STM32H743 DMA not working

[BPark.5]

In the program that transmits the value received from uart4 to uart5, I want to move the value received from uart5 to another buffer, but I move it to HardFault_Handler.

what is the reason?

And please check if the method of receiving data using the dma I implemented is the correct program.

 if((RX_BUFFER4_SIZE) != __HAL_DMA_GET_COUNTER(huart4.hdmarx) ){

   SCB_InvalidateDCache_by_Addr((uint32_t*)RX_BUFFER4, RX_BUFFER4_SIZE);    

   HAL_UART_Transmit(&huart5,RX_BUFFER4,RX_BUFFER4_SIZE-__HAL_DMA_GET_COUNTER(huart4.hdmarx),0xFFFFFFFF);  

   __HAL_DMA_DISABLE(huart4.hdmarx); 

   __HAL_DMA_SET_COUNTER(huart4.hdmarx,RX_BUFFER4_SIZE);

   __HAL_DMA_ENABLE(huart4.hdmarx);

   memset(RX_BUFFER4,0x00,sizeof(RX_BUFFER4));  

  }

  if((RX_BUFFER5_SIZE) != __HAL_DMA_GET_COUNTER(huart5.hdmarx) ){

    SCB_InvalidateDCache_by_Addr((uint32_t*)RX_BUFFER5, RX_BUFFER5_SIZE);      

   HAL_UART_Transmit(&huart4,RX_BUFFER5,RX_BUFFER5_SIZE-__HAL_DMA_GET_COUNTER(huart5.hdmarx),0xFF);

   memcpy(RX_BUFFER_WAV,RX_BUFFER5,4096-bytesRx);

   __HAL_DMA_DISABLE(huart5.hdmarx); 

   __HAL_DMA_SET_COUNTER(huart5.hdmarx,RX_BUFFER5_SIZE);

   __HAL_DMA_ENABLE(huart5.hdmarx);

   memset(RX_BUFFER5,0x00,sizeof(RX_BUFFER5));

  }

[Tesla DeLorean]

I don't understand the rational for the logic.

The buffers need to be properly aligned so the invalidation works properly.

The HAL_UART_Transmit()s will block.

You should be able to unpack the Hard Fault to understand, or surmise, the reason for it. You should be able to identify what the MCU doesn't like.

[BPark.5]

What do you mean by sorting buffers?

please tell me specifically

[TDK]

Doesn't seem like you're using the right calls. If you want to use DMA, then HAL_UART_Transmit_DMA/HAL_UART_Receive_DMA should be used.

Also possibly this:

https://community.st.com/s/article/FAQ-DMA-is-not-working-on-STM32H7-devices

[BPark.5]

yes thank you so much for your help

I changed the setting value by referring to the data you sent

However, when data is sent to uart5, it says that it receives a value in the receive buffer and then does not receive it.

Changed HAL_UART_Transmit -> HAL_UART_Transmit_DMA.

[TDK]

> it says that it receives a value in the receive buffer and then does not receive it.
No idea what this means.
There are examples for UART DMA in the Cube repository you should get working.