MSPM0G3507: MSPM0 uart_callback example with FreeRTOS | UART interrupt always get triggered

Hi, zhuang

now, your M0's IIDX = 17, it's a DMA DONE on RX event.

It seems function [UARTMSP_interruptHandler] in file [UARTMSPM0.c] didn't clear the interrupt pending bit.

You can add a line as below at bottom of [UARTMSP_interruptHandler] to clear all the interrupt or status.

DL_UART_clearInterruptStatus(hwAttrs->regs, 0x1FFFF);

or

DL_UART_clearInterruptStatus(hwAttrs->regs, status);

Regards,

Helic

Hi Hellic,

Thanks for your attention. 

1 now, your M0's IIDX = 17, it's a DMA DONE on RX event. 

  --> Did you mean, IIDX = 10h, not 17  

2  And I followed your suggestion. add the code below UARTMSP_interruptHandler . ( did slight modification).

However it can't even show the Echoing... string, just print E.

Hi, zhuang

zhuang tian said:

1 now, your M0's IIDX = 17, it's a DMA DONE on RX event. 

Yes, It's my mistake. It should be DMA Done on Rx or TX.

zhuang tian said:

However it can't even show the Echoing... string, just print E.

After you clear all the interrupt status, there may cause this.

You can try to clear an single bit flag after entering the corresponding interrupt processing function.

Regards,

Helic

Hi Helic,

1 these code are provided by UART driver library, does it mean UART interrupt handler doesn't handle DMA  related interrupt event properly.

2 I also tried UART_NO_DMA macro and modified UARTObject[] in ti_drivers_config.c. However, it doesn't help. 

3 can you help me try on your side. is it my own problem or  is a common problem.

4 since you guys are more familiar with driver library code, if it needs some modification, its better make change on your side.

Hi, zhuang

It's quite busy recently.

I'll try debugging it as soon as I have time.

From my guess, this demo does not handle the interrupt flag properly.

Regards,

Helic

Hi Helic,

I have a project in solution selection stage, when you have some progress, please let me know. Very appreciate

Hi, zhuang

I have run the latest SDK 2.02 and 2.01, both seems always trigger DMA_Done_Rx interrupt.

Regards,

Helic

Hi, zhuang

I contacted the software team and it looks like this is an issue.

This weekend's SDK release will fix this issue. 

Please be patient for updates.

Regards,

Helic

Hi Helic,

Thanks for letting me know