IDBG - any suggestions ?

Kristoffer Ericson kristoffer.ericson at gmail.com
Thu Jul 15 15:56:58 EDT 2010


On Thu, Jul 15, 2010 at 08:44:02AM -0300, Werner Almesberger wrote:
> I'm about to start making a new revision of the Internal Debug Board
> (IDBG) for the Ben and I'm looking for suggestions for improvements.
> 
> IDBG ...
> 
> - is a small add-on board that goes inside the Ben,
> - connects to USB through its own Micro-USB receptacle,
> - provides a serial console with both TX and RX,
> - can switch USB boot on and off, as commanded by the host,
> - lets the host command a hardware reset,
> - has a dual USB stack that allows the regular firmware (Open Source,
>   of course) to be updated via DFU.

Very sweet hardware and an nice "upgrade" for the ben. Good job.

> 
> I made IDBG originally for the Openmoko phones. You can find
> descriptions and photos here:
> http://www.almesberger.net/misc/idbg/
> 
> The git repository with firmware sources and design files is here:
> http://www.almesberger.net/misc/idbg.git
> 
> This is what the IDBG looks like (before adding connections to
> the Ben's main PCB):
> http://www.almesberger.net/misc/ben/idbg-v1-pcb.jpg
> 
> This is what a Ben looks like from the outside with IDBG installed:
> http://www.almesberger.net/misc/ben/idbg-v1-case.jpg
> 
> What I plan to change in the next hardware revision is:
> 
> - consider simplifying the "Ben is powered up" detection,
> - make the board a bit larger to accommodate the changes below,
> - add a separate pad for RESETP_N. Right now, RESETP_N comes from
>   P3_0, which means that one has to run the cable around the board in
>   a U shape, which isn't nice.
> - rearrange the pads such that the wires don't get into each other's
>   path,
> - maybe add an explicit ground pad,
> - maybe add an explicit VBUS or VDD pad (for in-circuit programming),
> 
> All this should make it easier to install it in a Ben. Speaking of
> which, is anyone considering to actually build it ?
> 
> By the way, do we have data sheets of the Ben's speaker somewhere ?
> 
> - Werner
> 
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