I2C Nada

Hi Liam,

Can you please paste your implementation? Because from what you've described above it seems that I2C has not been initialized properly.

Regards,

Gautam

Hi Gautum,

This is the function for intialising the GPIO as I2C

void InitI2CGpio()
{

   EALLOW;

/* Enable internal pull-up for the selected pins */
// Pull-ups can be enabled or disabled disabled by the user.
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.

// GpioCtrlRegs.GPAPUD.bit.GPIO28 = 0;    // Enable pull-up for GPIO28 (SDAA)
// GpioCtrlRegs.GPAPUD.bit.GPIO29 = 0;    // Enable pull-up for GPIO29 (SCLA)

 GpioCtrlRegs.GPBPUD.bit.GPIO32 = 0;    // Enable pull-up for GPIO32 (SDAA)
 GpioCtrlRegs.GPBPUD.bit.GPIO33 = 0;    // Enable pull-up for GPIO33 (SCLA)

/* Set qualification for selected pins to asynch only */
// This will select asynch (no qualification) for the selected pins.
// Comment out other unwanted lines.

//    GpioCtrlRegs.GPAQSEL2.bit.GPIO28 = 3;  // Asynch input GPIO28 (SDAA)
//   GpioCtrlRegs.GPAQSEL2.bit.GPIO29 = 3;  // Asynch input GPIO29 (SCLA)

 GpioCtrlRegs.GPBQSEL1.bit.GPIO32 = 3;  // Asynch input GPIO32 (SDAA)
  GpioCtrlRegs.GPBQSEL1.bit.GPIO33 = 3;  // Asynch input GPIO33 (SCLA)

/* Configure I2C pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be I2C functional pins.
// Comment out other unwanted lines.

// GpioCtrlRegs.GPAMUX2.bit.GPIO28 = 2;   // Configure GPIO28 for SDAA operation
// GpioCtrlRegs.GPAMUX2.bit.GPIO29 = 2;   // Configure GPIO29 for SCLA operation

 GpioCtrlRegs.GPBMUX1.bit.GPIO32 = 1;   // Configure GPIO32 for SDAA operation
 GpioCtrlRegs.GPBMUX1.bit.GPIO33 = 1;   // Configure GPIO33 for SCLA operation

    EDIS;
}

Function below is from Example_2803xI2C_eeprom.c

void I2CA_Init(void)
{
   // Initialize I2C

 I2caRegs.I2CMDR.all = 0x0000; // Put I2C in reset  added by me
   I2caRegs.I2CSAR = 0x0050;  // Slave address - EEPROM control code

   I2caRegs.I2CPSC.all = 6;      // Prescaler - need 7-12 Mhz on module clk
   I2caRegs.I2CCLKL = 10;   // NOTE: must be non zero
   I2caRegs.I2CCLKH = 5;   // NOTE: must be non zero
   I2caRegs.I2CIER.all = 0x24;  // Enable SCD & ARDY interrupts
   I2caRegs.I2CMDR.all = 0x0020; // Take I2C out of reset
          

   I2caRegs.I2CFFTX.all = 0x6000; // Enable FIFO mode and TXFIFO
   I2caRegs.I2CFFRX.all = 0x2040; // Enable RXFIFO, clear RXFFINT,

   return;
}

Apart from changing the GPIOs to use GPIO33 and 32 and adding a few debug signals to  Example_2803xI2C_eeprom.c , my code is the same as the example code

Liam

Hi,

This initialization seems to be fine. What about other header files? You'll have to alter rest of the files too. Please go through all the hard header files included in the project that seem to be for I2C.

Regards,

Gautam