ben-wpan: commercial description
dvdkhlng at gmx.de
Tue Jun 7 17:18:51 EDT 2011
>>>>> "Werner" == Werner Almesberger <werner at almesberger.net> 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.
GnuPG public key: http://dvdkhlng.users.sourceforge.net/dk.gpg
Fingerprint: B17A DC95 D293 657B 4205 D016 7DEF 5323 C174 7D40
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Size: 189 bytes
Desc: not available
More information about the discussion