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18F2523 and PWM with CCP2 Module

 
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nilsener



Joined: 06 Dec 2005
Posts: 59

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18F2523 and PWM with CCP2 Module
PostPosted: Fri Jul 11, 2014 7:31 am     Reply with quote
18F2523
PCWH 4.014

Dear,

I have a PWM signal at CCP1 Pin (RC2) that is running very well. To set the PWM, I use:

Code:

setup_timer_2(T2_DIV_BY_4, 255, 1);
setup_ccp1(CCP_PWM);
set_pwm1_duty(value);


Now I want to add an other PWM (with same frequency) on CCP2 Pin (RC1) but it fails. I want to use:

Code:

setup_ccp2(CCP_PWM);
set_pwm2_duty(value);


but the compiler says "Undefined identifier set_pwm2_duty" and "Undefined identifier setup_ccp2".

Somebody with an idea how to activate PWM at CCP2 pin?

Thanks for any help
Nilsener
Ttelmah



Joined: 11 Mar 2010
Posts: 19513

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PostPosted: Fri Jul 11, 2014 8:09 am     Reply with quote
I'd have to say 'get a new compiler'.

4.014, was when V4, was still beta at best. It was something like 4.050 before it started to work even remotely 'right'.

I kept 3.249, then the next one I felt worth retaining was in the high .060's for V4...

For many months, there was a 'sticky' at the top of this forum as people tried the new releases, and found successive problems.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Jul 13, 2014 4:27 pm     Reply with quote
Here's a work-around if you don't want to upgrade. You should upgrade
because 4.014 isn't a great version, but if you don't want to, this will help.

Since setup_ccp2() and set_pwm2_duty() don't exist in vs. 4.014 for
the 18F2523, I just copied the ASM code and put it in a macro wrapper.
I included the feature of 8/10-bit pwm selection by checking the size of the
input parameter in the macro.

There is demo code to ramp the PWM duty cycle from 0 to 100% for both
8 and 10 bit modes. I didn't have an 18F2523 to test it, so I used an
18F4431 which is in the same family. It works. I did test it with vs. 4.014.
My goal was to get ASM code that looked the same as the CCS library
code. The demo shows PWM channels 1 and 2 so you can compare the
library code PWM (used on ch 1) to the macro code on ch 2. They produce
identical waveforms.
Code:

#include <18F2523.h>
#fuses INTRC_IO, BROWNOUT, PUT, NOWDT
#use delay(clock=4M)

//----------------------------
// This macro creates the set_pwm2_duty() function
// which doesn't exist in vs. 4.014 for the 18F2523.

#byte CCPR2L = 0xFBB
#byte CCPR2H = 0xFBC
#byte CCP2CON = 0xFBA
int16 duty;
int8 temp;
#define BYTE_PTR(x) &(int8 *)(x)

#define set_pwm2_duty(value) \
duty = value;                \
if(sizeof(value) == 1)       \
   CCPR2L = duty;            \
else                         \
  {                          \
   #asm                      \
   RRCF   BYTE_PTR(duty)+1,F \
   RRCF   duty,F             \ 
   RRCF   BYTE_PTR(duty)+1,F \
   RRCF   duty,F             \
   RRCF   BYTE_PTR(duty)+1,F \
   MOVFF  01,CCPR2L          \
   RRCF   BYTE_PTR(duty)+1,F \
   RRCF   BYTE_PTR(duty)+1,W \
   ANDLW  30                 \
   MOVWF  temp               \
   MOVF   CCP2CON,W          \
   ANDLW  0xCF               \
   IORWF  temp,W             \
   MOVWF  CCP2CON            \
   #endasm                   \
  }                         


//----------------------------------------------------
// This macro creates the setup_ccp2() function which
// doesn't exist in vs. 4.014 for the 18F2523.

#define setup_ccp2(mode)   \ 
output_low(PIN_C1);        \ 
CCP2CON = mode   
       

//===================================
void main()
{
int8 duty8;
int16 duty16;
int16 i;

// Back off the PR2 value to 254 so we can get 100% duty cycle.
setup_timer_2(T2_DIV_BY_4, 254, 1);

setup_ccp1(CCP_PWM);
setup_ccp2(CCP_PWM);

// Ramp the duty cycle from 0 to 100% for 10-bit and 8-bit pwm.

// 10-bit pwm
for(i = 0; i < 1024; i++)
   {
    duty16 = i;
    set_pwm1_duty(duty16);
    set_pwm2_duty(duty16);
    delay_ms(10);
   }

delay_ms(5000);

// 8-bit pwm

for(i=0; i < 256; i++)
   {
    duty8 = (int8)i;
    set_pwm1_duty(duty8);
    set_pwm2_duty(duty8);
    delay_ms(50);
   }


while(1);
}
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