51按键程序

#include

#include

#define uchar unsigned char

#define uint unsigned int

unsigned char code dis[]={"Hello World!"};

unsigned char code dis1[]={"KEY:"};

unsigned char code dis2[]={"TIME:"};

uchar key_val[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G'};

uchar code

key_code[]={0x77,0x7B,0x7D,0x7E,0xB7,0xBB,0xBD,0xBE,0xD7,0xDB,0xDD,0xDE,0xE7,0xEB,0xED,0 xEE};

uchar key,x,count;

uint time=0;

sbit U3_DS=P1^5;

sbit U3_STCP=P1^4;

sbit U3_SHCP=P1^3;

sbit U4_DS=P1^2;

sbit U4_STCP=P1^1;

sbit U4_SHCP=P1^0;

void delay(unsigned int n);

//74HC595

void U3_595(unsigned char num)

{

unsigned char count1;

for (count1=0;count1<=7;count1++)

{

if ((num&0x80)==0x80)//最高位为1，则向SDATA_595发送1

{

U3_DS=1;

}

else

{

U3_DS=0;

}

U3_SHCP=0;

U3_SHCP=1;

num<<=1;//左移

}

U3_STCP=0;

U3_STCP=1;

}

void U4_595(unsigned char num)//发送指令到RS,RW,E(4,5,6位) {

unsigned char count2;

for (count2=0;count2<=7;count2++)

{

if((num&0x80)==0x80)

{

U4_DS=1;

}

else

{

U4_DS=0;

}

U4_SHCP=0;

U4_SHCP=1;

num<<=1;

}

U4_STCP=0;

U4_STCP=1;

}

//LCD延时子程序n=1时延时1ms

void delay(unsigned int n)

{

unsigned int i;

for(;n>0;n--)

for(i=0;i<255;i++)

_nop_();

}

//写指令到LCD

void wcmd(unsigned char cmd)

{

U4_595(0x00);

U3_595(cmd);

U4_595(0x40);

U4_595(0x00);

}

//写要显示的数据到LCD

void wdat(unsigned char dat)

{

U4_595(0x10);

U3_595(dat);

U4_595(0x50);

U4_595(0x10);

}

//初始化LCD

void init()

{

wcmd(0x38);//设置8位总线双行显示，5*7点阵delay(20);

wcmd(0x0C);//开显示，开光标，不闪烁

delay(20);

wcmd(0x06);//读写字符时地址加1

delay(20);

wcmd(0x01);//清屏

delay(20);

wcmd(0x80+2);

for(x=0;x<12;x++) //第一行显示hello world! wdat(dis[x]);

delay(20);

wcmd(0xC2);

for(x=0;x<4;x++)//第二行显示按键和次数

wdat(dis1[x]);

wcmd(0xC8);

for(x=0;x<5;x++)

wdat(dis2[x]);

TMOD=0x01;//中断设置

TH0=0x3C;//定时初值设置

TL0=0xB0;

EA=1;//开中断

ET0=1;//定时器0中断允许

}

//键盘扫描子程序

uchar keyscan(void)

{

unsigned char hang,lie,keycode; char i;

P0=0xf0;

hang=P0;

if((hang&0xf0)!=0xf0) //有键按下？{

delay(50); //去抖动

hang=P0;

if((hang&0xf0)!=0xf0) //有键按下{

P0=0x0f;

lie=P0;

keycode=hang|lie; //获得键码

for(i=15;i>=0;i--)

{

if(keycode==key_code[i]) //查找键码{

key=i;

return(key);

}

}

}

}

else

P0=0xff; //按键弹起则关闭定时器

TR0=0;

count=0;

return (16);

}

}

void keydown() //判断按键按下和显示程序

{

P0=0xf0;

if((P0&0xf0)!=0xf0)

{

TR0=1; //开启定时器

while(P0!=0xf0)

keyscan(); //获得键码

if(count<30)

{

time++;

count=0;

}

else //超过1.5秒计数2次

{

time+=2;

count=0;

}

wcmd(0xC6); //设置键值显示位置

wdat(key_val[16-key]);

wcmd(0xCD); //设置次数显示位置

if(time<10)

wdat(0x30+time);

if(time>9&&time<100)

{

wdat(0x30+time/10);

wdat(0x30+time%10);

if(time>99&&time<1000)

{

wdat(0x30+time/100);

wdat(0x30+time/10-(time/100)*10); wdat(0x30+time%10);

}

}

}

//中断函数

void timer() interrupt 1

{

TH0=0x3C;

TL0=0xB0;

count++;

}

void main(void)

{

init();

for(;;)

{

keydown();

}

}