I want to send some instruction through rs232 to msp430f247 which inturn communicates with a battery through i2c...(infact smbus and there is a level shifter between battery and msp430f247...) Iam not able to get the output. I want to confirm if my code is correct.
This is my code.

#include <msp430F247.h>
#include "Global_Variables.h"
void main(void)
{ 
    
 WDTCTL = WDTPW + WDTHOLD;                     // Stop WDT
      _DINT();                                  //Disable Interrupt
      _NOP();
      
     if (CALBC1_8MHZ ==0xFF || CALDCO_8MHZ == 0xFF)      // If calibration constants erased, do not load, trap CPU!! 
        {
        while(1);                               
        }

      BCSCTL1 = CALBC1_8MHZ;                    // Set DCO to 8MHz
      DCOCTL = CALDCO_8MHZ;

Init_Module_UART_115200();                   

Init_I2c();
_EINT(); // Enable interrupts
}


void DeInitI2c(void)
{
UCB1CTL0 &= ~(ENC+UCSYNC); ///// 1) Clear I2C, SYNC, and I2CEN (CLR.B &U0CTL)
UCB1CTL1 |= UCSWRST; ///////2) Set SWRST (MOV.B #SWRST,&U0CTL)


} 
void Init_I2c(void)
{
P5SEL |= BIT1+BIT2;                                // P5.1,P5.2
UCB1CTL0 |= (UCMST + UCMODE_3  + UCSYNC);           // Master, I2C mode, Synchronous.
UCB1CTL1 &= ~UCSWRST;                     // Clear SW reset, resume operation
  IE2 |= UCB1RXIE;                          // Enable RX interrupt
UCB1CTL1 |= (UCSSEL_2 + UCSWRST);                // SMCLK, Transmitter, Software reset.
                        
UCB1I2CSA = 0x16;                         //battery slave
UCB1CTL0 |= USISWRST;
} 
void Init_Module_UART_115200(void)
{
  UCA1CTL1 |= UCSWRST;
  P3SEL |= 0xC0;                                // P3.6,7 = USCI_A1 TXD/RXD
  UCA1CTL1 |= UCSSEL_2;                         // SMCLK
  UCA1BR0 = 69;                                    // 1MHz 115200; (104)decimal = 0x068h
  UCA1BR1 = 0;                                  // 1MHz 115200
  UCA1MCTL = UCBRS2+ UCBRS1;                              // Modulation UCBRSx =6
  UCA1CTL1 &= ~UCSWRST;                         // **Initialize USCI state machine**
  UC1IE |= UCA1RXIE;
  
}

#pragma vector=USCIAB1RX_VECTOR
__interrupt void USCIAB1RX_ISR(void){
     
  //while (!(UC1IFG & UCB1TXIFG));            // USCI_B1 TX buffer ready?
   
  while( UCA1RXBUF== 0)  
  {
  }                
 UCB1TXBUF = UCA1RXBUF;
 while( UCB1TXBUF== 0)  
  {
  }  
  UCA1RXBUF = UCB1TXBUF;// RX -> TXed character
  DeInitI2c();
}

/*#pragma vector = USCIAB1TX_VECTOR
__interrupt void USCIAB1TX_ISR(void)
{
  RXData = UCB0RXBUF;                       // Get RX data
  __bic_SR_register_on_exit(CPUOFF);        // Exit LPM0
}
*/

 

I2C will run at any speed down to zero... meaning you can troubleshoot it with a dc meter or a LED if that is all you have.

Look for the ACK bit first. If the address you send first is not ACKed then nothing else is possible.

Sorry I will not read all that code.

 

In msp430f247 both uart and i2c have the same USCIAB1RX_VECTOR or USCIAB0RX_VECTOR...So how do I manage?