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Forum: µC & Digital Electronics TMS DSP2833x_I2C


Author: Muhammad (Guest)
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hello everyone i am  trying to send some digital value Using I2C 
protocol from DSP 2833x (Master)to DAC MCP47x6A0T-E/xx (Slave). Although 
program isnt showing any error but when i check the data line i dont see 
any data on it.  Below is my program. Kindly help me in this regard. 
Your response will be highly appreciated.

 #include "DSP2833x_Device.h"
#include "DSP2833x_Examples.h"
#include "DSP2833x_I2C_defines.h"


void I2CA_Init(void);
void I2CA_Write(int);
void I2CA_Wait(void);

interrupt void i2c_int1a_isr(void);


struct FLAGREG_BITS
{
    volatile unsigned int Rsvd:16;      //bits 0-14
};
union FLAG_REG
{
    volatile unsigned int all;
    struct FLAGREG_BITS   bit;
}Flags;


Uint16 Register;
Uint16 Reg[6];
Uint16 ReadReg[6] = {0,0,0,0,0,0};

Uint16 InData[3];
Uint16 OutData[3];
Uint16 I2cIndex;

#define I2C_SLAVE_ADDR        0xC0

void main (void)

{
  InitSysCtrl();

    InitI2CGpio();
    DINT;
    InitPieCtrl();
        IER = 0x0000;
        IFR = 0x0000;

        InitPieVectTable();
        EALLOW; // This is needed to write to EALLOW protected registers
            PieVectTable.I2CINT1A = &i2c_int1a_isr;
            EDIS;   // This is needed to disable write to EALLOW 
protected registers

            I2cIndex = 0;

        // Step 4. Initialize all the Device Peripherals:
            I2CA_Init();

          //  Step 5, Master I2C register initialization

               Reg[0] = 0x012;
               Reg[1] = 0x024;
               Reg[2] = 0x054;
               Reg[3] = 0x032;
               Reg[4] = 0x073;
               Reg[5] = 0x0FF;


               PieCtrlRegs.PIEIER8.bit.INTx1 = 1;

               // Enable CPU INT8 which is connected to PIE group 8
                   IER |= M_INT8;
                   EINT;
                   while(1)
                       {
 I2CA_Write(0);                   // Transfer Register 0 contents to 
slave.
                      I2CA_Wait();                     // Wait for I2C 
bus to clear

                      I2CA_Write(1);
                      I2CA_Wait();                     // Wait for I2C 
bus to clear

                      I2CA_Write(2);
                      I2CA_Wait();                     // Wait for I2C 
bus to clear

                      I2CA_Write(3);
                      I2CA_Wait();                     // Wait for I2C 
bus to clear

                      I2CA_Write(4);
                      I2CA_Wait();                     // Wait for I2C 
bus to clear

                      I2CA_Write(5);
                      I2CA_Wait();                     // Wait for I2C 
bus to clear



                       }
}

void I2CA_Init(void)
{
   // Initialize I2C
    I2caRegs.I2CSAR = 0x00C0;       // Slave Address.
    I2caRegs.I2COAR = 0x002D;       //  address as Master.
    I2caRegs.I2CPSC.all = 14;       // Prescaler - need 7-12 Mhz on 
module clk// input clk frequency is 150MHz
    I2caRegs.I2CCLKL = 10;          // NOTE: must be non zero
    I2caRegs.I2CCLKH = 5;           // NOTE: must be non zero
    I2caRegs.I2CIER.all = 0xC0;     // Enable SCD & ARDY interrupts

    I2caRegs.I2CMDR.bit.IRS = 1;    // Take I2C out of reset
                                    // Stop I2C when suspended

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

void I2CA_Write(Register)
{
    int Byte0;
    int Byte1;

    Byte0 = Reg[Register]&0x0FF;    // Get low byte of selected 
register.
    Byte1 = Reg[Register]>>8;       // Get high byte of selected 
register.

// Slave Address info gets passed with Start Condition
//    I2caRegs.I2CFFTX.all = 0x6000;    // Enable FIFO mode and TXFIFO
    I2caRegs.I2CCNT = 3;            // 3 Additional Bytes being 
tranferred.
    I2caRegs.I2CDXR = Register;     // Send Register to be updated.
    I2caRegs.I2CDXR = Byte1;        // Next is high byte of register.
    I2caRegs.I2CDXR = Byte0;        // Next is low byte of register.

    I2caRegs.I2CMDR.all = 0x6E20;
}

void I2CA_Wait(void)
{

    while (I2caRegs.I2CMDR.bit.STP == 1); // Wait for Stop condition bit 
to be zero.

        while (I2caRegs.I2CSTR.bit.BB == 1);  // Wait for Bus Busy to be 
zero.

    }
    interrupt void i2c_int1a_isr(void)     // I2C-A
    {
        Uint16 IntSource;

       // Read interrupt source
        IntSource = I2caRegs.I2CISRC.bit.INTCODE & 0x7;

        switch(IntSource)
        {
            case I2C_NO_ISRC:   // =0
                break;

            case I2C_ARB_ISRC:  // =1
                break;

            case I2C_NACK_ISRC: // =2
                break;

            case I2C_ARDY_ISRC: // =3
                break;

            case I2C_RX_ISRC:   // =4
                InData[I2cIndex++] = I2caRegs.I2CDRR;
                break;

            case I2C_TX_ISRC:   // =5
                break;

            case I2C_SCD_ISRC:  // =6
                break;

            case I2C_AAS_ISRC:  // =7
                break;

            default:
                asm("   ESTOP0"); // Halt on invalid number.
        }

       // Enable future I2C (PIE Group 8) interrupts
        PieCtrlRegs.PIEACK.all = PIEACK_GROUP8;
    }

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