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16F1825 Compare Module

 
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acm45



Joined: 29 Dec 2008
Posts: 18
Location: Italy

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16F1825 Compare Module
PostPosted: Thu Dec 08, 2011 1:10 pm     Reply with quote
Hi all!

I'm having some trouble using the compare module of a 16F1825.
From the datasheet I know that the compare module uses the timer1, so I want to count the Timer0 overflows, I tried lots of configurations (setup_timer1(...)) but without results Sad
Also changed the chip but same result!

I want to toggle output pins when timer1 equals CCPR1 & CCPR2, when equal to CCPR4 the timer is erased.
The code uses the internal oscillator but I also tried with an external xt.
If working, this is a quadrature encoder simulator.

Here's the code, I'm using CCS v. 4.114.

Code:

#include <main.h>

#define CCP_COMPARE_TOGGLE_OUTPUT      0x2


// PIN Inversion Register
#byte APFCON0 =   getenv("SFR:APFCON0")
#bit RXDTSEL   = APFCON0.7
#bit SDOSEL   = APFCON0.6
#bit SSSEL   = APFCON0.5
#bit T1GSEL   = APFCON0.3
#bit TXCKSEL   = APFCON0.2

#byte APFCON1 =   getenv("SFR:APFCON1")
#bit P1DSEL = APFCON1.3
#bit P1CSEL = APFCON1.2
#bit P2BSEL = APFCON1.3
#bit CCP2SEL = APFCON1.0



unsigned long int c1, c2;

#int_CCP4
void  CCP4_isr(void)
{
   CCP_1 = c1;
   CCP_2 = c2;
   CCP_4 = c2;
}


void main()
{
   setup_oscillator(OSC_8MHZ|OSC_INTRC|OSC_PLL_OFF,0);
   // Swap pins...
      RXDTSEL = 1;
      SDOSEL = 0;
      SSSEL = 0;
      T1GSEL = 0;
      TXCKSEL = 1;
      
      P1DSEL = 0;
      P1CSEL = 0;
      P2BSEL = 0;
      CCP2SEL = 0;
      
   set_timer1(0);
   setup_timer_0(T0_INTERNAL | T0_DIV_1); // Timer0 is ok!

// Timer 1 never increase!
   setup_timer_1(T1_GATE_TIMER0| T1_GATE_SINGLE | T1_GATE_INVERTED);
     setup_ccp1(CCP_COMPARE_TOGGLE_OUTPUT);
      setup_ccp2(CCP_COMPARE_TOGGLE_OUTPUT);
      setup_ccp4(CCP_COMPARE_RESET_TIMER);
      setup_comparator(NC_NC_NC_NC);// This device COMP currently not supported by the PICWizard
   
   set_tris_a(0xFE);
   set_tris_c(0x57);
   
   c1 = 0x100;
   c2 = 0x200;
   
   CCP_1 = c1;
   CCP_2 = c2;
   CCP_4 = c2;

   enable_interrupts(INT_TIMER0);
   enable_interrupts(INT_TIMER1_GATE);
   enable_interrupts(INT_CCP4);
   enable_interrupts(GLOBAL);
   
   while(1)
   {
     if (input(PIN_C1)==1)
      {   
         if (c1 > 0x100)
         {   
          c1=c1-100;
          c2 = c2-100;
      }
      delay_ms(50);
   }
   
   if (input(PIN_C2)==1)
      {   
         if (c1 <= 0x7FFF)
         {   
          c1=c1+100;
          c2=c2+100;
      }
      delay_ms(50);

   }
   }
}

///////////////// MAIN.H

#include <16F1825.h>
#device ICD=TRUE

#FUSES NOWDT                    //No Watch Dog Timer
#FUSES INTRC_IO                 
//#FUSES NOWDT_SW               
#FUSES NOPUT                    //No Power Up Timer
#FUSES MCLR                     //Master Clear pin enabled
#FUSES NOPROTECT                //Code not protected from reading
#FUSES NOCPD                    //No EE protection
#FUSES NOBROWNOUT               //No brownout reset
#FUSES NOCLKOUT             
#FUSES IESO                     //Internal External Switch Over mode enabled
#FUSES FCMEN                    //Fail-safe clock monitor enabled
#FUSES NOWRT                    //Program memory not write protected
#FUSES PLL                   
#FUSES STVREN                   //Stack full/underflow will cause reset
#FUSES BORV19               
#FUSES DEBUG                    //Debug mode for use with ICD
#FUSES NOLVP                    //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#use delay(clock=8000000)


Thank you in advance!
Ttelmah



Joined: 11 Mar 2010
Posts: 19546

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PostPosted: Thu Dec 08, 2011 3:33 pm     Reply with quote
As posted, can't run.
If you enable an interrupt (and global), you _must_ have a handler present, otherwise the code will hang.
You show a handler for CCP4, but not for the other two enabled interrupts....

Best Wishes
acm45



Joined: 29 Dec 2008
Posts: 18
Location: Italy

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PostPosted: Fri Dec 09, 2011 1:47 am     Reply with quote
Hi Ttelmah,

Thank you for your fast answer!
I posted the last code I wrote, if I disable all interrupts I obtain the same behaviour, the timer1 never increases!

I saw all the configuration registers for the capture/compare module and seems all ok but isn't working!
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