.);
+	} > sram AT > flash
+
+	_eronly = LOADADDR(.data);
+
+	.ramfunc ALIGN(4): {
+		_sramfuncs = ABSOLUTE(.);
+		*(.ramfunc  .ramfunc.*)
+		_eramfuncs = ABSOLUTE(.);
+	} > sram AT > flash
+
+	_framfuncs = LOADADDR(.ramfunc);
+
+	.bss : {
+		_sbss = ABSOLUTE(.);
+		*(.bss .bss.*)
+		*(.gnu.linkonce.b.*)
+		*(COMMON)
+		_ebss = ABSOLUTE(.);
+	} > sram
+
+	/* Stabs debugging sections. */
+	.stab 0 : { *(.stab) }
+	.stabstr 0 : { *(.stabstr) }
+	.stab.excl 0 : { *(.stab.excl) }
+	.stab.exclstr 0 : { *(.stab.exclstr) }
+	.stab.index 0 : { *(.stab.index) }
+	.stab.indexstr 0 : { *(.stab.indexstr) }
+	.comment 0 : { *(.comment) }
+	.debug_abbrev 0 : { *(.debug_abbrev) }
+	.debug_info 0 : { *(.debug_info) }
+	.debug_line 0 : { *(.debug_line) }
+	.debug_pubnames 0 : { *(.debug_pubnames) }
+	.debug_aranges 0 : { *(.debug_aranges) }
+}
@@ -0,0 +1,2 @@
+/.depend
+/Make.dep
@@ -0,0 +1,122 @@
+############################################################################
+# configs/samd20-xplained/src/Makefile
+#
+#   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+-include $(TOPDIR)/Make.defs
+
+CFLAGS += -I$(TOPDIR)/sched
+
+ASRCS =
+AOBJS = $(ASRCS:.S=$(OBJEXT))
+
+CSRCS = sam_boot.c
+
+ifeq ($(CONFIG_HAVE_CXX),y)
+CSRCS += sam_cxxinitialize.c
+endif
+
+ifeq ($(CONFIG_SAMD_SPI0),y)
+CSRCS += sam_spi.c
+endif
+
+ifeq ($(CONFIG_ARCH_LEDS),y)
+CSRCS += sam_autoleds.c
+else
+CSRCS += sam_userleds.c
+endif
+
+ifeq ($(CONFIG_ARCH_BUTTONS),y)
+CSRCS += sam_buttons.c
+endif
+
+ifeq ($(CONFIG_NSH_ARCHINIT),y)
+CSRCS += sam_nsh.c
+endif
+
+ifeq ($(CONFIG_SAMD_SPI0),y)
+ifeq ($(CONFIG_SAM4L_XPLAINED_IOMODULE),y)
+CSRCS += sam_mmcsd.c
+endif
+endif
+
+ifeq ($(CONFIG_SAMD_SPI0),y)
+ifeq ($(CONFIG_SAM4L_XPLAINED_OLED1MODULE),y)
+ifeq ($(CONFIG_LCD_UG2832HSWEG04),y)
+CSRCS += sam_ug2832hsweg04.c
+endif
+endif
+endif
+
+COBJS = $(CSRCS:.c=$(OBJEXT))
+
+SRCS = $(ASRCS) $(CSRCS)
+OBJS = $(AOBJS) $(COBJS)
+
+ARCH_SRCDIR = $(TOPDIR)/arch/$(CONFIG_ARCH)/src
+ifeq ($(WINTOOL),y)
+  CFLAGS += -I "${shell cygpath -w $(ARCH_SRCDIR)/chip}"
+  CFLAGS += -I "${shell cygpath -w $(ARCH_SRCDIR)/common}"
+  CFLAGS += -I "${shell cygpath -w $(ARCH_SRCDIR)/armv7-m}"
+else
+  CFLAGS += -I$(ARCH_SRCDIR)/chip
+  CFLAGS += -I$(ARCH_SRCDIR)/common
+  CFLAGS += -I$(ARCH_SRCDIR)/armv7-m
+endif
+
+all: libboard$(LIBEXT)
+
+$(AOBJS): %$(OBJEXT): %.S
+	$(call ASSEMBLE, $<, $@)
+
+$(COBJS) $(LINKOBJS): %$(OBJEXT): %.c
+	$(call COMPILE, $<, $@)
+
+libboard$(LIBEXT): $(OBJS)
+	$(call ARCHIVE, $@, $(OBJS))
+
+.depend: Makefile $(SRCS)
+	$(Q) $(MKDEP) $(CC) -- $(CFLAGS) -- $(SRCS) >Make.dep
+	$(Q) touch $@
+
+depend: .depend
+
+clean:
+	$(call DELFILE, libboard$(LIBEXT))
+	$(call CLEAN)
+
+distclean: clean
+	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
+
+-include Make.dep
@@ -0,0 +1,177 @@
+/****************************************************************************
+ * configs/samd20-xplained/src/sam_autoleds.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+/* There are three LEDs on board the SAMD20 Xplained Pro board:  The EDBG
+ * controls two of the LEDs, a power LED and a status LED.  There is only
+ * one user controllable LED, a yellow LED labelled STATUS near the SAMD20 USB
+ * connector.
+ *
+ * This LED is controlled by PA14 and the LED can be activated by driving PA14
+ * to GND.
+ *
+ * When CONFIG_ARCH_LEDS is defined in the NuttX configuration, NuttX will
+ * control the LED as follows:
+ *
+ *   SYMBOL              Meaning                 LED
+ *   ------------------- ----------------------- ------
+ *   LED_STARTED         NuttX has been started  OFF
+ *   LED_HEAPALLOCATE    Heap has been allocated OFF
+ *   LED_IRQSENABLED     Interrupts enabled      OFF
+ *   LED_STACKCREATED    Idle stack created      ON
+ *   LED_INIRQ           In an interrupt**       N/C
+ *   LED_SIGNAL          In a signal handler***  N/C
+ *   LED_ASSERTION       An assertion failed     N/C
+ *   LED_PANIC           The system has crashed  FLASH
+ *
+ * Thus if the LED is statically on, NuttX has successfully  booted and is,
+ * apparently, running normally.  If the LED is flashing at approximately
+ * 2Hz, then a fatal error has been detected and the system has halted.
+ */
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <debug.h>
+
+#include <arch/board/board.h>
+
+#include "sam_gpio.h"
+#include "samd20-xplained.h"
+
+#ifdef CONFIG_ARCH_LEDS
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* CONFIG_DEBUG_LEDS enables debug output from this file (needs CONFIG_DEBUG
+ * with CONFIG_DEBUG_VERBOSE too)
+ */
+
+#ifdef CONFIG_DEBUG_LEDS
+#  define leddbg  lldbg
+#  define ledvdbg llvdbg
+#else
+#  define leddbg(x...)
