Instant Interrupts - Revisited

[Nupass]

Hi,
I want to start my home project to control ventilation fan by time period ON and time period OFF and to use LCD out for interface.
I have just started to write a code in Micro Code studio Plus v.3.0.0.5 with compiler PICBasic PRO v2.50C.

I made a starting (main) interrupt code as a basis for rest algorithm later. It is based on some desired info I have looked on the internet pages. Seems to be workable and started to compile this code. When compiling I have got some results like assembler errors as following:
Error xxx.asm 125[225] undefined symbol 'halfsec'
Error xxx.asm 126[225] undefined symbol 'halfsec'
Error xxx.asm 128[225] undefined symbol 'halfsec'
Error xxx.asm 129[225] undefined symbol 'unsec'
Error xxx.asm 137[225] undefined symbol 'interr'

As for me I can not understand those results at this stage and have no idea what was wrongin my code. Would you be so kind to look at my sourse code and help me to fix this problem in order to continue my project. Thank you inadvance and any ideas are appresiated.

Here is the code example for my project:

@ DEVICE pic16F628A, XT_OSC
@ DEVICE pic16F628A, WDT_ON
@ DEVICE pic16F628A, PWRT_ON
@ DEVICE pic16F628A, MCLR_OFF
@ DEVICE pic16F628A, BOD_ON
@ DEVICE pic16F628A, LVP_OFF
@ DEVICE pic16F628A, CPD_OFF
@ DEVICE pic16F628A, PROTECT_OFF

DEFINE OSC 4
define INTHAND Myint ' Define interrupt handler

counter var word 'to operate with unsec variable in main program

wsave var byte $20 system
ssave var byte bank0 system
psave var byte bank0 system

halfsec var byte
unsec var word
interr var byte

halfsec = 0 'clear the time variables
unsec = 0
interr = 0

INTCON = %11000000 'enable GIE and PEIE
T1CON = %00110101 'Configure TMR1 with clock/4 and prescaler 1/8
PIE1.0 = 1 'enable interrupt TMR1 overflow

goto Main ' Skip around interrupt handler

ASM ; Assembly language interrupt handler
; Save W, STATUS and PCLATH registers
Myint MOVWF wsave
SWAPF STATUS,W
CLRF STATUS
MOVWF ssave
MOVF PCLATH,W
MOVWF psave
; Interrupt code
MOVLW 221
MOVWF TMR1L
MOVLW 11
MOVWF TMR1H
BCF PIR1,0
INC halfsec
BTFSS halfsec,1
GOTO xxx
CLRF halfsec
INC unsec
; Restore PCLATH, STATUS and W registers
xxx MOVF psave,W
MOVWF PCLATH
SWAPF ssave,W
MOVWF STATUS
SWAPF wsave,F
SWAPF wsave,W
BSF interr,0 ;just a flag...
RETFIE
ENDASM

Main: 'Start of the main program

counter = unsec ' Or do something else...

goto Main ' Return to the main program
end ' End

[mackrackit]

Hi nupass,
welcome to the forum.

First, you really should start a new thread for this as it does not seem to have much to do with this one.

[mark_s]

Nupass,

Try putting under scores in front of your variable within the asm routine

halfsec var byte
unsec var word
interr var byte

Asm

_halfsec
_unsec
_interr

endasm

It's in the manual

[Nupass]

Dear Mark_S,
Thank you for your welcome, I'am appresiated.
So, I was followed by your suggestion, and put underscore at the beginning of my variables...

... then ... success!!!

It is easier than to make a koffee, just you need some skills... Assembler for me it's a horroble thing...

Well, you have been very helpfull and I have learned some...
Thank you a lot ones again.

To be conitue...