boards/xtensa/esp32: Add LED support for

Heltec WiFi LoRa 32 board

This commit adds the User LED driver support for the Heltec WiFi LoRa 32
board. It implements the lower-half driver, maps the onboard white LED
to GPIO 25, and adds the necessary build system and initialization logic.

Signed-off-by: Shriyans Sahoo <shriyans.s.sahoo@gmail.com>

Author: Shriyans406

boards/xtensa/esp32/heltec_wifi_lora32/include/board.h

@@ -48,6 +48,7 @@
 /* Define how many LEDs this board has (needed by userleds) */
 
 #define BOARD_NLEDS       1
+#define GPIO_LED1         25 /* White LED on Heltec WiFi LoRa 32 */
 
 /* GPIO pins used by the GPIO Subsystem */
 

boards/xtensa/esp32/heltec_wifi_lora32/src/Make.defs

@@ -34,3 +34,8 @@ DEPPATH += --dep-path board
 VPATH += :board
 CFLAGS += ${INCDIR_PREFIX}$(TOPDIR)$(DELIM)arch$(DELIM)$(CONFIG_ARCH)$(DELIM)src$(DELIM)board$(DELIM)board
 
+
+ifeq ($(CONFIG_USERLED),y)
+CSRCS += esp32_userleds.c
+endif
+

boards/xtensa/esp32/heltec_wifi_lora32/src/esp32_bringup.c

@@ -38,6 +38,12 @@
 
 #include "esp32_start.h"
 
+#ifdef CONFIG_USERLED
+#  include <nuttx/leds/userled.h>
+#endif
+
+
+
 #ifdef CONFIG_ESPRESSIF_HR_TIMER
 #  include "espressif/esp_hr_timer.h"
 #endif
@@ -110,6 +116,16 @@ int esp32_bringup(void)
    * capabilities.
    */
 
+
+#ifdef CONFIG_USERLED
+  ret = userled_lower_initialize("/dev/userleds");
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: userled_lower_initialize() failed: %d\n", ret);
+    }
+#endif
+
+
   UNUSED(ret);
   return OK;
 }

boards/xtensa/esp32/heltec_wifi_lora32/src/esp32_userleds.c

@@ -0,0 +1,44 @@
+/****************************************************************************
+ * boards/xtensa/esp32/heltec_wifi_lora32/src/esp32_userleds.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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.
+ ****************************************************************************
+ */
+
+#include <nuttx/config.h>
+#include <stdbool.h>
+#include <nuttx/board.h>
+#include <arch/board/board.h>
+#include "espressif/esp_gpio.h"
+#include "heltec_wifi_lora32.h"
+
+static const uint32_t g_ledcfg[BOARD_NLEDS] = { GPIO_LED1 };
+
+uint32_t board_userled_initialize(void)
+{
+  for (int i = 0; i < BOARD_NLEDS; i++)
+    {
+      esp_configgpio(g_ledcfg[i], OUTPUT);
+    }
+  return BOARD_NLEDS;
+}
+
+void board_userled(int led, bool ledon)
+{
+  if ((unsigned)led < BOARD_NLEDS)
+    {
+      esp_gpiowrite(g_ledcfg[led], ledon);
+    }
+}
+
+void board_userled_all(uint32_t ledset)
+{
+  for (int i = 0; i < BOARD_NLEDS; i++)
+    {
+      esp_gpiowrite(g_ledcfg[i], (ledset & (1 << i)) != 0);
+    }
+}