part4

part4_inputs_outputs/lab2_pwm/main.c

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+/****************************************************************************
+ * Copyright (C) 2021 by Fabrice Muller                                     *
+ *                                                                          *
+ * This file is useful for ESP32 Design course.                             *
+ *                                                                          *
+ ****************************************************************************/
+
+/**
+ * @file main.c
+ * @author Fabrice Muller
+ * @date 02 Nov. 2021
+ * @brief File containing the lab2 of Part 4.
+ *
+ * @see https://github.com/fmuller-pns/esp32-vscode-project-template
+ */
+
+#include <stdio.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "driver/ledc.h"
+#include "esp_err.h"
+
+#include "soc/ledc_reg.h"
+
+
+/*
+Documentation:
+https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/ledc.html
+
+*/
+
+/**
+ * @brief Starting point function
+ * 
+ */
+void app_main(void) {
+
+  /* 
+   * LEDC Timer configuration
+   * Timer 0, Low speed mode, Auto clk, Résolution 10bits, Frequency 5 KHz
+   */
+  ledc_timer_config_t timer = {
+      .speed_mode = LEDC_LOW_SPEED_MODE,
+      .duty_resolution = LEDC_TIMER_10_BIT,
+      .timer_num = LEDC_TIMER_0,
+      .freq_hz = 5000,
+      .clk_cfg = LEDC_AUTO_CLK};
+
+  ledc_timer_config(&timer);
+
+  /*
+   * Channel configuration
+   * Timer 0, Channel 0, GPIO21 pin, Low speed mode, duty=0
+   */
+  ledc_channel_config_t channel = {
+      .gpio_num = 21,
+      .speed_mode = LEDC_LOW_SPEED_MODE,
+      .channel = LEDC_CHANNEL_0,  
+      .timer_sel = LEDC_TIMER_0,
+      .duty = 0,    
+      .hpoint = 0
+      };
+
+  ledc_channel_config(&channel);
+
+  /* Fade installation */
+  esp_err_t result = ledc_fade_func_install(0);
+  if (result != ESP_OK) {
+    printf("Error installing fade: %04x\n", result);  
+    return;
+  }
+
+  /* First scenario */
+  printf("First scenario\n");
+
+  for (int i = 0; i < 1024; i++) {
+    ledc_set_duty_and_update(LEDC_LOW_SPEED_MODE,LEDC_CHANNEL_0,i,0);
+    vTaskDelay(pdMS_TO_TICKS(10));
+  }
+
+  /* Second scenario */
+  printf("Second scenario\n");
+
+  while(true) {
+    printf("Action 1\n");
+    ledc_set_fade_time_and_start(LEDC_LOW_SPEED_MODE,LEDC_CHANNEL_0, 0, 2000, LEDC_FADE_WAIT_DONE);
+
+    printf("Action 2\n");
+    ledc_set_fade_time_and_start(LEDC_LOW_SPEED_MODE,LEDC_CHANNEL_0, 1024, 5000, LEDC_FADE_WAIT_DONE);
+  }
+
+}