DevHeads IoT Integration Server•17mo ago

How to Implement a 6-Hour Delay in FreeRTOS Task?

I would like to know if i can do vtaskdelay of a period of 6 hours, what is the way to do it.
I have a task I wanted to be excuted eeach 6 hours whats is the best way to do it .?

Thanks

Solution

@youcef_ali

vTaskDelay

vTaskDelay

takes the delay period in ticks, you need to convert the 6 hours into ticks based on your system's tick rate. Normally, u'll are to multiply the number of seconds in 6hours with your ticks per second which would result in a very high number and using large value isn't ideal so a better approach would be using a loop i.e

(this is assuming ur tick is 1000/sec)

#define HOUR_TICKS (3600000)  // 1 hour in ticks

void vTaskFunction(void *pvParameters)
{
    for (;;)
    {
        // Perform your task here
        
   
        for (int i = 0; i < 6; i++)
        {
            vTaskDelay(HOUR_TICKS);
        }
    }
}

#define HOUR_TICKS (3600000)  // 1 hour in ticks

void vTaskFunction(void *pvParameters)
{
    for (;;)
    {
        // Perform your task here
        
   
        for (int i = 0; i < 6; i++)
        {
            vTaskDelay(HOUR_TICKS);
        }
    }
}

Jump to solution

Solution

Enthernet CodeAPP•8/6/24, 3:40 PM

@youcef_ali

vTaskDelay

vTaskDelay

(this is assuming ur tick is 1000/sec)

#define HOUR_TICKS (3600000)  // 1 hour in ticks

void vTaskFunction(void *pvParameters)
{
    for (;;)
    {
        // Perform your task here
        
   
        for (int i = 0; i < 6; i++)
        {
            vTaskDelay(HOUR_TICKS);
        }
    }
}

#define HOUR_TICKS (3600000)  // 1 hour in ticks

void vTaskFunction(void *pvParameters)
{
    for (;;)
    {
        // Perform your task here
        
   
        for (int i = 0; i < 6; i++)
        {
            vTaskDelay(HOUR_TICKS);
        }
    }
}

youcef_aliAPP•8/6/24, 3:42 PM

thank you, what do you see the best approach using a task with delay or a timer ?

Enthernet CodeAPP•8/6/24, 3:42 PM

Timer as it has high precision and doesn't consume much resources thuo it might be hard to setup thuo

Jean Labrosse•9/1/24, 5:41 PM

Why the loop? Assuming a 32-bit int, why not (6 * HOUR_TICKS)??

That being said, a 6 Hour delay might not be the best use for a task! … but if you do use a task, i assume it’s a very low priority one (i.e.) just higher than the idle task.

I would prefer having a way to check that the task is still running, right now, it it’s not, you have to wait 6 hours or more to find out.