STC89C52 MCU DC motor debugging

Function: Configure timer 1 to generate an interrupt every 1 millisecond. By counting the number of interrupts,
    the 0th pin of the defined P2 port generates a PWM with a duty cycle of 70%, which is used to drive the DC
    motor
Experimental board model: BS-XYD-C52
Experiment name:  DC motor test experiment
Written by:  Xie Yingdong
Written date:  2012-4-30      
/////////////////////////////////////////////////////////////////////////////
#include

#define uchar unsigned char
#define uint unsigned int

#define FOSC 12000000L
#define TIMS  (65535-FOSC/12/1000)   //Calculation method for timer interrupt 1 second in 12T mode

uchar cCount;     //Define the number of timer interrupts, in turn according to the PWM generated sbit PWM
 
=P2^0;  // Define the   pin connected to the DC motor as PWM 
/// ... This is done, so if you change the frequency of the crystal oscillator , please make corresponding changes / ... /// ... ​ ​ ​ ​ ​ ​



         
   


         



 
 
 
    
    
 

void Init_System()
{
 DelayMs(50);  //Stabilize the system
 TMOD|= 0x10;  //Set timer 1 to mode 1 (16bit)
 //PWM 
 TL1 = TIMS;   //Assign initial value to the low byte register of timer 1
 TH1 = TIMS>>8;   //Assign initial value to the high byte register of timer 1
 TR1  = 1;    //Let timer 1 start working
 ET1=1;    //Turn on the interrupt enable bit of timer 1
 EA=1;            //Enable global interrupts

 cCount  = 0 ; //       Assign initial values ​​to global variables
}
/// ... ​ ​​​​ ​ if(cCount<30)  //define duty cycle PWM =0 ; else PWM = 1 ;  } } /// ...








 
 
 
   
   
   
   
  
 

void Timer1_Routine(void) interrupt 3
{
 TL1 = TIMS;    //Reassign the low byte register of timer 1
 TH1 = TIMS>>8;    //Reassign the high byte register of timer 1
 cCount++;      //
}