darrel taylor's instant interrupt compiler error

[delta_boogie]

hello everyone!!

i got the code of darrel taylor's instant interrupts and eagerly tried his program of toggling an led. but when i tried to compile it inside microcode studio using PIC16F84A as the target processor, i get an assembler error that says like this:

Error[113]c:\progra~1\mecani~1\mcs\instan~1.asm 115:Symbol not previously defined (PIR1)

When i compiled it with PIC16F628A,it was succesful but has no hex file generated. Do i need to comment out some lines in his DT_INTS-14.bas and ReEnterPBP.bas include files?

any suggestions or comments is highly appreciated. Thank you very much!!

[mackrackit]

Are you using MPASM for the assembler?

[Darrel Taylor]

The very first PIC with EEPROM memory was the 16C84.
The 16F84 is simply the flash memory upgrade to a VERY OLD chip.

I wish everyone would Stop using 16F84's!!!!!!
They are worthless, and very expensive.<hr>As for the error ...

You are probably trying to compile the example that uses Timer1 to blink an LED.
But the 16F84A doesn't have a Timer1. Or a PIR1, or a USART, or an A/D module, or a ....

You could try using Timer0.
The "Combine" example has some Timer0 code.
<br>

[delta_boogie]

first of all thank you very much for the immediate reply..

as for mackrackit: yes i am using MPASM as my assembler but why do i still get this same error?

as for darrel taylor thank you for suggesting on not using 'F84s anymore but you see i don't have any available PICs beside the PIC16F84A and i haven't mastered yet PICBasic Pro language yet..

LED1   VAR  PORTB.1

INCLUDE "DT_INTS-14.bas"     ' Base Interrupt System
INCLUDE "ReEnterPBP.bas"     ' Include if using PBP interrupts

ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler    INT_INT,  _ToggleLED1,   PBP,  yes
    endm
    INT_CREATE               ; Creates the interrupt processor

    INT_ENABLE   INT_INT     ; enable external (INT) interrupts
ENDASM

Main:
  PAUSE 1
GOTO Main

'---[INT - interrupt handler]---------------------------------------------------
ToggleLED1:
     TOGGLE LED1
@ INT_RETURN

this is your example that i was trying to compile using microcode studio..
pardon me for the inconvenience..

i think that your code is the best way to service interrupts in picbasic environment which i can very much use for my led dot matrix(5x7) scrolling display..

thank you very much!!

[Darrel Taylor]

Add this line before the INT_LIST.

@PIR1 = EECON1

[delta_boogie]

a big thanks to you sir expert darrel taylor!!!

it's already working!!

thank you very much for the assistance!!

by the way,is EECON1 a register in the PIC?

thanks!!!

[Darrel Taylor]

Hi Al,

You're welcome. And Happy Holiday's to you too.
Whichever Holiday's they may be.

by the way,is EECON1 a register in the PIC?

Yes, EECON1 is a register in the PIC.
On the 16F84, it contains the EEIF bit (EEPROM Write Operation Interrupt Flag bit).
On the other PIC16F's, that bit is located in either the PIR1 or PIR2 registers.

The @PIR1 = EECON1 line tells the compiler to look at the EECON1 register for the EEIF bit, since there isn't a PIR1 or PIR2 in the 16F84.

hth,

[Archangel]

I wish everyone would Stop using 16F84's!!!!!!
They are worthless, and very expensive.

Hi Darrel, The thing is, Since it is so old and simple in terms of having very few enhancements, most of the PIC Basic books for beginners specify them, as the default configs set them up correctly, so the authors do not have to hassel explaining how to set config statements.

[aratti]

Very likely I am missing somthing because I am unable to compile the DT_Ints-14 with 16F84A & 16F873 while 16F876 will compile with some warnings.

Here the simple code:

LED1 VAR PORTB.1
INCLUDE "DT_INTS-14.bas" ; Base Interrupt System
INCLUDE "ReEnterPBP.bas" ; Include if using PBP interrupts

ASM
INT_LIST macro ; IntSource, Label, Type, ResetFlag?
INT_Handler INT_INT, _ToggleLED1, PBP, yes
endm
INT_CREATE ; Creates the interrupt processor
ENDASM
@ INT_ENABLE INT_INT ; enable external (INT) interrupts
Main:
PAUSE 1
GOTO Main
'---[INT - interrupt handler]---------------------------------------------------
ToggleLED1:
TOGGLE LED1
@ INT_RETURN

These are the errors with 16F84A with "@PIR1 = EECON1" or w/o it (Flash 1024)

ERROR: Variable wsave3 position request 416 beyond RAM_END 79.
ERROR: Variable wsave2 position request 288 beyond RAM_END 79.
ERROR: Variable wsave1 position request 160 beyond RAM_END 79.

These are the erros with 16F873 & 16F874 (Flash 4096)

ERROR: Variable wsave3 position request 416 beyond RAM_END 255.
ERROR: Variable wsave2 position request 288 beyond RAM_END 255.

These are the warnings with 16F876 (Flash 8192)

Warning[205]c:\..................................\led_int.asm 495:Found directive in column 1. (endm)
Warning[206]c:\..................................\led_int.asm 496:Found call to macro in column 1. (INT_CREATE)
Warning[206]c:\..................................\led_int.asm 494:Found call to macro in column 1. (INT_Handler)

I did not check if the above compilation was working or not ( the harware I had prepared was for 16F84A)
The only explanation I am giving is the ram space, but since others have used with success the 16F84A with the same program, that means that the problem is with my compiler (ver 2.47) or something wrong I am doing.

Any help will be greatly appreciated.

Al.

[Darrel Taylor]

For the wsave errors. Open the DT_INTS-14.bas file and at the top you'll see a section that says ...

' --- IF any of these three lines cause an error ?? ----------------------------
'       Comment them out to fix the problem ----
' -- It depends on which Chip you are using, as to which variables are needed --
wsave1      var byte    $A0     SYSTEM      ' location for W if in bank1
wsave2      var byte    $120    SYSTEM      ' location for W if in bank2
wsave3      var byte    $1A0    SYSTEM      ' location for W if in bank3
'-------------------------------------------------------------------------------

For the "Found in column 1" warnings.
You must maintain the proper indentation of the ASM blocks, as seen in the original examples.

DT_INTS-14 (Hello World)
http://www.darreltaylor.com/DT_INTS-14/hello.html

[aratti]

Thank you Darel, for the prompt answer. Problem has been fixed.
Now program compile (using @PIR1 = EECON1) correctly, and I can proceed experimenting with interrupts.

Thank you again for your kindness. With the occasion, I whish you:

Merry Christmas and Happy New Year

Al.