STM32 and 44k of data org doesn't work!

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deearhunter

Joined: 28 Apr 2016
Posts: 2
Location: Sweden

deearhunter 28 Apr 2016, 10:31

How do I circumvent the very bad way the org directive works in fasm(arm)? (For mee!)
I'm trying to put variables in flash but they just get appended at the end of the code not where they should be.
Any suggestions for a workaround?

Code:

 org 08004000h                  ; Start of Voice-list max 32k each voice 4k
  V_TAB:
  V_SINE:
  include 'sine-list.inc'
  V_TRIA:
  include 'triangle-list.inc'
  V_SQUARE:
  include 'square-list.inc'
  V_SAW:
  include 'sawtooth-list.inc'
  V_BURST:
  include 'burst-list.inc'
  V_GLOTT:
  include 'glottal-list.inc'
  V_NOISE:
  include 'noise-list.inc'
  V_PULSE:
  include 'pulse-list.inc'
 org 0800C000h                  ; Start of M-list 12k
  M_TAB:
  include 'M-list.inc'
 ;

Not anything with relative adressing as I'd prefer to burn the tables only once.
I'm working with a 2.2 $ "bluepill" as a dual VCO with quad. outputs.

28 Apr 2016, 10:31

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 28 Apr 2016, 11:20

Don't use org. It is not designed for your purpose. You can use "db":

Code:

org <somewhere>
;... <somewhere> data goes here
db (<newPlace> - $) dup 0xff ;create some padding
;<newPlace> data goes here

28 Apr 2016, 11:20

deearhunter

Joined: 28 Apr 2016
Posts: 2
Location: Sweden

deearhunter 28 Apr 2016, 13:42

Thanks!
The $ sign means current location?
So I have to pad from about 3k (my program end) until the first 16k boundary if I want to have my tables start at that location.

I'll make an "empty program" that starts at the 16k boundary and burn it first hoping that the programmer doesn't erase that part of the chip.

I was hoping for some assembler directives like segment .table at 0x0....

It's kind of vexing, techniques that I've used for ages (since 78 ) doesn't work when migrating to a new platform.

28 Apr 2016, 13:42

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 28 Apr 2016, 15:34

deearhunter wrote:

The $ sign means current location?

Yes.

28 Apr 2016, 15:34

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