Hi all,
I'm wander if there is a better way for synchronizing an external
interrupt INT0 fired by a 20mS external event with a 5mS asynchronous
event.
I need this precise delay for reading a voltage at 5mS after every
zero crossing voltage.
I'm doing like this inside the ISR:
-- _mili_second counter is incremented in the ISR every 1mS based on
the Bresenham alorithm
if INTCON_INT0IF then ; first int0 external interrupt occured
INTCON_INT0IE = low; disable INT0 external interrupt
_mili_second = 0 ; reset the counter
int0_flag = high ; interrupt has ocurred set a flag
INTCON_INT0IF = low ; clear int0 flag
end if
if (_mili_second == 5) & int0_flag then ; 5ms passed from the
previous int0 interrupt ?
; run adc here!
cda_inv2 = on ; yes see the event on the output pin
elsif (_mili_second >= 6) & int0_flag then ; keep the output on
for another 1 ms
cda_inv2 = off ; ok enough, I saw it
int0_flag = low; clear the interrupt flag
end if
thx,
Vasile
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