I2C通信ID自動查找，讀寫器制作附單片機程序+仿真電路圖

ID:282074 · 發表于 2020-2-23 20:43

本帖最后由 ksljxxq 于 2020-2-24 14:13 編輯

I2C通信ID自動查找,在維修時碰到I2C通信要找ID地址也很麻煩，我們常用的比如24Cxx系列，顯示屏通信，一般都是信號SDA與SCL，本主板用的主控芯片是stc15f2k60s2，編碼開關，1602顯示屏，二個按鈕，編碼開關按鈕是移動光標，見下圖24C測試ID 0XA0，TW8816測試ID 0X8A讀寫都正常，在i2c壓縮包是程序和仿真

制作出來的實物圖如下：

仿真原理圖如下（proteus仿真工程文件可到本帖附件中下載）

單片機源程序如下:

#include<reg51.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int //函數聲明
#define yh 0x80 //第1行+3位數顯示
uint yi,ra,si,ra1,si1;
void Init_Timer0(void);
sbit rs=P1^0;
sbit rw=P1^1;
sbit en=P1^2;
sbit k3=P3^4; //光標
sbit k1=P3^2; //讀開關
sbit k2=P3^3; //檢測地址
sbit CodingsWitch_B=P3^5; //A腳定義（即1腳）這兩腳必須接10K上拉電阻
sbit CodingsWitch_A=P3^6; //B腳定義（即3腳?
sbit SCL=P2^7; //24c02 6
sbit SDA=P2^6; // 5
void delay()
{;;}
void delay1(uint z)//延時為 1ms
{
uchar x,x1;
for(;z>0;z--)
{
for(x=0;x<114;x++)
{
for(x1=0;x1<1;x1++);
}
}
}
write_1602com(uchar com)//****液晶寫入指令函數****
{
rs=0;//數據/指令選擇置為指令
rw=0;
P0=com;//送入數據
delay1(1);
en=1;//拉高使能端，為制造有效的下降沿做準備
delay1(1);
en=0;//en由高變低，產生下降沿，液晶執行命令
}
write_1602dat(uchar dat)//***液晶寫入數據函數****
{
rs=1;//數據/指令選擇置為數據
rw=0;
P0=dat;//送入數據
delay1(1);
en=1; //en置高電平，為制造下降沿做準備
delay1(1);
en=0; //en由高變低，產生下降沿，液晶執行命令
}
lcd_init()//***液晶初始化函數****
{
write_1602com(0x38);//設置液晶工作模式，意思：16*2行顯示，5*7點陣，8位數據
write_1602com(0x0c);//開顯示不顯示光標
write_1602com(0x06);//整屏不移動，光標自動右移
write_1602com(0x01);//清顯示
}
void dsplay()
{
if(xianshi==0)
{
unsigned int c, d;
// a = (WriteDeviceAddress/256)/16; // 16進制千位
// b = (WriteDeviceAddress/256)%16; // 百位
c = (WriteDeviceAddress%256)/16; // 十位
d = (WriteDeviceAddress%256)%16; // 個位
write_1602com(yh);//指定顯示
write_1602dat('I'); //
write_1602dat('D'); //
write_1602dat(':'); //
write_1602dat('0'); //
write_1602dat('x'); //
write_1602dat(hex_table[c]); //
write_1602dat(hex_table[d]); //
}
if(xianshi==1)
{
uchar a,b,c,d,e,f,g,h,a1,b1,c1,d1,e1,f1,g1,h1;
a = (yi%256)/16; // 十位
b = (yi%256)%16; // 個位
c = (ra%256)/16; // 十位
d = (ra%256)%16; // 個位
e = (yi+1%256)/16; // 十位
f = (yi+1%256)%16; // 個位
g = (si%256)/16; // 十位
h = (si%256)%16; // 個位
a1 = (yi+2%256)/16; // 十位
b1 = (yi+2%256)%16; // 個位
c1 = (ra1%256)/16; // 十位
d1 = (ra1%256)%16; // 個位
e1 = (yi+3%256)/16; // 十位
f1 = (yi+3%256)%16; // 個位
g1 = (si1%256)/16; // 十位
h1 = (si1%256)%16; // 個位
write_1602com(yh);//指定顯示
write_1602dat('0');
write_1602dat('x');
write_1602dat(hex_table[a]); //
write_1602dat(hex_table[b]); //
write_1602dat(',');
write_1602dat(hex_table[c]); //
write_1602dat(hex_table[d]); //
write_1602dat(' ');
write_1602dat('0');
write_1602dat('x');
write_1602dat(hex_table[e]); //
write_1602dat(hex_table[f]); //
write_1602dat(',');
write_1602dat(hex_table[g]); //
write_1602dat(hex_table[h]); //
write_1602com(er);//指定顯
write_1602dat('0');
write_1602dat('x');
write_1602dat(hex_table[a1]); //
write_1602dat(hex_table[b1]); //
write_1602dat(',');
write_1602dat(hex_table[c1]); //
write_1602dat(hex_table[d1]); //
write_1602dat(' ');
write_1602dat('0');
write_1602dat('x');
write_1602dat(hex_table[e1]); //
write_1602dat(hex_table[f1]); //
