esp32s2/rmt: Use the Espressif's common RMT driver.

This commit use the new common RMT driver for all Espressif's
xtensa-based chips on ESP32-S2.

boards/xtensa/esp32s2/common/include/esp32s2_board_rmt.h

@@ -0,0 +1,97 @@
+/****************************************************************************
+ * boards/xtensa/esp32s2/common/include/esp32s2_board_rmt.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __BOARDS_XTENSA_ESP32S2_COMMON_INCLUDE_ESP32S2_BOARD_RMT_H
+#define __BOARDS_XTENSA_ESP32S2_COMMON_INCLUDE_ESP32S2_BOARD_RMT_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef CONFIG_ESP_RMT
+
+/****************************************************************************
+ * Name: board_rmt_rxinitialize
+ *
+ * Description:
+ *   Initialize the RMT peripheral and register a RX device.
+ *
+ * Input Parameters:
+ *   ch  - the RMT's channel that will be used
+ *   pin - The pin used for the RX channel
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int board_rmt_rxinitialize(int ch, int pin);
+
+/****************************************************************************
+ * Name: board_rmt_txinitialize
+ *
+ * Description:
+ *   Initialize the RMT peripheral and register a TX device.
+ *
+ * Input Parameters:
+ *   ch  - the RMT's channel that will be used
+ *   pin - The pin used for the TX channel
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int board_rmt_txinitialize(int ch, int pin);
+
+#endif /* CONFIG_ESP_RMT */
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* __BOARDS_XTENSA_ESP32S2_COMMON_INCLUDE_ESP32S2_BOARD_RMT_H */

boards/xtensa/esp32s2/common/src/Make.defs

@@ -68,6 +68,10 @@ ifeq ($(CONFIG_AUDIO_ES8311),y)
   CSRCS += esp32s2_es8311.c
 endif
 
+ifeq ($(CONFIG_ESP_RMT),y)
+  CSRCS += esp32s2_board_rmt.c
+endif
+
 DEPPATH += --dep-path src
 VPATH += :src
 CFLAGS += ${INCDIR_PREFIX}$(TOPDIR)$(DELIM)arch$(DELIM)$(CONFIG_ARCH)$(DELIM)src$(DELIM)board$(DELIM)src

boards/xtensa/esp32s2/common/src/esp32s2_board_rmt.c

@@ -0,0 +1,152 @@
+/****************************************************************************
+ * boards/xtensa/esp32s2/common/src/esp32s2_board_rmt.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <errno.h>
+#include <debug.h>
+#include <stdio.h>
+
+#include "xtensa.h"
+
+#include <nuttx/kmalloc.h>
+#include <nuttx/rmt/rmtchar.h>
+#ifdef CONFIG_WS2812_NON_SPI_DRIVER
+#include <nuttx/leds/ws2812.h>
+
+#include "espressif/esp_ws2812.h"
+#endif
+
+#include "espressif/esp_rmt.h"
+
+#ifdef CONFIG_ESP_RMT
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_rmt_rxinitialize
+ *
+ * Description:
+ *   Initialize the RMT peripheral and register a RX device.
+ *
+ * Input Parameters:
+ *   ch  - the RMT's channel that will be used
+ *   pin - The pin used for the RX channel
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int board_rmt_rxinitialize(int ch, int pin)
+{
+  int ret;
+
+  struct rmt_dev_s *rmt = esp_rmt_rx_init(ch, pin);
+
+  ret = rmtchar_register(rmt);
+  if (ret < 0)
+    {
+      rmterr("ERROR: rmtchar_register failed: %d\n", ret);
+      return ret;
+    }
+
+  return ret;
+}
+
+/****************************************************************************
+ * Name: board_rmt_txinitialize
+ *
+ * Description:
+ *   Initialize the RMT peripheral and register a TX device.
+ *
+ * Input Parameters:
+ *   ch  - the RMT's channel that will be used
+ *   pin - The pin used for the TX channel
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int board_rmt_txinitialize(int ch, int pin)
+{
+  int ret;
+  struct rmt_dev_s *rmt;
+#ifdef CONFIG_WS2812_NON_SPI_DRIVER
+  struct ws2812_dev_s *led;
+#endif
+
+  rmt = esp_rmt_tx_init(ch, pin);
+  if (rmt == NULL)
+    {
+      rmterr("ERROR: esp_rmt_tx_init failed\n");
+      return -ENODEV;
+    }
+
+  ret = rmtchar_register(rmt);
+  if (ret < 0)
+    {
+      rmterr("ERROR: rmtchar_register failed: %d\n", ret);
+      return ret;
+    }
+
+#ifdef CONFIG_WS2812_NON_SPI_DRIVER
+  led = esp_ws2812_setup("/dev/leds0", rmt, CONFIG_WS2812_LED_COUNT, false);
+  if (led == NULL)
+    {
+      rmterr("ERROR: esp_ws2812_setup failed\n");
+      return -ENODEV;
+    }
+#endif
+
+  return ret;
+}
+#endif

