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 http://www.ti.com/product/BQ76940/toolssoftware 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

Thanks