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Issue with NVIC_Configure() on STM32F100

Posted by Saccrue on June 29, 2013
I'm stuck on an issue. I have an STM32F100 VL Discovery board and I have setup FreeRTOS on it. I have two tasks and all works well on scheduling and running them. I added a USART driver to send characters to a terminal program through the USART. That seems to work fine, one of my tasks puts a character out to the serial port periodically.
The issue I am having is trying to setup an ISR to receive characters from the terminal program on my PC. If I uncomment the line to NVIC_Configure() I get a hard fault after the scheduler starts. If I comment out the line, all works as before.
void NVIC_Configuration()
{
NVIC_InitTypeDef NVIC_InitStructure;

/* Configure the NVIC Preemption Priority Bits */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

/* Enable the USART3 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

Any ideas? The same code with FreeRTOS commented out works fine. So, there is something i'm missing about setting up the ISR and the presence of FreeRTOS.

RE: Issue with NVIC_Configure() on STM32F100

Posted by Dave on June 29, 2013
Search for "If you are using an STM32" on this page http://www.freertos.org/RTOS-Cortex-M3-M4.html. It is in red.

RE: Issue with NVIC_Configure() on STM32F100

Posted by Saccrue on June 29, 2013
Bam. Thanks.


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