• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 33 subscribers
  • Views 430 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS65982 Register read

user4685513
Prodigy 20 points
Other Parts Discussed in Thread: TPS65982

Does anybody face the issue below:

Read->0x29:08c0540071

Read->0x28:0a8d033f45f70c102ad800

i use same read function for 0x29 and 0x28 register,but i think the 0x29 register reading return wrong length.

the length on spec is 4 bytes. or is there any difference between TPS65982 series?

e2e.ti.com/.../

  • 0
    TI__Mastermind 30280 points

    The length of Control Config, Reg. 0x29 is 4 bytes. You are correct, the documentation is correct, and the data is correct. 0xC0 54 00 71 means the following bits are enabled:

    • Process Swap to Source
    • Initiate Swap to Source
    • Process Vconn Swap
    • Process Swap to UFP
    • Process Swap to DFP
    • Automatic ID Request

    And a few innocuous Reserved bits are '1' but will be ignored by your code if it is defined in a structure as Reserved.

    For Read/Write Registers like 0x29, the Register Length is already defined correctly in order for you to Write to this Register of the TPS65982.

    Returning the wrong length when a register is being Read is not usually a problem, since a NAK is sent by the I2C Slave when it is done sending data.

    It doesn't appear that your code malfunctioned as a result of this error, but it is a strange inconsistency. Thanks for pointing it out!