STM32H750 UART4 + RS485 + DMA not working

[BSANT.17]

Hi,

I have some problems with UART4 on STM32H750. Uart4 is asynchronous RS485 mode mapped on PC11,PC10 and PA15 (DE).

1. I tried to SWAP RX/TX without succeed. Finally, I swapped it by wire.
2. DMA not working properly. DMA Counter works. Memory address never increment, all car was write on tab[0]. Data was 32bits aligned on RAM_D1, increment addresss is checked on cubeMX. Cache is disabled...

Anyone tried UART4 DMA on STM32H750 cubeMX ?

Regards,

Benjamin.