Timer interrupt problem

[mcisabel]

Hi, I`ve got a problem. I want to set the timer0 to interrupt every 833us to send a bit, but when I use the instruction set_timer0(61371) to make the timer0 interrupt every 833us it seem that the timer is not interrupting every 833us because the data that I recived (I`m sending data via serial to PC) is not the data that I should recive, I don`t understand why.

#int_rtcc
rtcc_isr()
{
set_timer0(61371);
clear_interrupt(int_rtcc);
if(numeroentradas<=9)
{
espera=1;
numeroentradas++;
}

}

void main()
{
setup_timer_0(RTCC_INTERNAL);
set_rtcc(61371);
enable_interrupts(INT_RB);
enable_interrupts(GLOBAL);
while(TRUE)
{
output_bit(TX1,0);
while(espera==0);
espera=0;
output_bit(TX1,0);
while(espera==0);
espera=0;
output_bit(TX1,1);
while(espera==0);
espera=0;
output_bit(TX1,0);
while(espera==0);
espera=0;
output_bit(TX1,0);
while(espera==0);
espera=0;
output_bit(TX1,0);
while(espera==0);
espera=0;
output_bit(TX1,0);
while(espera==0);
espera=0;
output_bit(TX1,0);
while(espera==0);
espera=0;
output_bit(TX1,1);
while(espera==0);
espera=0;
output_bit(TX1,1);
while(espera==0);
espera=0;
numeroentradas=0;
}
}

[ckielstra]

You didn't enable the Timer0 interrupt.

[mcisabel]

Hi, thanks for the answer but I try whit the timer0 interrupt enable and nothing, and yes I know about the rs232 features but I already using that for other serial port. I just like to know why the timer doesn`t do what I want.

[ckielstra]

[Mark]

Is this a PIC18 or PIC16?

The CCP module might be better for what you want to do.

Also if you use a timer int and are setting the timer to a value, remember to account for the overhead of the interrupt in your timing.