UART_DMA(LPUART) working oddly on STM32WB55

[Kolab]

Hello, I have been trying to send and receive data through UART using DMA on STM3WB55. Everything was working properly but suddenly HAL_UART_Transmit_DMA started to work unproperly: the program gets stuck in the Hard Fault function. I am calling HAL_UART_Transmit_DMA inside the function HAL_UART_RxCpltCallback. When I call it in the while loop in the main.c file, the program works good. My buffers are 71 and 273 long. Later I tried HAL_UART_Transmit and HAL_UART_Transmit_IT inside HAL_UART_RxCpltCallback but none of them works anymore. When I comment this line, the program works good.

I attached the main.c , stm32wbxx_it.c and usart.c files.

Here is the call stack untill it falls into the hard fault function:

What I want to do is to send data after the reception is complete. The reception through HAL_UART_Receive_DMA seems to be correct. Just the transmit. Any clue? Thank you.

[TDK]

Would be helpful to see the complete code. Where is the definition of res?

Line 1422 has nothing on it in the latest library, so you must be on a different version.

https://github.com/STMicroelectronics/STM32CubeWB/blob/master/Drivers/STM32WBxx_HAL_Driver/Src/stm32wbxx_hal_uart.c#L1422

The code you've posted won't even compile since the brackets are unbalanced.

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart){
 
if(huart==&hlpuart1)
 
state = HAL_UART_Transmit_DMA(&hlpuart1,(uint8_t*)res,(uint16_t)NMEA_COORD_LEN);
 
}
 
}

[Kolab]

@TDK​  I've updated the post. Sorry for the sorry for the inconvenience

[Javier1]

Did you just Updated stm32cubeIDE to version 1.9.0?

I had problems because they changed the compiler to gcc10, it gave me similar problems

[Kolab]

I have just updated. But the problem persists.

[Kolab]

what do you mean by "Line 1422 has nothing on it in the latest library, so you must be on a different version"?

[Kolab]

I finally made it work. I had just to change the length of my buffer from 71 to 70 or 72 and it started working properly. I'm not sure if DMA sympathize more with even lengths.

[BIsma.2]

How did you manage to make LPUART1 working in the first place. i wrote a simple code that transmit a char evry 500 Ms and it wont work

[Kolab]

in my case it got working on its own :)