Hi Vasili,
On 01/10/2021 13.11, vsurducan wrote:
Hi Rob and Rob, :)
I've tried with or without ISR, with AND IOCAP reset or normal IOCAP
reset. This IOC is erratic and has a lot of latency. The RDY_IN signal
is 20ms square 50% duty cycle, the RDY_OUT signal has a latency most
of the time...but sometimes has a 20mS pulse as it should.
I'm using IOC for quadrature encoders on the wheels of an RC vehicle for
navigation. With higher speeds the interrupt frequency is significantly
higher then once per 20ms. Nevertheless this seems to work quite well
(but latency is not a real issue).
Below my test with a 12F1572 and modified version of your program on a
little board with LEDs on pins A0, A1 and A2.
The IOC of RDY_IN is handled by an interrupt routine. Both rising and
falling edge interrupts are activated and RDY_OUT (in my setup on
pin_A2) is controlled in the ISR as well. The input signal for RDY_IN
is generated in the forever loop on pin_A1. When connecting pin_A0 with
pin_A1 RDY_OUT is following RDY_IN neatly (visual observation shows all
3 LEDs blinking synchronously).
Hopefully this is of some help to solve your issue.
Regards, Rob.
=================================
alias pin_RDY_IN is pin_A0
alias pin_RDY_IN_direction is pin_A0_direction
pin_RDY_IN_direction = input
OPTION_REG_WPUEN = 0
WPUA_WPUA0 = 0 ; pull-up disabled on RA0
alias pin_RDY_OUT is pin_A2
alias pin_RDY_OUT_direction is pin_A2_direction
pin_RDY_OUT_direction = output
pin_RDY_OUT = low
alias pin_TRIGGER is pin_A1
pin_A1_direction = OUTPUT
pin_TRIGGER = low
-- main program
INTCON_GIE = high
INTCON_IOCIE = high -- enable IOC interrupts
IOCAP_IOCAP0 = high -- enable positive edge interrupts RDY_IN
IOCAN_IOCAN0 = high -- enable negative edge interrupts RDY_IN
procedure IOC() is
pragma interrupt
if INTCON_IOCIF then -- IOC interrupt
if IOCAF_IOCAF0 then -- edge interrupt on RDY_IN
if pin_RDY_IN then -- was a positive edge
pin_RDY_OUT = high
else -- negative edge
pin_RDY_OUT = low
end if
IOCAF = IOCAF & 0xFE -- clear IOCAF0
end if
INTCON_IOCIF = 0 -- reset IOC interrupt flag
end if
end procedure
forever loop
pin_TRIGGER = high
delay_1ms(20)
pin_TRIGGER = low
delay_1ms(20)
end loop
--
*Rob H*amerling, Vianen, NL
--
You received this message because you are subscribed to the Google Groups
"jallib" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to jallib+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/jallib/24f3dc21-9e72-2932-ea0b-ed3a6a0d64e2%40gmail.com.
