cards for the uSD slot (was Re: Battery and power questions)

Ron K. Jeffries rjeffries at gmail.com
Tue Nov 2 12:40:02 EDT 2010


Werner,

Roughly what speed in bits per second would you estimate
a microsd/spi interface from Ben can achieve?
---
Ron K. Jeffries
805 567 4670
http://twitter.com/ronkjeffries







On Tue, Nov 2, 2010 at 09:15, Werner Almesberger <werner at openmoko.org> wrote:
> Wolfgang Spraul wrote:
>>> That's probably not possible with Ben. But what about microSD SDIO cards?
>>
>> Werner works on an interesting RF board using 802.15.4 and 6LoWPAN
>> http://en.qi-hardware.com/wiki/File:Atusd-20100908-inserted.jpg
>
> Note that this one isn't SDIO but uses bit-banging to implement a
> form of SPI. (MicroSD has an optional SPI mode, but The MMC
> controller hardware in the Ben's CPU does not support SPI directly.)
>
> There are more things you can do with the uSD slot:
>
> - Rikard Lindstrom made a card that brings out the signals to a
>  prototyping board [1],
>
> - Wolfgang is looking into having such an adapter/cable produced in
>  larger quantities,
>
> - ben-blinkenlights plugs into the uSD slot and drives a line of
>  LEDs [2],
>
> - David "tuxbrain" Samblas made a blinkenlights variant based on
>  Rikard's design [3],
>
> - the c2ben circuit of the f32xbase project is a specialized
>  adapter for programming C8051F32x MCUs (used in ben-wpan/atusb,
>  ben-wpan/cntr, idbg) [4]
>
> - David suggested a serial adapter, where you talk SPI between the
>  Ben and a small AVR MCU, and the AVR then talks RS-232 (at 3.3 V)
>  to some other device.
>
> - David also suggested a USB host adapter, based on ... I think it
>  was the Maxim MAX3421. [5]
>
> [1] http://slashhome.se/p/uSD_breakout/
> [2] http://www.almesberger.net/misc/ben/blinken/blinken-installed.jpg
> [3] http://en.qi-hardware.com/wiki/File:Leds.ogv
> [4] http://downloads.qi-hardware.com/people/werner/f32x/c2ben-run1.jpg
> [5] http://media.digikey.com/pdf/Data Sheets/Maxim PDFs/MAX3421E.pdf
>
> - Werner
>
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