Interrupt on Change with 16F886

[Ioannis]

Hi. I got a problem with DT-INTS14 on a 16F886 chip.

I can't seem to make it work. It is a simple test code on port b change, to trigger interrupts with DT-INTS14.

#config
Line1 = _DEBUG_OFF & _LVP_OFF & _FCMEN_OFF & _IESO_OFF & _BOR_OFF
Line2 = _CP_OFF & _MCLRE_ON & _PWRTE_ON & _WDT_OFF & _INTRC_OSC_NOCLKOUT
    __CONFIG _CONFIG1, Line1 & Line2
    __CONFIG _CONFIG2, _WRT_HALF & _BOR40V
#endconfig

OSCCON = %01110001 '8MHz Clock

DEFINE OSC 8


DEFINE LCD_DREG PORTC
DEFINE LCD_DBIT 0
DEFINE LCD_RSREG PORTA
DEFINE LCD_RSBIT 3
DEFINE LCD_EREG PORTA
DEFINE LCD_EBIT 1
DEFINE LCD_BITS 4
DEFINE LCD_LINES 2
DEFINE LCD_COMMANDUS 2000
DEFINE LCD_DATAUS 100

OPTION_REG.0=1		'PSA0 PRESCALER SELECT 1:1 TO 1:256
OPTION_REG.1=1		'PSA1
OPTION_REG.2=1		'PSA2
OPTION_REG.3=1		'PRESCALER TO: 1->WDT, 0->TMR0
OPTION_REG.4=0		'T0SE SOURCE EDGE 1->H TO L, 0->L TO H
OPTION_REG.5=0		'T0CS 1->FROM RA4, 0->FROM INT. CLOCK
OPTION_REG.6=0		'INT EDGE SELECT 0->H TO L, 1->L TO H
OPTION_REG.7=0		'PULL UP 1->DISABLE, 0->ENABLE

adcon0=%11000001   
adcon1=%10000000
ansel=$01
anselh=$00

DEFINE ADC_BITS 10          ; Set-up ADC for fast 10-bit results
DEFINE ADC_SAMPLEUS 5

ccp1con=0

PORTA=%00000001
PORTB=%01110000			'RB0-RB3 row outputs to 3x4 keyboard
						'RB4-RB6 col inputs from 3x4 keyboard

PORTC=0'%10000001

TRISC=0'$80:'TRISD=0:TRISE=0

TRISA = %00010001

TRISB = %01110000			'PB0: row 1
						'PB1: row 2
						'PB2: row 3
						'PB3: row 4
						'PB4: column 1
						'PB5: column 2
						'PB6: column 3
						'PB7: No Con.

IOCB = %01110000			'interupt on change enable on RB4-RB6
INTCON = %10001000		'Enable global and Int. on change
RBIF var INTCON.0			'alias to RBIF bit of INTCON
wsave    var byte $70 system
wsave1   var byte $a0 system
wsave2   var byte $120 system
wsave3   var byte $1a0 system

adc_t     var word

temp    var word
i       var byte
a       var byte
pressed var byte


clear

Lcdout $fe,1,"IOC test"

INCLUDE "D:\Dropbox\Projects\PICDEM2\Interrupt\DT_INTS-14.bas"
INCLUDE "D:\Dropbox\Projects\PICDEM2\Interrupt\ReEnterPBP.bas"


'-------------   INTERRUPTS SETUP   ---------------------
ASM
INT_LIST  macro;    IntSource,  Label,      Type,  ResetFlag?
    INT_Handler     RBC_INT,    _IOC2,      PBP,    yes
    endm
    INT_CREATE            ; Creates the interrupt processor
ENDASM

@   INT_ENABLE  RBC_INT      ; Enable Port B on change

'-------------   INTERRUPTS SETUP   ---------------------

portb=$7F
goto main

'***********************************************************************
'*
'*             Interrupt on Change
'*
'***********************************************************************

IOC2:
    pressed=1
    lcdout $fe,$80,"interrupt"
    i=portb
    RBIF=0
@ INT_RETURN


main:

while 1
if pressed then
    lcdout $fe,$c0,#i,"    "
    pressed=0
    portb=$0f
endif
wend

End

It must be something stupid but do not see it...
Thanks,

Ioannis

[richard]

what makes the pins change state ?

[Ioannis]

You are right. I forgot to note that col and rows are connected to a keyboard matrix 3x4.

Ioannis

[richard]

You are right. I forgot to note that col and rows are connected to a keyboard matrix 3x4.

but how is it wired , what will make the columns change state the rows are set to all 1's the initial col port pins are set to all 1's
where can a o come from ?

usually a zero or a one is walked down a row or col

[Ioannis]

Well, I have to work the project on the morning and not late at night...

I missed that portb=0 obviously and just focused on the Interrupt itself and the settings...

Ioannis