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/* Main.c file generated by New Project wizard
*
* Created: 周六 5月 30 2020
* Processor: AT89C51
* Compiler: Keil for 8051
*/
#include<reg51.h>
#define uint unsigned int
#define uchar unsigned char
unsigned char num1;
unsigned char dis;
unsigned char code nondis[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};//0-9
uchar time;
double count=70; //定義占空比，并初始占空比為70%
sbit PWM=P0^0; //P0^0口輸出PWM
sbit key_add=P3^4; //加的按鍵
sbit key_dec=P3^5; //減的按鍵
void delayxms(uint z); //延時
void Motor_add(); //增加占空比
void Motor_dec(); //減少占空比
void timer0_init(); //定時器0初始化
//顯示函數(shù)
void display()
{
unsigned char gewei,shiwei,baiwei;
baiwei=num1/100;
gewei=num1%10;
shiwei=(num1/10)%10;
P2=nondis[gewei];//個位
P0=0x80;
delayxms(1);
P2=0xff;
P2=nondis[shiwei];//十位
P0=0x40;
delayxms(1);
P2=0xff;
P2=nondis[baiwei];//百位
P0=0x20;
delayxms(1);
P2=0xff;
}
void main()
{
timer0_init();
delayxms(5);
while(1)
{
Motor_add();
Motor_dec();
num1 = count;
display();//顯示函數(shù)
}
}
//延時xms程序
void delayxms(uint z) //延時xms程序
{
uint x,y;
for(y=z;x>0;x--)
for(y=110;y>0;y--);
}
//加
void Motor_add()
{
if(key_add==0)
{
delayxms(2); //此處時間不能太長，否者會的中斷產(chǎn)生沖突
if(key_add==0)
{
count+=2; //每按一次加速按鍵占空比加2
if(count>=98) //限定占空比上限
{
count=98;
}
}
while(!key_add);
}
}
//減
void Motor_dec()
{
if(key_dec==0)
{
delayxms(2);//此處時間不能太長
if(key_dec==0)
{
count-=2; //每按一次減速按鍵占空比減2
if(count<=25) //限定占空比下限
{
count=25;
}
}
while(!key_dec);
}
}
/***********定時器0初始化***********/
void timer0_init()
{
TMOD=0x01; //定時器0工作于方式1
TH0=(65536-10)/256;
TL0=(65536-10)%256;
TR0=1;
ET0=1;
EA=1;
}
/**************定時0中斷處理******************/
void timer0_int() interrupt 1
{
TR0=0; //設置定時器初值期間，關閉定時器
TH0=(65536-10)/256;
TL0=(65536-10)%256;
TR0=1;
time++;
if(time<count) //count為占空比
{
PWM=1; //輸出高電平
}
else
PWM=0;
if(time>=100)//20khz
{
time=0;
}
}

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