Hello to all. I have GUI task that it's main purpose to redraw windows and to react on pressing buttons. So I thought that the best way redraw window every 200 miliseconds (vTaskDelay(200)), and also I want to call it from Keyboard Interrupt. I redraw window periodicly, because the data on it can be changed. So, I can't use vTaskSuspend.

Help me, please, how can i do this ? Thanks in advance Valerie

I think, may be, the gui task after redraw window will set itself to suspend state. And resume it from timer every 200 mili and from the keyboard interrupt. ???

If I will run the gui Task in loop with Delay(200) , how can I break the DELAING state from keyboard interrupt ?

From a task you can use http://www.freertos.org/xTaskAbortDelay.html but I'm not sure if there is a FromISR version.

I'd recoment to use semaphore with Delay option instead of vTaskDelay. If you need to interrupt, just give a semaphore.

Hi Dave, thanks for your answer. But I really don't see FromISR version. How I can check if it is right solution for my problem ?

Hi, Rasty. Can you, please, give me an example of your solution. If I understand right, the gui task take semaphore in the end of it's loop.. In keyboard interrupt I can give semaphore back. What about call gui task every 200 mili ? Return semaphore from timer ?

Can you explain your solution again ?

I hope that I understand correcly the problem. You have to redraw screen each 200 ms. Sometimes trigger extra redraw from Interrupt or other context.

while (1) { xSemaphoreTake(sem, 200); // will leave xSemaphoreTake after 200 msecs (with error) or earlier if sem is given. redraw(); }

from other task/interrupt xSemaphoreGive(sem)

Thanks a lot to you, Rasty

You can also do the same thing in a more efficient way using a direct to task notification in place of a semaphore.

http://www.freertos.org/RTOSTaskNotificationAsCounting_Semaphore.html

thank you very much