Resolved! why is there a delay between (DR register written) and (data really showed) in UART on STM32F103CB?
I'm curious about the delay time between the title mentioned, I toggled an IO when I wrote data into UART->DR, the delay time varies from 3 micro seconds to 10x micro secondsint main(void) { /* initial code generated by STMCubeMX */ HAL_Init(); S...