+#  define ledvdbg(x...)
+#endif
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_led_initialize
+ ****************************************************************************/
+
+void board_led_initialize(void)
+{
+  (void)sam_configgpio(GPIO_STATUS_LED);
+}
+
+/****************************************************************************
+ * Name: board_led_on
+ ****************************************************************************/
+
+void board_led_on(int led)
+{
+  bool ledstate = true;
+
+  switch (led)
+    {
+    case 0:                   /* LED_STARTED:      NuttX has been started  STATUS LED=OFF */
+                              /* LED_HEAPALLOCATE: Heap has been allocated STATUS LED=OFF */
+                              /* LED_IRQSENABLED:  Interrupts enabled      STATUS LED=OFF */
+      break;                  /* Leave ledstate == true to turn OFF */
+
+    default:
+    case 2:                   /* LED_INIRQ:        In an interrupt         STATUS LED=N/C */
+                              /* LED_SIGNAL:       In a signal handler     STATUS LED=N/C */
+                              /* LED_ASSERTION:    An assertion failed     STATUS LED=N/C */
+      return;                 /* Return to leave STATUS LED unchanged */
+
+    case 3:                   /* LED_PANIC:        The system has crashed  STATUS LED=FLASH */
+    case 1:                   /* LED_STACKCREATED: Idle stack created      STATUS LED=ON */
+      ledstate = false;       /* Set ledstate == false to turn ON */
+      break;
+    }
+
+  sam_gpiowrite(GPIO_STATUS_LED, ledstate);
+}
+
+/****************************************************************************
+ * Name: board_led_off
+ ****************************************************************************/
+
+void board_led_off(int led)
+{
+  switch (led)
+    {
+    /* These should not happen and are ignored */
+
+    default:
+    case 0:                   /* LED_STARTED:      NuttX has been started  STATUS LED=OFF */
+                              /* LED_HEAPALLOCATE: Heap has been allocated STATUS LED=OFF */
+                              /* LED_IRQSENABLED:  Interrupts enabled      STATUS LED=OFF */
+    case 1:                   /* LED_STACKCREATED: Idle stack created      STATUS LED=ON */
+
+    /* These result in no-change */
+
+    case 2:                   /* LED_INIRQ:        In an interrupt         STATUS LED=N/C */
+                              /* LED_SIGNAL:       In a signal handler     STATUS LED=N/C */
+                              /* LED_ASSERTION:    An assertion failed     STATUS LED=N/C */
+      return;                 /* Return to leave STATUS LED unchanged */
+
+    /* Turn STATUS LED off set driving the output high */
+
+    case 3:                   /* LED_PANIC:        The system has crashed  STATUS LED=FLASH */
+      sam_gpiowrite(GPIO_STATUS_LED, true);
+      break;
+    }
+}
+
+#endif /* CONFIG_ARCH_LEDS */
@@ -0,0 +1,86 @@
+/************************************************************************************
+ * configs/samd20-xplained/src/sam_boot.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <debug.h>
+
+#include "samd20-xplained.h"
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: sam_boardinitialize
+ *
+ * Description:
+ *   All SAM3U architectures must provide the following entry point.  This entry point
+ *   is called early in the initialization -- after all memory has been configured
+ *   and mapped but before any devices have been initialized.
+ *
+ ************************************************************************************/
+
+void sam_boardinitialize(void)
+{
+  /* Configure SPI chip selects if 1) SPI is not disabled, and 2) the weak function
+   * sam_spiinitialize() has been brought into the link.
+   */
+
+#ifdef CONFIG_SAMD_SPI0
+  if (sam_spiinitialize)
+    {
+      sam_spiinitialize();
+    }
+#endif
+
+  /* Configure on-board LEDs if LED support has been selected. */
+
+#ifdef CONFIG_ARCH_LEDS
+  board_led_initialize();
+#endif
+}
@@ -0,0 +1,159 @@
+/****************************************************************************
+ * configs/samd20-xplained/src/sam_buttons.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/irq.h>
+
+#include <arch/irq.h>
+#include <arch/board/board.h>
+
+#include "sam_gpio.h"
+#include "samd20-xplained.h"
+
+#ifdef CONFIG_ARCH_BUTTONS
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+#if defined(CONFIG_GPIOA_IRQ) && defined(CONFIG_ARCH_IRQBUTTONS)
+static xcpt_t g_irqsw0;
+#endif
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_button_initialize
+ *
+ * Description:
+ *   board_button_initialize() must be called to initialize button resources.
+ *   After that, board_buttons() may be called to collect the current state of
+ *   all buttons or board_button_irq() may be called to register button
+ *   interrupt handlers.
+ *
+ ****************************************************************************/
+
+void board_button_initialize(void)
+{
+  (void)sam_configgpio(GPIO_SW0);
+}
+
+/************************************************************************************
+ * Name: board_buttons
+ *
+ * Description:
+ *   After board_button_initialize() has been called, board_buttons() may be called to collect
+ *   the state of all buttons.  board_buttons() returns an 8-bit bit set with each bit
+ *   associated with a button.  See the BUTTON* definitions above for the meaning of
+ *   each bit in the returned value.
+ *
+ ************************************************************************************/
+
+uint8_t board_buttons(void)
+{
+  return sam_gpioread(GPIO_SW0) ? 0 : BUTTON_SW0_BIT;
+}
+
+/****************************************************************************
+ * Name: board_button_irq
+ *
+ * Description:
+ *   This function may be called to register an interrupt handler that will
+ *   be called when a button is depressed or released.  The ID value is one
+ *   of the BUTTON* definitions provided above. The previous interrupt
+ *   handler address isreturned (so that it may restored, if so desired).
+ *
+ * Configuration Notes:
+ *   Configuration CONFIG_AVR32_GPIOIRQ must be selected to enable the
+ *   overall GPIO IRQ feature and CONFIG_AVR32_GPIOIRQSETA and/or
+ *   CONFIG_AVR32_GPIOIRQSETB must be enabled to select GPIOs to support
+ *   interrupts on.  For button support, bits 2 and 3 must be set in
+ *   CONFIG_AVR32_GPIOIRQSETB (PB2 and PB3).
