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rpm counter

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ALIJAMSHED131

Joined: 22 Nov 2013
Posts: 1

rpm counter

Posted: Fri Nov 22, 2013 10:23 am

Code:

#include <16F877.h>

#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#include <ce_lcd.c>

unsigned long int a=0,b=0,d=0;

#int_ext //////////////////error is here in this function
void ir (void) {

b++;
output_toggle(pin_d0);

} ///////////////////////////error ends here

#int_timer0
void rpm (void) {

a++;
set_timer0(5);
}

void main (void)
{
enable_interrupts (global | int_timer0 | int_ext);
ext_int_edge (l_to_h);
setup_timer_0 (RTCC_DIV_256);
set_timer0 (5);

lcd_init ();

while(true) {

if (a == 78) {

d=(b*60);

a=0;
b=0;
}

printf (lcd_putc,"\fRPM = %ld", d);
}

}

In this code the INT of pic 16f877 is being used to detect rising edge. But the problem is that after detecting first rising edge, the INT pin remains high. I think that interrupt flag needs to be cleared, but in C language how could this be done ?

ckielstra

Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

Posted: Fri Nov 22, 2013 12:28 pm

Code:

enable_interrupts (global | int_timer0 | int_ext);

First this line. See the manual.

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