单片机控制舵机的C51程序

用stc89c51单片机来控制舵机的程序,测试成功，仅供大家参考.

#include "reg52.h"unsigned char count;      //0.5ms次数标识sbit pwm =P3^0 ;          //PWM信号输出sbit jia =P3^7;           //角度增加按键检测IO口sbit jan =P3^6;           //角度减少按键检测IO口unsigned char jd;         //角度标识void delay(unsigned char i)//延时{unsigned char j,k;for(j=i;j>0;j--)for(k=125;k>0;k--);}void Time0_Init()          //定时器初始化{TMOD = 0x01;           //定时器0工作在方式1    IE   = 0x82;TH0  = 0xfe;TL0  = 0x33;     //11.0592MZ晶振，0.5msTR0=1;                 //定时器开始}void Time0_Int() interrupt 1 //中断程序{TH0  = 0xfe;             //重新赋值TL0  = 0x33;if(count jd)              //判断0.5ms次数是否小于角度标识pwm=1;                  //确实小于，PWM输出高电平elsepwm=0;                  //大于则输出低电平count=(count+1);          //0.5ms次数加1count=count%40;     //次数始终保持为40 即保持周期为20ms}void keyscan()              //按键扫描{ if(jia==0)               //角度增加按键是否按下{delay(10);              //按下延时，消抖if(jia==0)              //确实按下{jd++;                 //角度标识加1count=0;              //按键按下 则20ms周期从新开始if(jd==6)jd=5;               //已经是180度，则保持while(jia==0);        //等待按键放开}}if(jan==0)                //角度减小按键是否按下{delay(10);if(jan==0){jd--;                 //角度标识减1count=0;if(jd==0)jd=1;               //已经是0度，则保持while(jan==0);}}}void main(){jd=1;count=0; Time0_Init();              while(1){keyscan();               //按键扫描}}