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[FreeRTOS Home] [Live FreeRTOS Forum] [FAQ] [Archive Top] [May 2011 Threads] PIC24 C30 ISR queue failure in minutesPosted by Chip Mauler on May 30, 2011 My test collects adc data under 100Hz interrupt (using xQueueSendFromISR ) and the highest priority task unloads the data but the queue only works for a few minutes. I see the interrupt routine still gets executed and another lower priority delay based task is unaffected. I have changed queue length, task priority, stack size etc read numerous examples and I have stack check enabled, but I'm at a loss when the queue ceases to indicate received after a few thousand correct operations! Also Latest FreeRTOS V7.0.1 Copied ISR from PIC24 port demo serial handler Vindicated hardware, as I substituted the queue with a C based creation based on shared variable with flags, and it ran overnight without issue.
Suggestions for possible/typical reasons or line of experimentation to determine cause? Thank you for your time and consideration
RE: PIC24 C30 ISR queue failure in minutesPosted by Richard on May 30, 2011 Do you have the priority of the ADC interrupt set to configKERNEL_INTERRUPT_PRIORITY (the lowest priority)? If not, then set it to configKERNEL_INTERRUPT_PRIORITY and give it another try.
See the "RTOS Port Specific Configuration" section on http://www.freertos.org/portpic24_dspic.html
Regards.
RE: PIC24 C30 ISR queue failure in minutesPosted by Chip Mauler on May 30, 2011 Thanks, it did the trick. Frustrating when you spend extra time to sort out a problem but tiredness limits you.
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