一、题目

制作一个简易频率计

二、代码

#include <stc8h.h>
#include <intrins.h>

u16 counter=0;
u8 cnt=0;
sbit key=P3^2;

u8 code t_display[]={                       //标准字库
//   0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F
    0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71};    //0. 1. 2. 3. 4. 5. 6. 7. 8. 9. -1

u8 code T_COM[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};      //位码


void gpio()		//gpio初始化为准双向口，刚开始除了P30，P31其他均为高阻态
{
    P0M1 = 0x00;   P0M0 = 0x00;   //设置为准双向口
    P1M1 = 0x00;   P1M0 = 0x00;   //设置为准双向口
    P2M1 = 0x00;   P2M0 = 0x00;   //设置为准双向口
    P3M1 = 0x00;   P3M0 = 0x00;   //设置为准双向口
    P4M1 = 0x00;   P4M0 = 0x00;   //设置为准双向口
    P5M1 = 0x00;   P5M0 = 0x00;   //设置为准双向口
    P6M1 = 0x00;   P6M0 = 0x00;   //设置为准双向口
    P7M1 = 0x00;   P7M0 = 0x00;   //设置为准双向口
}

void TimerInit(void)	
{
	TMOD=0x40;
	TL0=(65536-50000)%256;
	TH0=(65536-50000)/256;
	TH1=0x00;
	TL1=0x00;
	ET0=1;
	EA=1;
}

void Delay(u8 num)		//@24.000MHz
{
	unsigned char i, j;

	u8 k;
	for(k=0; k<num;k++)
	{
		_nop_();
		i = 32;
		j = 40;
		do
		{
			while (--j);
		} while (--i);
	}
}

void Nixie(u8 i, u8 j)
{
	P7=~T_COM[i-1];
	P6=~t_display[j];
	Delay(1);
	P6 = 0xFF;
}

void Start(void)
{
	if(key==0)
	{
		TR0=1;
		TR1=1;
	}else
	{
		TR0=0;
		TR1=0;
	}
}

void main()
{
	gpio();
	TimerInit();
	

		
	while(1)
	{
		P35=~P35;
		Start();
		Nixie(1,0);
		Nixie(2,0);
		Nixie(3,0);
		Nixie(4,0);
		Nixie(5,0);
		Nixie(6,0);
		Nixie(7,0);
		Nixie(8,0);
	}
}

void T0()	interrupt	1
{
	cnt++;
	if(cnt==20)
	{
		cnt=0;
		counter=(TH1<<8)+TL1;
		Nixie(7,counter%10);
		Nixie(6,counter/10%10);
		Nixie(5,counter/100%10);
		Nixie(4,counter/1000%10);
		Nixie(3,counter/10000%10);
		TR1=0;
		TL1=0;
		TH1=0;
		TR1=1;
	}
}