2410iic.c

s3c2410的VGA测试源码程序。希望对大伙有帮助！

//====================================================================
// File Name : 2410IIC.c
// Function  : S3C2410 IIC-bus Master Tx/Rx mode Test Program
//             (Interrupt / Non Interrupt (Polling))
// Program   : Shin, On Pil (SOP)
// Date      : May 21, 2002
// Version   : 0.0
// History
//   0.0 : Programming start (March 11, 2002) -> SOP
//====================================================================

#include <string.h>
#include "2410addr.h"
#include "2410lib.h"
#include "def.h"
#include "2410IIC.h"

static U8 _iicData[IICBUFSIZE];
static volatile int _iicDataCount;
static volatile int _iicStatus;
static volatile int _iicMode;
static int _iicPt;


//-------------------------------------------------------------------------
void __irq IicInt(void)
{
    U32 iicSt,i;
    
    rSRCPND = BIT_IIC;          //Clear pending bit
    rINTPND = BIT_IIC;
    iicSt   = rIICSTAT; 
    
    if(iicSt & 0x8){}           //When bus arbitration is failed.
    if(iicSt & 0x4){}           //When a slave address is matched with IICADD
    if(iicSt & 0x2){}           //When a slave address is 0000000b
    if(iicSt & 0x1){}           //When ACK isn't received

    switch(_iicMode)
    {
       case POLLACK:
           _iicStatus = iicSt;
           break;

       case RDDATA:
           if((_iicDataCount--)==0)
           {
               _iicData[_iicPt++] = rIICDS;
            
               rIICSTAT = 0x90;                 //Stop MasRx condition 
               rIICCON  = 0xe0;                 //Resumes IIC operation.
               Delay(1);                        //Wait until stop condtion is in effect.
                                                //Too long time... 
                                                //The pending bit will not be set after issuing stop condition.
               break;    
           }      
           _iicData[_iicPt++] = rIICDS;         //The last data has to be read with no ack.

           if((_iicDataCount)==0)
               rIICCON = 0x2f;                  //Resumes IIC operation with NOACK.  
           else 
               rIICCON = 0xe0;                  //Resumes IIC operation with ACK
               break;

        case WRDATA:
            if((_iicDataCount--)==0)
            {
                rIICSTAT = 0xd0;                //Stop MasTx condition 
                rIICCON  = 0xe0;                //Resumes IIC operation.
                Delay(1);                       //Wait until stop condtion is in effect.
                       //The pending bit will not be set after issuing stop condition.
                break;    
            }
            rIICDS = _iicData[_iicPt++];        //_iicData[0] has dummy.
            for(i=0;i<10;i++);                  //for setup time until rising edge of IICSCL
              
            rIICCON = 0xe0;                     //resumes IIC operation.
            break;

        case SETRDADDR:
//            Uart_Printf("__irq IicInt SETDADDR [ S%d ]",_iicDataCount);
            if((_iicDataCount--)==0)
                break;                          //IIC operation is stopped because of IICCON[4]    
            rIICDS = _iicData[_iicPt++];
            for(i=0;i<10;i++);                  //For setup time until rising edge of IICSCL
            rIICCON = 0xe0;                     //Resumes IIC operation.
            break;

        default:
            break;      
    }
}



//===================================================================
//       SMDK2410 IIC configuration
//  GPE15=IICSDA, GPE14=IICSCL
//  "Interrupt mode" for IIC block
//=================================================================== 
void IicSetCh7004(void)
{
    unsigned int i,j,save_E,save_PE;

    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);

      //Enable ACK, Prescaler IICCLK=PCLK/256, Enable interrupt, Transmit clock value Tx clock=IICCLK/1
      // If PCLK 50.7MHz, IICCLK = 0.99MHz, Tx Clock = 99KHz
    rIICCON = (1<<7) | (1<<6) | (1<<5) | (0x0);


    rIICADD  = 0x10;                    //2410 slave address = [7:1]
    rIICSTAT = 0x10;                    //IIC bus data output enable(Rx/Tx)

    Uart_Printf("Write control data into ch7004\n");
    
    //CH7004 slave addr[7..1]--0x76     [0]--1  RW
    WrCh7004(0xec,(U8)0x84,0x20);
   

    //Write is completed.
    Uart_Printf("Write is completed\n");    
    
    rINTMSK |= BIT_IIC;    
    rGPEUP  = save_PE;
    rGPECON = save_E;
    
}
//*************************[ Wr7004 ]****************************
void WrCh7004(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);
}