ESP32: esp32-freertos-03-solution-led.ino

#include <Arduino.h>

/**
 * Solution to 02 - Blinky Challenge
 * 
 * Toggles LED at different rates using separate tasks.
 * 
 * Date: December 3, 2020
 * Author: Shawn Hymel
 * License: 0BSD
 */

// Use only core 1 for demo purposes
#if CONFIG_FREERTOS_UNICORE
static const BaseType_t app_cpu = 0;
#else
static const BaseType_t app_cpu = 1;
#endif

// LED rates
static const int rate_1 = 3000;  // ms
static const int rate_2 = 1000;  // ms

// Pins
//#define LED_BUILTIN 17 // BLUE LED kidbright
//#define LED_BUILTIN 15 // YELLOW LED kidbright
//#define LED_BUILTIN 12 // GREEN LED kidbright
//#define LED_BUILTIN 2  // RED LED kidbright
//#define LED_BUILTIN 14 // PIN 14 Buzzer kidbright
#define LED_BUILTIN 12

static const int led_pin = LED_BUILTIN;

// Our task: blink an LED at one rate
void toggleLED_1(void *parameter) {
  while(1) {
    digitalWrite(led_pin, HIGH);
    vTaskDelay(rate_1 / portTICK_PERIOD_MS);
    digitalWrite(led_pin, LOW);
    vTaskDelay(rate_1 / portTICK_PERIOD_MS);
  }
}

// Our task: blink an LED at another rate
void toggleLED_2(void *parameter) {
  while(1) {
    digitalWrite(led_pin, HIGH);
    vTaskDelay(rate_2 / portTICK_PERIOD_MS);
    digitalWrite(led_pin, LOW);
    vTaskDelay(rate_2 / portTICK_PERIOD_MS);
  }
}

void setup() {

  // Configure pin
  pinMode(led_pin, OUTPUT);

  // Task to run forever
  xTaskCreatePinnedToCore(  // Use xTaskCreate() in vanilla FreeRTOS
              toggleLED_1,  // Function to be called
              "Toggle 1",   // Name of task
              1024,         // Stack size (bytes in ESP32, words in FreeRTOS)
              NULL,         // Parameter to pass to function
              1,            // Task priority (0 to configMAX_PRIORITIES - 1)
              NULL,         // Task handle
              app_cpu);     // Run on one core for demo purposes (ESP32 only)

  // Task to run forever
  xTaskCreatePinnedToCore(  // Use xTaskCreate() in vanilla FreeRTOS
              toggleLED_2,  // Function to be called
              "Toggle 2",   // Name of task
              1024,         // Stack size (bytes in ESP32, words in FreeRTOS)
              NULL,         // Parameter to pass to function
              1,            // Task priority (0 to configMAX_PRIORITIES - 1)
              NULL,         // Task handle
              app_cpu);     // Run on one core for demo purposes (ESP32 only)

  // If this was vanilla FreeRTOS, you'd want to call vTaskStartScheduler() in
  // main after setting up your tasks.
}

void loop() {
  // Do nothing
  // setup() and loop() run in their own task with priority 1 in core 1
  // on ESP32
}