DEFINE RESET_ORG and DT Instant Interrupt

[Marcick]

Hi all,
anybody can understand why the below code works only commenting the first line ?
If I use DEFINE RESET_ORG the program hangs and does nothing.

'    DEFINE RESET_ORG 3000h

    include "declare.inc"
    INCLUDE "DT_INTS-18.bas"       ; Base Interrupt System
    INCLUDE "ReEnterPBP-18.bas"    ; Include if using PBP interrupts

ASM              
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler   TMR1_INT,  _Timer1_250mS_INT,   PBP,  yes
    endm
    INT_CREATE               ; Creates the interrupt processor
ENDASM
    @    INT_ENABLE  TMR1_INT         ; enable Timer1 interrupts

    OSCCON        =%100000            ; Primary oscillator, internal 8MHz
    OSCCON2.0    =1
    OSCTUNE.7    =1
    T1CON        =%110111            ; Timer1, 1:8 prescaler, 262mS Interrupt

    INTCON.7=1                        ; global int
    INTCON.6=1                        ; peripheral int

MyLoop:
    Hserout2["Hello ... ",#x,13,10]
    x=x+1
    pause 500
    goto MyLoop
    
Timer1_250mS_INT:
    toggle led 
    @ INT_RETURN

[pedja089]

Because, you need to reroute reset interrupt vectors.
PIC always jump to 04 and 08 on hi/lo int.
And you don't have anything there.
Generally that is bad idea, because you hijack interrupts from main code.
And that reroute you cant do in PBP, nor ASM at compile time. So you need to do it manually. Then you can reroute int vectors in main program, to some other location.
And all that is just bad.

What exactly you are trying to do. I know you are building bootloader, I have posted few on this forum.
It should be very easy, straight forward code... Not sure why you need interrupts.

[Marcick]

Hi Pedja,
this is a sample program that runs ok without the DEFINE RESET_ORG.
What I'm trying to do is move it from org 0 to create place for my bootloader.
My real program needs interrupt.

I think I have read that interrupt vector are moved automatically when you use DEFINE RESET_ORG, you say not ?
Can you drive me how to remap int vector ?

[Marcick]

I describe my idea.

1) Write a bootloader program at ORG 0 that get an HEX file and write memory starting at 3000h
2) export code, manipulate to obtain something like below and put it in a file "bootloader.inc"

ASM
	dw 0x0EF5B, 0x0F002, 0x0FFFF, 0x0FFFF, 0x0EFAA, 0x0F003, 0x0FFFF, 0x0FFFF, 0x0FFFF, 0x0FFFF, 0x0FFFF, 0x0FFFF
	dw 0x0E00B, 0x00606, 0x0C004, 0x0FFE9, 0x0C005, 0x0FFEA, 0x050EE, 0x0CFE9, 0x0F004, 0x0CFEA, 0x0F005, 
	dw 0x00004, 0x0A89E, 0x0D7FD, 0x06EAD, 0x080D8, 0x0EF58, 0x0F002, 0x050E9, 0x0010F, 0x00004, 0x0A8A4, 
ENDASM

3) Take my main program and add DEFINE RESET_ORG 3000h
4) at the end of the program add

@ ORG 0h
BootLoader:
	include "BootLoader.inc"

Then I can call the bootloader with a GOTO @0.

Of course it doesn't work .....

[Marcick]

If in the main program (with DEFINE RESET_ORG 3000h) I add this

@ ORG 0
	@ GOTO 3000h
@ ORG 8
	@ GOTO 3008h
@ ORG 4
	@ GOTO 3004h

It works....
But when I want to jump to bootloader I need the vector remapped to 4 and 8....

Maybe I can use WRITECODE to overwrite the INT vector before jumping to bootloader and then again WRITECODE before exit from bootloader ?

[pedja089]

Now I got it.
I have done bootloaders on top of main program. At address 64000. So in main program i call bootloader with @ GOTO 64000. No need to remap anything.


When you use reset org 3000h, PBP expect int vectors on 3008h, but CPU will jump at 08h.

So in your bootloader you need to have

@ ORG 8
	@ GOTO 3008h
@ ORG 4
	@ GOTO 3004h

Then CPU will jump to 08h, then jump to 3008h, then jump to ISR. Lot of jumping...
Also, when you power PIC it will enter to bootloader first, so you need exit from bootloader
eg

 @ GOTO 03000h

But this

@ ORG 8
	@ GOTO 3008h
@ ORG 4
	@ GOTO 3004h

will generate warning in ASM, overwriting prev address, or something like that. Then it depends, what was last, so it may assemble correctly, maybe not.
EDIT:
You could try something like this in bootloader:

Reset org 10h
@ ORG 0
	@ GOTO 10h
@ ORG 8
	@ GOTO 3008h
@ ORG 4
	@ GOTO 3004h