Question

用51单片机仿真计数器，用c语言写程序，LCD1602显示，具体要求:按键按下开始计时，按键再次按

Answer 1

#include<reg52.h>
sbit LCD_RS = P2^0;
sbit LCD_RW = P2^1;
sbit LCD_E_ = P2^2;
sbit KEY1   = P2^3;

void Delay_ms(unsigned char time)
{
    unsigned char i;
    while(time--)
    {
        for(i=0;i<125;i++);
    }
}
void LCD1602_WriteByte(unsigned char value,bit dataTypedef)
{
    LCD_RS = dataTypedef;
    LCD_RW = 0;
    P0     = value;
    LCD_E_ = 1;
    Delay_ms(5);
    LCD_E_ = 0;
}
void LCD1602_Init()
{
    LCD1602_WriteByte(0x38,0);
    Delay_ms(10);
    LCD1602_WriteByte(0x01,0);
    Delay_ms(10);    
    LCD1602_WriteByte(0x06,0);
        Delay_ms(10);
        LCD1602_WriteByte(0x0c,0);
        Delay_ms(10);
        
}
bit Pause;
void KEY_Testing()
{
    static bit sw;
    static unsigned char qd;
    KEY1 = 1;
    if(!KEY1)
    {
        if(!sw)qd++;
        if(qd>10)
        {
            qd = 0;
            sw = 1;
            if(!KEY1)Pause=~Pause;
        }
    }
    else
    sw = qd = 0;
}
unsigned char CountNumber;
void main()
{
    LCD1602_Init();
    TMOD = 0x01;
    TR0  = 1;
    ET0  = 1;
    EA   = 1;
    while(1)
    {
        LCD1602_WriteByte(0x85,0);
        LCD1602_WriteByte((CountNumber/100)+48,1);
        LCD1602_WriteByte((CountNumber/10%10)+48,1);
        LCD1602_WriteByte((CountNumber%10)+48,1);
    }
}
void Timer0_Routine()interrupt 1
{
    static unsigned int count;
    TH0 = 0xfc;//12MHZ
    TL0 = 0x18;
    KEY_Testing();
    if(!Pause)
    {
        count++;
        if(count>=1000)
        {
            count=0;
        }
    }
}

///如有问题，可再咨询