RDA_UART_STATUS
val = rda_uart_read(port, RDA_UART_STATUS);
status = rda_uart_read(port, RDA_UART_STATUS);
while (!(rda_uart_read(port, RDA_UART_STATUS) &
while ((rda_uart_read(port, RDA_UART_STATUS) & RDA_UART_TX_FIFO_MASK) &&
status = rda_uart_read(port, RDA_UART_STATUS);
status = rda_uart_read(port, RDA_UART_STATUS);
rda_uart_write(port, 0, RDA_UART_STATUS);
while (!(rda_uart_read(port, RDA_UART_STATUS) & RDA_UART_TX_FIFO_MASK))
while (!(rda_uart_read(port, RDA_UART_STATUS) & RDA_UART_TX_FIFO_MASK))