I created three tasks with 1ms, 5ms and 10ms Priorities 1st scenario : 1ms - 1st task has highest priority 5ms - 2nd Priority 10ms - 3rd priority Tasks aren’t switching after 1ms task, only 1ms task is running and remaining tasks aren’t running 2nd scenario: I kept all the tasks as same prio…

what do your tasks do? show us your code.

void addTask(void *pvParameters) { TickType_t lastWakeTime; const TickType_t xFrequency = pdMS_TO_TICKS(1); lastWakeTime = xTaskGetTickCount(); while (1) { vTaskDelayUntil(&lastWakeTime, xFrequency); result3 = add_variable - 5; add_variable--; // vTaskDelay(pdMS_TO_TICK…

change your delay period in your first task from 1 to 2.

I didn’t get your point @RAc My requirement is to trigger tasks at 1ms , 5ms and 10 ms next iteration 1ms ,5ms and 10ms so on.

[image] Quesion about the function vTaskDelay() Kernel vTaskDelay(1) will delay the task until the next tick occurs, which might be just moments later, or might be up to the full period of a tick. vTaskDelay(2) will delay the task until 2 tick occur, if the first one occu…

If Use vTaskDelay(2) , 1tick is equal to 1ms, so , 2ticks it means 2ms, my task executing at 2ms not at 1ms.

do read Richrd’s explantion. Nothing to add.

@varma Welcome to FreeRTOS Community Forums Regarding your first scenario, if the 1 ms task has the highest priority and calls vTaskDelay(pdMS_TO_TICKS(1)), the scheduler moves it to the blocked state for 1ms (which is equal to 1 tick as you mentioned). When the next tick interrupt occurs, the 1 m…

One big thing to note is that vTaskDelayUntil has a significant difference from vTaskDelay, in that vTaskDelay measures from “now”, (or at least the beginning of the current tick) while vTaskDelayUntil measures from the last time the task was scheduled to wake. This means that a loop with vTaskDelay…

Detailed explanation here - Tick Resolution - FreeRTOS™ .

Tasks aren't switching

Kernel

RAc April 17, 2025, 11:11am 6

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Tasks aren't switching

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