matrix_speaker.py 文件源码

def getVolume(self):
        list = [0x3]
        list.append(self.__cmd_reqDict['Volume'])
        cmd = self.__makeCommand(list)

        length = self.__ser.write(cmd)
        time.sleep(0.3)
        if length != len(cmd):
            self.__logger.error('write %d - %d /dev/ttyS2 failed.', len, len(cmd))
            return False
        ack = self.__ser.read(self.__ackLen)
        if ack.find('OK') == -1:
            return False
        valueStr = '0x' + ack[2:]
        value = string.atoi(valueStr, 16)

        return value

        #######################################

    ##    get current play device
    ##    0:USB 2:SPI
    #######################################