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#include<reg52.h>
#include "intrins.h"
#define unit unsigned int
#define uchar unsigned char
#define I2CCFG (*(unsigned char volatile xdata *)0xfe80)
#define I2CMSCR (*(unsigned char volatile xdata *)0xfe81)
#define I2CMSST (*(unsigned char volatile xdata *)0xfe82)
#define I2CSLCR (*(unsigned char volatile xdata *)0xfe83)
#define I2CSLST (*(unsigned char volatile xdata *)0xfe84)
#define I2CSLADR (*(unsigned char volatile xdata *)0xfe85)
#define I2CTXD (*(unsigned char volatile xdata *)0xfe86)
#define I2CRXD (*(unsigned char volatile xdata *)0xfe87)
#define i2cl 0x44 //定義前提命令 -發送低8位IO口數據
#define i2ch 0x46 //定義前提命令 -發送高8位IO口數據
unsigned int u=0;v=0;x=0; y=0; m=0;w=0;
static unsigned char a,b,d,e,f,g,h,i,c,i2clh,i2cdata;
sfr P0M0 = 0x94;
sfr P0M1 = 0x93;
sfr P1M0 = 0x92;
sfr P1M1 = 0x91;
sfr P2M0 = 0x96;
sfr P2M1 = 0x95;
sfr P3M0 = 0xb2;
sfr P3M1 = 0xb1;
sfr P4M0 = 0xb4;
sfr P4M1 = 0xb3;
sfr P5M0 = 0xca;
sfr P5M1 = 0xc9;
sfr P6M0 = 0xcc;
sfr P6M1 = 0xcb;
sfr P7M0 = 0xe2;
sfr P7M1 = 0xe1;
sfr P4 = 0xc0;
sfr P5 = 0xc8;
sfr P6 = 0xe8;
sfr P7 = 0xf8;
sfr P_SW2 = 0xba;
sbit k1=P7^3; //高/低位數據選擇開關
sbit k2=P2^0; //點動測試開關，數據有變化I2C就發送新的數據到IO擴展IC
sbit k14=P4^2; //清零開關
bit busy; //I2C中斷標志位
void timer0Init() //中斷時間計數器函數
{
TMOD|=0x01;
TH0=0xFF;
TL0=0xA3;
ET0=1;
EA=1;
TR0=1;
}
void Timer0() interrupt 1 //程序運行依賴-中斷函數
{
TH0=0xFF;
TL0=0xA3;
y++;
u++;
v++;
ys++;
if(k2==0||k14==0)
{x++; }
}
void I2C_Isr() interrupt 24 //I2C中斷函數-清零
{
char store;
store = P_SW2;
P_SW2 |= 0x80;
if (I2CMSST & 0x40)
{
I2CMSST &= ~0x40; //清中斷標志
busy = 0;
}
P_SW2 = store;
}
//_______________________________ I2C各命令子函數
void Start()
{
busy = 1;
I2CMSCR = 0x81; //發送START命令
while (busy);
}
void SendData(char dat)
{
I2CTXD = dat; //寫數據到數據緩沖區
busy = 1;
I2CMSCR = 0x82; //發送SEND命令
while (busy);
}
void RecvACK()
{
busy = 1;
I2CMSCR = 0x83; //發送讀ACK命令
while (busy);
}
void Stop()
{
busy = 1;
I2CMSCR = 0x86; //發送STOP命令
while (busy);
}
//_________________________
void i2c(char aa,char bb) //數據發送完整流程函數
{
Start(); //啟動
SendData(aa); //發數據1 --設置命令
RecvACK(); //應答1
SendData(bb); //發數據2 --驅動數據
RecvACK(); //應答2
Stop(); //停止
}
void cx1()
{
e=c;f=d;
if(k1==0) //高8位數據+1
{if(k2==0&&x>50){while(!k2);c++;x=0;}} //x>50-為開關消抖
if(k1==1) //低8位數據+1
{if(k2==0&&x>50){while(!k2);d++;x=0;}}
if(k14==0&&x>50) //按鍵清零
{while(!k14);c=d=e=f=x=0;}
if(e!=c){i2c(i2cl,c);} //高8位數據有變化就發送到IO擴展芯片
if(f!=d){i2c(i2ch,d);} //低8位數據有變化就發送到IO擴展芯片
if(c>8){c=e=0;} //超過8位，清零
if(d>8){d=f=0;} //超過8位，清零
}
main()
{
timer0Init();
P_SW2 = 0x90; //使能I2C主機模式-并配置I2C腳位
I2CCFG = 0xe0; //使能I2C主機模式
I2CMSST = 0x00;
i2c(0x48,0x10); //IO擴展芯片配置清零
P0=P1=P6=0x00; P2=P7=0x0F; P3=0xE2; P4=0x06;P5=0x03;
P0M0 = 0x00; //設置P0.0~P0.7為準雙向口模式
P0M1 = 0x00;
P1M0 = 0x00; //設置P1.0~P1.7為準雙向口模式
P1M1 = 0x00;
P2M0 = 0x00; //設置P2.0~P2.7為準雙向口模式
P2M1 = 0x00;
P3M0 = 0x00; //設置P3.0~P3.7為準雙向口模式
P3M1 = 0x00;
P4M0 = 0x00; //設置P4.0~P4.7為準雙向口模式
P4M1 = 0x00;
P5M0 = 0x00; //設置P5.0~P5.7為準雙向口模式
P5M1 = 0x00;
P6M0 = 0x00; //設置P6.0~P6.7為準雙向口模式
P6M1 = 0x00;
P7M0 = 0x00; //設置P7.0~P7.7為準雙向口模式
P7M1 = 0x00;
a=0;
b=0;
c=0;
i=0;
while(1)
{
cx1();
}
}

復制代碼

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