SoftwareSerial baudrate cannot be changed dynamically

[gicking]

I have a library which provides LIN communication across a variety of architectures and serial interfaces. To generate LIN BREAK signal, I temporarily reduce the baudrate, send 0x00 and revert to the original baudrate.

However, when porting to the Uno R4 Minima I found that here the SoftwareSerial baudrate is fixed by the first call to SoftwareSerial.begin() and cannot be changed afterwards. Closing the interface or adding a delay also doesn't help. Attached please find a small sketch and screenshots to show what I mean.

Can you please look into that? Thanks a lot in advance!

Looking forward to a lot of fun with the new UNO :-)

Test_SWSerial_Baudrate.zip

[gicking]

I initially assumed that the issue is caused by if(!initialized) in begin(), respectively the missing initialized = false in end().

However, adding initialized = false to end() does not solve the issue. Unfortunately I don't understand enough of this implementation via DMA to dig deeper... :-(