+ *
+ ****************************************************************************/
+
+#if defined(CONFIG_GPIOA_IRQ) && defined(CONFIG_ARCH_IRQBUTTONS)
+xcpt_t board_button_irq(int id, xcpt_t irqhandler)
+{
+  xcpt_t oldhandler = NULL;
+
+  if (id == BUTTON_SW0)
+    {
+      irqstate_t flags;
+
+      /* Disable interrupts until we are done.  This guarantees that the
+       * following operations are atomic.
+       */
+
+      flags = irqsave();
+
+      /* Get the old button interrupt handler and save the new one */
+
+      oldhandler = *g_irqsw0;
+      *g_irqsw0 = irqhandler;
+
+      /* Configure the interrupt */
+
+      sam_gpioirq(IRQ_SW0);
+      (void)irq_attach(IRQ_SW0, irqhandler);
+      sam_gpioirqenable(IRQ_SW0);
+      irqrestore(flags);
+    }
+
+  /* Return the old button handler (so that it can be restored) */
+
+  return oldhandler;
+}
+#endif
+
+#endif /* CONFIG_ARCH_BUTTONS */
@@ -0,0 +1,153 @@
+/************************************************************************************
+ * configs/samd20-xplained/src/sam_cxxinitialize.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <debug.h>
+
+#include <nuttx/arch.h>
+
+#include <arch/samd/chip.h>
+#include "chip.h"
+
+#if defined(CONFIG_HAVE_CXX) && defined(CONFIG_HAVE_CXXINITIALIZE)
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+/* Debug ****************************************************************************/
+/* Non-standard debug that may be enabled just for testing the static constructors */
+
+#ifndef CONFIG_DEBUG
+#  undef CONFIG_DEBUG_CXX
+#endif
+
+#ifdef CONFIG_DEBUG_CXX
+#  define cxxdbg              dbg
+#  define cxxlldbg            lldbg
+#  ifdef CONFIG_DEBUG_VERBOSE
+#    define cxxvdbg           vdbg
+#    define cxxllvdbg         llvdbg
+#  else
+#    define cxxvdbg(x...)
+#    define cxxllvdbg(x...)
+#  endif
+#else
+#  define cxxdbg(x...)
+#  define cxxlldbg(x...)
+#  define cxxvdbg(x...)
+#  define cxxllvdbg(x...)
+#endif
+
+/************************************************************************************
+ * Private Types
+ ************************************************************************************/
+/* This type defines one entry in initialization array */
+
+typedef void (*initializer_t)(void);
+
+/************************************************************************************
+ * External references
+ ************************************************************************************/
+/* _sinit and _einit are symbols exported by the linker script that mark the
+ * beginning and the end of the C++ initialization section.
+ */
+
+extern initializer_t _sinit;
+extern initializer_t _einit;
+
+/* _stext and _etext are symbols exported by the linker script that mark the
+ * beginning and the end of text.
+ */
+
+extern uint32_t _stext;
+extern uint32_t _etext;
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/****************************************************************************
+ * Name: up_cxxinitialize
+ *
+ * Description:
+ *   If C++ and C++ static constructors are supported, then this function
+ *   must be provided by board-specific logic in order to perform
+ *   initialization of the static C++ class instances.
+ *
+ *   This function should then be called in the application-specific
+ *   user_start logic in order to perform the C++ initialization.  NOTE
+ *   that no component of the core NuttX RTOS logic is involved; This
+ *   function defintion only provides the 'contract' between application
+ *   specific C++ code and platform-specific toolchain support
+ *
+ ***************************************************************************/
+
+void up_cxxinitialize(void)
+{
+  initializer_t *initp;
+
+  cxxdbg("_sinit: %p _einit: %p _stext: %p _etext: %p\n",
+         &_sinit, &_einit, &_stext, &_etext);
+
+  /* Visit each entry in the initialzation table */
+
+  for (initp = &_sinit; initp != &_einit; initp++)
+    {
+      initializer_t initializer = *initp;
+      cxxdbg("initp: %p initializer: %p\n", initp, initializer);
+
+      /* Make sure that the address is non-NULL and lies in the text region
+       * defined by the linker script.  Some toolchains may put NULL values
+       * or counts in the initialization table
+       */
+
+      if ((void*)initializer > (void*)&_stext && (void*)initializer < (void*)&_etext)
+        {
+          cxxdbg("Calling %p\n", initializer);
+          initializer();
+        }
+    }
+}
+
+#endif /* CONFIG_HAVE_CXX && CONFIG_HAVE_CXXINITIALIZE */
@@ -0,0 +1,125 @@
+/****************************************************************************
+ * config/samd20-xplained/src/sam_mmcsd.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <debug.h>
+#include <errno.h>
+
+#include <nuttx/spi/spi.h>
+#include <nuttx/mmcsd.h>
+
+#include "samd20-xplained.h"
+
+#ifdef CONFIG_SAM4L_XPLAINED_IOMODULE
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+/* Configuration ************************************************************/
+
+#ifdef CONFIG_DISABLE_MOUNTPOINT
+#  error Mountpoints are disabled (CONFIG_DISABLE_MOUNTPOINT=y)
+#endif
+
+#ifndef CONFIG_SAMD_SPI0 /* REVISIT */
+#  error SPI support is required (CONFIG_SAMD_SPI0)
+#endif
+
+#ifndef CONFIG_MMCSD
+#  error MMC/SD support is required (CONFIG_MMCSD)
+#endif
+
+#define SAMD_MMCSDSLOTNO    0 /* There is only one slot */
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sam_sdinitialize
+ *
+ * Description:
+ *   Initialize the SPI-based SD card.  Requires
+ *   - CONFIG_SAM4L_XPLAINED_IOMODULE=y,
+ *   - CONFIG_DISABLE_MOUNTPOINT=n,
+ *   - CONFIG_MMCSD=y, and
+ *   - CONFIG_SAMD_SPI0=y
+ *
+ *****************************************************************************/
+
+int sam_sdinitialize(int minor)
+{
+  FAR struct spi_dev_s *spi;
+  int ret;
+
+  /* Get the SPI driver instance for the SD chip select */
+
+  fvdbg("Initializing SPI chip select %d\n", SD_CSNO);
+
+  spi = up_spiinitialize(SD_CSNO);
