>>>>> "Werner" == Werner Almesberger <[email protected]> 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 problem. I'm really looking forward to using my Ben without the cable. David -- GnuPG public key: http://dvdkhlng.users.sourceforge.net/dk.gpg Fingerprint: B17A DC95 D293 657B 4205 D016 7DEF 5323 C174 7D40
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