boards/xtensa/esp32s2/esp32s2-saola-1/configs/rmt/defconfig

@@ -0,0 +1,58 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+# CONFIG_ARCH_LEDS is not set
+# CONFIG_ASSERTIONS_FILENAME is not set
+# CONFIG_NDEBUG is not set
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+CONFIG_ARCH="xtensa"
+CONFIG_ARCH_BOARD="esp32s2-saola-1"
+CONFIG_ARCH_BOARD_COMMON=y
+CONFIG_ARCH_BOARD_ESP32S2_SAOLA_1=y
+CONFIG_ARCH_CHIP="esp32s2"
+CONFIG_ARCH_CHIP_ESP32S2=y
+CONFIG_ARCH_CHIP_ESP32S2WROVER=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_ARCH_XTENSA=y
+CONFIG_BOARD_LOOPSPERMSEC=16717
+CONFIG_BUILTIN=y
+CONFIG_ESP32S2_UART0=y
+CONFIG_ESP_RMT=y
+CONFIG_EXAMPLES_RMTCHAR=y
+CONFIG_EXAMPLES_RMTCHAR_RX=y
+CONFIG_EXAMPLES_RMTCHAR_TX=y
+CONFIG_EXAMPLES_WS2812=y
+CONFIG_FS_PROCFS=y
+CONFIG_HAVE_CXX=y
+CONFIG_HAVE_CXXINITIALIZE=y
+CONFIG_IDLETHREAD_STACKSIZE=3072
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INIT_STACKSIZE=3072
+CONFIG_INTELHEX_BINARY=y
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_LINELEN=64
+CONFIG_NSH_READLINE=y
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_RAM_SIZE=114688
+CONFIG_RAM_START=0x20000000
+CONFIG_RMT=y
+CONFIG_RMTCHAR=y
+CONFIG_RMT_DEFAULT_RX_BUFFER_SIZE=256
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_START_DAY=6
+CONFIG_START_MONTH=12
+CONFIG_START_YEAR=2011
+CONFIG_SYSLOG_BUFFER=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_UART0_SERIAL_CONSOLE=y
+CONFIG_WS2812=y
+CONFIG_WS2812_LED_COUNT=100
+CONFIG_WS2812_NON_SPI_DRIVER=y

boards/xtensa/esp32s2/esp32s2-saola-1/src/esp32s2-saola-1.h

@@ -51,6 +51,19 @@
 #define ONESHOT_TIMER         TIMER0
 #define ONESHOT_RESOLUTION_US 1
 
+/* RMT gpio */
+
+#define RMT_RXCHANNEL       1
+#define RMT_TXCHANNEL       0
+
+#ifdef CONFIG_RMT_LOOP_TEST_MODE
+#  define RMT_INPUT_PIN       0
+#  define RMT_OUTPUT_PIN      0
+#else
+#  define RMT_INPUT_PIN       2
+#  define RMT_OUTPUT_PIN      4
+#endif
+
 /****************************************************************************
  * Public Types
  ****************************************************************************/

boards/xtensa/esp32s2/esp32s2-saola-1/src/esp32s2_bringup.c

@@ -88,6 +88,10 @@
 #  include "esp32s2_rtc_lowerhalf.h"
 #endif
 
+#ifdef CONFIG_ESP_RMT
+#  include "esp32s2_board_rmt.h"
+#endif
+
 #include "esp32s2-saola-1.h"
 
 /****************************************************************************
@@ -362,6 +366,20 @@ int esp32s2_bringup(void)
 
 #endif /* CONFIG_ESP32S2_I2S */
 
+#ifdef CONFIG_ESP_RMT
+  ret = board_rmt_txinitialize(RMT_TXCHANNEL, RMT_OUTPUT_PIN);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: board_rmt_txinitialize() failed: %d\n", ret);
+    }
+
+  ret = board_rmt_rxinitialize(RMT_RXCHANNEL, RMT_INPUT_PIN);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: board_rmt_txinitialize() failed: %d\n", ret);
+    }
+#endif
+
 #ifdef CONFIG_RTC_DRIVER
   /* Instantiate the ESP32 RTC driver */