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. - Werner _______________________________________________ Qi Hardware Discussion List Mail to list (members only): discussion@lists.en.qi-hardware.com Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
