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Re: Re: [Paparazzi-devel] USB Flashing

From: Alexis Lussier Desbiens
Subject: Re: Re: [Paparazzi-devel] USB Flashing
Date: Tue, 18 Sep 2007 14:00:19 -0400

> Yes. The very first lines of the bootloader code need to know if it
> should run the ap or bootloader software. That is done by a pin. Either
> P0.23 or any other (if bootloader is changed). You might want to use a
> voltage divider as seen on the Tiny board - the LPC should be 5V proof
> but this USB_Vbus voltage is there at least for a short time while the
> LPC is not powered by 3.3V.
> >  Is it normal that the LED are not always flashing after a
> > power down? I would expect that once the board is flashed you don't
> > always need to reprogram it?
> You need to program only once. But if P0.23 is floating - so is the
> decision between ap and bootloader. Maybe the "Broken pipe" error
> message at the end of download is also related to that floating pin.
> Anyone else using the Classix without P0.23 connected?

Connecting P0.23 to the USB_Vbus solved the "Broken pipe" problem and
the random bootup... it wasn't easy to access P0.23 (it isn't
connected to anything on the Classix) and it is a little bit annoying
not having it in the connector!

You are talking about a version of the board that has the P0.23
included in the serial connector! I can't find it, could you show me
where it is?

Would it be possible to use P0.14? I guess not, because it is used to
program the USB bootloader...


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