1602按键输入显示
单片机源程序如下:
- /*-----------------------------------------------
- 名称:LCD1602
- 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 P1
- 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1mS
- DelayUs2x(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
- 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
- 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0
- cord_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;//1
- case 0x7b:return 2;break;//2
- case 0x77:return 3;break;//3
- case 0xbe:return 4;break;//4
- case 0xbd:return 5;break;//5
- case 0xbb:return 6;break;//6
- case 0xb7:return 7;break;//7
- case 0xde:return 8;break;//8
- case 0xdd:return 9;break;//9
- case 0xdb:return 10;break;//a
- case 0xd7:return 11;break;//b
- case 0xee:return 12;break;//c
- case 0xed:return 13;break;//d
- case 0xeb:return 14;break;//e
- case 0xe7:return 15;break;//f
- default:return 0xff;break;
- }
- }
- /*------------------------------------------------
- 主函数
- ------------------------------------------------*/
- void main(void)
- {
- unsigned char i,j,num;
- ……………………
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