单片机lcd显示不明白怎么写程序

ID:1096616 · 发表于 2023-12-4 12:09

要求通过矩阵键盘显示6位学号，但目前只可以单位显示，没法显示6位，希望大佬给一个思路

/**************************************************/
#include <reg52.h>    //包含52头文件
#define uint unsigned int //宏定义uint代替unsigned int
#define uchar unsigned char //宏定义uchar代替unsigned char
#define out P0
sbit lcdrs=P2^4;
sbit lcdrw=P2^5;
sbit lcden=P2^6;
void check_busy(void);
void write_cmd(char cmd);
void write_data(uchar dat);
void write_str(uchar *str);
void lcd_init();
void keyscan();
uchar key,num=100,flag;
uint cnt=0;
uchar dat[]="0123456789ABCDEF";
void delay (uint xms)    //毫秒函数定义
{
uint i,j;
for(i=0;i<xms;i++)
   for(j=0;j<120;j++);
}

void  main()                         //主函数
{       lcd_init();
      write_cmd(0x80+0x40);
while(1)
{
      keyscan();

         if(num<16)
         {
         write_data(dat[key]);

      }

}
}

/**********************检查忙标志函数************************/
void check_busy(void)
{
uchar dt;
      out=0xff;
      do
      {
         lcden=0;
         lcdrs=0;
         lcdrw=1;
         lcden=1;
         dt=out;
      }while(dt&0x80);
      lcden=0;
}
/**************************1602显示****************************/
void write_cmd(char cmd)  //写指令函数
{
      check_busy();
      lcden=0;//再把EN拉低
      lcdrs=0;
      lcdrw=0;//先将RW拉低
      out=cmd;
      lcden=1;
      lcden=0;
}
void write_data(uchar dat) //写数据函数
{
      check_busy();
      lcden=0;//再把EN拉低
      lcdrs=1;
      lcdrw=0;//先将RW拉低
      out=dat;
      lcden=1;
      lcden=0;
}
void write_str(uchar *str)//写字符串函数
{
      while(*str!='\0')
      {
            write_data(*str++);
            delay(5);
      }
}
/***************************初始化******************************/
void lcd_init()//初始化1602
{
      write_cmd(0x38);//显示模式设置
      write_cmd(0x0c);//显示开关,光标没有闪烁
      write_cmd(0x06);//显示光标移动设置
      write_cmd(0x01);//清除屏幕
      delay(1);
}
void keyscan()
{
uchar temp,num;
P1=0xff;    //先向P1写1
      P1=0xfe;    //选中按键第一行
      temp=P1;          //把P1给中间变量
      temp=temp&0xf0;//低四位清零
      while(temp!=0xf0)
{
      delay(5);
      temp=P1;
      temp=temp&0xf0;
      while(temp!=0xf0)
      {
         temp=P1;
         switch(temp)
            {
                        case 0xee:key=0; break;
                        case 0xde:key=1; break;
                        case 0xbe:key=2; break;
                        case 0x7e:key=3; break;
                     }
                     while(temp!=0xf0)
                  {
                     temp=P1;
                     temp=temp&0xf0;
                  }
         }
}

      P1=0xfd;//选中按键第二行
      temp=P1;       //把P1给中间变量
      temp=temp&0xf0;//低四位清零
      while(temp!=0xf0)
{
      delay(5);
      temp=P1;
      temp=temp&0xf0;
      while(temp!=0xf0)
      {
         temp=P1;
         switch(temp)
         {
                        case 0xed:key=4; break;
                        case 0xdd:key=5; break;
                        case 0xbd:key=6; break;
                        case 0x7d:key=7; break;
                     }
                     while(temp!=0xf0)
                  {
                     temp=P1;
                     temp=temp&0xf0;
                  }
         }
      }

      P1=0xfb;//选中按键第三行
      temp=P1;       //把P1给中间变量
      temp=temp&0xf0;//低四位清零
      while(temp!=0xf0)
{
      delay(5);
      temp=P1;
      temp=temp&0xf0;
      while(temp!=0xf0)
      {
         temp=P1;
         switch(temp)
         {
                        case 0xeb:key=8; break;
                        case 0xdb:key=9; break;
                        case 0xbb:key=10; break;
                        case 0x7b:key=11; break;
                  }
                     while(temp!=0xf0)
                     {
                        temp=P1;
                        temp=temp&0xf0;
                     }
               }
   }

      P1=0xf7;//选中按键第四行
      temp=P1;       //把P1给中间变量
      temp=temp&0xf0;//低四位清零
      while(temp!=0xf0)
{
      delay(5);
      temp=P1;
      temp=temp&0xf0;
      while(temp!=0xf0)
      {
         temp=P1;
         switch(temp)
         {
                        case 0xe7:key=12; break;
                        case 0xd7:key=13; break;
                        case 0xb7:key=14; break;
                        case 0x77:key=15; break;
                     }
                     while(temp!=0xf0)
                  {
                     temp=P1;
                     temp=temp&0xf0;
                  }
         }
}
while((num<50)&&(temp!=0xf0))
{delay(10);
   num++;
}
num=0;
}