ATMega644 - WinAVR - FreeRTOS7.0.1
Initially I start only one task and put the micro to sleep. If the start button is pressed, the micro wakes up and then other tasks are started. If the system is then turned off, those other tasks are deleted by the main task and then it goes back to sleep. When I start two additional tasks from the main, I can turn it on and off five times - the sixth time doesn’t start properly. If I start only one task, I can turn on/off 10 times before failure. I found that xTaskCreate is returning errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY - obviously I’m doing something wrong to use up memory. So that is my first issue - what am I doing wrong? I do not allocate any memory - only have declared variables. I thought maybe I was putting the micro to sleep before the OS had time to clean up, so I added this:
num = uxTaskGetNumberOfTasks();
if (num == 2)
vTaskDelay( ( portTickType ) 200 / portTICK_RATE_MS );
It appears to drop to two tasks after one loop, which makes sense - I assume the 2nd task is the Idle task. So that doesn’t appear to be the problem. Any ideas about why I’m using up memory? Or is more time needed?
The second issue is that I question whether xTaskCreate is working as expected when it returns errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY. Again using uxTaskGetNumberOfTasks() to look at the number of tasks, it appears that the task was not actually created when the error is returned. However, it returns a Handle, which I did not expect - assumed it would return 0 for Handle if not created. I was checking for a non-zero Handle before calling vTaskDelete. When I did this - tried to delete the tasks that weren’t really created, it ended up deleting all my tasks - uxTaskGetNumberOfTasks() = 0. Is that how you would expect it to work?