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Re: [Paparazzi-devel] =?ISO-8859-1?Q? bootloader + USB VCO?= M

From: martin
Subject: Re: [Paparazzi-devel] =?ISO-8859-1?Q? bootloader + USB VCO?= M
Date: Mon, 21 Jan 2008 22:07:51 +0100 (CET)

Hi Anmopi2,

> I'm trying to use the bootloader application to communicate with a
> LPC2148. I've followed the instructions from
> (
> My application (VCOM application from Bertrik's main page)is linked to
> 0x4000 and I've changed the bootpin in crt.s.
> Those changes are not enough. Does anybody know if what I'm doing can
> done using paparazzi's bootloader?

can you verify (using the gcc map file) that your VCOM code is really
mapped to 0x4000, did you use the "-n" option for the linker when
building? If you are not using the P0.23 as USB detection pin, you have
to set this GPIO high internally to make the USB module work (see
bootloader source code). Can you see your code being executed, like any
serial debug message?

Bertriks USB stack sometimes gets stuck in an irq/polling race condition
(waiting for USB busy bits) when used in interrupt mode as in the
virtual serial port example.


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