+  if (!spi)
+    {
+      fdbg("Failed to initialize SPI chip select %d\n", SD_CSNO);
+      return -ENODEV;
+    }
+
+  fvdbg("Successfully initialized SPI chip select %d\n", SD_CSNO);
+
+  /* Bind the SPI device for the chip select to the slot */
+
+  fvdbg("Binding SPI chip select %d to MMC/SD slot %d\n",
+          SD_CSNO, SAMD_MMCSDSLOTNO);
+
+  ret = mmcsd_spislotinitialize(minor, SAMD_MMCSDSLOTNO, spi);
+  if (ret < 0)
+    {
+      fdbg("Failed to bind SPI chip select %d to MMC/SD slot %d: %d\n",
+            SD_CSNO, SAMD_MMCSDSLOTNO, ret);
+      return ret;
+    }
+
+  fvdbg("Successfuly bound SPI chip select %d to MMC/SD slot %d\n",
+        SD_CSNO, SAMD_MMCSDSLOTNO);
+
+  return OK;
+}
+
+#endif /* CONFIG_SAM4L_XPLAINED_IOMODULE */
@@ -0,0 +1,117 @@
+/****************************************************************************
+ * config/samd20-xplained/src/sam_nsh.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <debug.h>
+
+#include "samd20-xplained.h"
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+#ifdef CONFIG_SAM4L_XPLAINED_IOMODULE
+/* Support for the SD card slot on the I/O1 module */
+/* Verify NSH PORT and SLOT settings */
+
+#  define SAMD_MMCSDSLOTNO    0 /* There is only one slot */
+
+#  if defined(CONFIG_NSH_MMCSDSLOTNO) && CONFIG_NSH_MMCSDSLOTNO != SAMD_MMCSDSLOTNO
+#    error Only one MMC/SD slot:  Slot 0 (CONFIG_NSH_MMCSDSLOTNO)
+#  endif
+
+#  if defined(CONFIG_NSH_MMCSDSPIPORTNO) && CONFIG_NSH_MMCSDSPIPORTNO != SD_CSNO
+#    error CONFIG_NSH_MMCSDSPIPORTNO must have the same value as SD_CSNO
+#  endif
+
+/* Default MMC/SD minor number */
+
+#  ifndef CONFIG_NSH_MMCSDMINOR
+#    define CONFIG_NSH_MMCSDMINOR 0
+#  endif
+#endif
+
+/* Debug ********************************************************************/
+
+#ifdef CONFIG_CPP_HAVE_VARARGS
+#  ifdef CONFIG_DEBUG
+#    define message(...) lowsyslog(__VA_ARGS__)
+#  else
+#    define message(...) printf(__VA_ARGS__)
+#  endif
+#else
+#  ifdef CONFIG_DEBUG
+#    define message lowsyslog
+#  else
+#    define message printf
+#  endif
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nsh_archinitialize
+ *
+ * Description:
+ *   Perform architecture specific initialization
+ *
+ ****************************************************************************/
+
+int nsh_archinitialize(void)
+{
+#if defined(CONFIG_SAMD_SPI0) && defined(CONFIG_SAM4L_XPLAINED_IOMODULE)
+  /* Initialize the SPI-based MMC/SD slot */
+
+  {
+    int ret = sam_sdinitialize(CONFIG_NSH_MMCSDMINOR);
+    if (ret < 0)
+      {
+        message("nsh_archinitialize: Failed to initialize MMC/SD slot: %d\n",
+                ret);
+       return ret;
+      }
+  }
+#endif
+
+  return OK;
+}
@@ -0,0 +1,283 @@
+/************************************************************************************
+ * configs/samd20-xplained/src/sam_spi.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <debug.h>
+#include <errno.h>
+
+#include <nuttx/spi/spi.h>
+
+#include "sam_gpio.h"
+#include "sam_spi.h"
+#include "samd20-xplained.h"
+
+#ifdef CONFIG_SAMD_SPI0 /* REVISIT */
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+/* Configuration ********************************************************************/
+
+#if defined(CONFIG_SAM4L_XPLAINED_IOMODULE) && \
+    defined(CONFIG_SAM4L_XPLAINED_OLED1MODULE) && defined(CONFIG_SPI_OWNBUS)
+#  error CONFIG_SPI_OWNBUS must not defined if using both I/O1 and OLED1 modules
+#endif
+
+/* Enables debug output from this file (needs CONFIG_DEBUG too) */
+
+#undef SPI_DEBUG   /* Define to enable debug */
+#undef SPI_VERBOSE /* Define to enable verbose debug */
+
+#ifdef SPI_DEBUG
+#  define spidbg  lldbg
+#  ifdef SPI_VERBOSE
+#    define spivdbg lldbg
+#  else
+#    define spivdbg(x...)
+#  endif
+#else
+#  undef SPI_VERBOSE
+#  define spidbg(x...)
+#  define spivdbg(x...)
+#endif
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: sam_spiinitialize
+ *
+ * Description:
+ *   Called to configure SPI chip select GPIO pins for the SAM3U10E-EVAL board.
+ *
+ ************************************************************************************/
+
+void weak_function sam_spiinitialize(void)
+{
+  /* The I/O module containing the SD connector may or may not be installed.  And, if
+   * it is installed, it may be in connector EXT1 or EXT2.
+   */
+
+#ifdef CONFIG_SAM4L_XPLAINED_IOMODULE
+  /* TODO: enable interrupt on card detect */
+
+   sam_configgpio(GPIO_SD_CD);     /* Card detect input */
+   sam_configgpio(GPIO_SD_CS);     /* Chip select output */
+#endif
+
+#ifdef CONFIG_SAM4L_XPLAINED_OLED1MODULE
+   sam_configgpio(GPIO_OLED_DATA); /* Command/data */
+   sam_configgpio(GPIO_OLED_CS);   /* Card detect input */
+#endif
+}
+
+/****************************************************************************
+ * Name:  sam_spiselect, sam_spistatus, and sam_spicmddata
+ *
+ * Description:
+ *   These external functions must be provided by board-specific logic.  They
+ *   include:
+ *
+ *   o sam_spiselect is a functions tomanage the board-specific chip selects
+ *   o sam_spistatus and sam_spicmddata:  Implementations of the status
+ *     and cmddata methods of the SPI interface defined by struct spi_ops_
+ *     (see include/nuttx/spi/spi.h). All other methods including
+ *     up_spiinitialize()) are provided by common SAM3/4 logic.
+ *
+ *  To use this common SPI logic on your board:
+ *
+ *   1. Provide logic in sam_boardinitialize() to configure SPI chip select
+ *      pins.
+ *   2. Provide sam_spiselect() and sam_spistatus() functions in your board-
+ *      specific logic.  These functions will perform chip selection and
+ *      status operations using GPIOs in the way your board is configured.
+ *   2. If CONFIG_SPI_CMDDATA is defined in the NuttX configuration, provide
+ *      sam_spicmddata() functions in your board-specific logic.  This
+ *      function will perform cmd/data selection operations using GPIOs in
+ *      the way your board is configured.
