Re: [libopenstm32-devel] stm32f103 and USB

[gwenhael.goavec <gwe...@fe...>]

On Wed, 16 Feb 2011 09:33:54 +1300
Gareth McMullin <ga...@bl...> wrote:

> On Wed, Feb 16, 2011 at 8:38 AM, Gareth McMullin
> <ga...@bl...> wrote:
> > Ok, there seems to be a lurking bug in the USB code.  You aren't the
> > first person to have this problem.  I unfortunately can't reproduce the
> > problem with either of the two hosts I have available.
> 
> I've found the problem:  just tried building with summon-arm-toolchain,
> and I observe the same problem.  The build_config_descriptor() function
> uses memcpy() to contruct the configuration descriptor, on entry to memcpy
> an invalid instruction is encountered and the target is found in
> blocking_handler().
> No further USB requests are handled.
> 
> It seems that summon-arm-toolchain is linking in an ARM mode memcpy
> instead of thumb.  This can be solved by adding -mthumb to the linker
> options.
> 
> I've attached a patch to the generic makefile, which just added the full CFLAGS
> to the linker command line.  It solved the problem and should be safe.
> I've also removed the "-Wl,--gc-sections", and changed options to "-O0 -g3".
> The options in git make the examples very hard to debug, and I think this
> may create a barrier to newbies trying out the library.  Especially
> for an example,
> we can give up some size to make things easier.
> 
> Regards,
> Gareth
> 

Hi,
I have just tested after having applied the patch. This ok!
Thank you !
Regards,

Gwenhaël