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}}