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12F1840 PWM fail

 
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705150



Joined: 25 Apr 2013
Posts: 14

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12F1840 PWM fail
PostPosted: Tue Aug 12, 2014 8:18 am     Reply with quote

i can not make the CCP1 function to work on A5, it works on A2
if anyone have any kind of solution.
compiler is 5.008

Code:
#include <12F1840.h>
//#device adc=10
#fuses INTRC_IO,noWDT,NOPUT,NOPROTECT,NOCPD,noMCLR, noBROWNOUT,nolvp, HS
#use delay(internal=32000000)
#byte APFCON = 0x01 //CCP on RA5
#int_timer2
void updateClock() { ctime++; }

void main(void) {
   enable_interrupts(GLOBAL);
   enable_interrupts(INT_TIMER2);
                setup_timer_2(T2_DIV_BY_1,255,1);    
   //setup_ccp1(CCP_PWM);
   setup_ccp1(CCP1_A5);
   set_pwm1_duty(500);
   while(1)
   {
      count++;
      set_pwm1_duty(count*500);
      //if (count) output_high(pin_a5);
         //else output_low(pin_a5);
      delay_ms(1000);
   }
}

thank you in advance
PCM programmer



Joined: 06 Sep 2003
Posts: 20360

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PostPosted: Tue Aug 12, 2014 11:54 am     Reply with quote

The code shown below will output a PWM signal (3.9 KHz squarewave)
on pin A5. I tested this with vs. 5.026. I don't know if it works with
your version.
Code:

#include <12F1840.h>
#fuses INTRC_IO, NOWDT, BROWNOUT, PUT
#use delay(clock=4M)

#bit CCP1SEL = getenv("BIT:CCP1SEL")

//======================================
void main()
{

/*
// This puts PWM on Pin A2.
setup_ccp1(CCP_PWM);
setup_timer_2(T2_DIV_BY_1, 255, 1); 
set_pwm1_duty(128);
*/

// This puts PWM on Pin A5.
setup_ccp1(CCP_PWM);
CCP1SEL = 1;       // Get PWM output on pin A5
output_drive(PIN_A5);
setup_timer_2(T2_DIV_BY_1, 255, 1); 
set_pwm1_duty(128);

while(1);
}
705150



Joined: 25 Apr 2013
Posts: 14

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PostPosted: Wed Aug 13, 2014 9:19 am     Reply with quote

Thank you very much "PCM programmer" for your reply, it works, i can now continue from this sample program in what i need.

Have a pleasant day
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