i2c模块程序哪里出错了

只看该作者 · 2014-7-24 08:17

程序的功能是给24c02 第0x00个字节写入0x20,然后再读回到变量b中
#include "DSP28x_Project.h"

#define I2C_SLAVE_ADDR       0x50
#define I2C_NUMBYTES 15
#define I2C_EEPROM_HIGH_ADDR  0x00
#define I2C_EEPROM_LOW_ADDR 0x00
void  I2CA_SendData(void);
void  I2CA_ReceiveData(void);

void main(void)

{

      InitSysCtrl();
      InitI2CGpio();
      DINT;
      InitPieCtrl();

      IER = 0xffff;
      IFR = 0x0000;

      InitPieVectTable();
      InitI2C();
      I2CA_SendData();
      I2CA_ReceiveData();
      while(1);
}

void  I2CA_SendData(void)
{
      Uint16 i;
I2caRegs.I2CSAR = I2C_SLAVE_ADDR;                      //Set slave address
I2caRegs.I2CCNT = 1 + 1;                      //Set count to 5 characters plus 2 address bytes
I2caRegs.I2CDXR = 0x02;//Send eeprom high address
I2caRegs.I2CMDR.bit.TRX = 1;                               //Set to Transmit mode
I2caRegs.I2CMDR.bit.MST = 1;                               //Set to Master mode
I2caRegs.I2CMDR.bit.FREE = 1;                               //Run in FREE mode
I2caRegs.I2CMDR.bit.STP = 1;                               //Stop when internal counter becomes 0
I2caRegs.I2CMDR.bit.STT = 1;                               //Send the start bit, transmission will follow

while(I2caRegs.I2CSTR.bit.XRDY == 0);                //Do nothing till data is shifted out
I2caRegs.I2CDXR = 0x20;                         //Send eeprom low address
}

void  I2CA_ReceiveData(void)
{
      Uint16 i;
      char b[20];
      b[0]=0;
I2caRegs.I2CSAR = I2C_SLAVE_ADDR;                      //Set slave address
I2caRegs.I2CCNT = 1;                                              //Set count to 2 address bytes
I2caRegs.I2CDXR = 0x00;                      //Send eeprom high address
I2caRegs.I2CMDR.bit.TRX = 1;                               //Set to Transmit mode
I2caRegs.I2CMDR.bit.MST = 1;                               //Set to Master mode
I2caRegs.I2CMDR.bit.FREE = 1;                               //Run in FREE mode
I2caRegs.I2CMDR.bit.STP = 0;                               //Dont release the bus after Tx
I2caRegs.I2CMDR.bit.STT = 1;                               //Send the start bit, transmission will follow

I2caRegs.I2CCNT = 1;                               //read 5 bytes from eeprom
I2caRegs.I2CMDR.bit.TRX = 0;                               //Set to Recieve mode
I2caRegs.I2CMDR.bit.MST = 1;                               //Set to Master mode
I2caRegs.I2CMDR.bit.FREE = 1;                               //Run in FREE mode
I2caRegs.I2CMDR.bit.STP = 1;                               //Stop when internal counter becomes 0
I2caRegs.I2CMDR.bit.STT = 1; //Repeated start, Reception will follow
b[0] = I2caRegs.I2CDRR;
while(1);
}
void InitI2C(void)
{
// Initialize I2C-A:
      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.bit.ARDY = 0;
      I2caRegs.I2CIER.bit.XRDY = 0;
      I2caRegs.I2CFFTX.all = 0x0000; // Disable FIFO mode and TXFIFO
      I2caRegs.I2CFFRX.all = 0x0000; // Disable RXFIFO, clear RXFFINT,

      I2caRegs.I2CMDR.all = 0x0020; // Take I2C out of reset
                                          // Stop I2C when suspended

}