12F683 and DT Instant Interrupts

[jderson]

Thank you for the reply. Unfortunately, I have all three lines commented out and now I get "Unable to fit wsave" .

[Darrel Taylor]

From that error, it looks like you're still compiling for the 12F635.

If using MicroCode Studio, make sure the device dropdown box says 12F683.

For the 683, you'll need both wsave and wsave1.

Or you can use the alternate wsave location $70, and comment the other 3.
<br>

[jderson]

Thank you Darrel. Yes , the drop-down was incorrect. The program doesn't work, but that's because it's still Halloween!

[mr.sneezy]

I'm trying to get my head across the DT Interrupt code for a small new RC modeling project and I'm trying a test example first (the blinky LED) , compiling with MCS. I have 12f683 selected in MCS and MPASM being used.

but I get an odd warning message from MCS thus :
Warning[219] d:\pbp code\pbp\pbppic14.lib 336 : Invalid RAM location specified
Warning[219] d:\pbp code\pbp\pbppic14.lib 892 : Invalid RAM location specified

Anybody know why and if I should just disregard it ?

I commented out the wsave lines as required (which led me here BTW)

My code

LED1   VAR  PORTB.1

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

ASM
RBIF = GPIF
RBIE = GPIE

INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler   TMR1_INT,  _ToggleLED1,   PBP,  yes
    endm
    INT_CREATE               ; Creates the interrupt processor
ENDASM

T1CON = $31                ; Prescaler = 8, TMR1ON
@ INT_ENABLE  TMR1_INT     ; enable Timer 1 interrupts

Main:
  PAUSE 1
GOTO Main

'---[TMR1 - interrupt handler]--------------------------------------------------
ToggleLED1:
     TOGGLE LED1
@ INT_RETURN

My project is quite simple. A 22.5mS interrupt timer (TMR1 I guess) and toggle a few pins then wait for the next interrupt.
Martin

[Darrel Taylor]

Try ...

;LED1 VAR PORTB.1

LED1 VAR GPIO.1
<br>

[mr.sneezy]

Try ...

;LED1 VAR PORTB.1

LED1 VAR GPIO.1
<br>

Yeah.... I forgot about port pins on the smaller PIC's (again).
Ta, Martin

[mr.sneezy]

Now my code compiles fine thankyou, barring a overwriting previous address warning from my config settings (I understand why that is). But I have a small question regarding reloading the timer for anyone.

Must I stop the timer while reloading it with a hex value of A823 in the interrupt handler code (which is all it needs to do) ?

T1CON = %0
TMR1H = $A8
TMR1L = $23
T1CON = %1

Or can I ignore the stop-start safely. Given I can tweak the timer value by trial and error to get my 22.5mS @ 4Mhz ?

The only examples I've dug out on the forum are using ASM code and I'm not strong on interpreting it.