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acm45
Joined: 29 Dec 2008
Posts: 18
Location: Italy
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| 16F1825 Compare Module |
 Posted: Thu Dec 08, 2011 1:10 pm |
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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 
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)
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Thank you in advance! |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19328
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| Posted: Thu Dec 08, 2011 3:33 pm |
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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 |
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acm45
Joined: 29 Dec 2008
Posts: 18
Location: Italy
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| Posted: Fri Dec 09, 2011 1:47 am |
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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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