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標(biāo)題: I2C的程序不能實(shí)現(xiàn)？？？ [打印本頁]

作者: crytail 時(shí)間: 2014-2-22 21:03
標(biāo)題: I2C的程序不能實(shí)現(xiàn)？？？
哪位大神知道為什么嗎？我的程序在理論沒錯(cuò)誤啊！怎么實(shí)現(xiàn)不了它的功能？？？

# include <reg52.h>
# include "intrins.h"
//# include "I2C_driver.h"

#define  AT24C02 0xa0  //AT24C02 地址

sbit LS138A=P2^2;    //譯碼器端
sbit LS138B=P2^3;
sbit LS138C=P2^4;

sbit K1 = P1^0;    //保存
sbit K2 = P1^1;    //讀取
sbit K3 = P1^2;    //+數(shù)據(jù)
sbit K4 = P1^3; //-數(shù)據(jù)

unsigned char code Disp_Tab[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40};

unsigned char Count1;
unsigned long D[17], LedOut[4];
unsigned int idata USEC;

typedef unsigned int uint;
typedef unsigned char uchar;

sbit SCL = P2^1;
sbit SDA = P2^0;

bit ack;    //應(yīng)答;1發(fā)送正常

/*                   4us延時(shí)                */
void delay()
{
_nop_(); _nop_();
_nop_();    _nop_();
_nop_(); _nop_();
}

  /*             I2C啟動(dòng)信號(hào)                */
void I2C_Start()
{
SDA = 1;
_nop_();
SCL = 1;    //在SCL高電平的期間，SDA高到低
delay();
_nop_();
SDA = 0;
delay();
SCL=0;    /*鉗住I2C總線，準(zhǔn)備發(fā)送或接收數(shù)據(jù) */
_nop_();
_nop_();
}

  /*             I2C終止信號(hào)                */
void I2C_Stop()
{
SDA = 0;
_nop_();
SCL = 1;    //在SCL高電平的期間，SDA高到低
delay();
SDA = 1;
delay();
SCL = 0;
_nop_();
}

/*       i2C 應(yīng)答函數(shù)                   */
void I2C_ack(bit a)
{
if(a == 0) SDA = 0;
else SDA = 1;
delay();
SCL = 1;
delay();
SCL = 0;       /*清時(shí)鐘線，鉗住I2C總線以便繼續(xù)接收*/
_nop_();
}

/*             I2C寫一字節(jié)數(shù)據(jù)                */
void I2C_writebyte(uchar datum)
{
   uchar i;
   for(i=0; i<8; i++)
   {
if(i<<datum&0x80)  SDA = 1;
else SDA = 0;
_nop_();
SCL = 1;    /*置時(shí)鐘線為高，通知被控器開始接收數(shù)據(jù)位*/
delay();
SCL = 0;
   }      //一幀的數(shù)據(jù)傳輸完畢，開始應(yīng)答
SDA = 1;       /*8位發(fā)送完后釋放數(shù)據(jù)線，準(zhǔn)備接收應(yīng)答位*/
delay();
SCL = 1;
delay();
if(SDA ==1) ack = 0;    //fei應(yīng)答
else ack = 1;
SCL = 0;
delay();
}

/*             I2C讀一字節(jié)數(shù)據(jù)                */
uchar I2C_readbyte()
{
   uchar datum, i;
   datum = 0;
   SDA = 1;                      /*置數(shù)據(jù)線為輸入方式*/
   for(i=0; i<8; i++)
   {
     SCL = 0;                         /*置時(shí)鐘線為低，準(zhǔn)備接收數(shù)據(jù)位*/
delay();
SCL = 1; /*置時(shí)鐘線為高使數(shù)據(jù)線上數(shù)據(jù)有效*/
delay();
datum <<= 1;
if(SDA == 1)
datum |= 0x01;
_nop_();
_nop_();
   }
SCL = 0;
delay();

return datum;
}

/* I2C寫入多個(gè)字節(jié)的數(shù)據(jù) */
bit I2Cwritenbyte(uchar SLA, uchar SUBA, uchar *datum, uchar n)
{
uchar i;
I2C_Start();
I2C_writebyte(SLA);
if(ack == 0) return 0;

