TMS320F28035 I2C Implementation

Other Parts Discussed in Thread: TMS320F28035

I have an implementation for I2C for the TMS320F28035. I had everything working for communication, had to make some setup changes with hardware and now the 28035 no longer communicates over the bus. I just want to verify that my code is correct.

I am seeing the SCL line go line once the command register is set but it never comes back high again for a new cycle.

static void InitI2CGpio()
{
   EALLOW;
   SysCtrlRegs.PCLKCR0.bit.I2CAENCLK = 1;
   // Enable pull-ups for I2C pins
   GpioCtrlRegs.GPBPUD.bit.GPIO32 = 1;
   GpioCtrlRegs.GPBPUD.bit.GPIO33 = 1;

   // Asynchronous input selection
   GpioCtrlRegs.GPBQSEL1.bit.GPIO32 = 3;
   GpioCtrlRegs.GPBQSEL1.bit.GPIO33 = 3;

   // Configure pin operation
   GpioCtrlRegs.GPBMUX1.bit.GPIO32 = 1; // SDA
   GpioCtrlRegs.GPBMUX1.bit.GPIO33 = 1; // SCL

   EDIS;
}

void I2CInit()
{
   InitI2CGpio();

   I2caRegs.I2CMDR.bit.IRS = 0; // Reset the I2C module

   I2caRegs.I2CPSC.all = 5; // Prescaler - need 7-12 Mhz on module clk
   I2caRegs.I2CCLKL = 5; // Allow more time when clock is low
   I2caRegs.I2CCLKH = 5; // Need less time when clock is high

   I2caRegs.I2CIER.all = 0; // Disable interrupts
   I2caRegs.I2CFFTX.all = 0; // Disable FIFO mode and TXFIFO

   I2caRegs.I2CMDR.bit.IRS = 1; // Take I2C out of reset
}

WORD I2CWrite(I2C_MESSAGE_T* message)
{
   WORD status = I2C_SUCCESS;

   // Setup slave address
   I2caRegs.I2CSAR = message->SlaveAddress;

   // Setup number of bytes to send
   I2caRegs.I2CCNT = message->NumberOfBytes;

   for(WORD i = 0; i < message->NumberOfBytes; i++)
   {
      I2caRegs.I2CDXR = *(message->DataBuffer + i);
   }

   // Send start as master transmitter
   I2caRegs.I2CMDR.all = 0x2E20;

   return status;

}