#if CONFIG_FREERTOS_UNICORE
static const BaseType_t app_cpu = 0;
#else
static const BaseType_t app_cpu = 1;
#endif

// global variables
volatile uint16_t delay_time = 150;

// pins
static const uint8_t pin_led = 32;

// task
static TaskHandle_t task_blinky = NULL;

void blinky_led (void* parameter);
void uart_set_speed (void* parameter);

void setup () {
  Serial.begin(115200);
  pinMode(pin_led, OUTPUT);

  vTaskDelay(1000 / portTICK_PERIOD_MS);
  Serial.println("set blink delay (ms): ");

  xTaskCreatePinnedToCore(blinky_led, "blinky_led0", 1024, NULL, 2, &task_blinky, app_cpu);
  xTaskCreatePinnedToCore(uart_set_speed, "uart_set_speed0", 1024, NULL, 1, NULL, app_cpu);

  vTaskDelete(NULL);
}

void loop () {}

void blinky_led (void* parameter) {
  while (1) {
    digitalWrite(pin_led, digitalRead(pin_led)^1);
    vTaskDelay(delay_time / portTICK_PERIOD_MS);
  }
}

void uart_set_speed (void *parameter) {
  while (1) {
    if (Serial.available() > 0) {
      // vTaskSuspend(task_blinky);

      String data = Serial.readString();
      Serial.print("(read) ");
      Serial.println(data);

      delay_time = data.toInt();
      // vTaskResume(task_blinky);
    }
  }
}