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raflab
Joined: 09 Aug 2011
Posts: 6
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| int_ext + int_timer1 problem !! |
 Posted: Fri Aug 12, 2011 6:52 am |
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my program set to 1 the PIN A1 for 5 seconds and set to 0 for the same delay !! now I'm trying to use the external interrupt using a switch related to PIN B0 !! but it doesn't work !! the timer1 still working although I disabled the timer1 interruption in external interruption's code !!
| Code: |
#include <16F628A.h>
#FUSES NOWDT //No Watch Dog Timer
#FUSES LP //Low power osc < 200 khz
#FUSES NOPUT //No Power Up Timer
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOMCLR //Master Clear pin used for I/O
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD //No EE protection
#use delay(clock=4000000)
#use rs232(baud=9600,parity=N,xmit=PIN_A3,rcv=PIN_A2,bits=8)
#define so 10 // définir les adresse mémoir EEPROM qu'on va les utiliser
#define mo 15
#define sf 20
#define mf 25
unsigned int16 count=0;
#int_ext
void ext_isr()
{
disable_interrupts(int_timer1);
count=0;
output_high(pin_a2);
output_low(pin_a1);
enable_interrupts(int_timer1);
}
#int_timer1
void timer1(){
count++;
}
int16 delay=0;
void main()
{
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
//Setup_Oscillator parameter not selected from Intr Oscillotar Config tab
set_timer1(delay);
EXT_INT_EDGE(H_TO_L);
setup_timer_1(T1_INTERNAL|T1_DIV_BY_8);
enable_interrupts(INT_EXT);
enable_interrupts(INT_TIMER1);
enable_interrupts(GLOBAL);
while(1){
while(count<=10){
output_high(pin_a1);}
count=0;
while(count<=10){
output_low(pin_a1);}
count=0;
}
}
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Ttelmah
Joined: 11 Mar 2010
Posts: 19538
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| Posted: Fri Aug 12, 2011 8:10 am |
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You do realise that as shown, the timer will be disabled for only about 30uSec.
The EXT interrupt only triggers when there is an _edge_ on the external pin. Not a level. Just for 30uSec or so, while the int_ext is serviced (for the whole time, nothing to do with your disable instructions - the _hardware_ disables all other interrupts when one is being serviced), the timer will be disabled, and then re-enabled when the routine exits. Since the timer triggers about every 1000uSec, this will make no difference at all to the operation of the timer.
Best Wishes |
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