iic.c

本程序主要是是s3c2410关于iic总线对rtc时钟的控制。开发环境是ads1.2

//====================================================================
// 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 "def.h"
#include "2410addr.h"
#include "2410lib.h"
#include "2410slib.h"
#include "IIC.h"

#define WRITE_ADDRESS				0xA2
#define READ_ADDRESS				0xA3

#define BCD_TO_BIN(val) (((val)&0x0F) + ((val)>>4)*10)
#define BIN_TO_BCD(val) ((((val)/10)<<4) + (val)%10)

#define TWELVE_HOUR_MODE(n)	(((n)>>6)&1)
#define HOURS_AP(n)		(((n)>>5)&1)
#define HOURS_12(n)		BCD_TO_BIN((n)&0x1F)
#define HOURS_24(n)		BCD_TO_BIN((n)&0x3F)

char *monthstr[12]={
                 "Jan","Feb","Mar","Apr","May","Jun",
                 "Jul","Aug","Sep","Oct","Nov","Dec"
                };

char *weekstr[7]={"Sunday","Monday", "Tuesday", "Wednesday", "Tursday", "Friday", "Saturday"};

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

void Wr8563(U32 slvAddr,U32 addr,U8 data);
void Rd8563(U32 slvAddr,U32 addr,U8 *data);
//===================================================================
//       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, sel, k;
    static U8 data[256];
    unsigned char *buffer;
    int sec, min, hou, day, dow, mon, yea;
    char t;
    
    Uart_Printf("\nIIC RTC Test using PCF8563\n");

    save_E   = rGPECON;
    save_PE  = rGPEUP;
    rGPEUP  |= 0xc000;                  //Pull-up disable
    rGPECON &= ~0xf0000000;
    rGPECON |= 0xa0000000;              //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);
    //IIC clock = PCLK/(512*1)
    rIICCON = (1<<7) | (1<<6) | (1<<5) | (0);	//hzh

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

	//Uart_Printf("Write test data into AT24C02\n");
	Uart_Printf("Do you want to reset the time on 2006-06-06 06:06:06 (Y or N)? \n");
	t = getch();
	if((t=='Y') || (t=='y')){
		
			data[2] = BIN_TO_BCD(0x06); 
			data[3] = BIN_TO_BCD(0x06); 
			data[4] = BIN_TO_BCD(0x06); 
			data[5] = BIN_TO_BCD(0x06); 
			data[6] = BIN_TO_BCD(0x02); 
			data[7] = BIN_TO_BCD(0x06); 
			data[8] = BIN_TO_BCD(0x06);
		for(i=2; i<9; i++)
			Wr8563(0xa2,(U8)i,data[i]);
			
		Uart_Printf("RTC time is reseted ! \n");
	}
	
    for(;;){
    	for(i=2;i<9;i++)
        	Rd8563(0xa3,(U8)i,&(data[i])); 

 		sec = BCD_TO_BIN(data[2]&0x7f);
		min = BCD_TO_BIN(data[3]&0x7f);
		hou = BCD_TO_BIN(data[4]&0x3f);
		day = BCD_TO_BIN(data[5]&0x3f);
 		dow = BCD_TO_BIN(data[6]&0x07);
		mon = BCD_TO_BIN(data[7]&0x1f);
		yea = BCD_TO_BIN(data[8]);
	
	
		Uart_Printf("Now is =    ' %d-%s-200%d  %2d:%2d:%2d   %s '\n", 
				day, monthstr[mon-1], yea, hou, min, sec, weekstr[dow]); 	
				
		if(Uart_GetKey() == ESC_KEY) break;
		
		Delay(10000);
	}

    rINTMSK |= BIT_IIC;    
    rGPEUP  = save_PE;
    rGPECON = save_E;
}


//*************************[ Wr24C080 ]****************************
void Wr8563(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;//0xaf;              //Resumes IIC operation. 	//hzh
           
        while(_iicStatus==0x100);
           
        if(!(_iicStatus&0x1))
            break;                      //When ACK is received
    }
    rIICSTAT = 0xd0;                    //Stop MasTx condition 
    rIICCON  = 0xe0;//0xaf;                    //Resumes IIC operation. 	//hzh
    Delay(1);                           //Wait until stop condtion is in effect.
       //Write is completed.
}
        
//**********************[ Rd24C080 ] ***********************************
void Rd8563(U32 slvAddr,U32 addr,U8 *data)
{
    
    _iicMode      = SETRDADDR;  //先写地址
    _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);   //写地址完毕

    _iicMode      = RDDATA;
    _iicPt        = 0;
    _iicDataCount = 1;
    
    rIICDS        = slvAddr;
    rIICSTAT      = 0xb0;               //MasRx,Start
    rIICCON       = 0xe0;//0xaf;               //Resumes IIC operation.	//hzh
    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;
            
               rIICSTAT = 0x90;                 //Stop MasRx condition 
               rIICCON  = 0xe0;//0xaf;                 //Resumes IIC operation.	//hzh
               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 = 0x60;//0x2f;                  //Resumes IIC operation with NOACK.	//hzh
           else 
               rIICCON = 0xe0;//0xaf;                  //Resumes IIC operation with ACK	//hzh