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16f887 timer problem

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Tak

Joined: 22 Apr 2012
Posts: 6

16f887 timer problem

Posted: Sun Apr 22, 2012 10:36 pm

Code:

#include "16f887.h"
#device adc=8
#device *=16
#include "ham.h" // contain ADC set up.
#include <stdio.h>
#FUSES HS, NOWDT
#use delay(clock=8000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
volatile int8 a=0;

#int_TIMER1
void TIMER1_isr()
{
set_timer1(20000);
}

void main()
{
set_tris_d(0x00);
set_tris_a(0x00);
output_a(0xff);
cau_hinh_adc(); //set up adc
setup_timer_1(RTCC_INTERNAL|RTCC_DIV_16);
setup_timer_2(T2_DISABLED,0,1);
enable_interrupts(int_TIMER1);
set_timer1(20000);
//enable_interrupts(GLOBAL);

while(1)
{
a=read_adc();
printf(" %u",a);
output_d(a);
delay_ms(500);
}
}

I try to read ADC and send the value to PC's COM port. Everything worked fine. After that, i decide to make sample with Timer1 and it doesn't work any more. I tested again with this:

Code:

#int_TIMER1
void TIMER1_isr()
{
set_timer1(20000);
output_d(a);
}

void main()
{
set_tris_d(0x00);
set_tris_a(0x00);
output_a(0xff);
cau_hinh_adc(); //set up adc
setup_timer_1(RTCC_INTERNAL|RTCC_DIV_16);
setup_timer_2(T2_DISABLED,0,1);
enable_interrupts(int_TIMER1);
set_timer1(20000);
enable_interrupts(GLOBAL); // enable this

while(1)
{
a=read_adc();
printf(" %u",a);
delay_ms(500);
}
}

COM port still get value from ADC but leds haven't run at all. Every code I put in TIMER1_isr() 's not run too Crying or Very sad

. I use CCS 4.104
Thanks for any advices=.=

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Mon Apr 23, 2012 12:51 pm

Quote:

setup_timer_1(RTCC_INTERNAL|RTCC_DIV_16);

Your constants are not correct. The "RTCC" constants are for Timer0.
You need to use the constants for Timer1. Look in the 16F887.h file
to find the correct constants.

Tak

Joined: 22 Apr 2012
Posts: 6

Posted: Mon Apr 23, 2012 10:42 pm

Thanks PCM. It did work. my silly Embarassed

Code:

setup_timer_1(T1_INTERNAL|T1_DIV_BY_8);

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