+ *   3. Add a call to up_spiinitialize() in your low level application
+ *      initialization logic
+ *   4. The handle returned by up_spiinitialize() may then be used to bind the
+ *      SPI driver to higher level logic (e.g., calling
+ *      mmcsd_spislotinitialize(), for example, will bind the SPI driver to
+ *      the SPI MMC/SD driver).
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sam_spiselect
+ *
+ * Description:
+ *   PIO chip select pins may be programmed by the board specific logic in
+ *   one of two different ways.  First, the pins may be programmed as SPI
+ *   peripherals.  In that case, the pins are completely controlled by the
+ *   SPI driver.  This method still needs to be provided, but it may be only
+ *   a stub.
+ *
+ *   An alternative way to program the PIO chip select pins is as a normal
+ *   GPIO output.  In that case, the automatic control of the CS pins is
+ *   bypassed and this function must provide control of the chip select.
+ *   NOTE:  In this case, the GPIO output pin does *not* have to be the
+ *   same as the NPCS pin normal associated with the chip select number.
+ *
+ * Input Parameters:
+ *   devid - Identifies the (logical) device
+ *   selected - TRUE:Select the device, FALSE:De-select the device
+ *
+ * Returned Values:
+ *   None
+ *
+ ****************************************************************************/
+
+void sam_spiselect(enum spi_dev_e devid, bool selected)
+{
+#ifdef CONFIG_SAM4L_XPLAINED_IOMODULE
+  /* Select/de-select the SD card */
+
+  if (devid == SPIDEV_MMCSD)
+    {
+      /* Active low */
+
+      sam_gpiowrite(GPIO_SD_CS, !selected);
+    }
+
+#ifdef CONFIG_SAM4L_XPLAINED_OLED1MODULE
+  else
+#endif
+#endif
+
+#ifdef CONFIG_SAM4L_XPLAINED_OLED1MODULE
+  /* Select/de-select the OLED */
+
+  if (devid == SPIDEV_DISPLAY)
+    {
+      /* Active low */
+
+      sam_gpiowrite(GPIO_OLED_CS, !selected);
+    }
+#endif
+}
+
+/****************************************************************************
+ * Name: sam_spistatus
+ *
+ * Description:
+ *   Return status information associated with the SPI device.
+ *
+ * Input Parameters:
+ *   devid - Identifies the (logical) device
+ *
+ * Returned Values:
+ *   Bit-encoded SPI status (see include/nuttx/spi/spi.h.
+ *
+ ****************************************************************************/
+
+uint8_t sam_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
+{
+  uint8_t ret = 0;
+
+#ifdef CONFIG_SAM4L_XPLAINED_IOMODULE
+  /* Check if an SD card is present in the microSD slot */
+
+  if (devid == SPIDEV_MMCSD)
+    {
+      /* Active low */
+
+      if (!sam_gpioread(GPIO_SD_CD))
+        {
+          ret |= SPI_STATUS_PRESENT;
+        }
+    }
+#endif
+
+  return ret;
+}
+
+#endif /* CONFIG_SAMD_SPI0 */
+
+/****************************************************************************
+ * Name: sam_spicmddata
+ *
+ * Description:
+ *   Some SPI devices require an additional control to determine if the SPI
+ *   data being sent is a command or is data.  If CONFIG_SPI_CMDDATA then
+ *   this function will be called to different be command and data transfers.
+ *
+ *   This is often needed, for example, by LCD drivers.  Some LCD hardware
+ *   may be configured to use 9-bit data transfers with the 9th bit
+ *   indicating command or data.  That same hardware may be configurable,
+ *   instead, to use 8-bit data but to require an additional, board-
+ *   specific GPIO control to distinguish command and data.  This function
+ *   would be needed in that latter case.
+ *
+ * Input Parameters:
+ *   dev - SPI device info
+ *   devid - Identifies the (logical) device
+ *
+ * Returned Values:
+ *   Zero on success; a negated errno on failure.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SPI_CMDDATA
+int sam_spicmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd)
+{
+#ifdef CONFIG_SAM4L_XPLAINED_OLED1MODULE
+  if (devid == SPIDEV_DISPLAY)
+    {
+      /* This is the Data/Command control pad which determines whether the
+       * data bits are data or a command.
+       *
+       * High: the inputs are treated as display data.
+       * Low:  the inputs are transferred to the command registers.
+       */
+
+      (void)sam_gpiowrite(GPIO_OLED_DATA, !cmd);
+    }
+#endif
+      return OK;
+}
+#endif
@@ -0,0 +1,211 @@
+/****************************************************************************
+ * config/samd20-xplained/src/sam_ug2832hsweg04.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/* OLED1 Connector:
+ *
+ *  OLED1 CONNECTOR
+ *  ----------------- ---------------------- ----------------------
+ *  OLED1             EXT1                   EXT2
+ *  ----------------- ---------------------- ----------------------
+ *  1  ID             1                      1
+ *  ----------------- ---------------------- ----------------------
+ *  2  GND            2       GND            2  GND
+ *  ----------------- ---------------------- ----------------------
+ *  3  BUTTON2        3  PB00 AIN[8]         3  PA10 AIN[18]
+ *  ----------------- ---------------------- ----------------------
+ *  4  BUTTON3        4  PB01 AIN[9]         4  PA11 AIN[19]
+ *  ----------------- ---------------------- ----------------------
+ *  5  DATA_CMD_SEL   5  PB06 GPIO           5  PA20 GPIO
+ *  ----------------- ---------------------- ----------------------
+ *  6  LED3           6  PB07 GPIO           6  PA21 GPIO
+ *  ----------------- ---------------------- ----------------------
+ *  7  LED1           7  PB02 TC6/WO[0]      7  PA22 TC4/WO[0]
+ *  ----------------- ---------------------- ----------------------
+ *  8  LED2           8  PB03 TC6/WO[1]      8  PA23 TC4/WO[1]
+ *  ----------------- ---------------------- ----------------------
+ *  9  BUTTON1        9  PB04 EXTINT[4]      9  PB14 EXTINT[14]
+ *  ----------------- ---------------------- ----------------------
+ *  10 DISPLAY_RESET  10 PB05 GPIO           10 PB15 GPIO
+ *  ----------------- ---------------------- ----------------------
+ *  11 N/C            11 PA08 SERCOM2 PAD[0] 11 PA08 SERCOM2 PAD[0]