write_1602dat(',');
write_1602dat(hex_table[g1]); //
write_1602dat(hex_table[h1]); //
}
if(xianshi==2)
{
uchar a,b,c,d,e,f,g,h,a1,b1,c1,d1,e1,f1,g1,h1;
a = (yi%256)/16; // 十位
b = (yi%256)%16; // 個位
c = (ra%256)/16; // 十位
d = (ra%256)%16; // 個位
e = (yi+1%256)/16; // 十位
f = (yi+1%256)%16; // 個位
g = (si%256)/16; // 十位
h = (si%256)%16; // 個位
a1 = (yi+2%256)/16; // 十位
b1 = (yi+2%256)%16; // 個位
c1 = (ra1%256)/16; // 十位
d1 = (ra1%256)%16; // 個位
e1 = (yi+3%256)/16; // 十位
f1 = (yi+3%256)%16; // 個位
g1 = (si1%256)/16; // 十位
h1 = (si1%256)%16; // 個位
write_1602com(yh);//指定顯示
write_1602dat('0');
write_1602dat('x');
write_1602dat(hex_table[a]); //
write_1602dat(hex_table[b]); //
write_1602dat(',');
write_1602dat(hex_table[c]); //
write_1602dat(hex_table[d]); //
write_1602dat(' ');
write_1602dat('0');
write_1602dat('x');
write_1602dat(hex_table[e]); //
write_1602dat(hex_table[f]); //
write_1602dat(',');
write_1602dat(hex_table[g]); //
write_1602dat(hex_table[h]); //
write_1602com(er);//指定顯
write_1602dat('0');
write_1602dat('x');
write_1602dat(hex_table[a1]); //
write_1602dat(hex_table[b1]); //
write_1602dat(',');
write_1602dat(hex_table[c1]); //
write_1602dat(hex_table[d1]); //
write_1602dat(' ');
write_1602dat('0');
write_1602dat('x');
write_1602dat(hex_table[e1]); //
write_1602dat(hex_table[f1]); //
write_1602dat(',');
write_1602dat(hex_table[g1]); //
write_1602dat(hex_table[h1]); //
}
}
void Start() //開始總線
{
SDA=1;
delay();
SCL=1;
delay();
SDA=0;
delay();
SCL=0;
delay();
}
void Stop() //結束總線
{
SCL=0;
delay();
SDA=0;
delay();
SCL=1;
delay();
SDA=1;
delay();
}
void NoAck() //發 ACK0
{
SDA=1;
delay();
SCL=1;
delay();
SCL=0;
delay();
}
bit TestAck() //測試 ACK
{
bit ErrorBit;
SDA=1;
delay();
SCL=1;
delay();
ErrorBit=SDA;
delay();
SCL=0;
delay();
return(ErrorBit);
}
Write8Bit(unsigned char input)//寫入 8 個 bit 到 24c02
{
unsigned char temp;
for(temp=8;temp!=0;temp--)
{
SDA=(bit)(input&0x80);
delay();
SCL=1;
delay();
SCL=0;
delay();
input=input<<1;
}
}
void Write24c02(uchar ch,uchar address)//寫入一個字節到 24c02 中
{
Start();
Write8Bit(WriteDeviceAddress);
TestAck();
Write8Bit(address);
TestAck();
Write8Bit(ch);
TestAck();
Stop();
delay1(10);
}
//從 24c02 中讀出 8 個 bit
uchar Read8Bit()
{
unsigned char temp,rbyte=0;
for(temp=8;temp!=0;temp--)
{
SCL=1;
rbyte=rbyte<<1;
rbyte=rbyte|((unsigned char)(SDA));
SCL=0;
}
return(rbyte);
}
uchar Read24c02(uchar address) //從 24c02 中讀出 1 個字節
{
uchar ch;
Start();
Write8Bit(WriteDeviceAddress);
TestAck();
Write8Bit(address);
TestAck();
Start();
Write8Bit(ReadDviceAddress);
TestAck();
ch=Read8Bit();
NoAck();
Stop();
return(ch);
}
void xie()
{
Write24c02(ra,yi);
delay1(10);
Write24c02(si,yi+1);
delay1(10);
Write24c02(ra1,yi+2);
delay1(10);
Write24c02(si1,yi+3);
delay1(10);
Stop();
}
void du()
{
ra=Read24c02(yi);
delay1(20);
si=Read24c02(yi+1);
delay1(20);
ra1=Read24c02(yi+2);
delay1(20);
si1=Read24c02(yi+3);
delay1(20);
Stop();
}
void set()
{
Start();
Write8Bit(WriteDeviceAddress);
TestAck();
delay1(5);
Stop();
}
void keyscan()
{
if(k2==0)
{
delay1(10);
