i2c.c

TMS320F2808 DSP芯片的接口控制源码

#include "DSP280x_Device.h"     // DSP280x Headerfile Include File
#include "DSP280x_Examples.h"   // DSP280x Examples Include File

void   	SendData(Uint16	num,Uint16	data);
void   	I2CA_Init(void);
Uint16 	ReadData(Uint16  *RamAddr, Uint16	RomAddress, Uint16 number);
Uint16 	WriteData(Uint16	*Wdata, Uint16	RomAddress, Uint16	number);

Uint16	I2C_xrdy();
Uint16	I2C_rrdy();

void main(void)
{
	Uint16   dat1[8]={0,0,0,0,0,0,0,0};
	Uint16   dat[]={ 0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88};

    InitSysCtrl();

 	InitGpio();  

	SetCs(1);
	SetCs(0);
	InitI2C();
    DINT;
 
    InitPieCtrl();
   
    IER = 0x0000;
    IFR = 0x0000;

    InitPieVectTable();
	SendData(0,0xFF);
	SendData(1,0xFF);
	WriteData(dat,0x60,8);
	DELAY_US(10000);
	ReadData(dat1,0x60,8);
	for(;;);
}
 
Uint16 WriteData(Uint16	*Wdata, Uint16	RomAddress, Uint16	number)
{
   Uint16 i;
   if (I2caRegs.I2CSTR.bit.BB == 1)
   {
      return I2C_BUS_BUSY_ERROR;
   }
   while(!I2C_xrdy());
   I2caRegs.I2CSAR = 0x50;
   I2caRegs.I2CCNT = number + 1;
   I2caRegs.I2CDXR = RomAddress;
   I2caRegs.I2CMDR.all = 0x6E20;
   for (i=0; i<number; i++)
   {
      while(!I2C_xrdy());
      I2caRegs.I2CDXR = *Wdata;
      Wdata++;
	  if (I2caRegs.I2CSTR.bit.NACK == 1)
   		  return	I2C_BUS_BUSY_ERROR;
   }   	
   return I2C_SUCCESS;   
}

Uint16 ReadData(Uint16  *RamAddr, Uint16	RomAddress, Uint16 number)
{
   Uint16  i,Temp;

   if (I2caRegs.I2CSTR.bit.BB == 1)
   {
       return I2C_BUS_BUSY_ERROR;
   }
   while(!I2C_xrdy());
   I2caRegs.I2CSAR = 0x50;
   I2caRegs.I2CCNT = 1;
   I2caRegs.I2CDXR = RomAddress;
   I2caRegs.I2CMDR.all = 0x6620; 
   if (I2caRegs.I2CSTR.bit.NACK == 1)
   		return	I2C_BUS_BUSY_ERROR;
   DELAY_US(50);		
   while(!I2C_xrdy());
   I2caRegs.I2CSAR = 0x50;
   I2caRegs.I2CCNT = number;	 
   I2caRegs.I2CMDR.all = 0x6C20; 
   if (I2caRegs.I2CSTR.bit.NACK == 1)
   		return	I2C_BUS_BUSY_ERROR;
   for(i=0;i<number;i++)
   {
      while(!I2C_rrdy());
   	  Temp = I2caRegs.I2CDRR;
	  if (I2caRegs.I2CSTR.bit.NACK == 1)
   		  return	I2C_BUS_BUSY_ERROR;
   	  *RamAddr = Temp;
   	  RamAddr++;
   }
   return I2C_SUCCESS;
}


Uint16	I2C_xrdy()
{
	Uint16	t;
	t = I2caRegs.I2CSTR.bit.XRDY;
	return t;
}

Uint16	I2C_rrdy()
{
	Uint16	t;
	t = I2caRegs.I2CSTR.bit.RRDY;
	return t;
}

//===========================================================================
// No more.
//===========================================================================