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BQ27320: DEVICE_NAME mac subcommand description missing in TRM

Jure Vidmar
Prodigy 60 points
Part Number: BQ27320

Hello,

I am writing a driver for a BQ27320, using the Technical Reference Manual (SLUUBE6A, March 2018) and can not find description of the DEVICE_NAME subcommand in section 2.1.x.
How many bytes should it return? Is the subcommand number, 0x004A, correct?

With my implementation of `read_mac_command()` I can successfully read DEVICE_TYPE (0x0001) while DEVICE_NAME (0x004A) returns garbage data, response length is 11 bytes (MACDataLen register at 0x61).

  • 0
    TI__Guru 57747 points

    Hello Jure,

    Device name is stored as ASCII characters in Data memory.

  • 0 in reply to Shirish
    Prodigy 60 points

    Thank you for your response.
    It was a bug on my side (was reading into uint8_t instead of char array, and did not add the null-terminator before printing it out).

    In case somebody else is struggling with understanding MACDataLen, here is explanation:
    MACDataLen (11 bytes) = device name string (7 bytes, without null terminator, just ascii letters) +  mac subcommand (2 byte) + checksum (1 byte) + length byte itself (1 byte).