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Old 22nd January 2015, 02:48 AM   #1
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Default Intel Edison I2S DAC

I'm looking to create a digital audio project utilizing the intel edison.

I know this forum is popular using BBB and rPi but the edison is just as temping hardware.

It doesn't look like anyone has used I2S yet on the edison (or measured USB audio).

I'll try to keep this thread updated if I see anything related pop-up on the net.

If you know any details. Please post here.

Intel community question about I2S
diyaudio.com question
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Old 27th January 2015, 09:18 PM   #2
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From Intel® Edison Module Hardware Guide

4.5 I2S interface
An I2S interface is available on pins 50, 52, 54, and 56. All of the I2S modes below have not been verified and are subject to change.

Table 6 Edison I2S available formats
Mode (Priority)
Frame rate
Bits/sample
Number of slots
Frame to-data offset
Frame polarity
Frame width
Frame rate inaccuracy
Notes

I2S master (priority 1)
192K, 96K, 48K, 16K, 8K
16, 24 2 1 0-left, 1-right
50/50 0%
Standard I2S protocol. 50% duty cycle on frame.

PCM slave - SFS (priority 1)
192K, 96K, 48K, 44.1K, 16K, 8K
16, 24 192 kHz: 2
96 kHz: 4
All else: 1 to 6 0 High

PCM slave - LFS (priority 1)
192K, 96K, 48K, 44.1K, 16K, 8K
16, 24 192 kHz: 2
96 kHz: 4
All else: 1 to 6 0 High

PCM master - SFS (priority 1)
1 192K, 96K, 48K, 16K, 8K
16, 24 192 kHz: 2
All else: 1 to 4
0 High 1 bit clockwide 0%
Rising edge frame sensitive. Design supports more frame-to-data offset options.

PCM master - LFS (priority 1)
1 192K, 96K, 48K, 16K, 8K
16, 24 192 kHz: 2
All else: 1 to 4
0 High 1-bit to n-bit clocks 0%
n is the width of one slot. Design supports width > 1 slot.

Left justified master (priority 2)
2 192K, 96K, 48K
16, 24 2 0 0-left,
1-right
50/50 0%
Design supports flipping polarity on the frame signal.

I2S slave (priority 3)
192K, 96K, 48K, 44.1K
16, 24 2 0 0-left,
1-right
50/50 0%

Left justified slave (priority 3)
192K, 96K, 48K
16, 24 2 0 0-left,
1-right
50/50 0%

Right justified
Not supported.

Last edited by jarrettv; 27th January 2015 at 09:20 PM.
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Old 28th January 2015, 09:34 PM   #3
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Another intel edison discussion on I2S drivers
Quote:
As the I2S is using the SSP2 pins (also available on Arduino "block") I assume that Intel MID SSP driver like the one here could propably work (maybe with some modifications):
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Old 11th February 2015, 07:11 PM   #4
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Location: Tampere Finland Europe
Intel promised to publish the I2S documents, guess they haven't got time or interest for the task.
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