if((buf[0] == 0x01) && (buf[1] == 0x01)) {
    REG_GPIO.PDORF &= ~0x00000008;   /* LED ON */
}
else if((buf[0] == 0x01) && (buf[1] == 0x00)) {
    REG_GPIO.PDORF |= 0x00000008;   /* LED OFF */
}
