FreeRTOSV7.4.0 Atmega32 running only one task

shoeb-avr wrote on Saturday, April 13, 2013:


I have created a couple of tasks to blink some LED’s connected to output port of Atmega32. I am using STK500.

But I am able to run only one task. I am not sure the other task is even getting created. I checked with several stack sizes from minimal to 500 bytes for each task. Still does not help. I do not have any debugger to check the code at run time I am using AvrStudio 4.14 for development.

Appreciate all your help thanks…

davedoors wrote on Saturday, April 13, 2013:

Check the return value of xTaskCreate() to know if the task is being created, and invest in a debugger. I think you can run the code in the AVR simulator without a debugger.

shoeb-avr wrote on Wednesday, April 17, 2013:

Thanks for replying,

I will be doing that. I checked with creating on only one task and it does what it is supposed to do.

Task 1 by itself toggles the LED’s as it should. Task 2 by itself toggles as it should.

But when I want to create both of them only of them is created. I am not able to understand if I am overflowing the stack or is there something to do with the interrupts? Or am I missing any macro that I should configure before compiling.


shoeb-avr wrote on Sunday, April 21, 2013:


Both the tasks are created I verified using Simulation in AvrStudio debugger. But only one of them is running. The low priority task. Please help. The high priority task never seems to be executed.

rtel wrote on Monday, April 22, 2013:

Please first check that your tick interrupt is executing.  You can do this quite simply by either setting a break point in vTaskIncrementTick() (in task.c) or by inspecting the xTickCount variable when the application has been running for a while.  xTickCount should not be zero after a tick interrupt has executed.

If the tick interrupt is executing please post the outline of your tasks here.