TMS320F28069: How to polling NACK in I2CSTR?

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