[嵌入式]基于51单片机的扫描数码管时钟

/*本程序为基于扫描数码管的时钟程序
1、矩阵键盘可设定时间。
2、矩阵键盘接P2口。
3、数码管段选接P1口。
4、38译码器A,B,C依次为P3.0,P3.1,P3.2。*/
#include<reg51.h>
void delay(int a,int b)
{
	int i,j;
	for(i = 0;i <= a;i ++)
	{
		for(j = 0;j <= b;j ++)
		{}
	}
}
int main()
{
	int i,h1,h2,m1,m2,s1,s2;
	int Number[]={0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff};  //选择是哪一个数码管发光
	int number[]={~0xc0,~0xf9,~0xa4,~0xb0,~0x99,~0x92,~0x82,~0xf8,~0x80,~0x90,0x40};//数码管显示的数字
	i = 50;
	h1 = 0;h2 = 0;m1 = 0;m2 = 0;s1 = 0;s2 = 0;
	while(1)
	{
		/*按键检测程序*/
		P2 = 0Xfe;
		if(P2 == 0xee)
		{
			delay(5,20);
			if(P2 == 0xee)
			{
				h1 ++;
				if(h1 == 3)
				{
					h1 = 0;
				}
			}
		}
		if(P2 == 0xde)
		{
			delay(5,20);
			if(P2 == 0xDe)
			{
				h2 ++;
				if(h2 == 5)
				{
					h2 = 0;
				}
			}
		}
		if(P2 == 0xbe)
		{
			delay(5,20);
			if(P2 == 0xbe)
			{
				m1 ++;
				if(m1 == 6)
				{
					m1 = 0;
				}
			}
		}
		if(P2 == 0x7e)
		{
			delay(5,20);
			if(P2 == 0x7e)
			{
				m2 ++;
				if(m2 == 10)
				{
					m2 = 0;
				}
			}
		}
		delay(5,20);
		/*时钟显示程序*/
		while(i --)
		{
			P3 = Number[0];P1 = number[h1];delay(13,10);P1 = 0x00;
			P3 = Number[1];P1 = number[h2];delay(13,10);P1 = 0x00;
			P3 = Number[2];P1 = number[10];delay(13,10);P1 = 0x00;
			P3 = Number[3];P1 = number[m1];delay(13,10);P1 = 0x00;
			P3 = Number[4];P1 = number[m2];delay(13,10);P1 = 0x00;
			P3 = Number[5];P1 = number[10];delay(13,10);P1 = 0x00;
			P3 = Number[6];P1 = number[s1];delay(13,10);P1 = 0x00;
			P3 = Number[7];P1 = number[s2];delay(13,10);P1 = 0x00;
		}
		i = 50;//控制数码管保持时间，用于延时控制。
		/*进位程序：分钟个位满10进一，分钟十位满6进一；
		小时个位满10进一，到达24规零；秒个位满十进一，秒十位满六进一*/
		s2 ++;
		if(s2 == 10)
		{
			s2 = 0;
			s1 ++;
			if((s1 == 6))
			{
				m2 ++;
				s1 = 0;s2 = 0;
				if(m2 == 10)
				{
					m2 = 0;
					m1 ++;
					if((m1 == 6))
					{
						h2 ++;
						if((h1 == 2)&&(h2 == 4))
						{
							h1 = 0;h2 = 0;m1 = 0;m2 = 0;s1 = 0;s2 = 0;
						}
						m1 = 0;m2 = 0;
						if((h2 == 10)&&(h1 != 2))
						{
							h2 = 0;
							h1 ++;
							if((h1 == 2)&&(h2 == 4))
							{
								h1 = 0;h2 = 0;m1 = 0;m2 = 0;s1 = 0;s2 = 0;
							}
						}
					}
				}
			}
		}
	}
}