單片機控制舵機的C51程序

用stc89c51單片機來控制舵機的程序,測試成功，僅供大家參考.

#include "reg52.h"unsigned char count;      //0.5ms次數(shù)標(biāo)識sbit pwm =P3^0 ;          //PWM信號輸出sbit jia =P3^7;           //角度增加按鍵檢測IO口sbit jan =P3^6;           //角度減少按鍵檢測IO口unsigned char jd;         //角度標(biāo)識void delay(unsigned char i)//延時{unsigned char j,k;for(j=i;j>0;j--)for(k=125;k>0;k--);}void Time0_Init()          //定時器初始化{TMOD = 0x01;           //定時器0工作在方式1    IE   = 0x82;TH0  = 0xfe;TL0  = 0x33;     //11.0592MZ晶振，0.5msTR0=1;                 //定時器開始}void Time0_Int() interrupt 1 //中斷程序{TH0  = 0xfe;             //重新賦值TL0  = 0x33;if(count jd)              //判斷0.5ms次數(shù)是否小于角度標(biāo)識pwm=1;                  //確實小于，PWM輸出高電平elsepwm=0;                  //大于則輸出低電平count=(count+1);          //0.5ms次數(shù)加1count=count%40;     //次數(shù)始終保持為40 即保持周期為20ms}void keyscan()              //按鍵掃描{ if(jia==0)               //角度增加按鍵是否按下{delay(10);              //按下延時，消抖if(jia==0)              //確實按下{jd++;                 //角度標(biāo)識加1count=0;              //按鍵按下 則20ms周期從新開始if(jd==6)jd=5;               //已經(jīng)是180度，則保持while(jia==0);        //等待按鍵放開}}if(jan==0)                //角度減小按鍵是否按下{delay(10);if(jan==0){jd--;                 //角度標(biāo)識減1count=0;if(jd==0)jd=1;               //已經(jīng)是0度，則保持while(jan==0);}}}void main(){jd=1;count=0; Time0_Init();              while(1){keyscan();               //按鍵掃描}}