51 MCU IO simulates PWM to control the steering of the servo-EEWORLD

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The crystal oscillator in this example is 32M

#include
#define uint unsigned int

void drive();
void delay(uint);

sbit pwm=P2^0;

uint set; //set is the steering gear angle flag
unsigned char angle; //angle is the steering gear PWM change angle

void Time0_Init() //Interrupt initialization
{
TMOD=0X01;
IE=0X82;
TH0=(65536-58)/256;
TL0=(65536-58)%6;
TR0=1;
}

void main() //Main function
{
set=0;
angle=23; // Changing the value of angle can change the duty cycle of the servo

Time0_Init();

for(;;)
   {
     drive();
    }
}

void drive() //Motor drive routine, change duty cycle
{

angle=12;
delay(800);

angle=52;
delay(800);

angle=135;
delay(800);
}

void delay(uint x)
{
uint i,j;
for(i=x;i>0;i--)
for(j=110;j>0;j--);
}

void T0_time()interrupt 1 //100HZ,10MS
{

TH0=(65536-58)/256;
TL0=(65536-58)%6;

if(set pwm=1;
else
pwm=0;
set++;
if(set>385) set=0; //Servo duty cycle

}

Reference address：51 MCU IO simulates PWM to control the steering of the servo

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