what is this github file all about?
yes, but what does it do with comparing STM32F407 function, HAL_USART_Transmit()?
I used ARDUINO and the function ShitOut() to shift the data
I know that I should make them identical but I don't know HOW??
yes I do want to use USART, but not in ARDUINO IDE! that's why I can't use Serial.Write()!