[51单片机] 1602液晶显示控制代码2

news/2023/12/4 20:35:48

这是4X4按键映射为0-F的16个字符输入并显示在屏上的程序：

[这里要额外的把单片机p1的8个脚和矩阵键盘的8个脚相连]

/*-----------------------------------------------
名称：LCD1602
论坛：www.doflye.net
编写：shifang
内容：通过矩阵键盘输入，依次显示0-F16中字符
引脚定义如下：1-VSS 2-VDD 3-V0 4-RS 5-R/W 6-E 7-14 DB0-DB7 15-BLA 16-BLK
------------------------------------------------*/
#include<reg52.h> //包含头文件，一般情况不需要改动，头文件包含特殊功能寄存器的定义
#include<intrins.h>sbit RS = P2^4;   //定义端口
sbit RW = P2^5;
sbit EN = P2^6;#define RS_CLR RS=0
#define RS_SET RS=1#define RW_CLR RW=0
#define RW_SET RW=1#define EN_CLR EN=0
#define EN_SET EN=1#define DataPort P0
#define KeyPort P1unsigned char code dofly_code[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};//转换成液晶显示的字符
/*------------------------------------------------
uS延时函数，含有输入参数 unsigned char t，无返回值
unsigned char 是定义无符号字符变量，其值的范围是
0~255 这里使用晶振12M，精确延时请使用汇编,大致延时
长度如下 T=tx2+5 uS
------------------------------------------------*/
void DelayUs2x(unsigned char t)
{while(--t);
}
/*------------------------------------------------
mS延时函数，含有输入参数 unsigned char t，无返回值
unsigned char 是定义无符号字符变量，其值的范围是
0~255 这里使用晶振12M，精确延时请使用汇编
------------------------------------------------*/
void DelayMs(unsigned char t)
{while(t--){//大致延时1mSDelayUs2x(245);DelayUs2x(245);}
}
/*------------------------------------------------
判忙函数
------------------------------------------------*/
bit LCD_Check_Busy(void)
{DataPort= 0xFF;RS_CLR;RW_SET;EN_CLR;_nop_();EN_SET;return (bit)(DataPort & 0x80);
}
/*------------------------------------------------
写入命令函数
------------------------------------------------*/
void LCD_Write_Com(unsigned char com)
{// while(LCD_Check_Busy()); //忙则等待DelayMs(5);RS_CLR;RW_CLR;EN_SET;DataPort= com;_nop_();EN_CLR;
}
/*------------------------------------------------
写入数据函数
------------------------------------------------*/
void LCD_Write_Data(unsigned char Data)
{//while(LCD_Check_Busy()); //忙则等待DelayMs(5);RS_SET;RW_CLR;EN_SET;DataPort= Data;_nop_();EN_CLR;
}
/*------------------------------------------------
清屏函数
------------------------------------------------*/
void LCD_Clear(void)
{LCD_Write_Com(0x01);DelayMs(5);
}
/*------------------------------------------------
写入字符串函数
------------------------------------------------*/
void LCD_Write_String(unsigned char x,unsigned char y,unsigned char *s)
{if (y == 0){LCD_Write_Com(0x80 + x);}else{LCD_Write_Com(0xC0 + x);}while (*s){LCD_Write_Data( *s);s ++;}
}
/*------------------------------------------------
写入字符函数
------------------------------------------------*/
void LCD_Write_Char(unsigned char x,unsigned char y,unsigned char Data)
{if (y == 0){LCD_Write_Com(0x80 + x);}else{LCD_Write_Com(0xC0 + x);}LCD_Write_Data( Data);
}
/*------------------------------------------------
初始化函数
------------------------------------------------*/
void LCD_Init(void)
{LCD_Write_Com(0x38);    /*显示模式设置*/DelayMs(5);LCD_Write_Com(0x38);DelayMs(5);LCD_Write_Com(0x38);DelayMs(5);LCD_Write_Com(0x38);LCD_Write_Com(0x08);    /*显示关闭*/LCD_Write_Com(0x01);    /*显示清屏*/LCD_Write_Com(0x06);    /*显示光标移动设置*/DelayMs(5);LCD_Write_Com(0x0C);    /*显示开及光标设置*/
}/*------------------------------------------------
按键扫描函数，返回扫描键值
------------------------------------------------*/
unsigned char KeyScan(void)  //键盘扫描函数，使用行列反转扫描法
{unsigned char cord_h,cord_l;//行列值中间变量KeyPort=0x0f;            //行线输出全为0cord_h=KeyPort&0x0f;     //读入列线值if(cord_h!=0x0f)    //先检测有无按键按下{DelayMs(10);        //去抖if((KeyPort&0x0f)!=0x0f){cord_h=KeyPort&0x0f;  //读入列线值KeyPort=cord_h|0xf0;  //输出当前列线值cord_l=KeyPort&0xf0;  //读入行线值while((KeyPort&0xf0)!=0xf0);//等待松开并输出return(cord_h+cord_l);//键盘最后组合码值}}return(0xff);     //返回该值
}
/*------------------------------------------------
按键值处理函数，返回扫键值
------------------------------------------------*/
unsigned char KeyPro(void)
{switch(KeyScan()){case 0x7e:return 0;break;//0 按下相应的键显示相对应的码值case 0x7d:return 1;break;//1case 0x7b:return 2;break;//2case 0x77:return 3;break;//3case 0xbe:return 4;break;//4case 0xbd:return 5;break;//5case 0xbb:return 6;break;//6case 0xb7:return 7;break;//7case 0xde:return 8;break;//8case 0xdd:return 9;break;//9case 0xdb:return 10;break;//acase 0xd7:return 11;break;//bcase 0xee:return 12;break;//ccase 0xed:return 13;break;//dcase 0xeb:return 14;break;//ecase 0xe7:return 15;break;//fdefault:return 0xff;break;}
}/*------------------------------------------------
主函数
------------------------------------------------*/
void main(void)
{unsigned char i,j,num;LCD_Init();LCD_Write_Com(0x0F);//光标开，光标闪烁开LCD_Write_String(0,0,"Press the key !");while (1){num=KeyPro();if(num!=0xff){if((i==0)&&(j==0))//回到第一个字符时清屏LCD_Clear();//清屏LCD_Write_Char(0+i,0+j,dofly_code[num]);//依次显示输入字符i++;if(i==16)//如果第一行显示满，转到第二行{i=0;j++;if(j==2)//如果2行都显示满，清屏后重新从第一行显示{j=0;}}}}
}