+ *                            I²C SDA                I²C SDA
+ *  ----------------- ---------------------- ----------------------
+ *  12 N/C            12 PA09 SERCOM2 PAD[1] 12 PA09 SERCOM2 PAD[1]
+ *                            I²C SCL                I²C SCL
+ *  ----------------- ---------------------- ----------------------
+ *  13 N/C            13 PB09 SERCOM4 PAD[1] 13 PB13 SERCOM4 PAD[1]
+ *                            UART RX                UART RX
+ *  ----------------- ---------------------- ----------------------
+ *  14 N/C            14 PB08 SERCOM4 PAD[0] 14 PB12 SERCOM4 PAD[0]
+ *                            UART TX                UART TX
+ *  ----------------- ---------------------- ----------------------
+ *  15 DISPLAY_SS     15 PA05 SERCOM0 PAD[1] 15 PA17 SERCOM1 PAD[1]
+ *                            SPI SS                 SPI SS
+ *  ----------------- ---------------------- ----------------------
+ *  16 SPI_MOSI       16 PA06 SERCOM0 PAD[2] 16 PA18 SERCOM1 PAD[2]
+ *                            SPI MOSI               SPI MOSI
+ *  ----------------- ---------------------- ----------------------
+ *  17 N/C            17 PA04 SERCOM0 PAD[0] 17 PA16 SERCOM1 PAD[0]
+ *                            SPI MISO               SPI MISO
+ *  ----------------- ---------------------- ----------------------
+ *  18 SPI_SCK        18 PA07 SERCOM0 PAD[3] 18 PA19 SERCOM1 PAD[3]
+ *                            SPI SCK                SPI SCK 
+ *  ----------------- ---------------------- ----------------------
+ *  19 GND            19      GND               GND
+ *  ----------------- ---------------------- ----------------------
+ *  20 VCC            20      VCC               VCC
+ *  ----------------- ---------------------- ----------------------
+ *
+ * OLED1 signals
+ *
+ * DATA_CMD_SEL - Data/command select. Used to choose whether the
+ *   communication is data to the display memory or a command to the LCD
+ *   controller. High = data, low = command
+ * DISPLAY_RESET - Reset signal to the OLED display, active low. Used during
+ *   initialization of the display.
+ * DISPLAY_SS - SPI slave select signal, must be held low during SPI
+ *   communication.
+ * SPI_MOSI - SPI master out, slave in signal. Used to write data to the
+ *   display
+ * SPI_SCK SPI - clock signal, generated by the master.
+ */
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <debug.h>
+
+#include <nuttx/spi/spi.h>
+#include <nuttx/lcd/lcd.h>
+#include <nuttx/lcd/ssd1306.h>
+
+#include "sam_gpio.h"
+#include "samd20-xplained.h"
+
+#ifdef CONFIG_SAM4L_XPLAINED_OLED1MODULE
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+/* Configuration ************************************************************/
+/* The pin configurations here require that SPI1 is selected */
+
+#ifndef CONFIG_LCD_SSD1306
+#  error "The OLED driver requires CONFIG_LCD_SSD1306 in the configuration"
+#endif
+
+#ifndef CONFIG_LCD_UG2832HSWEG04
+#  error "The OLED driver requires CONFIG_LCD_UG2832HSWEG04 in the configuration"
+#endif
+
+#ifndef CONFIG_SAMD_SPI0
+#  error "The OLED driver requires CONFIG_SAMD_SPI0 in the configuration"
+#endif
+
+#ifndef CONFIG_SPI_CMDDATA
+#  error "The OLED driver requires CONFIG_SPI_CMDDATA in the configuration"
+#endif
+
+/* Debug ********************************************************************/
+
+#ifdef CONFIG_DEBUG_LCD
+#  define lcddbg(format, arg...)   dbg(format, ##arg)
+#  define lcdvdbg(format, arg...)  vdbg(format, ##arg)
+#else
+#  define lcddbg(x...)
+#  define lcdvdbg(x...)
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_nxdrvinit
+ *
+ * Description:
+ *   Called by NX initialization logic to configure the OLED.
+ *
+ ****************************************************************************/
+
+FAR struct lcd_dev_s *up_nxdrvinit(unsigned int devno)
+{
+  FAR struct spi_dev_s *spi;
+  FAR struct lcd_dev_s *dev;
+
+  /* Configure the OLED GPIOs. This initial configuration is RESET low,
+   * putting the OLED into reset state.
+   */
+ 
+  (void)sam_configgpio(GPIO_OLED_RST);
+
+  /* Wait a bit then release the OLED from the reset state */
+
+  up_mdelay(20);
+  sam_gpiowrite(GPIO_OLED_RST, true);
+
+  /* Get the SPI1 port interface */
+
+  spi = up_spiinitialize(OLED_CSNO);
+  if (!spi)
+    {
+      lcddbg("Failed to initialize SPI port 1\n");
+    }
+  else
+    {
+      /* Bind the SPI port to the OLED */
+
+      dev = ssd1306_initialize(spi, devno);
+      if (!dev)
+        {
+          lcddbg("Failed to bind SPI port 1 to OLED %d: %d\n", devno);
+        }
+     else
+        {
+          lcdvdbg("Bound SPI port 1 to OLED %d\n", devno);
+
+          /* And turn the OLED on */
+
+          (void)dev->setpower(dev, CONFIG_LCD_MAXPOWER);
+          return dev;
+        }
+    }
+
+  return NULL;
+}
+#endif /* CONFIG_SAM4L_XPLAINED_OLED1MODULE */
@@ -0,0 +1,142 @@
+/****************************************************************************
+ * configs/samd20-xplained/src/sam_userleds.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+/* There are three LEDs on board the SAMD20 Xplained Pro board:  The EDBG
+ * controls two of the LEDs, a power LED and a status LED.  There is only
+ * one user controllable LED, a yellow LED labeled STATUS near the SAMD20 USB
+ * connector.
+ *
+ * This LED is controlled by PA14 and the LED can be activated by driving PA14
+ * to GND.
+ *
+ * When CONFIG_ARCH_LEDS is defined in the NuttX configuration, NuttX will
+ * control the LED.  Otherwise, the LED can be controlled from user applications
+ * using the logic in this file.
+ */
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <debug.h>
+
+#include <arch/board/board.h>
+
+#include "sam_gpio.h"
+#include "samd20-xplained.h"
+
+#ifndef CONFIG_ARCH_LEDS
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* CONFIG_DEBUG_LEDS enables debug output from this file (needs CONFIG_DEBUG
+ * with CONFIG_DEBUG_VERBOSE too)
+ */
+
+#ifdef CONFIG_DEBUG_LEDS
+#  define leddbg  lldbg
+#  define ledvdbg llvdbg
+#else
+#  define leddbg(x...)
