RE: [Sdcc-user] code fails if it reaches certain size?

[Muller J. <jjm...@su...>]

The endpoint buffers are at 0x7b40-0x8000 and mapped to 0x1b40-1F40. To
be safe, I can start my code at 0x8000, which gives it about 32KB of
space to grow without any hassles. It works, except when the firmware
gets bigger than 19000 bytes, so the problem must lie elsewhere. Any
ideas?

-----Original Message-----
From: sdc...@li...
[mailto:sdc...@li...] On Behalf Of Ernst
Bachmann
Sent: 01 July 2005 03:49 PM
To: sdc...@li...
Subject: Re: [Sdcc-user] code fails if it reaches certain size?

Hi,

On Friday 01 July 2005 15:31, Muller Jaco <jjm...@su...> wrote:

> My firmware code is growing, and is working fine until its size=20
> reaches about 19000 bytes. The code is running on an EZ-USB FX
microcontroller.
> As soon as the size reaches this limit, the device cannot be=20
> enumerated (firmware not working..) Below this limit, the firmware can

> be relocated anyware in external RAM without any problems. I am=20
> avoiding the memory areas of the EZ-USB used for buffer registers.
>
> The firmare size will grow beyond 19000 bytes, as I still need to=20
> implement more functions. I am completely baffled and don't even know=20
> where to start tracing the bug - does anyone have any idea where the=20
> problem could be? As far as I know, there is no code size limit in
SDCC.

My guess would be that your code somewhere overlaps with the endpoint
buffers, making renumeration fail cause the buffers are filled with your
code.

But since those Buffers start at 0x7B40, there should be enough space
below for your code.
The EZUSB Chips also remap those buffers into a second memory area, but
IIRC those would be at arround 0x2... so I guess you deactivated that
already

Maybe check the memory map as generated by the linker for overlap with
some of the usb buffers?

Luckily my project's firmware still fits in an AN2131SC without
additional external ram, so I never looked closely at availabe memory
areas.

Greetings
/Ernst


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