aruna1
Joined: 14 Oct 2008
Posts: 103
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| 12F675 need help with configuring comparator and int vref |
 Posted: Sun Aug 09, 2009 1:39 am |
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hello,
I want to use comparator interrupt.
Currently PIC's pin are used as outputs. I just want to know:
1) Using pin 6 will affect vref? (if I use internal vref).
2) I'm hoping to use pin 7 as both input and output. I need to use pin 7 as comparator input while not using as output. While using as a output I disable comparator interrupt? Is this possible?
I already tried some but comparator works only if I ground pin 6 and pull down pin 7.
I have no idea how to setup comparator and internal vref. I read help file but I still don't understand what is different between vref_high and vref_low, and how to choose this option.
I'm new to ccs c, my compiler version is 4.084.
Here is my code:
| Code: |
#include "C:\Documents and Settings\Aruna\My Documents\fan project\adding timer\main.h"
#PRIORITY COMP,EXT
//A4-buzzer
//A5-count/reset
//A3-IR
//A2-zero cross
//A1-LED
//A0-optoisolator
int speed=0;
int count=0;
int timer0_on=0;
int timer_mode=0;
int16 timer0_count=0;
int timer_set=0;
int time_min=0;
int timer_det_mode = 0;
int timer_set_mode = 0;
int second=0;
int minute=0;
int quater_mili=0;
int first_INT_done=0;
int zero_cross_count=0;
int temp=0;
int A4_int_mode=1;
void set_timer();
void finalize_timer();
void chk_ir();
void beep(INT times,int length);
void led(char mode,INT times,int length);
void read_temp();
void fire(int delay);
//#INT_RA
/*void int_on_change_A4 (void)
{
if(A4_int_mode==1)
{
led('r',2,50);
}
} */
#int_COMP
void COMP_isr(void)
{
beep(2,50);
delay_ms(500);
//led('r',3,100);
}
#INT_EXT
void EXT_isr(VOID)
{
chk_ir ();
output_low (PIN_A0);
zero_cross_count++;
IF (speed == 0)
{
output_low (PIN_A0);
}
else IF (speed == 1)
{
IF (zero_cross_count == 5)
{
delay_ms (1);
output_high (PIN_A0);
zero_cross_count = 0;
delay_ms (1);
output_low (PIN_A0);
}
}
else IF (speed == 2)
{
fire(6);
//delay_ms (6);
//output_high (PIN_A0);
}
else IF (speed == 3)
{
fire(4);
//delay_ms (4);
//output_high (PIN_A0);
}
else IF (speed == 4)
{
fire(2);
//delay_ms (2);
//output_high (PIN_A0);
}
else IF (speed == 5)
{
{
read_temp();
if(temp>=60 && temp<=62)//for testing
{
led('r',1,10);
}
delay_ms (1);
output_high (PIN_A0);
zero_cross_count = 0;
delay_ms (1);
output_low (PIN_A0);
}
}
}
#INT_TIMER1
void TIMER1_isr(VOID)
{
quater_mili++;
led ('r', 0, 0) ;
IF (quater_mili == 4)
{
quater_mili = 0;
second++;
IF (second == 60)
{
second = 0;
minute++;
/*IF (minute == 1)//for testing
{
disable_interrupts (INT_EXT);
output_low (PIN_A0);
beep (1, 1000) ;
led ('o', 0, 0) ;
reset_cpu();
minute = 0;
time_min = 0;
disable_interrupts (INT_TIMER1);
}*/
IF (minute == time_min)//real thing
{
output_low (PIN_A0);
beep (1, 1000) ;
led ('o', 0, 0) ;
reset_cpu();
minute = 0;
time_min = 0;
disable_interrupts (INT_TIMER1);
}
}
}
}
#INT_TIMER0
void TIMER0_isr(VOID)
{
IF (timer_det_mode == 1)
{
IF (timer0_count < 5000)
{
timer0_count++;
}
else IF (timer0_count >= 5000)
{
//timer mode on
timer_mode = 1;
disable_interrupts (INT_TIMER0);
timer0_count = 0;
first_INT_done = 1;
}
}
IF (timer_set_mode == 1)
{
IF (timer0_count < 3000)
{
timer0_count++;
}
else IF (timer0_count >= 3000)
{
disable_interrupts (INT_TIMER0);
timer0_count = 0;
finalize_timer ();
}
}
}
void count_up()
{
output_low (PIN_A5);
