I think the cause of your problem is that you set INTCON_GIE = high, but
have no ISR (Interrupt Service Routine).
An interrupt (hardware jump to the interrupt vector at address 0x0004)
becomes practically a restart of the program.
Possible solutions: INTCON_GIE = low, or use an ISR to handle the IOC
interrupt (but no delay in an ISR!)
Regards, Rob.
On 30/09/2021 17.51, vsurducan wrote:
According to the PIC12F1572 datasheet, rising edge IOC can be detected
by enabling edge detection on input pins (IOCAPx or IOCANx)
and reading the IOC flag (IOCAFx) or the INTCON_IOCIF, then clearing
the flag for the next IOC detection.
Seems it does not work. Any ideas? Thx.
include 12lf1572 -- target PICmicro
--
-- This program uses the internal oscillator at 4 MHz.
pragma target clock 32_000_000 -- oscillator frequency
--
pragma target OSC INTOSC_NOCLKOUT -- internal oscillator
pragma target PLLEN DISABLED -- PLL off
pragma target CLKOUTEN DISABLED -- no clock output
pragma target WDT DISABLED -- watchdog
pragma target BROWNOUT ENABLED -- brownout reset
pragma target LVP DISABLED -- no low voltage
programming
pragma target MCLR INTERNAL -- internal reset
--
--
OSCCON_SCS = 0 -- select primary oscillator
OSCCON_IRCF = 0b1110 -- 8 MHz
OSCCON_SPLLEN = ENABLED -- 4x PLL: 8 -> 32 MHz
--
enable_digital_io() -- make all pins digital I/O
include delay
alias pin_RDY_IN is pin_A0
alias pin_RDY_IN_direction is pin_A0_direction
pin_RDY_IN_direction = input
alias pin_RDY_OUT is pin_A5
alias pin_RDY_OUT_direction is pin_A5_direction
pin_RDY_OUT_direction = output
pin_RDY_OUT = low
OPTION_REG_WPUEN = 0
WPUA_WPUA0 = 0 ; pull-up disabled on RA0
-- main program
--
----------------------------------------------------------------------------
INTCON_GIE = high ; not necessary without interrupt routine
INTCON_IOCIE = high ; enable interrupt on change, not necessary
without interrupt routine
IOCAP_IOCAP0 = high ; enable positive edge interrupt on change on RDY_IN
forever loop
; if INTCON_IOCIF then
if IOCAF_IOCAF0 then ; a positive edge interrupt on change on
RDY_IN occured
pin_RDY_OUT = high
delay_1mS (20)
pin_RDY_OUT = low
IOCAF_IOCAF0 = low ; clear IOCAF0 flag
; INTCON_IOCIF = low
else ; no interrupt occured
pin_RDY_OUT = low
end if
end loop
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*Rob H*amerling, Vianen, NL
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