2410iic.c

文档中包括S3C2410基础试验中VGA显示（ADS)中调试通过的源代码

#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;

//===================================================================
//       SMDK2410 IIC configuration
//  GPE15=IICSDA, GPE14=IICSCL
//  "Interrupt mode" for IIC block
//=================================================================== 

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

    Uart_Printf("[ IIC Test(Interrupt) using KS24C080 ]\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;                    //2410 slave address = [7:1]
    rIICSTAT = 0x10;                    //IIC bus data output enable(Rx/Tx)

    Uart_Printf("Write test data into KS24C080\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 KS24C080\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 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);


/*
    _iicMode = POLLACK;

    while(1)
    {
        rIICDS     = slvAddr;
        _iicStatus = 0x100;
        rIICCON    = 0xe0;              //Resumes IIC operation. 
        rIICSTAT   = 0xf0;              //MasTx,Start
           
        while(_iicStatus==0x100);
           
        if(!(_iicStatus&0x1))
            break;                      //When ACK is received
    }
    rIICSTAT = 0xd0;                    //Stop MasTx condition 
    rIICCON  = 0xe0;                    //Resumes IIC operation. 
    Delay(1);                           //Wait until stop condtion is in effect.
    
     //Write is completed.
*/


}



//*************************[ Wr24C080 ]****************************
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    = 0xe0;              //Resumes IIC operation. 
           
        while(_iicStatus==0x100);
           
        if(!(_iicStatus&0x1))
            break;                      //When ACK is received
    }
    rIICSTAT = 0xd0;                    //Stop MasTx condition 
    rIICCON  = 0xe0;                    //Resumes IIC operation. 
    Delay(1);                           //Wait until stop condtion is in effect.
       //Write is completed.
}
        
//**********************[ Rd24C080 ] ***********************************
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       = 0xe0;               //Resumes IIC operation.   
    while(_iicDataCount!=-1);

    *data = _iicData[1];
}


//-------------------------------------------------------------------------
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;