Struggling with Timer1 - HELP!!!

[picker]

I am trying to time a 1Hz square wave using TIMER1. The program interrupts on all the interrupts, but I always get a reading of 0 or 1 on the RS232! The way I have it is that the TIMER1 will inc every 1.6uS and that is why I load it with 64535 which is a thousand ticks away from overflow. Then when it overflows I inc a counter which is the lenght of the period in 1.6mS's!. What am I missing?

Here is the code...

#device PIC18F452
#include "C:\Program Files\Picc\ClockCal\ClockCal.h"
long lTemp = 0;
long cnt =0;
long tempcnt=0;
short done=0;
#int_TIMER1
TIMER1_isr() //this will be called every 1000*1.6uS=1.6ms
{
set_timer1(64535); //1000 * 1.6uS
tempcnt++; //count no. of 1.6ms
}

#INT_EXT //L_TO_H
EXT_isr()
{
cnt=tempcnt;
tempcnt=0;
done=true;
}

#INT_EXT1 //H_TO_L
EXT1_isr()
{
tempcnt=0;
}



void main() {

setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL);
setup_timer_1(T1_INTERNAL|T1_DIV_BY_8);
setup_timer_2(T2_DISABLED,0,1);
setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
port_b_pullups(FALSE);
ext_int_edge(0,L_TO_H);
ext_int_edge(1,H_TO_L);
enable_interrupts(INT_TIMER1);
enable_interrupts(INT_EXT);
enable_interrupts(INT_EXT1);
enable_interrupts(global);
set_timer1(64535);


while (true)
{
if (done)
{
printf("%lu \n",tempcnt);
done=false;
//cnt=0;
}
}

}

[Humberto]

[picker]

Thanks...