Hi,
I'm implementing a bootloader that will allow the actual application
code to be updated on the field via USB.
As the bootloader code resides in 0x0000 .. 0x0800 I need to relocate
the actual application to address 0x0800 along with the interrupt
vectors.
I'm targeting PIC18F4550
I set my .lkr as follows:
CODEPAGE NAME=vectors START=0x0800 END=0x829
PROTECTED
CODEPAGE NAME=page START=0x082A END=0x7FFF
CODEPAGE NAME=idlocs START=0x200000 END=0x200007
PROTECTED
CODEPAGE NAME=config START=0x300000 END=0x30000D
PROTECTED
CODEPAGE NAME=devid START=0x3FFFFE END=0x3FFFFF
PROTECTED
CODEPAGE NAME=eedata START=0xF00000 END=0xF000FF
PROTECTED
ACCESSBANK NAME=accessram START=0x0 END=0x5F
DATABANK NAME=gpr0 START=0x60 END=0xFF
DATABANK NAME=gpr1 START=0x100 END=0x1FF
DATABANK NAME=gpr2 START=0x200 END=0x2FF
DATABANK NAME=gpr3 START=0x300 END=0x3FF
DATABANK NAME=usb4 START=0x400 END=0x4FF
PROTECTED
DATABANK NAME=usb5 START=0x500 END=0x5FF
PROTECTED
DATABANK NAME=usb6 START=0x600 END=0x6FF
PROTECTED
DATABANK NAME=usb7 START=0x700 END=0x7FF
PROTECTED
ACCESSBANK NAME=accesssfr START=0xF60 END=0xFFF
PROTECTED
SECTION NAME=usbram5 RAM=usb5
this seems to relocate most of the code but still some stuff is placed
at 0x0000, as evidenced by the .map file
Map File - Created 12-20-2014 20:46:26
Section Info
Section Type Address Location Size(Bytes)
--------- --------- --------- --------- ---------
S_crt0i___entry code 00000000 program 0x000004
x code 0x000008 program 0x000004
S_main_ivec_0x2_low_priority_interrupt_service code 0x000018
program 0x000004
S_main__low_priority_interrupt_service code 0x00082a program
0x0007aa
and examinging the hex file confirms above:
:020000040000FA
:04000000B2EF13F058
:0400080082EF0EF085
:0400180015EF04F0EC
My high speed is in asm, so obviously that goes to
wrong address:
ivec_0x1_high_priority_interrupt_service: code 0X000008
GOTO _high_priority_interrupt_service
but how can I define this so that it
is not absolute but relative to vectors section.
Also my low priority interrupt vectors in main.c look like:
void low_priority_interrupt_service() __interrupt(2) {
and my main is plain:
void main(void) {
so why does this not get relocated in the correct
section?
Any ideas of how to best fix this? I probably can
hack this to work but there must better and worse
ways to do this...
br Kusti
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