#include #define uchar unsigned char

#define uint unsigned int

#define delayNOP ( ) ﹛_nop_( ); _nop_( ); _nop_( ); _nop_( );﹜

//LCD控制函数

void LCD_Initialize( );

void LCD_Set_POS(uchar);

void LCD_Write_Date(uchar);

void Display_String(uchar﹡,uchar);

sbit K1 = P1^0;

sbit K2 = P1^1;

sbit BEEP = P3^0;

sbit LCD_RS = P2^0;

sbit LCD_RW = P2^1;

sbit LCD_EN = P2^2;

uchar KeyCount = 0;

uchar code msg1[] = ﹛〞Second Watch 0 〞﹜;

uchar code msg2[] = ﹛〞>>>> 0 〞﹜;

uchar code Prompts[] [16] =

{

﹛〞:: 1- - - - > 〞﹜,

﹛〞:: 1- - - - > ::2 〞﹜,

﹛〞:: 1 - >2 ::3- - > 〞﹜,

﹛〞:: 1 - >2 ::3- - >4 〞﹜

};

// 计时缓冲与显示缓冲

uchar Time_Buffer[] ={0,0,0,0};

uchar LCD_Display_Buffer[]={〞00: 00: 00:00〞};

//

// 蜂鸣器

//

void Beep ()

﹛

uchar i,j = 70;

for (i = 0;i< 180;i++ )

﹛

while(--j);BEEP = ～BEEP;

﹜

BEEP = 0;

﹜

//

// 延时

//

void DelayX(uint ms)

{

uchar i;

while(ms--) for (i= 0;i< 120;i++);

﹜

//

// 显示计时

//

void Show_Second( )

{

uchar i;

LCD_Set_POS(0x45); //设置LCD显示起点

for(i = 3;i != 0xff ;i--);

{

//将两位整数的1/100s，秒，分，时转换为8位数字字符

LCD_Display_Buffer[2﹡i+1] = Time_Buffer[i] / 10 + ˊ0 ˊ;

LCD_Display_Buffer[2﹡i] = Time_Buffer[i] % 10 + ˊ0 ˊ;

//在 = 3,2,1,0时分别显示时，分，秒，1/100s

LCD_Writer_Date(LCD_Display_Buffer[2﹡i+1])

LCD_Writer_Date(LCD_Display_Buffer[2﹡i])

LCD_Writer_Date(ˊ: ˊ)

}

}

//

// Time0中断

//

Void Time0( ) interrupt 1 using 0

{

THO = -10000 / 256;

TLO = -10000 % 256;

Time_Buffer[0] ++

if(Time_Buffer[0] == 100)

{

Time_Buffer[0] = 0; Time_Buffer[1]++;

}

if(Time_Buffer[1] == 60) //秒

{

Time_Buffer[1] = 0; Time_Buffer[2]++;

}

if(Time_Buffer[2] == 60) //分

{

Time_Buffer[2] = 0; Time_Buffer[3]++;

}

if(Time_Buffer[3] == 24) //时

Time_Buffer[3] = 0;

}

//

//主函数

//

void main( )

{

uchar i;

IE = 0x82;

TMOD = 0x01;

THO = -10000 / 256;

TLO = -10000 % 256;

LCD_Initialize( );

Display_String(msg1,0x00);

Display_String(msg2,0x40);

While(1)

{

if(k1 == 0)

{

DelayX(100);

i = ++KeyCount;

switch (i)

{

case 1:

case 3: TRO = 1;

Display_String(Prompts[i-1],0);

Break;

case 2:

case 4: TRO = 0;

Display_String(Prompts[i-1],0);

break;

default:TRO = 0;

break;

}

While (K1 == 0); // 等待释放K1键

Beep( );

}

else

if(K2 == 0)

{

TRO = 0;

KeyCount = 0;

for(i = 0;i < 4; i++)

Time_Buffer [i] = 0; // 清零计数缓冲

Display_String(msg1,0);

Beep( );

DelayX(100);

while (K2 == 0); // 等待释放K2键

}

Show_Second( );

}

}

//

// 1602LCD显示驱动函数

//

#include 〈reg51.h〉

#include 〈intrins.h〉

#define uchar unsigned char

#define uint unsigned int

#define DellayNOP( )﹛_nop_( ); _nop_( ); _nop_( ); _nop_( );﹜

sbit LCD_RS = P2^0;

sbit LCD_RW = P2^1;

sbit LCD_EN = P2^2;

bit LCD_Busy_Check( );

void LCD_Initialize( );

void LCD_Set_POS(uchar);

void LCD_Write_Command(uchar);

void LCD_Write_ Date(uchar);

//

// 延时

//

void DelayMS(uint ms)

{

uchar t;

while(ms--) for (t =0;t < 120;t++);

}

//

// LCD忙检查

//

bit LCD_Busy_Check( );

{

bit Rsult;

LCD_RS = 0; LCD_RW = 1; LCD_EN = 1;DelayNOP( );

Result = (bit)(p0 ﹠ 0x80);

LCD_EN = 0

return Result;

}

//

// 向LCD写指令

//

void LCD_Write_Command(uchar cmd);

{

while(LCD_Busy_Check() );

LCD_RS = 0; LCD_RW = 0; LCD_EN = 0;

_nop_( ); _nop_( );

pO = cmd; DelayNOP( );

LCD_EN = 1;DelayNOP( );

LCD_EN = 0;

}

//

// 向LCD写数据

//

void LCD_Write_Date(uchar str);

{

while(LCD_Busy_Check() );

LCD_RS = 1; LCD_RW = 0; LCD_EN = 0;pO = str; DelayNOP( );

LCD_EN = 1;DelayNOP( );LCD_EN = 0;

}

//

// 初始化LCD

//

void LCD_Initialize( );

{

DelayMS(5); LCD_Write_Command(0x38);

DelayMS(5); LCD_Write_Command(0x0c);

DelayMS(5); LCD_Write_Command(0x06);

DelayMS(5); LCD_Write_Command(0x01);

DelayMS(5);

}

//

// 设置显示位置

//

void LCD_Set_POS(uchar Poition)

{

LCD_Write_Command(Position ︱ 0x80);

}

//

//显示函数，在LCD指定行上显示字符串

//

void Display_String(uchar﹡str,uchar LineNO)

{

uchar k;

LCD_Set_POS(LineNO);

for (k = 0;k < 16;k++) LCD_Write_Date(str[k])

}