main.c

交通灯（加数码管）

/*
标题：范例 5-1
版本：1.0
Target：89S51
程序描述：这个范例说明如何使用8051 的Port 1连接到四颗七段显示器，PORT 0的低4位分别控制这四颗共阳七段显示器，让四颗共阳七段显示器使用扫描的方式轮流显示数字。这四颗七段显示器将显示出自数字时钟PORT 2的P2.0和P2.1分别连接到2个弹跳按钮。*/
/* ***************************************************** */
#include <REGX51.H>
#define   TIMER0_COUNT	-2000//0xEE18 
                            /*10000h-(12,000,000/(12*200)) */
#define   ON            0
#define   OFF           1

#define   HighChoose	P0_3
#define   LowChoose		P0_7

#define   NorthCount	P1
#define   NorthRed		P0_0
#define   NorthYellow	P0_1
#define   NorthGreen	P0_2


#define   WestCount		P2
#define   WestRed		P0_4
#define   WestYellow	P0_5
#define   WestGreen		P0_6

#define   Speed			21			//动态刷新速度

const number[10]	= {0XC0,0XF9,0XA4,0XB0,0X99,0X92,0X82,0XF8,0X80,0X90};
const scan[4]		= {0X0E,0X0D,0X0B,0X07};
static unsigned char timecount	= 0;
static unsigned int timetrick	= 0;
static unsigned char northnum	= 0;
static unsigned char westnum	= 0;
static void timer0_isr(void) interrupt 1 using 1
{
	TR0=0;
	TL0=(TIMER0_COUNT & 0x00FF);
	TH0=(TIMER0_COUNT >> 8);
	TR0=1;
	timetrick++;
	if(northnum < 10&&westnum < 10)
	{
		LowChoose	= OFF;
		HighChoose	= ON;
		NorthCount	= number[northnum%10];
		WestCount	= number[westnum%10];
	}
	else
	{
		if(timetrick%Speed==0)
		{
			if((timetrick/Speed)%3!=0)
			{
				LowChoose	= OFF;
				HighChoose	= ON;
				NorthCount	= number[northnum%10];
				WestCount	= number[westnum%10];
				
	
			}
			else
			{
				LowChoose	= ON;
				HighChoose	= OFF;
				if(northnum >= 10)
					NorthCount	= number[northnum/10];
				else
					NorthCount	= 0xff;
				if(westnum >= 10)
					WestCount	= number[westnum/10];
				else
					WestCount	= 0xff;

			}
		}
	
	}
	

	

			

	if(timetrick==500)
	{
		timecount++;
		northnum--;
		westnum--;
		switch(timecount)
		{
		case 13:
			NorthRed	= OFF;
			NorthYellow	= ON;
			NorthGreen	= OFF;
			WestRed		= ON;
			WestYellow	= OFF;
			WestGreen	= OFF;
			northnum	= 3;
			break;
		case 16:
			NorthRed	= ON;
			NorthYellow	= OFF;
			NorthGreen	= OFF;
			WestRed		= OFF;
			WestYellow	= OFF;
			WestGreen	= ON;
			northnum	= 16;
			westnum		= 13;
			break;
		case 29:
			NorthRed	= ON;
			NorthYellow	= OFF;
			NorthGreen	= OFF;
			WestRed		= OFF;
			WestYellow	= ON;
			WestGreen	= OFF;
			westnum		= 3;
			break;
		case 32:
			NorthRed	= OFF;
			NorthYellow	= OFF;
			NorthGreen	= ON;
			WestRed		= ON;
			WestYellow	= OFF;
			WestGreen	= OFF;
			northnum	= 13;
			westnum		= 16;
			break;
		}
		timecount	%=	32;
		timetrick = 0;
	}
}
static void timer0_initialize(void)
{
	EA		= 0;
	TR0		= 0;
	TMOD 	= 0x01;
	TL0		= TIMER0_COUNT % 256;
	TH0		= TIMER0_COUNT / 256;
	PT0		= 0;
	ET0		= 1;
	TR0		= 1;
	EA		= 1;
}
void traffic_initialize(void)
{
	NorthRed	= OFF;
	NorthYellow	= OFF;
	NorthGreen	= ON;
	WestRed		= ON;
	WestYellow	= OFF;
	WestGreen	= OFF;

	northnum	= 13;
	westnum		= 16;

}
void main (void)
{
	traffic_initialize();
	timer0_initialize();

	while (1);                         /*无穷循环 */
}