51单片机教程实例93-1602液晶动态显示

/*----------------------------------------------- 名称：LCD1602 论坛：www.doflye.net 编写：shifang 日期：2009.5 修改：无 内容：通过标准程序动态显示字符 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 /*------------------------------------------------ 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*/ } /*------------------------------------------------ 主函数 ------------------------------------------------*/ void main(void) { unsigned char i; unsigned char *p; LCD_Init(); while (1) { i = 1; p = "www.doflye.net"; LCD_Clear(); LCD_Write_String(2,0,"Welcome to"); DelayMs(250); while (*p) { LCD_Write_Char(i,1,*p); i ++; p ++; DelayMs(250); } DelayMs(250); } }