按键显示程序.docx

/*1602LCD演示程序*/*目标器件：STC89C52*/*晶振：12MHz*/*编译环境：Keil 7.50A*/*/*包含头文件*/#include #include /*端口定义*/#define d_keyPort P3#define uchar unsigned charuchar ps=1,2,3,4,5;sbit rs= P20;sbit rw = P21;sbit ep = P22;sbit keyP30 = P30;sbit keyP31 = P31;sbit keyP32 = P32;sbit keyP33 = P33;sbit P10=P10;/*显示数据表*/unsigned char code dis1 = input:;unsigned char dis216 = D=;unsigned char code dis3 = error;unsigned char code dis4 = nihao;uchar key; uchar keycount;/*函数功能:LCD延时子程序入口参数:ms出口参数:*/void delaylcd(unsigned char ms)unsigned char i;while(ms-)for(i = 0; i 250; i+)_nop_();_nop_();_nop_();_nop_(); /*函数功能:键盘扫描入口参数:ms出口参数:*/unsigned char GetKey(void)/扫描键盘，取按键码 d_keyPort = 0x0f;if(d_keyPort != 0x0f)/下键按下吗？delaylcd(100); if(d_keyPort!=0x0f)/确认有键按下d_keyPort = 0x10;if(!keyP30)return 7;if(!keyP31)return 8;if(!keyP32)return 9;if(!keyP33)return 10;d_keyPort = 0x20;if(!keyP30)return 4;if(!keyP31)return 5;if(!keyP32)return 6;if(!keyP33)return 11;d_keyPort = 0x40;if(!keyP30)return 1;if(!keyP31)return 2;if(!keyP32)return 3;if(!keyP33)return 12;d_keyPort = 0x80;if(!keyP30)return 0;if(!keyP31)return 13;if(!keyP32) return 14;if(!keyP33)return 15;return 0;/* unsigned char ST(void) /键盘输入开启位 delaylcd(100); key = GetKey(); dis2j+3 = key/10+0; dis2j+4 = key%10+0; */*函数功能:测试LCD忙碌状态入口参数:出口参数:result*/bit lcd_bz()bit result;rs = 0;rw = 1;ep = 1;_nop_();_nop_();_nop_();_nop_();result = (bit)(P0 & 0x80);ep = 0;return result;/*函数功能:写指令数据到LCD子程序入口参数:cmd出口参数:*/void lcd_wcmd(unsigned char cmd)while(lcd_bz();/判断LCD是否忙碌rs = 0;rw = 0;ep = 0;_nop_();_nop_();P0 = cmd;_nop_();_nop_();_nop_();_nop_();ep = 1;_nop_();_nop_();_nop_();_nop_();ep = 0;/*函数功能:设定显示位置子程序入口参数:pos出口参数:*/void lcd_pos(unsigned char pos)lcd_wcmd(pos | 0x80);/*函数功能:写入显示数据到LCD子程序入口参数:dat出口参数:*/void lcd_wdat(unsigned char dat)while(lcd_bz();/判断LCD是否忙碌rs = 1;rw = 0;ep = 0;P0 = dat;_nop_();_nop_();_nop_();_nop_();ep = 1;_nop_();_nop_();_nop_();_nop_();ep = 0;/*函数功能:LCD初始化子程序入口参数:出口参数:*/void lcd_init()lcd_wcmd(0x38);delaylcd(1);lcd_wcmd(0x0c);delaylcd(1);lcd_wcmd(0x06);delaylcd(1);lcd_wcmd(0x01);delaylcd(1);/*函数功能:主程序入口参数:出口参数:*/void main(void)unsigned char i;unsigned char j;lcd_init();/ 初始化LCDdelaylcd(10);lcd_pos(0x01);/设置显示位置 P10=0;i = 0;while(dis1i!= 0)lcd_wdat(dis1i);/显示字符i+;lcd_pos(0x42);/ 设置显示位置i=0; while(dis4i!= 0) lcd_wdat(dis4i);/显示字符 i+; while(1) if(d_keyPort!=0x0f) delaylcd(100); key = GetKey();/扫描键盘 if(key=14)for(j=0;j6;j+) if(d_keyPort!=0x0f) delaylcd(100); key = GetKey(); dis2j+3 = key/10+0; dis2j+4 = key%10+0; lcd_pos(0x4