ben-wpan: commercial description

David Kuehling dvdkhlng at
Tue Jun 7 17:18:51 EDT 2011

>>>>> "Werner" == Werner Almesberger <werner at> writes:

> David Kuehling wrote:
>> just wondering about that paragraph: you mean the atben does not
>> implement SDIO?  So what protocol are they talking?  Sounds like you
>> imply it does bitbanging.

> Yes, that's correct. The transceiver needs full SPI (4 signals) plus
> 2-3 control signals (reset, interrupt, a multifunctional pin called
> SLP_TR). In the case of atben, we cheat a little and do only power-on
> reset, saving the 7th pin.

> Since there's no "pure" SPI available on the pins of the 4720's MMC
> controller (alas, it doesn't implement MMC SPI mode), the way to go is
> bit-banging. The maximum over-the-air bit rate is 2 Mbps, so
> bit-banging is sufficiently fast, if a little CPU-hungry.

I guess handling the IRQ pin via polling is especially a waste of
CPU-cycles.  Well, but for modem-like datarates it's maybe really not a

I'm really looking forward to using my Ben without the cable.

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