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Re: [Paparazzi-devel] No USB device error

From: Marko Thaler
Subject: Re: [Paparazzi-devel] No USB device error
Date: Tue, 27 Jul 2010 00:47:01 +0200

Hello Anton,

I apologize for not being clear about my power supply. I power Booz with adjustable power supply connected to the +- pads. At 10V the current is 0.04A, which is OK.

I mentioned the USB input voltage just to stress that the LPC should get the signal to wait for programming through USB (first connecting the USB, than the power supply). In any case dmesg should show the new USB device connected message, but it does not!

Thank you for your help,


On Jul 26, 2010, at 11:58 PM, <address@hidden> wrote:

The booz board cannot be powered through 5V.  The actual power pin is not routed to the board, its simply routed to detect the presence at power on.  You must power the board from another source.  The best source would be from the + and - pads on the board.  Anythign right around 12V would be great.

-------- Original Message --------
Subject: [Paparazzi-devel] No USB device error
From: Marko Thaler <address@hidden>
Date: Mon, July 26, 2010 1:23 pm
To: address@hidden

Hello everybody,

I am testing a newly assembled Booz main board. Loading the USB Boot Loader went smoothly.

However, when I try to program it through USB, I get a no USB device error. USB access rights and device rules are OK. Dmesg and lsusb do not detect the board.

I have tested all the mini-USB connections on the board and everything is fine. The board input voltage through USB is 5V (USB_VBUS), however USB_VBUS_3V3 line (P0.23 pin) has 0V - the voltage drop on R9 is 5V!

Any suggestions what to try next?

Thank you for your help.

Kind regards,


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