24lcxx.c

AD7843在ADS1.2环境下的一个驱动程序

#include "24LCXX.h"
#include "44b.h"

	//Wr24LCxx(0xa0,04,0x55);
	//Rd24LCxx(0xa0,04,&DAT3);

void IIC_Init(void)
{
	rPCONF &= ~0x0f;
	rPCONF |= 0x0a;
	rPDATF |= 0x03;
	rPUPF |= 0x03;
	
    rIICCON=(1<<7)|(1<<6)|(1<<5)|(0x1F);
    //Enable interrupt, IICCLK=MCLK/16, Enable ACK
    //66Mhz/16/(15+1) = 257Khz	
    rIICADD=0x10;   // S3C44B0X slave address
    rIICSTAT=0x10;
}

void Wr24LCxx(unsigned int slvAddr,unsigned int addr,unsigned char data)
{
    int i;
    //==========================
    rIICDS=slvAddr;//0xa0
    rIICSTAT=0xF0; //MasTx,Start
    while( !(rINTPND & BIT_IIC) );
    rI_ISPC = BIT_IIC;
    //==========================
    rIICDS = (unsigned char)addr;
    for(i=0;i<10;i++);
    rIICCON=0xAF;
    while( !(rINTPND & BIT_IIC) );
    rI_ISPC = BIT_IIC;
    //=========================
    rIICDS = (unsigned char)data;
    for(i=0;i<10;i++);
    rIICCON=0xAF;
    while( !(rINTPND & BIT_IIC) );
    rI_ISPC = BIT_IIC;
    //=========================
    rIICSTAT=0xD0;	//stop MasTx condition 
    rIICCON=0xAF;	//resumes IIC operation.
    for( i = 0 ; i < 2560 ; i++ );	//wait until stop condtion is in effect.
    while(1)
    {
	    rIICDS=slvAddr;
       rIICSTAT=0xf0; //MasTx,Start
	    rIICCON=0xaf;  //resumes IIC operation. 
       while( !(rINTPND & BIT_IIC) );
       rI_ISPC = BIT_IIC;
	    if(!(rIICSTAT&0x1))
	    break; // when ACK is received
    }
    rIICSTAT =0xD0;  //stop MasTx condition 
    rIICCON =0xAF;   //resumes IIC operation. 
    for( i = 0 ; i < 2560 ; i++ );
}
unsigned char Rd24LCxx(unsigned int slvAddr,unsigned int addr)
{
    int i;
	unsigned char data;

    rIICDS=slvAddr;
    rIICSTAT=0xf0; //MasTx,Start  
    //Clearing the pending bit isn't needed because the pending bit has been cleared.
    while( !(rINTPND & BIT_IIC) );
    rI_ISPC = BIT_IIC;

    //==========================
    rIICDS = (unsigned char)addr;
    for(i=0;i<10;i++);
    rIICCON=0xAF;

    while( !(rINTPND & BIT_IIC) );
    rI_ISPC = BIT_IIC;

    //================================
    rIICDS=slvAddr;
    rIICSTAT=0xb0; //MasRx,Start
    rIICCON=0xaf;  //resumes IIC operation.   

    while( !(rINTPND & BIT_IIC) );
    rI_ISPC = BIT_IIC;

    //=============================
    rIICCON = 0x2f;

    while( !(rINTPND & BIT_IIC) );
    rI_ISPC = BIT_IIC;

    //============================
	 data = rIICDS;
	    
	 rIICSTAT=0x90;  //stop MasRx condition 
	 rIICCON=0xaf;   //resumes IIC operation.
	for( i = 0 ; i < 256 ; i++ );	//wait until stop condtion is in effect.
	return data;
}