There is one caveat. For some reason with first send using usart_v1/usart_v2 TC flag appears right after first byte from buffer is written to DR. Consecutive transfers work as expected - TC flag appears when last byte is fully transferred to wire.
There is one caveat. For some reason with first send using usart_v1/usart_v2 TC flag appears right after first byte from buffer is written to DR. Consecutive transfers work as expected - TC flag appears when last byte is fully transferred to wire.