龟头局部潮红不痛不痒:51单片机之LCD1602液晶显示与4×4矩阵键盘
来源:百度文库 编辑:偶看新闻 时间:2024/04/25 14:18:50
一、要求:
液晶显示器第一行显示“Hello World!”;
第二行显示键值和按键次数,且按键时间大于1.5秒时,识别为2次按键。
单片机型号:STC--12C5A16AD
二、程序代码:
#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,0xEE};
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();
}
}