iic.c

44B0+8019系统

#include "..\inc\44b.h"
#include "iic.h"

//rINTPND
//BIT_IIC


void Iic_Init()
{
    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++ );
    //write is completed.
}
	

void Rd24LCxx(unsigned int slvAddr,unsigned int addr,unsigned char *data)
{
    int i;

    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.
}