#include"STC15.H"

#define ADDR24C02 0x50
#define R 1
#define W 0

sbit SCL=P3^4;
sbit SDA=P3^5;

sbit feleer=P3^3;         //探针

struct dats
{
    unsigned char dats[16];
};

unsigned char dats[2]="A";

struct dats Read_Dats(unsigned char addr_dive,unsigned char addr_word);
void Write_Dats(unsigned char addr_dive,unsigned char addr_word,unsigned char *dats);
void Start();
void Stop();
bit Addr_Dive(unsigned char addr_dive);
bit Addr_Word(unsigned char addr_word);
unsigned char Read();
void Write(unsigned char dat);
bit ACK();
void NACK();
void Delay();
void Feleer();

void main()
{
    struct dats dats;

    Init_IO();
    Write_Dats(ADDR24C02,0x00,dats);
    Delay();
    Feleer();      //这里会闪
    Write_Dats(ADDR24C02,0x01,dats);
    Delay();
    Feleer();      //这里不闪，运行不到这里
    Read_Dats(ADDR24C02,0x00);
    if(dats.dats[0]=='A')
    {
        ......
    }

    while(1);
}

void Init_IO()
{
    P3M1=0x30;
    P3M0=0x30;
}

struct dats Read_Dats(unsigned char addr_dive,unsigned char addr_word)
{
    struct dats dats;
    bit ack;
    unsigned char i;
    unsigned char num=1;

    Start();
    do
    {
        ack=Addr_Dive(addr_dive<<1|W);
    }
    while(ack!=0);
    do
    {
        ack=Addr_Word(addr_word);
    }
    while(ack!=0);
    do
    {
        ack=Addr_Dive(addr_dive<<1|R);
    }
    while(ack!=0);
    for(i=0;i<num;i++)
    {
        dats.dats[i]=Read();
    }
    NACK();
    Stop();

    return(dats);
}

void Write_Dats(unsigned char addr_dive,unsigned char addr_word,unsigned char *dats)
{
    bit ack=0;
    unsigned char *ptr=dats;

    Start();
    do
    {
        ack=Addr_Dive(addr_dive);
    }
    while(ack!=0);
    do
    {
        ack=Addr_Dive(addr_word);
    }
    while(ack!=0);
    while(*ptr!=0)
    {
        do
        {
            Write(*ptr);
            ack=ACK();
        }
        while(ack!=0);
        ptr++;
    }
    Stop();
}

void Start()
{
    SDA=1;
    Delay();
    SCL=1;
    Delay();
    SDA=0;
    Delay();
    SCL=0;
}

void Stop()
{
    SDA=0;
    Delay();
    SCL=1;
    Delay();
    SDA=1;
    Delay();
    SCL=0;
}

bit Addr_Dive(unsigned char addr_dive)
{
    bit ack=0;

    Write(addr_dive);
    ack=ACK();

    return(ack);
}

bit Addr_Word(unsigned char addr_word)
{
    bit ack;

    Write(addr_word);
    ack=ACK();

    return(ack);
}

unsigned char Read()
{
    unsigned char i;
    unsigned char dat=0;

    SDA=1;
    for(i=0;i<8;i++)
    {
        SCL=1;
        Delay();
        dat=(dat<<1)|SDA;
        SCL=0;
    }

    return(dat);
}

void Write(unsigned char dat)
{
    unsigned char i;

    for(i=0;i<8;i++)
    {
        if(dat&(0x80>>i))
        {
            SDA=1;
        }
        else
        {
            SDA=0;
        }
        Delay();
        SCL=1;
        Delay();
        SCL=0;
    }
}

bit ACK()
{
    bit ack=0;

    SDA=1;
    Delay();
    SCL=1;
    Delay();
    if(SDA==1)
    {
        ack=1;
    }
    SCL=0;

    return(ack);
}

void NACK()
{
    SDA=1;
    Delay();
    SCL=1;
    Delay();
    SCL=0;
    Delay();
    SDA=0;
}

void Delay()
{
    ;
}

void Feleer()
{
    unsigned int i;

    for(i=0;i<24000;i++)
    {
        if(i%6000==0)
        {
            feleer=~feleer;
        }
    }   
}

这是我昨天写的IIC测试程序，不懂得怎么回事，同样的函数只能运行1次，写数据第一次后，再读或再写都不成功了。用的是STC15W104单片机：



哪位高手帮我看一下，问题出在哪里？谢谢!!!

[此贴子已经被作者于2020-4-4 14:33编辑过]