STM32CubeMX HAL drivers: UART - DMA and Receive Timeout Interrupt for variable buffer sizes

[JHorv]

Regarding to the question posted here:

https://community.st.com/s/question/0D50X00009XkaG2SAJ/using-stm32fcubemx-hal-drivers-for-uart-rx-with-unknown-size-data

I have the exact same problem using a STM32-L432KC. Is there any sample code showing how to implement a Receive Timeout Interrupt handler using HAL?

Thanks in advance

[S.Ma]

Dma needs depend on the baudrate. 115200bps makes 1 byte per 100usec. If the core runs at 48Mhz, thats 4800 cycles: byte by byte interrupt might be an intermediate step?

[waclawek.jan]

https://community.st.com/s/feed/0D50X00009XkW2nSAF

[HABOT]

If you want to check for every single received byte, I'd rather suggest using LL drivers, enable RXNE interrupt and process it within the ISR.

If you want to use DMA, i always suggest the creation of a protocol stack with chunked transfers. This approach solves the fixed-length buffer required by DMA.