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Re: [Paparazzi-devel] Problems with the FBW processor on the Classix bo

From: Christophe De Wagter
Subject: Re: [Paparazzi-devel] Problems with the FBW processor on the Classix board
Date: Mon, 12 Jul 2010 15:56:17 +0200

Dear Josselin,

The crystal is connected to 1 processor with 2 tracks (Xtal-in and XTal-Out) and to the other processor only using 1 track (XTal-in). A crystal needs to be activated before it oscillates, but the crystal output can be used by multiple 'users' (as long as there input has the correct load)

Just checking; you are using the FBW-serial(+usb) connector when flashing the FBW code (which is not the same as the AP-serial)?


On Mon, Jul 12, 2010 at 11:54 AM, Josselin Vallet <address@hidden> wrote:

I am using your Classix development board on a drone project and I need your advices for some problems with it.
More exactly one the two processor is not working and can't even be programmed using the serial port.

The problem is only with the FBW processor, the AP processor works very well.
I tried to identify the causes of this malfunction but I didn't manage to do it successfully.

I checked the different voltages: they seem to be fine, and the differents GND pins too.

I did the step "check the 12MHz at LPC pin 61, XTAL2 (XTAL_out) " found on your wiki pages. This worked on the AP processor (a signal is visible on the oscilloscope), but no signal is visible when trying this on the FBW processor.

I tried to understand the connection of the FBW pin 61 and 62 on the eagle map but I don't understand why the XTAL_out (pin 61) of the FBW is directly connected to the oscillator.

Does this malfunction simply means the FBW processor is dead ?

Thanks you for your advices.

Josselin Vallet
ENSMA Engineering School

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