One of the most useful functions when developing an embedded system is to convert one of the available UARTs into a logging port, where debug messages and other information produced during the execution can be read on the host computer using a serial-to-USB converter:
The host is connected to the serial port of the target platform using a converter
The UART logic includes FIFO buffers in both directions. The transmit FIFO is fed by writing on the UART_DR register. To actually output data on the UART TX line in polling mode, we choose to check that the FIFO is empty before writing each character, to ensure that no more that one ...
