Timer and I2C intergration issues

Hi,

I assume that the program control is hanging at the function EEPROM_AckPolling. The I2C module of the MSP430x16x family does not really support the transmission of the control byte onlhy. However, with a trick that is used in the app note slaa208 this can be realized. Care should be taken regarding to the timing within the EEPROM_AckPolling routine - it should not be interrupted.

So first of all I would check where the code execution is hanging (my assumption is it hangs within the EEPROM_AckPolling function). 

If so I would try either:

- to replace the EEPROM_AckPolling function by a wait loop (length depends on the EEPROM)

- or try to change the EEPROM_AckPolling function as follow:

void EEPROM_AckPolling(void)
// Description:
//   Acknowledge Polling. The EEPROM will not acknowledge if a write cycle is
//   in progress. It can be used to determine when a write cycle is completed.
{ unsigned int count;
  while (I2CDCTL&I2CBB); // wait until I2C module has finished all operations
  U0CTL &= ~I2CEN;       // clear I2CEN bit => necessary to re-configure I2C module
  I2CTCTL |= I2CRM;      // transmission is software controlled
  U0CTL |= I2CEN;        // enable I2C module
  I2CIFG = NACKIFG;      // set NACKIFG
  while (NACKIFG & I2CIFG)
  {
    I2CIFG=0x00;            // clear I2C interrupt flags    U0CTL |= MST;           // define Master Mode
    I2CTCTL |= I2CTRX;      // I2CTRX=1 => Transmit Mode (R/W bit = 0)

    _DINT;   // **** disable interrupts. following code lines should not be interrupted (time critical!!!)

    I2CTCTL |= I2CSTT;      // start condition is generated
    while (I2CTCTL&I2CSTT); // wait till I2CSTT bit was cleared
    I2CTCTL |= I2CSTP;      // stop condition is generated after slave address was sent
                            //      => I2C communication is started

    _EINT;   //**** enable interrupts again

    while (I2CDCTL&I2CBB); // wait till stop bit is reset
  }
  U0CTL &= ~I2CEN;       // clear I2CEN bit => necessary to re-configure I2C module
  I2CTCTL &= ~I2CRM;     // transmission is by the I2C module
  U0CTL |= I2CEN;        // enable I2C module

  return;
}