At read-read-write-write-read sequence MCU can read bytes which was sent over write.
The read at start MCU can cause infinity loop because tc bit will be set only after write.
To fix it I allow either transmitter (cr1.te()) or receiver (cr1.re()) at write, read and flush calls.
Tested on STM32F446RE with two Half-Duplex protocols: Smart Audio and CRSF.
Dirbaio
commented
1 week ago
After #2895 I discoverer the same problems:
write.readat start MCU can cause infinity loop becausetcbit will be set only afterwrite.To fix it I allow either transmitter (
cr1.te()) or receiver (cr1.re()) atwrite,readandflushcalls. Tested onSTM32F446REwith two Half-Duplex protocols: Smart Audio and CRSF.