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I2C and USCI_I2C_UCNACKIFG interrupt

bj Wang
Prodigy 235 points

Hello Guys

I am trying to test my i2c code(Read and write eeprom) on the MSP-EXP430F5438 board. And i am trying to trigger the USCI_I2C_UCNACKIFG interrupt by disconnecting

the eeprom , but failed.  Is there any googd way to trigger the USCI_I2C_UCNACKIFG interrupt?

Thanks a lot!
BR

Charles

  • 0
    Prodigy 160 points

    If the device you are trying to select is not present on the bus you should get a NACK as nothing will generate the ACK in response to the device address you send.

    If you are not seeing the the NACK with the EEPROM disconnected then there is a configuration issue, eg interrupts not enabled etc.

    If you are trying to generate a NACK in mid data transfer thats harder and I would suggest mocking that up in your code so you pretend the NACK was seen after a number of bytes transferred. However, most devices will generate a NACK under some conditions, eg EEPROM writing beyond a page boundary or some such.

    Nick

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