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Hard Fault after Interupt processing

Posted by sirdogged on September 25, 2012
Hello.
I installed and configured freeRTOS 7.2.0. After that i wrote a test program just to play with semaphores. If i push button on the board, led flashing mode should change. So i implemented all tasks, and, the strange fact is ISR process only one interrupt from the buttion, after second it executes portEND_SWITCHING_ISR function and hardfaults immidiatly.
Could someone help me?
Here is my code:
http://pastebin.com/JLHmR8j7
Here is problem part:
void EXTI0_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line0) != RESET)
{
static portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
EXTI_ClearITPendingBit(EXTI_Line0);
xHigherPriorityTaskWoken = pdFALSE;
xSemaphoreGiveFromISR( xBinarySemaphore, &xHigherPriorityTaskWoken );
portEND_SWITCHING_ISR(xHigherPriorityTaskWoken);
}
}

After 2 press hardfault exception occurs.

RE: Hard Fault after Interupt processing

Posted by Richard on September 26, 2012
Some ideas.

- The code you post does not show the interrupt priority being set, or the number of preemption priority bits being set. Please see http://www.freertos.org/RTOS-Cortex-M3-M4.html.

- When cr is 1, you create vBlinkLed before deleting vBlinkLed1. Are they trying to access the same hardware pins simultaneously?

- What is being executed when the hard fault occurs?
http://www.freertos.org/Debugging-Hard-Faults-On-Cortex-M-Microcontrollers.html

Regards.


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