Hi Matthieu!

I missed your post on the FreeBASIC forum 
<http://www.freebasic.net/forum/viewtopic.php?p=208024>, sorry. 
Unfortunately you deleted the text.

I think you need not redo all your work. It should be possible to reach 
your target when you organize the data flow as William said: "Where client 
side javascript can deal with all the heavy work.".

The problem is to fetch the data on BBB in real time, which is impossible 
with sysfs. Instead use libpruio <http://beagleboard.org/project/libpruio/>. 
You'll have better control over the ADC subsystem and you can read the data 
asynchronously from a ring buffer. AFAIK there's no (complete) JavaScript 
binding jet, so this code should be done in C/C++ or FreeBASIC. (There's 
also a Python binding, which seems to work in this project 
<https://www.youtube.com/watch?v=3cXCUmCWQHQ>).

BR

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