#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
unsigned char tt;
unsigned char ss,sg,second;
unsigned char code p[]="0123456789";
/*------------------------------------------------
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
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)
{
tt=0;
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*/
}
void Init_Timer0(void)
{
TMOD |= 0x01; //使用模式1,16位定时器,使用"|"符号可以在使用多个定时器时不受影响
TH0=(65536-5000)/256; //给定初值,这里使用定时器最大值从0开始计数一直到65535溢出
TL0=(65536-5000)%256;
EA=1; //总中断打开
ET0=1; //定时器中断打开
TR0=1; //定时器开关打开
}
/*------------------------------------------------
主程序
------------------------------------------------*/
/*------------------------------------------------
定时器中断子程序
------------------------------------------------*/
void Timer0_isr(void) interrupt 1 using 1
{
TH0=(65536-5000)/256;
TL0=(65536-5000)%256;
tt++;
}
/*------------------------------------------------
主函数
------------------------------------------------*/
/*-----------------------------------------------*/
void main(void)
{
Init_Timer0();
LCD_Init();
while (1)
{ LCD_Clear();
LCD_Write_String(2,0,"Welcome to");
DelayMs(250);
if(tt==20)
{ tt=0;
second++;
if(second==99)second=0;
ss=second/10;
sg=second%10;
LCD_Write_Com(0x80+6);
DelayMs(20);
LCD_Write_Data(p[ss]);
DelayMs(20);
LCD_Write_Com(0x80+7);
DelayMs(20);
LCD_Write_Data(p[sg]);
DelayMs(20);
}
}
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