configs/stm32f103-minimum: Add Nunchuck board support for stm32f103-minimum board

configs/stm32f103-minimum/README.txt

@@ -12,6 +12,7 @@ Contents
   - UARTs
   - Timer Inputs/Outputs
   - Using 128KiB of Flash instead of 64KiB
+  - Nintendo Wii Nunchuck
   - Quadrature Encoder
   - SDCard support
   - SPI NOR Flash
@@ -245,6 +246,39 @@ Using 128KiB of Flash instead of 64KiB
 
   Now NuttX should start normally.
 
+Nintendo Wii Nunchuck:
+======================
+
+  There is a driver on NuttX to support Nintendo Wii Nunchuck Joystick. If you
+  want to use it please select these options:
+
+  - Enable the I2C1 at System Type -> STM32 Peripheral Support, it will enable:
+
+    CONFIG_STM32_I2C1=y
+
+  - Enable to Custom board/driver initialization at RTOS Features -> RTOS hooks
+
+    CONFIG_BOARD_INITIALIZE=y
+
+  - Enable the I2C Driver Support at Device Drivers, it will enable this symbol:
+
+    CONFIG_I2C=y
+
+  - Nintendo Wii Nunchuck Joystick at Device Drivers -> [*] Input Device Support
+
+    CONFIG_INPUT=y
+      CONFIG_INPUT_NUNCHUCK=y
+
+  - Enable the Nunchuck joystick example at Application Configuration -> Examples
+
+  CONFIG_EXAMPLES_NUNCHUCK=y
+    CONFIG_EXAMPLES_NUNCHUCK_DEVNAME="/dev/nunchuck0"
+
+  You need to connect GND and +3.3V pins from Nunchuck connector to GND and 3.3V
+  of stm32f103-minimum respectively (Nunchuck also can work connected to 5V, but
+  I don't recommend it). Connect I2C Clock from Nunchuck to SCK (PB6) and the
+  I2C Data to SDA (PB7).
+
 Quadrature Encoder:
 ===================
 

configs/stm32f103-minimum/src/Makefile

@@ -105,6 +105,10 @@ ifeq ($(CONFIG_LCD_MAX7219),y)
   CSRCS += stm32_max7219.c
 endif
 
+ifeq ($(CONFIG_INPUT_NUNCHUCK),y)
+  CSRCS += stm32_nunchuck.c
+endif
+
 ifeq ($(CONFIG_LCD_ST7567),y)
   CSRCS += stm32_lcd.c
 endif

configs/stm32f103-minimum/src/stm32_bringup.c

@@ -284,6 +284,16 @@ int stm32_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_INPUT_NUNCHUCK
+  /* Register the Nunchuck driver */
+
+  ret = nunchuck_initialize("/dev/nunchuck0");
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: nunchuck_initialize() failed: %d\n", ret);
+    }
+#endif
+
 #ifdef CONFIG_SENSORS_QENCODER
   /* Initialize and register the qencoder driver */
 

configs/stm32f103-minimum/src/stm32_nunchuck.c

@@ -0,0 +1,99 @@
+/****************************************************************************
+ * configs/stm32f4discovery/src/stm32_nunchuck.c
+ *
+ *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
+ *   Author: Alan Carvalho de Assis <acassis@gmail.com>
+ *
+ * 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 <fcntl.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/irq.h>
+#include <nuttx/arch.h>
+#include <nuttx/fs/fs.h>
+#include <nuttx/input/nunchuck.h>
+
+#include "stm32_i2c.h"
+#include "stm32f103_minimum.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define NUNCHUCK_I2C_PORTNO 1   /* On I2C1 */
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nunchuck_initialize
+ *
+ * Description:
+ *   Initialize and register the Nunchuck joystick driver
+ *
+ ****************************************************************************/
+
+int nunchuck_initialize(FAR char *devname)
+{
+  FAR struct i2c_master_s *i2c;
+  int ret;
+
+  iinfo("Initializing Wii Nunchuck!\n");
+
+  /* Initialize I2C */
+
+  i2c = stm32_i2cbus_initialize(NUNCHUCK_I2C_PORTNO);
+  if (i2c == NULL)
+    {
+      return -ENODEV;
+    }
+
+  /* Register the joystick device as /dev/nunchuck0 */
+
+  iinfo("Initialize joystick driver: %s\n", devname);
+
+  ret = nunchuck_register(devname, i2c);
+  if (ret < 0)
+    {
+      ierr("ERROR: nunchuck_register failed: %d\n", ret);
+    }
+
+  return ret;
+}

configs/stm32f103-minimum/src/stm32f103_minimum.h

@@ -241,6 +241,18 @@ void stm32_spidev_initialize(void);
 int stm32_mmcsd_initialize(int minor);
 #endif
 
+/****************************************************************************
+ * Name: nunchuck_initialize
+ *
+ * Description:
+ *   Initialize and register the button joystick driver
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_INPUT_NUNCHUCK
+int nunchuck_initialize(FAR char *devname);
+#endif
+
 /************************************************************************************
  * Name: stm32_hcsr04_initialize
  *