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准备用C51做个学生管理系统（2）

2024-07-15 23:20:25   211人阅读

能够控制矩阵键盘以后，我就直接改代码控制8X8的键盘，用P1和P3口

  1 void keyscan()  2 {  3     uchar tmp;  4     P1 = 0xff;  5     P3 = 0x00;  6     delay(5);  7     tmp = P1^0xff;  8   9     //blink(); 10     //delay(500); 11  12     switch(tmp){ 13         case 1: 14             now_num = 0; 15             break; 16         case 2: 17             now_num = 1; 18             break; 19         case 4: 20             now_num = 2; 21             break; 22         case 8: 23             now_num = 3; 24             break; 25         case 16: 26             now_num = 4; 27             break; 28         case 32: 29             now_num = 5; 30             break; 31         case 64: 32             now_num = 6; 33             break; 34         case 128: 35             now_num = 7; 36             break; 37         default: 38             now_num = 44; 39     } 40  41     P1 = 0x00; 42     P3 = 0xff; 43     delay(5); 44     tmp = P3^0xff; 45     switch(tmp){ 46         case 1: 47             now_num += 56; 48             break; 49         case 2: 50             now_num += 48; 51             break; 52         case 4: 53             now_num += 40; 54             break; 55         case 8: 56             now_num += 32; 57             break; 58         case 16: 59             now_num += 24; 60             break; 61         case 32: 62             now_num += 16; 63             break; 64         case 64: 65             now_num += 8; 66             break; 67         case 128: 68             now_num += 0; 69             break; 70     } 71 } 72  73 void show() 74 { 75     if(pre_num != now_num)     76     { 77         display_seg(now_num); 78         pre_num = now_num; 79     } 80     display_seg(now_num); 81     //delay(100); 82 } 83  84 //主函数 85 void main() 86 { 87     int i = 0; 88     int j = 0; 89  90     P0 = 0xff; 91     P2 = 0; 92     init(); 93     TR1 = 1; 94  95     cnt = 00; 96     while(1) 97     { 98         P1 = 0x00; 99         P3 = 0xff;100 101         if(P3 != 0xff)keyscan();102         show();103     }    104 }

 

差不多就开始做LCD1062显示字符串的功能了。首先画protues电路图

 

然后在工程里面添加一个LCD1062.c的文件，代码如下：

 1 /***************   LCD1062.c   ******************/ 2 #include "common.h" 3  4 sbit RS = P2^0; 5 sbit RW = P2^1; 6 sbit EN = P2^2; 7  8 void Delayms(uint ms) 9 {10      uchar i;11     while(ms--)12     {13          for(i=0;i<120;i++);14     }15 }16 17 uchar Busy_Check()18 {19      uchar LCD_Status;20     RS = 0;21     RW = 1;22     EN = 1;23     Delayms(1);24        LCD_Status = P0;25     EN = 0;26     return LCD_Status;27 }28 29 void Write_LCD_Command(uchar cmd)30 {31      while((Busy_Check()&0x80)==0x80);32     RS = 0;33     RW = 0;34     EN = 0;35     P0 = cmd;36     EN = 1;37     Delayms(1);38     EN = 0;39 }40 41 void Write_LCD_Data(uchar dat)42 {43      while((Busy_Check()&0x80)==0x80);44     RS = 1;45     RW = 0;46     EN = 0;47     P0 = dat;48     EN = 1;49     Delayms(1);50     EN = 0;51 }52 53 void Initialize_LCD()54 {55      Write_LCD_Command(0x38);56     Delayms(1);    57     Write_LCD_Command(0x01);58     Delayms(1);    59     Write_LCD_Command(0x06);60     Delayms(1);    61     Write_LCD_Command(0x0c);62     Delayms(1);    63 }64 65 void ShowString(uchar x,uchar y,uchar *str)66 {67      uchar i = 0;68     if(y == 0)69         Write_LCD_Command(0x80 | x);70     if(y == 1)71         Write_LCD_Command(0xc0 | x);72     for(i=0;i<16;i++)73     {74          Write_LCD_Data(str[i]);    75     }76 }

 

代码的意思我也没细看，是直接从单片机100个例子里面摘抄的，要看明白可能还得了解LCD1062的一些指令，总之调用函数

ShowString(uchar x,uchar y,uchar *str) 
大概的意思：第一个参数是***（过些日子再看看）第二个参数是行号，第三个参数是显示的字符串，基本上就能够调用函数让LCD屏显示数据了。


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