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CCS/BQ76PL455EVM: ReadReg no response

Harold
Prodigy 130 points
Part Number: BQ76PL455EVM

Tool/software: Code Composer Studio

Hello,

I'm trying to read a register from the PL455.

with the command :

nDev_ID = 0

nRead = ReadReg(nDev_ID, 13, &wTemp,1,0)

But i don't get any response.

In the datasheet of the PL455 the register is R/W and 1 byte 

What could be the problem?

With kind Regards,

Harold

  • 0
    TI__Genius 11480 points
    Hi Harold,

    Can you share your schematic/connections with me please?

    Make sure you are powering the device from the cell side and waking up the part before communicating. It also looks like you are using your own API - if you can share the details of your ReadReg function that would be helpful.

    Also make sure your baud rate of the MCU matches the baud rate of the pl455. Factory default of the PL455 is 250kBaud.

    I recommend putting a logic analyzer on the TX/RX pins to verify communications. I use a small Saleae and it is very handy.
  • 0 in reply to David Wiest Jr
    Prodigy 130 points
    Hello David,

    It is resolved!