I recently purchased an inexpensive ESP32-S3-DevKitC-1-N32R8 development board. That’s an ESP32-S3 board with an ESP32-S3-WROOM-2, 32MB of FLASH and 8MB of SPIRAM. In one particular experiment I wanted to work with the ESP-IDF libraries for accessing the FLASH and SPIRAM. So far those attempts have failed in spite of trying to follow the demo code provided in the ESP-IDF. I’m currently using version 4.4.2 of ESP-IDF.

What I have done is create a project that allows me to get something running, then add features to a working project. This is the baseline project I’ve created, yet another RGB LED flasher. This one is written in C++ and uses C++ tuples to create a collection (vector) of colors to display on the RGB LED. I wanted something similar to what I do in MicroPython, where I create a Python collection and simply iterate over the collection of colors (see line 44). In the past when trying something similar in standard C I always had to know the size of my array/vector. With C++14, I can simply define my vector of colors, and then use the C++’s for-each construct to iterate over the vector of color tuples.

Finally, I should note that the RGB LED is on GPIO38. I used idf.py menuconfig to set the GPIO pen.

#include <vector>#include <tuple>#include "freertos/FreeRTOS.h"#include "freertos/task.h"#include "driver/gpio.h"#include "esp_log.h"#include "led_strip.h"#include "sdkconfig.h"static const char *TAG = "ESP32-S3-N32R8 Work Example";static const uint8_t BLINK_GPIO = CONFIG_BLINK_GPIO;static led_strip_t *pStrip_a;typedef std::tuple<int, int, int, int> led_color;static const std::vector <led_color> colors {{0,32,0,0},  // red{0,0,32,0},  // green{0,0,0,32},  // blue{0,0,32,32}, // cyan{0,32,0,32}, // magenta{0,32,16,0}, // yellow{0,0,0,0}// black};static void cycle_rgb_led_colors(void) {for(auto c : colors) {pStrip_a->set_pixel(pStrip_a,std::get<0>(c), std::get<1>(c), std::get<2>(c), std::get<3>(c));pStrip_a->refresh(pStrip_a, 100);vTaskDelay(900 / portTICK_PERIOD_MS);// Turn RGB LED off by clearing all its individual LEDs.//pStrip_a->clear(pStrip_a, 50);vTaskDelay(100 / portTICK_PERIOD_MS);}}static void configure_rgb_led(void) {// LED strip initialization with the GPIO and pixels number.pStrip_a = led_strip_init(CONFIG_BLINK_LED_RMT_CHANNEL, BLINK_GPIO, 1);// Clear all LEDs in RGB LED to turn it off.pStrip_a->clear(pStrip_a, 50);}extern "C" void app_main(void) {configure_rgb_led();ESP_LOGI(TAG, "Cycle RGB LED Colours.");while (true) {cycle_rgb_led_colors();}}