+#  define ledvdbg(x...)
+#endif
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sam_ledinit
+ *
+ * Description:
+ *   If CONFIG_ARCH_LEDS is defined, then NuttX will control the on-board
+ *   LEDs.  If CONFIG_ARCH_LEDS is not defined, then the sam_ledinit() is
+ *   available to initialize the LED from user application logic.
+ *
+ ****************************************************************************/
+
+void sam_ledinit(void)
+{
+  (void)sam_configgpio(GPIO_STATUS_LED);
+}
+
+/****************************************************************************
+ * Name: sam_setled
+ *
+ * Description:
+ *   If CONFIG_ARCH_LEDS is defined, then NuttX will control the on-board
+ *  LEDs.  If CONFIG_ARCH_LEDS is not defined, then the sam_setled() is
+ *  available to control the LED from user application logic.
+ *
+ *****************************************************************************/
+
+void sam_setled(int led, bool ledon)
+{
+  if (led == BOARD_STATUS_LED)
+    {
+      sam_gpiowrite(GPIO_STATUS_LED, !ledon);
+    }
+}
+
+/****************************************************************************
+ * Name: sam_setled
+ *
+ * Description:
+ *   If CONFIG_ARCH_LEDS is defined, then NuttX will control the on-board
+ *  LEDs.  If CONFIG_ARCH_LEDS is not defined, then the sam_setleds() is
+ *  available to control the LED from user application logic.  NOTE:  since
+ *  there is only a single LED on-board, this is function is not very useful.
+ *
+ *****************************************************************************/
+
+void sam_setleds(uint8_t ledset)
+{
+  sam_setled(BOARD_STATUS_LED, (ledset & BOARD_STATUS_LED_BIT) != 0);
+}
+
+#endif /* !CONFIG_ARCH_LEDS */
@@ -0,0 +1,277 @@
+/************************************************************************************
+ * configs/samd20-xplained/src/samd20-xplained.h
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+#ifndef __CONFIGS_SAMD20_XPLAINED_SRC_SAMD20_XPLAINED_H
+#define __CONFIGS_SAMD20_XPLAINED_SRC_SAMD20_XPLAINED_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <stdint.h>
+
+#include <arch/irq.h>
+#include <nuttx/irq.h>
+
+#include "chip/sam_pinmap.h"
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+/* LEDs: There are three LEDs on board the SAMD20 Xplained Pro board:  The EDBG
+ * controls two of the LEDs, a power LED and a status LED.  There is only
+ * one user controllable LED, a yellow LED labelled STATIS near the SAMD20 USB
+ * connector.
+ *
+ * This LED is controlled by PA14 and the LED can be activated by driving PA14
+ * to GND.
+ *
+ * When CONFIG_ARCH_LEDS is defined in the NuttX configuration, NuttX will
+ * control the LED as follows:
+ *
+ *   SYMBOL              Meaning                 LED
+ *   ------------------- ----------------------- ------
+ *   LED_STARTED         NuttX has been started  OFF
+ *   LED_HEAPALLOCATE    Heap has been allocated OFF
+ *   LED_IRQSENABLED     Interrupts enabled      OFF
+ *   LED_STACKCREATED    Idle stack created      ON
+ *   LED_INIRQ           In an interrupt         N/C
+ *   LED_SIGNAL          In a signal handler     N/C
+ *   LED_ASSERTION       An assertion failed     N/C
+ *   LED_PANIC           The system has crashed  FLASH
+ *
+ * Thus if the LED is statically on, NuttX has successfully  booted and is,
+ * apparently, running normally.  If the LED is flashing at approximately
+ * 2Hz, then a fatal error has been detected and the system has halted.
+ */
+
+#define GPIO_STATUS_LED (GPIO_OUTPUT | GPIO_PULL_NONE | GPIO_OUTPUT_SET | \
+                         GPIO_PORTA | GPIO_PIN14)
+
+/* Mechanical buttons:
+ *
+ * The SAMD20 Xplained Pro contains two mechanical buttons. One button is the
+ * RESET button connected to the SAMD20 reset line and the other is a generic user
+ * configurable button. When a button is pressed it will drive the I/O line to GND.
+ *
+ *   PA15 SW0
+ */
+
+#define GPIO_SW0      (GPIO_INTERRUPT | GPIO_PULL_UP | GPIO_GLITCH_FILTER | \
+                       GPIO_PORTA | GPIO_PIN15)
+#define IRQ_SW0       SAM_IRQ_PA15
+
+/* I/O1
+ *
+ * Support for the microSD card slot on the I/O1 module.  The I/O1 requires
+ * SPI support and two GPIOs.    These the GPIOs will vary if the I/O1
+ * is installed on the EXT1 or EXT2 connector:
+ *
+ *   --- ------------------ ---------------------- -------------------------------
+ *   PIN EXT1               EXT2                   Description
+ *   --- ------------------ ---------------------- -------------------------------
+ *   15 PA05 SERCOM0 PAD[1] 15 PA17 SERCOM1 PAD[1]  Active low chip select OUTPUT,
+ *           SPI SS                 SPI SS          pulled high on board.
+ *   --- ------------------ ---------------------- -------------------------------
+ *   10 PB05 GPIO           10 PB15 GPIO            Active low card detect INPUT,
+ *                                                  must use internal pull-up.
