51单片机 1602液晶显示操控代码2

1 /*--2 称号：LCD16023 论坛：www.doflye.net4 编写：shifang5 内容：经过矩阵键盘输入，顺次显现0-F16中字符6 引脚界说如下：1-VSS 2-VDD 3-V0 4-RS 5-R/W 6-E 7-14 DB0-DB7 15-BLA 16-BLK7 */8 #include //包括头文件，一般状况不需要改动，头文件包括特别功用寄存器的界说9 #include10 11 sbit RS = P2^4;   //界说端口 12 sbit RW = P2^5;13 sbit EN = P2^6;14 15 #define RS_CLR RS=0 16 #define RS_SET RS=117 18 #define RW_CLR RW=0 19 #define RW_SET RW=1 20 21 #define EN_CLR EN=022 #define EN_SET EN=123 24 #define DataPort P025 #define KeyPort P126 27 unsigned char code dofly_code[]={0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F};//转换成液晶显现的字符28 /*29 uS延时函数，含有输入参数 unsigned char t，无回来值30 unsigned char 是界说无符号字符变量，其值的规模是31 0~255 这儿运用晶振12M，准确延时请运用汇编,大致延时32 长度如下 T=tx2+5 uS 33 */34 void DelayUs2x(unsigned char t)35 {   36     while(--t);37 }38 /*39 mS延时函数，含有输入参数 unsigned char t，无回来值40 unsigned char 是界说无符号字符变量，其值的规模是41 0~255 这儿运用晶振12M，准确延时请运用汇编42 */43 void DelayMs(unsigned char t)44 {45     46     while(t--)47     {48         //大致延时1mS49         DelayUs2x(245);50         DelayUs2x(245);51     }52 }53 /*54 判忙函数55 */56 bit LCD_Check_Busy(void) 57 { 58     DataPort= 0xFF; 59     RS_CLR; 60     RW_SET; 61     EN_CLR; 62     _nop_(); 63     EN_SET;64     return (bit)(DataPort & 0x80);65 }66 /*67 写入指令函数68 */69 void LCD_Write_Com(unsigned char com) 70 {  71     // while(LCD_Check_Busy()); //忙则等候72     DelayMs(5);73     RS_CLR; 74     RW_CLR; 75     EN_SET; 76     DataPort= com; 77     _nop_(); 78     EN_CLR;79 }80 /*81 写入数据函数82 */83 void LCD_Write_Data(unsigned char Data) 84 { 85     //while(LCD_Check_Busy()); //忙则等候86     DelayMs(5);87     RS_SET; 88     RW_CLR; 89     EN_SET; 90     DataPort= Data; 91     _nop_();92     EN_CLR;93 }94 /*95 清屏函数96 */97 void LCD_Clear(void) 98 { 99     LCD_Write_Com(0x01); 100     DelayMs(5);101 }102 /*103 写入字符串函数104 */105 void LCD_Write_String(unsigned char x,unsigned char y,unsigned char *s) 106 {     107     if (y == 0) 108     {     109         LCD_Write_Com(0x80 + x);     110     }else 112     {     113         LCD_Write_Com(0xC0 + x);     114     }        115     while (*s) 116     {     117         LCD_Write_Data( *s);     118         s ++;     119     }120 }121 /*122 写入字符函数123 */124 void LCD_Write_Char(unsigned char x,unsigned char y,unsigned char Data) 125 {     126     if (y == 0) 127     {     128         LCD_Write_Com(0x80 + x);     129     }    130     else 131     {     132         LCD_Write_Com(0xC0 + x);     133     }        134     LCD_Write_Data( Data);  135 }136 /*137 初始化函数138 */139 void LCD_Init(void) 140 {141     LCD_Write_Com(0x38);    /*显现形式设置*/ 142     DelayMs(5); 143     LCD_Write_Com(0x38); 144     DelayMs(5); 145     LCD_Write_Com(0x38); 146     DelayMs(5); 147     LCD_Write_Com(0x38);  148     LCD_Write_Com(0x08);    /*显现封闭*/ 149     LCD_Write_Com(0x01);    /*显现清屏*/ 150     LCD_Write_Com(0x06);    /*显现光标移动设置*/ 151     DelayMs(5); 152     LCD_Write_Com(0x0C);    /*显现开及光标设置*/153 }154 155 /*156 按键扫描函数，回来扫描键值157 */158 unsigned char KeyScan(void)  //键盘扫描函数，运用队伍回转扫描法159 {160     unsigned char cord_h,cord_l;//队伍值中心变量161     KeyPort=0x0f;            //行线输出全为0162     cord_h=KeyPort&0x0f;     //读入列线值163     if(cord_h!=0x0f)    //先检测有无按键按下164     {                                                                                                              165         DelayMs(10);        //去抖166         if((KeyPort&0x0f)!=0x0f)167         {168             cord_h=KeyPort&0x0f;  //读入列线值169             KeyPort=cord_h0xf0;  //输出当前列线值170             cord_l=KeyPort&0xf0;  //读入行线值171             172             while((KeyPort&0xf0)!=0xf0);//等候松开并输出173             174             return(cord_h+cord_l);//键盘最终组合码值175         }176     }return(0xff);     //回来该值177 }178 /*179 按键值处理函数，回来扫键值180 */181 unsigned char KeyPro(void)182 {183     switch(KeyScan())184     {185     case 0x7e:return 0;break;//0 按下相应的键显现相对应的码值186     case 0x7d:return 1;break;//1187     case 0x7b:return 2;break;//2188     case 0x77:return 3;break;//3189     case 0xbe:return 4;break;//4190     case 0xbd:return 5;break;//5191     case 0xbb:return 6;break;//6192     case 0xb7:return 7;break;//7193     case 0xde:return 8;break;//8194     case 0xdd:return 9;break;//9195     case 0xdb:return 10;break;//a196     case 0xd7:return 11;break;//b197     case 0xee:return 12;break;//c198     case 0xed:return 13;break;//d199     case 0xeb:return 14;break;//e200     case 0xe7:return 15;break;//f201     default:return 0xff;break;202     }203 }204 205 /*206 主函数207 */ 208 void main(void) 209 { 210     unsigned char i,j,num; 211     212     LCD_Init(); 213     LCD_Write_Com(0x0F);//光标开，光标业绩开214     215     LCD_Write_String(0,0,"Press the key !");216     217     while (1) 218     {  219         num=KeyPro();220         if(num!=0xff)221         {if((i==0)&&(j==0))//回到榜首个字符时清屏223                 LCD_Clear();//清屏224             LCD_Write_Char(0+i,0+j,dofly_code[num]);//顺次显现输入字符225             i++;226             if(i==16)//假如榜首行显现满，转到第二行227             {228                 i=0;j++;229                 if(j==2)//假如2行都显现满，清屏后从头从榜首行显现230                 {231                     j=0;232                 }233             }234         }235     }236 }