if(!k2)
{
delay1(10);
while(!k2);
key1n+=1;
if(key1n>2)
{
key1n=1;
}
switch(key1n)
{
case 1:open=1; key3n=0;dsplaysw=0; write_1602com(0x0c);ra=0;si=0;ra1=0;si1=0;//關閉光標
break;
case 2:open=0;num=0;jishu=0; dsplaysw=0;xianshi=0;lcd_init(); key2n=0; key3n=0;
break;
}
}
}
if(k1==0)
{
delay1(10);
if(!k1)
{
delay1(10);
while(!k1);
key2n+=1;
if(key2n>2)
{
key2n=1;
}
switch(key2n)
{
case 1: du();xianshi=1;key3n=0; dsplaysw=0; write_1602com(0x0c);//關閉光標
break;
case 2: dsplaysw=1;xianshi=2; write_1602com(yh+5);write_1602com(0x0f);key3n=1;
break;
}
}
}
if(key2n==2)
{
if(k3==0)
{
delay1(50);
if(!k3)
{
delay1(50);
while(!k3);
key3n+=1;
if(key3n>5)
{
key3n=1;
}
switch(key3n)
{
case 1: write_1602com(yh+5); //設置按鍵按動一次秒位置顯示光標
write_1602com(0x0f); //設置光標為閃爍
break;
case 2: write_1602com(yh+13);
write_1602com(0x0f); //設置光標為閃爍
break;
case 3: write_1602com(er+5);
write_1602com(0x0f); //設置光標為閃爍
break;
case 4: write_1602com(er+13);
write_1602com(0x0f); //設置光標為閃爍
break;
case 5: write_1602com(0x0c);//關閉光標
xie();
xianshi=1;key2n=1;key3n=0; dsplaysw=0;
break;
}
}
}
}
}
uint CodingsWitchPolling()
{
static uchar Aold,Bold; //兩個變量用來儲存上一次調用時編碼開關兩引腳的電平
static uchar st=0; //用來儲存以前是否出現了兩個引腳都為高電平的狀態
static uint tmp=0; // ***這3個均為靜態變量，以便保持上次結果***
if(CodingsWitch_A&&CodingsWitch_B)
st = 1;
if(st) //如果st為1執行下面的步驟
{
if(CodingsWitch_A==0&&CodingsWitch_B==0) //如果兩引腳都為低執行下面
{
if(Bold) //為高說明編碼開關在向加大的方向轉
{
st = 0;
if(yi==9999)yi=9999;
if(ra>255)ra=0;
if(si>255)si=0;
if(ra1>255)ra1=0;
if(si1>255)si1=0;
else
if(key2n==1){yi+=4;du();}
if(key3n==1){ra+=1;write_1602com(0x0c);dsplay();write_1602com(yh+5);write_1602com(0x0f);}
if(key3n==2){si+=1;write_1602com(0x0c);dsplay();write_1602com(yh+13);write_1602com(0x0f);}
if(key3n==3){ra1+=1;write_1602com(0x0c);dsplay();write_1602com(er+5);write_1602com(0x0f);}
if(key3n==4){si1+=1;write_1602com(0x0c);dsplay();write_1602com(er+13);write_1602com(0x0f);}
}
if(Aold) //為高說明編碼開關在向減小的方向轉
{
st = 0;
if(yi==0)yi=0;
if(ra<0)ra=0;
if(si<0)si=0;
if(ra1<0)ra1=0;
if(si1<0)si1=0;
else
if(key2n==1){yi-=4;du();} //設返回值
if(key3n==1){ra-=1;write_1602com(0x0c);dsplay();write_1602com(yh+5);write_1602com(0x0f);}
if(key3n==2){si-=1;write_1602com(0x0c);dsplay();write_1602com(yh+13);write_1602com(0x0f);}
if(key3n==3){ra1-=1;write_1602com(0x0c);dsplay();write_1602com(er+5);write_1602com(0x0f);}
if(key3n==4){si1-=1;write_1602com(0x0c);dsplay();write_1602com(er+13);write_1602com(0x0f);}
}
}
}
Aold = CodingsWitch_A; //保持這次檢測的電平，以備下次調用比較用
Bold = CodingsWitch_B; //
return tmp; //返回計數值
}
void main()
{
lcd_init();
Init_Timer0();
while(1)
{
keyscan();
if(dsplaysw==0){dsplay();}
}
}
void Init_Timer0(void)
{
TMOD=0x01;
ET0=1; //定時器中斷打開
TR0=1; //定時器開關打開
ET1=1; //定時器中斷打開
TR1=1; //定時器開關打?
EA=1; //總中斷打開
}
void Timer0_isr(void) interrupt 1
{
TH0=(65536-50000)/256; //重新賦值 2ms 62500
TL0=(65536-50000)%256;
if(open==1)
{
num++;
if(num==3)
{
num=0;
jishu++;
set();
if(jishu>255)
{
jishu=255;
}
}
}
}
void Timer1_isr(void) interrupt 3
{
TH1=0xec;
TL1=0xec;
CodingsWitchPolling(); //調用編碼開關函數
}