const crc7Table = [
    0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f,
    0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77,
    0x19, 0x10, 0x0b, 0x02, 0x3d, 0x34, 0x2f, 0x26,
    0x51, 0x58, 0x43, 0x4a, 0x75, 0x7c, 0x67, 0x6e,