Ben and Ethernet

Rikard Lindström ornotermes at gmail.com
Tue Aug 31 15:17:48 EDT 2010


On Tue, Aug 31, 2010 at 7:12 PM, Werner Almesberger <werner at openmoko.org> wrote:

> The CPU has SPI. Alas, not on the MMC/SD slot, and the keyboard is
> sitting on the SPI lines.

Yes, I'm sorry, i meant on the SD interface.

> Unless you need large data transfers (networking, storage, etc.),
> bitbanging is probably just as fast as using dedicated hardware.

Maybe a micro controller could interface between SDIO and SPI (or
other protocols), at least to free some CPU time.

> Nice ! I measured the thickness a uSD card: the contact area is
> about 0.7 mm, the whole card about 0.8 mm. So a 0.8 mm board
> should fit nicely

I have a layout ready and uploaded on
http://slashhome.se/p/uSD_breakout/ now. But it might be a bit hard to
etch (0.2mm between the pads right now).




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