i2s can send now buffers

[aguaviva]

This is more efficient than sending samples individually. Actually my https://github.com/aguaviva/ESP8266-phone wont work fast enough without this call I added.

[earlephilhower]

Great start! If you can make it generally applicable as noted in the review comments, it'll be very handy and reduce CPU significantly!

[aguaviva]

The code looks good but to be honest when I use the buffer function I get slightly distorted audio. I used a logic analyzer to sniff the i2c bus but all seems to be fine (the timings and the test data are correct).

[aguaviva]

I made a small optimization. As I said the code is correct, the sniffing of the I2C bus looks good and it looks like the distortion is coming from my I2C HW (pcm5100) who is causing it, I can't even get a proper sine wave (Checked with my oscilloscope). Please lets move this to the next step :)

[earlephilhower]

Looks good, should be very useful. Thanks!

[aguaviva]

BTW this was my first pull request ever so thanks for your patience :) Silly question, who what am I supposed to do now? Close the pull request?

[devyte]

Nope, now it gets merged, assuming no further comments :)

[devyte]

Only signed => unsigned comments.

[devyte]

Congrats on your first PR! You're done now. This is now available in master branch (aka latest git) and will be released in the next core version.

[aguaviva]

wohoo! :D