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Futterama
Joined: 17 Oct 2005
Posts: 98
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| Interrupt on pin change with PIC16F684 |
 Posted: Wed Jun 28, 2006 2:57 am |
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Hello forum,
I know this question has been asked many times, and I have read many post about it, but I can't make it work.
I have a simple test app:
I'm trying to light a LED when a pin goes high. I'm using PIN_A4 for the interrupt input pin, with a pull-down resistor of 22k. Then I have connected a LED to PIN_C2 and another LED to PIN_C3.
The LED on PIN_C3 (and the code in the main while loop) is only for me to make sure the PIC is running.
| Code: | .h file:
#include <16F684.h>
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES
#use delay(clock=8000000)
.c file:
#include "684-test-pin-int.h"
#int_RA
RA_isr()
{
int8 i;
output_high(PIN_C2); // Set PIN_C2 high
i = input(PIN_A4); // Make sure to read the interrupt pin
}
void main()
{
setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC);
setup_vref(FALSE);
enable_interrupts(INT_RA4);
enable_interrupts(GLOBAL);
setup_oscillator(OSC_8MHZ);
set_tris_a(0b00010000); // Make PIN_A4 an input
output_low(PIN_C2); // Make sure pin is low
while(1)
{
// Blink LED on PIN_C3 to see the PIC is running
output_high(PIN_C3);
delay_ms(500);
output_low(PIN_C3);
delay_ms(500);
}
}
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I connect PIN_A4 to Vdd to pull it high to activate the interrupt. But nothing happens.
Any suggestions?
I have been looking at the function ext_int_edge() to see if I could make the PIC interrupt on either a rising edge or a falling edge, but since I can't make it interrupt at all, I'm waiting a bit with this. Any comments on ext_int_edge() is also welcome.
Edit: I forgot to mention that I use version 3.249 of the CCS compiler. |
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Futterama
Joined: 17 Oct 2005
Posts: 98
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| Posted: Wed Jun 28, 2006 3:45 am |
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I found the solution... MY GOD!
All the fuses my old version of CCS made for me, is now gone. So, I was missing the INTRC_IO fuse because I made a new project with my new version of CCS, and the field "Fuses" ind the "General" tab is empty. So I suppose I had PIN_A4 configured as CLKOUT or something.
But where did the fuses go?
And where is the explanation of each fuse? |
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