S3C2440 I2C总线控制

概述：话不多说,直接上图

多主机IIC总线控制(IICCON):

IIC控制总线状态(IICSTAT):

IIC总线地址(IICADD):

IIC发送,接收总线寄存器(IICDS)

IIC总线控制寄存器：

源码如下:

void Rd24C080(U32 slvAddr,U32 addr,U8 *data)
{
 _iicMode      = SETRDADDR;
 _iicPt        = 0;
 _iicData[0]   = (U8)addr;
 _iicDataCount = 1;

rIICDS   = slvAddr;
 rIICSTAT = 0xf0;                    //MasTx,Start 
 //Clearing the pending bit isn't needed because the pending bit has been cleared.
 while(_iicDataCount!=-1);

_iicMode      = RDDATA;
 _iicPt        = 0;
 _iicDataCount = 1;
   
 rIICDS        = slvAddr;
 rIICSTAT      = 0xb0;               //MasRx,Start
 rIICCON       = 0xaf;               //Resumes IIC operation.  
 while(_iicDataCount!=-1);

*data = _iicData[1];
}

void Wr24C080(U32 slvAddr,U32 addr,U8 data)
{
 _iicMode      = WRDATA;
 _iicPt        = 0;
 _iicData[0]   = (U8)addr;
 _iicData[1]   = data;
 _iicDataCount = 2;
   
 rIICDS   = slvAddr;                 //0xa0
 rIICSTAT = 0xf0;                    //MasTx,Start
 //Clearing the pending bit isn't needed because the pending bit has been cleared.
   
 while(_iicDataCount!=-1);

_iicMode = POLLACK;

while(1)
 {
  rIICDS     = slvAddr;
  _iicStatus = 0x100;
  rIICSTAT   = 0xf0;              //MasTx,Start
  rIICCON    = 0xaf;              //Resumes IIC operation.
          
  while(_iicStatus==0x100);
          
  if(!(_iicStatus&0x1))
   break;                      //When ACK is received
 }
 rIICSTAT = 0xd0;                    //Stop MasTx condition
 rIICCON  = 0xaf;                    //Resumes IIC operation.
 Delay(1);                           //Wait until stop condtion is in effect.
 //Write is completed.
}

void Test_Iic(void)
{
 unsigned int i,j,save_E,save_PE;
 static U8 data[256];

Uart_Printf("\nIIC Test(Interrupt) using AT24C02\n");

save_E   = rGPECON;
 save_PE  = rGPEUP;
 rGPEUP  |= 0xc000;                  //Pull-up disable
 rGPECON |= 0xa00000;                //GPE15:IICSDA , GPE14:IICSCL

pISR_IIC = (unsigned)IicInt;
 rINTMSK &= ~(BIT_IIC);

//Enable ACK, Prescaler IICCLK=PCLK/16, Enable interrupt, Transmit clock value Tx clock=IICCLK/16
 // If PCLK 50.7MHz, IICCLK = 3.17MHz, Tx Clock = 0.198MHz
 rIICCON = (1<<7) | (0<<6) | (1<<5) | (0xf);

rIICADD  = 0x10;                    //2440 slave address = [7:1]
 rIICSTAT = 0x10;                    //IIC bus data output enable(Rx/Tx)
 rIICLC = (1<<2)|(1);      // Filter enable, 15 clocks SDA output delay       added by junon
   
 Uart_Printf("Write test data into AT24C02\n");

for(i=0;i<256;i++)
  Wr24C080(0xa0,(U8)i,i);
          
 for(i=0;i<256;i++)
  data[i] = 0;

Uart_Printf("Read test data from AT24C02\n");
   
 for(i=0;i<256;i++)
  Rd24C080(0xa0,(U8)i,&(data[i]));

//Line changed 0 ~ f
 for(i=0;i<16;i++)
 {
  for(j=0;j<16;j++)
   Uart_Printf("%2x ",data[i*16+j]);
  Uart_Printf("\n");
 }
 rINTMSK |= BIT_IIC;   
 rGPEUP  = save_PE;
 rGPECON = save_E;
}

void main()

{

Test_Iic();

}