DT instant interrupts with mister_e keypad

[Tomexx]

DT instant interrupts with mister_e keypad (16F628A)

I'm new to interrupts and tried DT instant interrupts by Darrel Taylor (thanks Darrel). The blinky works great with the INT_INT.

I want for my program to sleep until woken up by the keypad then go to keypad rutine and flash led as many times as the number pressed.

So I connected keypad's columns to PortB and tried to invoke RBC_INT. Spent few hours double checking everything. No luck.

I had the RBC_INT working with a switch on PortB.6 before and that part worked. Sometimes it will work after I cycle the power but on the first press only (press 5, flashes 5 times), after that it won't till I shut power off again. Sometimes it won't flash the led at all. So when it works, the keypad works as well

Schematic attached.

CMCON  = 7                          ' Set portA to i/o
DEFINE   OSC  20

TRISA = %00000
TRISB = %01110000

INCLUDE "DT_INTS-14.bas"            ; Base Interrupt System
INCLUDE "ReEnterPBP.bas"            ; Include if using PBP interrupts
include "modedefs.bas"
include "keypad.bas"

'=======================================================
' SCAN_ONCE is set to 1 as well as proper keypad settings inside the keypad.bas
'=======================================================

LED_Grn     var  PortA.1            
ctr         var byte

ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler    RBC_INT,  _Scan,   PBP,  yes
    endm
    INT_CREATE               ; Creates the interrupt processor
ENDASM

@   INT_ENABLE   RBC_INT     ; enable external (INT) interrupts

Main:
@ sleep
goto Main

'---[INT - interrupt handler]---------------------------------------------------
Scan:
  gosub KeypadScan

  for ctr = 1 to key
    high led_grn
    pause 200
    low led_grn
    pause 200
  next ctr
@ INT_RETURN

end

As always any help appreciated,
Tom