PHILIPS 51LPC系列单片机解析方案

动越快，反之则越慢;电机停转，LED 熄灭。此电路稍经修改就可以用于其它许多类似的场合。

源程序清单：

该软件在Keil C51 V6.02上编译通过，在目标板上运动正常。如果用其它编译器必须稍加修改。

#include

#define uchar unsigned char

#define uint unsigned int

uchar s,x,y=0;

void timer0(void)interrupt 1 using 1 {/*T0中断服务程序*/

x=x+1;

if(x/10>s){

if(y= =0){P1=P10xfb; /*LED点亮*/

x=0;y=1;}

else {P1=P1|0x04; /*LED熄灭*/

y=0;x=0;}}

TF0=0;TH0=-(28/256);

TL0=-(28%256);

}

void speed(s){ /*电机转换控制子程序*/

uchar pulsecount, pulseduration=0;

uint i=0;

uint j=0;

if (((CMP10x02))!(CMP20x02)/*查询比较器*/

{for (i=0;i

{for(j=0;j210;j++) ;} /*延时触发*/

CMP1=CMP10xfc;

CMP2=CMP20xfc;

pulsecount=1;

{P1=P10xfe;

pulseduration=12; /*触发脉冲宽度*/

while(pulseduration){pulseduration- -;}

P1=P1|0x01;

pulsecount- -;

}

}

}

void Initcomparatior(void){ //初始化P87LPC761//

PT0AD=0x6f; /*禁止P0口的数字功能*/

P0=0xff;

P0M1=0x2a; /*P01，P03，P05设为高阻输入*/

P0M2=0xd5; /*P00，P04，P06设为推挽方式*/

P1=0xff;

P1M1=0x82; /*P17用于VZC检测*/

P1M2=0x05;

CMP1=0x34;

CMP2=0x34;

}

void main(void)

{uchar pulsecount ,pulseduration=0x00;

uint j;i=0;

SP=0x5f;EA=0;

TH0=-(28/256);

TL0=-(28%256);

TF0=0;EA=0;TR0=0;

ET0=1;CMP1=CMP2=0;

Initcomparator();

CMP1=CMP10xfc;

CMP2=CMP20xfc;s=0;

while(P1_1) {;}

while(!P1_1){;}

while(P10x80){};

while(!(P10x80)){};

while(P10x80){}

while(!(P10x80)){};

while(P10x80){};

P1=P10xfe; //启动电机

while(1)

{if(P1_1= =0) {

x=0;

while (!x){;}

if(P1_1=0)

{P1=0xff;s=s+1;} //停止电机

if(s= =8){s=0;}

while(!P1_1){;} //等待释放按键

while(P10x80){};

while(!(P10x80)){};

while(P10x80)();

whie(!(P10x80)){};

while(P10x80){};

P1=P10xfe;} //启动电机

EA=1;TR0=1;

speed(s); }

} //结束