#define TH0_TL0 (65536-1000)//设定中断的间隔时长
unsigned char count0 = 50;//低电平的占空比
unsigned char count1 = 0;//高电平的占空比
bit Flag = 1;//电机正反转标志位,1正转，0反转
sbit Key_add=P2 ^ 0; //电机减速
sbit Key_dec=P2 ^ 1; //电机加速
sbit Key_turn=P2 ^ 2; //电机换向
sbit PWM1=P2^6;//PWM 通道 1，反转脉冲
sbit PWM2=P2^7;//PWM 通道 2，正转脉冲
unsigned char Time_delay;
/************函数声明**************/
void Delay(unsigned char x);
void Motor_speed_high(void);
void Motor_speed_low(void);
void Motor_turn(void);
void Timer0_init(void);
/****************延时处理**********************/
void Delay(unsigned char x)
{
Time_delay = x;
while(Time_delay != 0);//等待中断，可减少PWM输出时间间隔
}
/*******按键处理加pwm占空比，电机加速**********/
void Motor_speed_high(void)//
{
if(Key_add==0)
{
Delay(10);
if(Key_add==0)
{
count0 += 5;
if(count0 >= 100)
{
count0 = 100;
}
}
while(!Key_add);//等待键松开
}
}
/******按键处理减pwm占空比，电机减速*****/
void Motor_speed_low(void)
{
if(Key_dec==0)
{
Delay(10);
if(Key_dec==0)
{
count0 -= 5;
if(count0 <= 0)
{
count0 = 0;
}
}
while(!Key_dec );
}
}
/************电机正反向控制**************/
void Motor_turn(void)
{
if(Key_turn == 0)
{
Delay(10);
if(Key_turn == 0)
{
Flag = ~Flag;
}
while(!Key_turn);
}
}
/***********定时器0初始化***********/
void Timer0_init(void)
{
TMOD=0x01; //定时器0工作于方式1
TH0=TH0_TL0/256;
TL0=TH0_TL0%256;
TR0=1;
ET0=1;
EA=1;
}
/*********主函数********************/
void main(void)
{
Timer0_init();
while(1)
{
Motor_turn();
Motor_speed_high();
Motor_speed_low();
}
}
/**************定时0中断处理******************/
void Timer0_int(void) interrupt 1 using 1
{
TR0 = 0;//设置定时器初值期间，关闭定时器
TL0 = TH0_TL0 % 256;
TH0 = TH0_TL0 / 256 ;//定时器装初值
TR0 = 1;
if(Time_delay != 0)//延时函数用
{
Time_delay--;
}
if(Flag == 1)//电机正转
{
PWM1 = 0;
if(++count1 < count0)
{
PWM2 = 1;
}
else
PWM2 = 0;
if(count1 >= 100)
{
count1=0;
}
}
else //电机反转
{
PWM2 = 0;
if(++count1 < count0)
{
PWM1 = 1;
}
else
PWM1 = 0;
if(count1 >= 100)
{
count1=0;
}
}
}
