- Fri Apr 01, 2016 4:07 pm
#44645
Arduino is just way more work than I'm willing to put in. It is currently only C - but - it could likely be ported. I would be more than happy to accept a change to the main branch. I don't think I linked it... https://github.com/cnlohr/esp8266duplexi2s/
- Wed Aug 17, 2016 5:01 am
#53124
Hi I cannot install your project please help me out solve the issues.
- Sat Oct 01, 2016 10:08 pm
#55968
Hi Shawn, did yu ever get anywhere with this? I'm also trying to add an I2s mic to my esp setup. Would be super interested to hear any experiences you might have had
Shawn Murray wrote:cnlohr wrote:I feel weird double-posting, but wanted to make a seprate note. Added my duplex thing here: https://github.com/cnlohr/esp8266duplexi2s/ It's a working project with it.
Anyone use this code yet? Waiting on my boards from OshPark to test with a i2s mic.
Hi Shawn, did yu ever get anywhere with this? I'm also trying to add an I2s mic to my esp setup. Would be super interested to hear any experiences you might have had
- Mon Aug 14, 2017 3:15 pm
#69059
Hi guys,
I wanted to use a I2S microphone SPH0645 with the esp8266. Although I never finished the application (due to lack of time) I had some interesting insights.
First I downloaded and managed to run the "Unofficial Development Kit for Espressif ESP8266". It contains an i2s-full-duplex example that served as a good starting point. I.e. the example sets up a 24 bit i2s-full-duplex-transfer.
One of my main problems when reading the esp8266 technical reference manual was how to adjust the number of bits. I think they just forgot to explain it. Nevertheless the example writes 4 bits to the I2SCONV-register starting at offset 12 (I2S_BITS_MOD_S). That number can go from 0 to 15. With a scope I saw that this changed the bits from 16 to 31. So for 24 bits set the number to 8.
But the spec of the microphone SPH0645 say it requires 32 bits per sample.
Yet for my test it also worked with 31 bits. (It didn't work with 30 bits though.)
So that's it. I hope this might help someone.
I wanted to use a I2S microphone SPH0645 with the esp8266. Although I never finished the application (due to lack of time) I had some interesting insights.
First I downloaded and managed to run the "Unofficial Development Kit for Espressif ESP8266". It contains an i2s-full-duplex example that served as a good starting point. I.e. the example sets up a 24 bit i2s-full-duplex-transfer.
One of my main problems when reading the esp8266 technical reference manual was how to adjust the number of bits. I think they just forgot to explain it. Nevertheless the example writes 4 bits to the I2SCONV-register starting at offset 12 (I2S_BITS_MOD_S). That number can go from 0 to 15. With a scope I saw that this changed the bits from 16 to 31. So for 24 bits set the number to 8.
But the spec of the microphone SPH0645 say it requires 32 bits per sample.
Yet for my test it also worked with 31 bits. (It didn't work with 30 bits though.)
So that's it. I hope this might help someone.
