Is it ok to use interrupts like this?
no , you may appear to get away with inserting pbp statements in an ASM interrupt but it is a delusion.
pbp statements set many internal variables to enable complex statements to be evaluated , executing foreign statements from an isr will pollute this process. thats why dt-ints exists.
use asm code in asm interrupts like this
Code:
#CONFIG __config _CONFIG1, _FOSC_INTOSC & _WDTE_OFF & _PWRTE_ON & _MCLRE_OFF & _CP_OFF & _CPD_OFF & _BOREN_ON & _CLKOUTEN_OFF & _IESO_ON & _FCMEN_ON
__config _CONFIG2, _WRT_OFF & _PLLEN_ON & _STVREN_ON & _BORV_19 & _LVP_OFF
#ENDCONFIG
DEFINE INTHAND myINT
DEFINE NO_CLRWDT 1
DEFINE OSC 4
OSCCON = %01101010
TRISA = %011000 ; RA4 input for battery measurement, RA3 input on change, rest output
ANSELA = %0000 ; ADC Disable
OPTION_REG = %10000111 ; Disable internal pull-ups, TMR0 On, prescaller to 256
FVRCON = %10011000 ; Internal reference to 2048mV
CM1CON0 = %10100110 ; Comparator output to C1OUT, switch on LED if voltage is below ref. 2,048V
CM1CON1 = %00100001 ; C1IN1- pin is RA4, comparator voltage input, C1IN1+ positive input to FVR set to 2,048V
LATA = %000001 ; init state of pin RA0 and RA1, LEDs connected to these pins
T1CON = %00110001 ; TMR1 On, prescaller 1:8, Fosc/4
INTCON = %11001000 ; Enable GIE, PEIE, IOCIE
PIE1.0 = 1 ; Enable TMR1IE Owerflow interrupt
IOCAN.3 = 1 ; Enable RA3 negative edge OnChange interrupt
; ------------ With TMR1 and interrupt, oscilator 4MHz ---------------
Main:
; pause 10000 ; some stuff here
goto main
; ------------ INT Handler Routine ---------------
asm
myINT
movlw 0
banksel PIR1
btfsc PIR1,0
movlw 3
bcf PIR1,0
banksel IOCAF
btfsc IOCAF,3
iorlw 32
bcf IOCAF,3
banksel LATA
xorwf LATA,f
RETFIE
endasm
Bookmarks