stm32f4 Discovery board UART DMA interrupt is not being serviced.

[anuja]

Posted on May 28, 2014 at 00:02

Hi,

I'm trying to configure the UART in DMA mode, but I cannot get the interrupts to work.I have attached my code.Any help will be appreciated.Thanks

[Tesla DeLorean]

Posted on May 28, 2014 at 02:55

C++ with code/definitions missing

Have the IRQHandler names gotten mangled? Check the .MAP file, check the linkage to the vector table. extern ''C'' ??

// Clear DMA Transfer Complete interrupt pending bit. DMA_ClearITPendingBit(DMA1_Stream3, DMA_IT_TCIF1);

DMA_IT_TCIF3?

DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)mpoRxQueue; // Pointer to Reception Queue.

Are you sure this is the buffer address and not the object?

// Enable DMA Stream Half Transfer interrupt. DMA_ITConfig(DMA1_Stream1, DMA_IT_HT, ENABLE);

You are not servicing the HT interrupt. If you still have problems, make sure that the DMA isn't signalling any errors.

[anuja]

Posted on May 28, 2014 at 18:47

Thanks Clive.

I corrected the code to point to the correct bit.I was concentrating on the Tx code and had not looked into the Rx part. Thanks for debugging that it was pointing to an object instead of an array.I added the Interrupt for Transfer Error, none of the interrupts are getting triggered.The mapping in the vector table is correct. I have externed ''C'' the entire stm32f4xx_it.c file.I cannot figure out why the interrupts are not getting serviced.  

[waclawek.jan]

Posted on May 29, 2014 at 08:44

Read out and post value of USART3 registers and the DMA registers of relevant streams' + LISR/HISR.

JW

[anuja]

Posted on May 29, 2014 at 22:39

Thanks for pointing me towards the registers Jan. 

Turns out the register values were not getting updated because I had not set the RCC clock value correctly.