[sdiy] $53 Intel Edison dual 500MHz Atom 1GB RAM SOC board has I2S

[Robin Whittle]

Here's something promising for compact low-cost DSP work, as an
alternative to the ARM chips we discussed recently.

  http://au.mouser.com/new/Intel/intel-edison/

It is a small PCB with a dual core 500MHz Airmont Atom CPU (22nm, out of
order execution), 1GB of RAM and a bunch of flash memory.  It also
contains a separate 100MHz "Quark" microcontroller, which I known
nothing about.

Since the Atom cores surely have floating point, I guess this would be a
very capable system for DSP.

The product brief:

  https://communities.intel.com/docs/DOC-23139

mentions one "I2S controller".  It also has WiFi, Bluetooth, USB 2.0 and
an SD Card interface.  There's no wired Ethernet interface.

It runs Linux and there is a breakout board, which would surely be
needed, since all connections are via a very small connector:

  https://communities.intel.com/docs/DOC-23252

The Compute Module Hardware Guide at:

  https://communities.intel.com/community/makers/edison/documentation

shows the pins for:

   I2S2 receive data (input)
   I2S2 clock (output)
   I2S2 frame sync (output)
   I2S2 transmit data (output)

but I can't see these signals mentioned in the breakout board doco.

Googling Intel Edison CODEC leads to some pages of likely interest:

  https://communities.intel.com/thread/55804

    I get the impression the signal voltages are 1.8V and there are
    a number of steps required regarding kernel modules etc. before
    a CODEC can be interfaced.