I2C_writebyte(SUBA);
if(ack == 0) return 0;

for(i=0; i<n; i++)
{
I2C_writebyte(*datum);
if(ack == 0) return 0;    //程序員自己設(shè)定是否繼續(xù)
datum++;
}
I2C_Stop();

return 1;
}

/* I2C讀入多個(gè)字節(jié)的數(shù)據(jù) */
bit I2Creadnbyte(uchar SLA, uchar SUBA, uchar *datum, uchar n)
{
uchar i;

I2C_Start();
I2C_writebyte(SLA);       /*發(fā)送器件地址*/
if(ack == 0) return 0;

I2C_writebyte(SUBA);    /*發(fā)送器件子地址*/
if(ack == 0) return 0;

I2C_Start();    /*重新啟動(dòng)總線*/
I2C_writebyte(SLA+1);    //發(fā)送器件寫地址
if(ack == 0) return 0;

for(i=0; i<n-1; i++)
{
*datum = I2C_readbyte();
I2C_ack(0);
datum++;
}
*datum = I2C_readbyte();
I2C_ack(1);                /*發(fā)送非應(yīng)位*/
I2C_Stop();                /*結(jié)束總線*/

return(1);
}

void system_init()
{
TMOD|= 0x11;
TH1 = 0xfe; //11.0592
TL1 = 0x33;
TR1  = 1;
IE =0x8A;

}

void Delay(unsigned int i)
{
char j;
for(i; i > 0; i--)
      for(j = 200; j > 0; j--);
}

void display(uchar count)
{
uchar LedNumVal,i;
   /********以下將2402中保存的數(shù)據(jù)送到LED數(shù)碼管顯示*************/
   LedNumVal=count;
   LedOut[0]=Disp_Tab[LedNumVal%10000/1000];
   LedOut[1]=Disp_Tab[LedNumVal%1000/100];
   LedOut[2]=Disp_Tab[LedNumVal%100/10]|0x80;
   LedOut[3]=Disp_Tab[LedNumVal%10];

   for(i=0; i<4; i++)
   {

      P0 =  LedOut[i];

switch(i)
      {
case 0:LS138A=0; LS138B=0; LS138C=0; break;
         case 1:LS138A=1; LS138B=0; LS138C=0; break;
         case 2:LS138A=0; LS138B=1; LS138C=0; break;
         case 3:LS138A=1; LS138B=1; LS138C=0; break;
case 4:LS138A=0; LS138B=0; LS138C=1; break;
      }
Delay(100);
   }
}
void main()
{
unsigned char i;
unsigned char pDat[8];

system_init();

while(1)
{
   //========================IIC 讀取
if(K2 == 0)    //第二個(gè)按鈕讀取數(shù)據(jù)
{
   I2Creadnbyte(AT24C02, 0 , &pDat[0], 8);
   for (i=0; i<4; i++)
   {
D[14+i]=pDat[i*2+0]+pDat[i*2+1]*0x100;
Count1 = D[14];
   }
   }

   //========================IIC 保存
   if(K1 == 0) //第一個(gè)按鈕保存數(shù)據(jù)
   {
      D[14]= Count1;
   for (i=0; i<4; i++)
      {
   pDat[i*2+0]=D[14+i];    //D[14]是長(zhǎng)字節(jié)的無符號(hào)型的數(shù)據(jù)
   pDat[i*2+1]=D[14+i]>>8;    //pDat[]是8位的數(shù)據(jù)，所以要進(jìn)行轉(zhuǎn)換防止數(shù)據(jù)丟失
   }
      I2Cwritenbyte(AT24C02, 0 , &pDat[0], 8);
   D[14] = 0;
   }
   display(Count1);
}
}

void T1zd(void) interrupt 3 //3 為定時(shí)器1的中斷號(hào)  1 定時(shí)器0的中斷號(hào) 0 外部中斷1 2 外部中斷2  4 串口中斷
{
   TH1 = 0xfe; //12M
   TL1 = 0x33;

if(USEC++==200)
{ USEC=0;

if (!K3) Count1++;    //改變數(shù)據(jù)
if (!K4&Count1!=0) Count1--;
}
}

作者: kpdz009 時(shí)間: 2014-8-10 09:07
沒看懂

作者: lzzgg834483370 時(shí)間: 2014-9-18 11:20
額地址你搞錯(cuò)了寫是0xa0，讀是0xa1。 R/W位有區(qū)別的親~~~~~~

作者: lzzgg834483370 時(shí)間: 2014-9-18 11:41
對(duì)于I2C的EEPROM器件，D7-D4是1010 后面D3-D1是地址最后一位是R/W

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