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Problem generating PWM signals with PIC18F46J11

 
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noxus



Joined: 16 Nov 2009
Posts: 6

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Problem generating PWM signals with PIC18F46J11
PostPosted: Wed Nov 18, 2009 9:02 am     Reply with quote
Hello All,

I'm currently trying to generate PWM signals from my PIC18F46J11 processor. I had to install the latest version of the compiler (4.099) since previous versions didn't support this processor type.

I'm using the following code sequence to generate the PWM signals:
Code:

#include <18F46J11.h>

#FUSES NOWDT       
#FUSES HS

#use delay(clock=8000000)

void main()
{
   setup_wdt(WDT_OFF);
   setup_timer_0(RTCC_INTERNAL);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DIV_BY_16,249,1);
   setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
   setup_timer_4(T4_DISABLED,0,1);

   setup_ccp1(CCP_PWM);
   set_pwm1_duty(972);
   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);
      
   while(1);
}



The code compiles fine but I do not see the signals on my scope!
Also, it is not clear to me on which pins I should see the signals. I've never worked before with a microcontroller with Peripheral Pin Select possibilities. I couldn't find a function inside the CCS compiler help file that shows me how to control the Peripheral Pin Select.

Any ideas/suggestions maybe?
Thanks...
noxus



Joined: 16 Nov 2009
Posts: 6

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PostPosted: Wed Nov 18, 2009 10:15 am     Reply with quote
Never mind - I got it working.

As I suspected it had something to do with the Peripheral Pin Select registers.
Apparently you first have to use the #pin_select function=pin_xx statement to effectively assign the PWM function to the configurable pin.

I added the following statement to my code:
Code:
#pin_select P1A=PIN_C4

Now it is working as expected.
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