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PIC18F4550

 
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vishnuk



Joined: 08 Aug 2020
Posts: 2

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PIC18F4550
PostPosted: Tue Apr 05, 2022 1:25 am     Reply with quote

Sir,
I am using the Half-bridge code for CCP1.
How can I add dead time between each switching eg 10n-sec?

Code:

#include <18F4550.h> 
#device ADC = 10                           
#fuses NOMCLR ,HS
#use delay(clock=8M)

INT i,j;
void main()
{
char duty_cycle[100]={0,1,1,2,3,4,5,6,8,10,11,14,16,18,21,23,26,29,32,35,38,41,44,47,50,53,
56,59,62,65,68,71,74,77,79,82,84,86,89,90,92,94,95,96,98,98,99,100,
100,100,100,100,99,98,98,96,95,94,92,90,89,86,84,82,79,77,74,71,68,
65,62,59,56,53,50,47,44,41,38,35,32,29,26,23,21,18,16,14,11,10,8,6,5,
4,3,2,2,2,1,0};

setup_timer_2(T2_DIV_BY_1,100,1);
setup_ccp1(CCP_PWM | CCP_PWM_HALF_BRIDGE);   
while(true)
      {
         if (interrupt_active(INT_TIMER2))
            {
               clear_interrupt(INT_TIMER2);             
               i++;
               if(i==100) {i=0; j++; if(j==2) j=0;}             
            }     
        set_pwm1_duty(duty_cycle[i]);
      }
}
PCM programmer



Joined: 06 Sep 2003
Posts: 21647

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PostPosted: Tue Apr 05, 2022 1:55 am     Reply with quote

Enter the deadtime amount after a comma. Example:
Code:
setup_ccp1(CCP_PWM | CCP_PWM_HALF_BRIDGE, 1);
Ttelmah



Joined: 11 Mar 2010
Posts: 17988

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PostPosted: Tue Apr 05, 2022 10:09 am     Reply with quote

Be aware that a single count will give 500nSec deadband at this clock rate.
The count is in instruction cycles.
You can't get a short delay like 10nSec.
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