/*
  程序：  使用Task Notification来取代Binary Semaphore

  API:  
  xTaskNotifyGive  // 相当于精简化的 xTaskNotify() + eIncrement
  ulTaskNotifyTake //  waitting for notification, then reset to 0

  公众号：孤独的二进制

*/

TaskHandle_t xflashLED = NULL;

void flashLED(void *pvParam) {
  uint32_t ulNotificationValue;
  pinMode(23, OUTPUT);
  while (1) {
    //返回运行此命令之前的Notification Value
    //命令含义: waitting for notification, then reset
    ulNotificationValue = ulTaskNotifyTake(pdTRUE, //pdTRUE 运行完后，清零
                                           portMAX_DELAY);

    if ( ulNotificationValue > 0 )
    {
      digitalWrite(23, !digitalRead(23));
      vTaskDelay(1000);
    }
  }
}

void readBtn(void *pvParam) {

  pinMode(22, INPUT_PULLUP);

  while (1) {
    if (digitalRead(22) == LOW) {
      //命令含义，相当于精简化的 xTaskNotify() + eIncrement
      xTaskNotifyGive(xflashLED);
      vTaskDelay(120); //button debounce
    }
  }
}


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

  xTaskCreate(flashLED, "Flash LED", 1024 * 4, NULL, 1, &xflashLED);
  xTaskCreate(readBtn, "Read Button", 1024 * 4, NULL, 1, NULL);

}

void loop() {
}