STM32H7 USART1 DMA is not working..

[Vel]

Hi team,

I'm using STM32H753BI. Here i'm using USART1 (PA9 & PA10) in DMA Mode. That code is generated by cubeMX and also i tried the example program of STM32H743-EVAL Board. Both are not working.

Here i have attached the hal_msp_file.c and main.c for your reference.

Thanks,

vel.

[TDK]

What does "not working" mean here specifically? How do you know it's not working?

[Tesla DeLorean]

DMA does work on the H7/UART

I suspect you're going to have to be more attentive to the memory buffer addresses, cache coherency, and program flow here.

[Vel]

Hi,

Thanks for your response. I'm expecting the data in Hyper terminal. But data was not shown the terminal. That's why i mentioned its not working.

[Tesla DeLorean]

If the interrupt and polled versions transmit successfully the UART works.

If the DMA isn't sending the expected data, check the buffer address

[Vel]

Hi,

Yes, interrupt and polled version transmission is working fine.

verified the buffer address, it is correct.

HAL_DMA_ERROR_TE error bit was set while transmitting the data.

[waclawek.jan]

> verified the buffer address

Tell us that address.

JW

[Vel]

Hi,

Thanks for your response. I understand your point. That's why I'm follow the example program for STM32H743I-EVAL Board example. but example program also not working.

HAL_DMA_ERROR_TE error bit was set while transmitting the data.

[Vel]

Hi,

Thanks for your response. Here I'm mentioned the DAM Address. Buffer Address is 0x400200xx..

Thanks,

vel

[waclawek.jan · Accepted solution]

Tx buffer (aTxStartMessage) is at 0x20000000 and that's DTCM which is not accessible by DMA.

JW