iic.c.bak

S3C44BOX的BIOS。可使用的命令：help --- show help ? --- = help date --- show or set current date time --

#include <string.h>
#include "../inc/44b.h"
#include "../inc/44blib.h"
#include "../inc/def.h"
#include "../inc/iic.h"

#define WRDATA	    (1)
#define POLLACK     (2)
#define RDDATA	    (3)
#define SETRDADDR   (4)

#define IICBUFSIZE 0x20

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


void Init_Iic(void)
{

    rPCONF |=0xa;	//PF0:IICSCL, PF1:IICSDA
    rPUPF |=0x3;	//pull-up disable


    rIICCON=(1<<7)|(0<<6)|(1<<5)|(0xf);
    //Enable interrupt, IICCLK=MCLK/16, Enable ACK
    //60Mhz/16/(15+1) = 257Khz	
    rIICADD=0x10;   // S3C44B0X slave address

    rIICSTAT=0x10;

}


void Wr24LCxx(U32 slvAddr,U32 addr,U8 data)
{
    
    U32 iicSt;
   
    rIICDS = slvAddr;//0xa0
    rIICSTAT=0xf0; //MasTx,Start
    while(1){
	iicSt=rIICSTAT;
	if(iicSt&0x01)
		break;	//waitting the ACK
    }
    rIICDS=addr;
    iicSt = rIICCON & 0xef;
    rIICCON = iicSt;		//Clear pending bit
    while(1){
	iicSt=rIICSTAT;
	if(iicSt&0x01)
		break;	//waitting the ACK
    }    rIICDS=data;
    iicSt = rIICCON & 0xef;
    rIICCON = iicSt;		//Clear pending bit	
    while(1){
	iicSt=rIICSTAT;
	if(iicSt&0x01)
		break;	//waitting the ACK
    }    rIICSTAT=0xd0;  //stop MasTx condition
    iicSt = rIICCON & 0xef;
    rIICCON = iicSt;		//Clear pending bit
 
    Delay(1);	    //wait until stop condtion is in effect.

    //write is completed.
}
	

void Rd24LCxx(U32 slvAddr,U32 addr,U8 *data)
{
    U32 iicSt;
   
    rIICDS = slvAddr;//0xa0
    rIICSTAT=0xf0; //MasTx,Start
    while(1){
	iicSt=rIICSTAT;
	if(iicSt&0x01)
		break;	//waitting the ACK
    }    rIICDS=addr;
    iicSt = rIICCON & 0xef;
    rIICCON = iicSt;		//Clear pending bit
    while(1){
	iicSt=rIICSTAT;
	if(iicSt&0x01)
		break;	//waitting the ACK
    }
    iicSt = rIICCON & 0xef;
    rIICCON = iicSt;		//Clear pending bit
    rIICDS=slvAddr;
    rIICSTAT=0xb0; //MasRx,Start
    while(1){
	iicSt=rIICSTAT;
	if(iicSt&0x01)
		break;	//waitting the ACK
    }    
    Delay(1);
    while(1){
	iicSt=rIICSTAT;
	if(!(iicSt&0x01))
		break;	//waitting the ACK
    }    rIICSTAT=0xd0;  //stop MasTx condition
    iicSt = rIICCON & 0xef;
    rIICCON = iicSt;		//Clear pending bit
     
    *data = rIICDS;

}