Question
STM32F091 USART1 - Delay on first char to transmit after enabling transmitter (TE)
Trying to send over USART1 at 19200 bit/s.
USART is resting in receive mode (RE==1, TE==0).
After switching to transmit mode (TE:=1, RE:=0), we observe a ~500 us delay between storing and transmitting of first character. Subsequent chars are transmitted without delay.
Watch commented line // USART1->TDR = c; in first picture. No TDR, no Delays
