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TMS320F28069: How to polling NACK in I2CSTR?

Johnson Chu
Prodigy 60 points

Part Number: TMS320F28069

The device is working on slave mode for PMBUS.

And I always reset this bit before transmit each data.

But this bit always indicates "0" both "Acknowledgment" and "No-Acknowledgment".

This bit can indicates byte by bye or it just can be used for whole package?

My I2CMDR settings is 0x20.

Best Regards,

Johnson

  • 0
    TI__Mastermind 45606 points

    Hi Johnson,

    The NACK bit should be set whenever your device is a receiver and sees a NACK at the end of a byte.

    The bit can be cleared by any of the following:

    • An acknowledge bit (ACK) has been sent by the receiver.

    • NACK is manually cleared. To clear this bit, write a 1 to it.

    • The CPU reads the interrupt source register (I2CISRC) and the register contains the code for a

    NACK interrupt. Emulator reads of the I2CISRC do not affect this bit.

    • The I2C module is reset.

    You'd poll the bit like so:

    if(I2caRegs.I2CSTR.bit.NACK == 1)
{
    Do something;
}

    Best,

    KEvin

  • 0 in reply to Kevin Allen18
    Prodigy 60 points
    Hi KEvin,

    I got it. Thank you.

    Best Regards,
    Johnson