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queue writeto and pcreadfrom pointer corruption

Posted by mikezz on September 26, 2016

FreeRTOS V9.0.0 Eclipse: Mars.2 Release (4.5.2) (GNU Tools for ARM Embedded Processors) 5.2.1

I have a simple queue (int8_t) that is sent data in a task, and removed in a Serial interrupt function.

Within 256 characters I can see these 'writeto' and 'pcreadfrom' pointers get out of step wrt uxMessagesWaiting.

I'm sure I'm doing something silly but otherwise stuck. Any pointers (please excuse pun) would be appreciated.


queue writeto and pcreadfrom pointer corruption

Posted by rtel on September 26, 2016

Thanks for posting the FreeRTOS and tool versions - unfortunately you didn't say which chip you are using.

If you are using a Cortex-M then the most likely cause will be the priority of the interrupt you are using. Do you have configASSERT() defined and stack overflow protection on?

http://www.freertos.org/a00110.html#configASSERT http://www.freertos.org/Stacks-and-stack-overflow-checking.html http://www.freertos.org/RTOS-Cortex-M3-M4.html


queue writeto and pcreadfrom pointer corruption

Posted by mikezz on September 26, 2016

Apologies, yes that might help!!

STM32F103RB


queue writeto and pcreadfrom pointer corruption

Posted by heinbali01 on September 27, 2016

Maybe you can show some code that writes to and reads from the queue? Within the interrupt, I suppose you're using the fromISR() functions?


queue writeto and pcreadfrom pointer corruption

Posted by mikezz on October 2, 2016

Spot on. One interrupt was a higher priority than defined by configMAXSYSCALLINTERRUPT_PRIORITY

Many thanks, all is now working and queues working fine :-)


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