RDA_UART_CMD_SET
cmd_set = rda_uart_read(port, RDA_UART_CMD_SET);
val = rda_uart_read(port, RDA_UART_CMD_SET);
rda_uart_write(port, (val | RDA_UART_RTS), RDA_UART_CMD_SET);
val = rda_uart_read(port, RDA_UART_CMD_SET);
rda_uart_write(port, val, RDA_UART_CMD_SET);
val = rda_uart_read(port, RDA_UART_CMD_SET);
rda_uart_write(port, val, RDA_UART_CMD_SET);
cmd_set = rda_uart_read(port, RDA_UART_CMD_SET);
rda_uart_write(port, cmd_set, RDA_UART_CMD_SET);