F411 USART Low Level Driver Not Work Well

[djsg]

F411 USART Low Level Driver Not Work Well

[MaJerle]

Aside using HAL for UART - do you also use HAL for other things when it works?

[djsg]

No, for the working HAL UART code, it only Tx through UART2 to a PC, while my LL code does a little bit more: it also uses UART1 to communicate to another module. However, communications with the two ports are sequential. They don't work at the same time.

[djsg]

The USB to UART cable (TTL-232R-3V3) is 2 meters long. Not sure if it contributes to the problem.

[MaJerle]

If you use debugger - do you see any UART error status bit set somewhere? Do you have any other interrupt that is not allowing this code to proceed?

[djsg]

For debugger, you mean IDE like Keil, right?
How to check UART error status bit? Check the UART register? I haven't looked into it.
For testing the baud rate code, I don't have any interrupt enabled.
In fact, I follow your code structure to make the UART communication.
For Tx, there is no DMA and no interrupt.
For Rx, I use DMA and 2 interrupts: buffer full and half full. But my problem happens in the Tx part, the Rx part is not enabled yet.
Thx for your time and advice. I will investigate more to find out why.

[MaJerle]

Keil or IAR or CubeIDE are one of the IDEs. In case of GCC, you can debug even in command line.