UART_GET_CTRL
cr = UART_GET_CTRL(port);
cr = UART_GET_CTRL(port);
cr = UART_GET_CTRL(port);
ctrl = UART_GET_CTRL(port);
old_cr = UART_GET_CTRL(port);
cr = UART_GET_CTRL(port);
if (UART_GET_CTRL(port) & (UART_CTRL_RE | UART_CTRL_TE)) {
cr = UART_GET_CTRL(port);
cr = UART_GET_CTRL(port);