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();
}