CCS C PWM

main.c

#include <main.h>
/*
Cach tinh gia tri dutu thong qua set value
8bit value = period+1*duty_cycle
16bit value= 4*(period+1)*duty_cycle
*/

void main()
{
   setup_timer_2(T2_DIV_BY_4,124,1);      //100 us overflow, 100 us interrupt//Khoi tao timer 2 tao tan so pwm(10k)
   //mode T2_DIV_BY_4
  // period=124
   //Postscale =1

   //set_pwm2_duty((int16)248);//Dieu chinh do dong la 50%

   while(TRUE)
   {
     set_pwm2_duty((int16)150);//Dieu chinh do dong la 30%
     delay_ms(3000);
     set_pwm2_duty((int16)248);//Dieu chinh do dong la 50%
     delay_ms(2000);;
     setup_ccp2(CCP_OFF);//Tat PWM
     delay_ms(5000);
   }

}

main.h

#include<18f4520.h>
#device adc=16
#FUSES NOWDT                  //No Watch Dog Timer<br>
#FUSES WDT128                 //Watch Dog Timer uses 1:128 Postscale<br>
#FUSES HS                     //High speed Osc (> 4mhz for PCM/PCH) (>10mhz for PCD)
#FUSES NOBROWNOUT             //No brownout reset<br>
#FUSES NOLVP                  //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOXINST                //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#use delay(clock=20000000)