+ *   --- ------------------ ---------------------- -------------------------------
+ */
+
+#ifdef CONFIG_SAMD20_XPLAINED_IOMODULE
+
+#  ifndef CONFIG_SAMD_SPI0
+#    error CONFIG_SAMD_SPI0 is required to use the I/O1 module
+#  endif
+
+#  if defined(CONFIG_SAMD20_XPLAINED_IOMODULE_EXT1)
+
+#    if defined(CONFIG_SAMD20_XPLAINED_OLED1MODULE) && \
+        defined(CONFIG_SAMD20_XPLAINED_OLED1MODULE_EXT1)
+#      error I/O1 and OLED1 modules cannot both reside in EXT1
+#    endif
+
+#    define GPIO_SD_CD (GPIO_INTERRUPT | GPIO_INT_CHANGE | GPIO_PULL_UP | \
+                        GPIO_GLITCH_FILTER | GPIO_PORTF | GPIO_PIN5)
+#    define IRQ_SD_CD   SAM_IRQ_PB5
+
+#    define GPIO_SD_CS (GPIO_OUTPUT | GPIO_PULL_NONE | GPIO_OUTPUT_SET | \
+                        GPIO_PORTA | GPIO_PIN5)
+#    define SD_CSNO    0
+
+#  elif defined(CONFIG_SAMD20_XPLAINED_IOMODULE_EXT2)
+
+#    if defined(CONFIG_SAMD20_XPLAINED_OLED1MODULE) && \
+        defined(CONFIG_SAMD20_XPLAINED_OLED1MODULE_EXT2)
+#      error I/O1 and OLED1 modules cannot both reside in EXT2
+#    endif
+
+#    define GPIO_CD   (GPIO_INTERRUPT | GPIO_INT_CHANGE | GPIO_PULL_UP | \
+                       GPIO_GLITCH_FILTER | GPIO_PORTB | GPIO_PIN15)
+#    define IRQ_CD     SAM_IRQ_PB15
+
+#    define GPIO_SD_CS (GPIO_OUTPUT | GPIO_PULL_NONE | GPIO_OUTPUT_SET | \
+                        GPIO_PORTA | GPIO_PIN17)
+#    define SD_CSNO    2
+
+#  else
+#    error Which connector is the I/O1 module installed in?
+#  endif
+#endif
+
+/* OLED1
+ *
+ * Support for the microSD card slot on the I/O1 module.  The I/O1 requires
+ * SPI support and three output GPIOs.  These the GPIOs will vary if the OLED1
+ * is installed on the EXT1 or EXT2 connector:
+ *
+ *
+ *   PIN EXT1                EXT2                 Description
+ *   --- ------------------- -------------------- -------------------------------------
+ *   5   PB06 GPIO           PA20 GPIO            DATA_CMD_SEL
+ *   10  PB05 GPIO           PB15 GPIO            DISPLAY_RESET. Active low.
+ *   15  PA05 SERCOM0 PAD[1] PA17 SERCOM1 PAD[1]  DISPLAY_SS.  Active low.
+ *            SPI SS              SPI SS
+ */
+
+#ifdef CONFIG_SAMD20_XPLAINED_OLED1MODULE
+
+#  ifndef CONFIG_SAMD_SPI0 /* REVISIT */
+#    error CONFIG_SAMD_SPI0 is required to use the OLED1 module
+#  endif
+
+#  ifndef CONFIG_SPI_CMDDATA
+#    error CONFIG_SPI_CMDDATA is required to use the OLED1 module
+#  endif
+
+#  ifndef CONFIG_LCD_SSD1306
+#    error CONFIG_LCD_SSD1306 is required to use the OLED1 module
+#  endif
+
+#  ifndef CONFIG_LCD_UG2832HSWEG04
+#    error CONFIG_LCD_UG2832HSWEG04 is required to use the OLED1 module
+#  endif
+
+#  if defined(CONFIG_SAMD20_XPLAINED_OLED1MODULE_EXT1)
+
+#    if defined(CONFIG_SAMD20_XPLAINED_IOMODULE) && \
+        defined(CONFIG_SAMD20_XPLAINED_IOMODULE_EXT1)
+#      error OLED1 and I/O1 modules cannot both reside in EXT1
+#    endif
+
+#    define GPIO_OLED_DATA (GPIO_OUTPUT | GPIO_PULL_NONE | GPIO_OUTPUT_CLEAR | \
+                            GPIO_PORTB | GPIO_PIN6)
+#    define GPIO_OLED_RST  (GPIO_OUTPUT | GPIO_PULL_NONE | GPIO_OUTPUT_CLEAR | \
+                            GPIO_PORTB | GPIO_PIN5)
+#    define GPIO_OLED_CS   (GPIO_OUTPUT | GPIO_PULL_NONE | GPIO_OUTPUT_SET | \
+                            GPIO_PORTA | GPIO_PIN5)
+#    define OLED_CSNO       0
+
+#  elif defined(CONFIG_SAMD20_XPLAINED_OLED1MODULE_EXT2)
+
+#    if defined(CONFIG_SAMD20_XPLAINED_IOMODULE) && \
+        defined(CONFIG_SAMD20_XPLAINED_IOMODULE_EXT2)
+#      error OLED1 and I/O1 modules cannot both reside in EXT2
+#    endif
+
+#    define GPIO_OLED_DATA (GPIO_OUTPUT | GPIO_PULL_NONE | GPIO_OUTPUT_CLEAR | \
+                            GPIO_PORTA | GPIO_PIN20)
+#    define GPIO_OLED_RST  (GPIO_OUTPUT | GPIO_PULL_NONE | GPIO_OUTPUT_CLEAR | \
+                            GPIO_PORTB | GPIO_PIN15)
+#    define GPIO_OLED_CS   (GPIO_OUTPUT | GPIO_PULL_NONE | GPIO_OUTPUT_SET | \
+                            GPIO_PORTA | GPIO_PIN17)
+#    define OLED_CSNO      2
+
+#  else
+#    error Which connector is the OLED1 module installed in?
+#  endif
+#endif
+
+#if defined(CONFIG_LCD_UG2864AMBAG01) || defined(CONFIG_LCD_UG2864HSWEG01)
+#    define GPIO_SD_CS (GPIO_OUTPUT | GPIO_PULL_NONE | GPIO_OUTPUT_SET | \
+                        GPIO_PORTB | GPIO_PIN11) /* REVISIT */
+#endif
+
+/************************************************************************************
+ * Public Types
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public data
+ ************************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: sam_spiinitialize
+ *
+ * Description:
+ *   Called to configure SPI chip select GPIO pins for the SAM3U-EK board.
+ *
+ ************************************************************************************/
+
+void weak_function sam_spiinitialize(void);
+
+/************************************************************************************
+ * Name: sam_sdinitialize
+ *
+ * Description:
+ *   Initialize the SPI-based SD card.  Requires CONFIG_SAMD20_XPLAINED_IOMODULE=y,
+ *   CONFIG_DISABLE_MOUNTPOINT=n, CONFIG_MMCSD=y, and CONFIG_SAMD_SPI0=y
+ *
+ ************************************************************************************/
+
+#if defined(CONFIG_SAMD_SPI0) && defined(CONFIG_SAMD20_XPLAINED_IOMODULE)
+int sam_sdinitialize(int minor);
+#endif
+
+/************************************************************************************
+ * Name: board_led_initialize
+ ************************************************************************************/
+
+#ifdef CONFIG_ARCH_LEDS
+void board_led_initialize(void);
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* __CONFIGS_SAMD20_XPLAINED_SRC_SAMD20_XPLAINED_H */
+