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.

BQ76940EVM: MSP430FR2355

Part Number: BQ76940EVM
Other Parts Discussed in Thread: BQ76940, MSP-TS430PT48, , EV2400

We are working on the msp-ts430PT48 communicate with BQ76940 EVM through external I2c.

1> BQ76940EVM is working with EV2400 on GUI

     We can send and receive  I2c data from the window gui app

2> msp-ts430PT48 can run sample code modified from  msp430fr2335 launch pad.

3> we run the code from and did pull up action from code    

       P4SEL0 |= BIT6 + BIT7;
       P4SEL1 = 0;

       P4OUT |= BIT6 + BIT7;
       P4REN |= BIT6 + BIT7;

    we did see the address send out and captured from the scope , however, we did not see ACK from the BQ79640 for the very first time.

      and  register show UCNACKIFG = 1. UCTXIFG0 =1

How could be the issue here, please advise