C51课程列表

单片机入门必学的一些课程

• C51芯片介绍
• 安装编程软件Keil C
• 仿真软件或硬件驱动
• 新建项目
• 程序初步
• 点亮一个LED
• 流水灯
• 让7段数码管显示数字1-9
• 做一个按键计数器
• 做一个计时器
• 综合实验：做一个按键电子时钟
• 串口通信

电子时钟

#include <Reg52.h >

sbit key1=P3^1;
sbit key2=P3^0;
sbit key3=P3^2;
sbit key4=P3^3;

char a[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
int n=0;
int cc = 0;
int T1MS = 65536-50000;
int hour;
int minute;
int second;
void disp_time(int hour, int minute, int second);
void init_interrupt();

void delay(int i)
{
	int x,y;
	for(x=0;x < i;x++)
		for(y=0;y<255;y++);
}


void disp_time(int hour, int minute, int second)
{
	P0 = 0x00;
	P2=0xFF;//111(1 11)11
	P0=a[hour/10];
	delay(1);
	
	P0 = 0x00;
	P2=0xFB;//111(1 10)11
	P0=a[hour%10];
	delay(1);
	
	P0 = 0x00;
	P2=0xF3;//111(1 00)11
	P0=a[minute/10];
	delay(1);
	
	P0 = 0x00;
	P2=0xEF;//111(0 11)11
	P0=a[minute%10];
	delay(1);
	
	P0 = 0x00;
	P2=0xE7;//111(0 01)11
	P0=a[second/10];
	delay(1);
	
	P0 = 0x00;
	P2=0xE3;//111(0 00)11
	P0=a[second%10];
	delay(1);
}

void main()
{
	init_interrupt();
	while(1)
	{
		disp_time(hour,minute,second);
		if(key1==0)
		{
			delay(1);
			if(key1==0)
			{
				hour+=1;
			}
			while(key1==0);
		}
		if(key2==0)
		{
			delay(1);
			if(key2==0)
			{
				minute+=1;
			}
			while(key2==0);
		}
		if(key3==0)
		{
			delay(1);
			if(key3==0)
			{
				second+=1;
			}
			while(key3==0);
		}
		if(key4==0)
		{
			delay(1);
			if(key4==0)
			{
				hour=0;
				minute=0;
				second=0;
			}
		}
	}
}

void init_interrupt()
{
	TMOD = 0x00;
	TL0 = T1MS%256;
	TH0 = T1MS/256;
	TR0=  1;
	ET0 = 1;
	EA = 1;
}

void T0_interrupt() interrupt 1
{
	TL0 = T1MS%256;
	TH0 = T1MS/256;
	cc++;
	if (cc > =80)
	{
		cc = 0;
		second++;
	}
	if(second==60)
	{
		second=0;
		minute+=1;
	}
	if(minute==60)
	{
		minute=0;
		hour+=1;
	}
	if(hour==24)
	{
		hour=0;
		minute=0;
		second=0;
	}
}

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