We had an issue using our software and your recommended registry settings with the BSP 1.4 Beta1:
By default the UART B is now configured to use DMA (EnableDMA=1), but if you also enable RTSToggleAlwaysOn=1 and RTSPol=1 (which we need for RS-485), the RTS signal is actually set to low before all data is sent:
[upload|gsqd+I7ovRVoqz2moDzcQtW5qN8=]
Rows:
- RXD
- TXD
- RTS
As a comparison a similar telegram on BSP 1.3 Final:
[upload|l7cft+qWOWuaugCFqJqk+zPDtQ0=]
Setting EnableDMA=0 in the registry solved the problem - but that wasn’t obvious at all.