Hello,

I am working on a project in IDF with FreeRTOS. Among all the tasks, the project has one task that needs to run every day at midnight (00:00 UTC). To do this, I have an external RTC with which I calculate how many seconds are left until midnight (I have verified that the calculation is correct). From there, I convert it to milliseconds and calculate the number of ticks to wait using pdMS_TO_TICKS(), passing this tick number to vTaskDelay(). However, the task runs much earlier. Does anyone know why this might be? The Tick rate (Hz) is 1000.

On the other hand, I have verified that when I convert X milliseconds to ticks using pdMS_TO_TICKS() and then calculate how many milliseconds those ticks are with pdTICKS_TO_MS(), the milliseconds value does not match the initial one. Does anyone know why this might be? Here's an example:

43200 seconds to milliseconds: 43200000
43200 seconds to ticks: 250327 
43200000 milliseconds to ticks: 250327 
250327 ticks to milliseconds: 250327

Thank you very much in advance.

Hello,

I am currently working on a project that uses FreeRTOS to create a bunch of tasks to do things. The code was written be a former student and I have to implement some stuff and make it run a bit smoother but I can't really understand the FreeRTOS part especially when it comes to Delays and TaskDelays or someone also told me about yields.

As an example I have 2 Tasks:

  xTaskCreatePinnedToCore(
    Task1code, /* Function to implement the task */
    "Pubblish", /* Name of the task */
    8192,  /* Stack size in words */
    NULL,  /* Task input parameter */
    1,  /* Priority of the task */
    &Task1,  /* Task handle. */
    1);
    
  delay(100);
  xTaskCreatePinnedToCore(
    Task2Code, /* Function to implement the task */
    "Sensors", /* Name of the task */
    4096,  /* Stack size in words */
    NULL,  /* Task input parameter */
    2,  /* Priority of the task */
    &Task2,  /* Task handle. */
    1);

and the following functions :

void Task1code( void * parameter) {
  
  for (;;) {
    if (client.connected()) { 
      String temp = getData();
      vTaskDelay(800);
  
      if (!client.publish("topic", temp ())) {
        log_e("Couldnt publish to 'Topic' ");
        vTaskDelay(200);
      } 
    }
    delay(3000);
  }
}

void Task2code( void * parameter) {
  for (;;){
    getTempValue(); // reads some DS81B0 temperaturesensors over 1-wire
    delay(750);
  }
}

I am kind of unsure what vTaskDelay does in the first code as I cant really understand this page here https://www.freertos.org/a00127.html - Also, can I use normal delays in a extra task or is it bad ?

I would love if someone could explains me the vTaskDelay a bit more noob-friendly and maybe has some ideas on how to make that code run better ?

Edit:

Also I question would be is how to use vTaskDelayUntil()

Thanks !