delay_ms (1);
output_FLOAT (PIN_A5);
}
void reset()
{
output_high (PIN_A5);
delay_ms (1);
output_FLOAT (PIN_A5);
}
void beep(INT8 times,int length)
{
int i = 0;
//disable_interrupts(INT_RA4); // today
FOR (i = 1; i <= times; i++)
{
output_high (PIN_A4);
delay_ms (length);
//output_low (PIN_A5);
output_float(PIN_A4);
IF (i != times)
{
delay_ms (length);
}
}
// enable_interrupts(INT_RA4);// today
}
void led(char mode,INT times,int length)
{
IF (length == 0)//default
{
length = 50;
}
IF (mode == 'o') //turn off
{
output_FLOAT (PIN_A1);
}
else IF (mode == 'r') //red
{
INT i = 0;
output_FLOAT (PIN_A1);
IF (times == 0)
{
output_high (PIN_A1);
}
ELSE
{
FOR (i = 1; i <= times; i++)
{
output_high (PIN_A1);
delay_ms (length);
output_FLOAT (PIN_A1);
delay_ms (length);
}
}
}
else IF (mode == 'g') //green
{
INT i = 0;
output_FLOAT (PIN_A1);
IF (times == 0)
{
output_low (PIN_A1);
}
ELSE
{
FOR (i = 1; i <= times; i++)
{
output_low (PIN_A1);
delay_ms (length);
output_FLOAT (PIN_A1);
delay_ms (length);
}
}
}
}
void finalize_timer() // this code does not run
{
led ('r', 0, 0) ;
beep (3, 50) ;
reset () ;
speed = 0;
timer_mode = 0;
timer_set = 1;
timer_set_mode = 0;
enable_interrupts (INT_TIMER1);
enable_interrupts (INT_EXT);
}
void set_timer() // this code runs
{
disable_interrupts (INT_EXT);
timer_det_mode = 0;
beep (2, 50) ;
reset();
led ('r', 2, 50) ;
led ('g', 0, 0) ;
timer0_count = 0;
timer_set_mode = 1;
//x = 1;
enable_interrupts (INT_TIMER0); // eneabling for second time
time_min = 0;
WHILE ( ! timer_set)
{
IF (! input (PIN_A3) &&time_min <= 270) //time_min should be < 270----- need to add
{
delay_ms (1000);
beep (1, 100) ;
led ('r', 0, 0) ;
delay_ms (50);
led ('g', 0, 0) ;
timer0_count = 0;
time_min = time_min + 30;
count_up ();
}
}
}
VOID chk_ir ()
{
IF ( ! input (PIN_A3))
{
count++;
delay_ms (500);
beep (1, 50) ;
IF (speed == 0)
{
}
IF (speed != 5 &&count <= 5)
{
count_up ();
speed++;
}
else IF (count == 6)
{
speed = 0;
timer_det_mode = 1;
enable_interrupts (INT_TIMER0); //eneabling for first time;
count_up();
timer0_on = 1;
led ('g', 0, 0); //green
}
else IF (count >= 7)
{
count = 0;
IF (timer_mode == 0)
{
led ('o', 0, 0) ;
disable_interrupts (INT_TIMER0);
first_INT_done = 0;
reset ();
speed = 0;
}
}
delay_ms (500);
}
}
void read_temp()
{
//disable_interrupts(INT_RA4);// today
output_float(PIN_A4);
setup_adc_ports (sAN3|VSS_VDD);
setup_adc (ADC_CLOCK_INTERNAL);
set_adc_channel(3);
delay_us(10);
temp=read_adc();
delay_us(10);
setup_adc_ports (NO_ANALOGS|VSS_VDD);
setup_adc (ADC_OFF);
// enable_interrupts(INT_RA4);// today
}
void fire(int delay)
{
disable_interrupts(INT_COMP);
delay_ms(delay);
output_high(PIN_A0);
delay_ms(1);
output_float(PIN_A0);
enable_interrupts(INT_COMP);
}
void main()
{
setup_adc_ports (NO_ANALOGS|VSS_VDD);
setup_adc (ADC_OFF);
setup_timer_0 (RTCC_INTERNAL|RTCC_DIV_4);
setup_timer_1 (T1_INTERNAL|T1_DIV_BY_4);
//setup_comparator (NC_NC);
//setup_vref (FALSE);
setup_comparator(A1_VR);//today
setup_vref(VREF_HIGH|9);//today
enable_interrupts(INT_COMP);//today
output_FLOAT (PIN_A4);
output_FLOAT (PIN_A1);
output_FLOAT (PIN_A5);
reset ();
delay_ms (1000);
enable_interrupts (INT_EXT);
//enable_interrupts(INT_RA4);// today
disable_interrupts (INT_TIMER1);
disable_interrupts (INT_TIMER0);
enable_interrupts (GLOBAL);
// TODO: USER CODE!!
WHILE (1)
{
chk_ir ();
if (first_INT_done == 1)
{
first_INT_done = 0;
set_timer ();
}
}
}
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