nm_commands.py 文件源码

def parse_slave_and_channel(file_path):
    """Parse the dumped file to get slave address and channel number.

    :param file_path: file path of dumped SDR file.
    :return: slave address and channel number of target device.
    """
    prefix = '5701000d01'
    # According to Intel Node Manager spec, section 4.5, for Intel NM
    # discovery OEM SDR records are type C0h. It contains manufacture ID
    # and OEM data in the record body.
    # 0-2 bytes are OEM ID, byte 3 is 0Dh and byte 4 is 01h. Byte 5, 6
    # is Intel NM device slave address and channel number/sensor owner LUN.
    with open(file_path, 'rb') as bin_fp:
        data_str = binascii.hexlify(bin_fp.read())

    if six.PY3:
        data_str = data_str.decode()
    oem_id_index = data_str.find(prefix)
    if oem_id_index != -1:
        ret = data_str[oem_id_index + len(prefix):
                       oem_id_index + len(prefix) + 4]
        # Byte 5 is slave address. [7:4] from byte 6 is channel
        # number, so just pick ret[2] here.
        return ('0x' + ret[0:2], '0x0' + ret[2])