i2c_24wc02_rw.c

C51编写的通过I2C对24C02读写试验

#include "reg51.h"
#include "VI2C_C51.h"

#define uchar unsigned char
extern bit ack;

uchar *ww;
uchar ee[10];
sbit SendState=P0^0;
sbit ReadState=P0^1;

bit NSend(uchar sla, uchar suba, uchar *a, uchar no);
bit NRead(uchar sla, uchar suba, uchar *a, uchar no);
void delay();

main()
{
	bit ret1, ret2;
	int j;
	ww=ee;	
	for(j=0;j<10;j++)
	{
	ww[j]=j;
	}
	ret1=NSend(0xA0, 0x00, "0123456789",10);
	delay();
	ret2=NRead(0xA0, 0x00, ww, 10);
	SendState=ret1;
	ReadState=ret2;

	while(1){
	P2=ww[0];
	delay();
	delay();
	P2=ww[1];
	delay();
	delay();
	P2=ww[2];
	delay();
	delay();
	P2=ww[3];
	delay();
	delay();
	P2=ww[4];
	delay();
	delay();
	P2=ww[5];
	delay();
	delay();
	P2=ww[6];
	delay();
	delay();
	P2=ww[7];
	delay();
	delay();}
}

void delay()
{
	int i=0;
	while(i<20000) i++;
	i=0;
	while(i<20000) i++;
	i=0;
	while(i<20000) i++;
	i=0;
	while(i<20000) i++;
}

bit NSend(uchar sla, uchar suba, uchar *a, uchar no)
{
	uchar i;
	Start_I2c();
	SendByte(sla);
	if(ack==0) return (0);
	SendByte(suba);
	if(ack==0) return (0);
	for(i=0;i<no;i++)
	{
		SendByte(*a);
		if(ack==0)return(0);
		a++;
	}
   Stop_I2c();
   return(1);
}

bit NRead(uchar sla, uchar suba, uchar *a, uchar no)
{
	uchar i;
	Start_I2c();
	SendByte(sla);
	if(ack==0) return (0);
	SendByte(suba);
	if(ack==0) return (0);
	Start_I2c();
	SendByte(sla+1);
	if(ack==0) return (0);
	for(i=0;i<no-1;i++)
	{
		*a = RcvByte();
		Ack_I2c(0);
		a++;
	}
	*a = RcvByte();
	Ack_I2c(1);
   Stop_I2c();
   return(1);
}