[PD] Fw: Aw: Re: LibPd on microcontroller

[cyrille henry]

Le 10/05/2016 10:48, Christof Ressi a écrit :
> I wrote
>
>> Since you got DSP stuff working on an Arduino Due, it should also work on an ESP8266, I guess...
>
> Now I just realized you did everything with 32 bit integer math. I'll forget about audio synthesis on ESP8266 and rather check out the CHIP.
you're not so crazy after all!

>
> Thanks so far!
>
>> Gesendet: Dienstag, 10. Mai 2016 um 00:37 Uhr
>> Von: "Christof Ressi" <christof.ressi at gmx.at>
>> An: "cyrille henry" <ch at chnry.net>
>> Cc: pd-list at lists.iem.at
>> Betreff: Aw: Re: [PD] LibPd on microcontroller
>>
>> Hi,
>>
>> I've read your mail, it actually was the key source of inspiration for trying out DSP on a microcontroller!
>>
>>> in fact, I did not recommend audio processing on hardware that did not have support for float arithmetic.
>>> (only me or crazy nerd do that).
>>
>> I might be crazy as well then :-). I just wanna give it a try and see how far I'll get. I'm just excited about the low price of these modules, given their rather fast speed (and of course the integrated WiFi functionality!). I'm dreaming of tiny effect/sound modules that do a certain DSP job and receive/send messages via WiFi.
>>
>>
>>> a micro controller to use is for example the cortex M4. You  can find them on the teensy hardware.
>>
>> Apparantly the Teensy 3.x uses the non-FPU version of the cortex M4:
>> https://forum.pjrc.com/threads/25909-Teensy3-1-and-FPU-%28Floating-Poitn-Unit%29
>>
>> Right now I can't see any advantage over the ESP8266. Also it costs about 4 times as much!
>>
>> Some guy made a benchmark test between ESP8266, Teensy 3.1 and Arduino Due:
>> http://forum.arduino.cc/index.php?topic=337653.0
>>
>> The ESP8266 wins for floating points (and loses clearly for integers).
>>
>> Since you got DSP stuff working on an Arduino Due, it should also work on an ESP8266, I guess... But it's my task to find out.
>>
>> By the way, what kind of interface did you actually choose for the audio output and have you tried several methods?
>>
>> Thanks for sharing your experience!
>>
>> Christof
>>
>>
>>
>>
>>
>>
>>
>>
>>> Gesendet: Montag, 09. Mai 2016 um 17:39 Uhr
>>> Von: "cyrille henry" <ch at chnry.net>
>>> An: pd-list at lists.iem.at
>>> Betreff: Re: [PD] LibPd on microcontroller
>>>
>>> hello,
>>>
>>> I recently send a mail in this list describing my experience of audio synthesis on microcontroler, but i did not use libpd.
>>>
>>> i did not recommend libpd for microcontrolers.
>>>
>>> in fact, I did not recommend audio processing on hardware that did not have support for float arithmetic.
>>> (only me or crazy nerd do that).
>>>
>>> a micro controller to use is for example the cortex M4. You  can find them on the teensy hardware.
>>> teensy also provide a audio synthesis library, and is supported by arduino IDE.
>>>
>>> You can also have a look at the heavy compiler if you want to embedded a pd patch.
>>>
>>> Cyrille
>>>
>>>
>>>
>>>
>>> Le 09/05/2016 17:01, Christof Ressi a écrit :
>>>> Hi,
>>>>
>>>> has anyone experience in using LibPd on a microcontroller?
>>>> I wanna try to run some rather basic DSP code on this guy here:
>>>> https://www.olimex.com/Products/IoT/MOD-WIFI-ESP8266-DEV/open-source-hardware
>>>> There are some existing Arduino/C++ frameworks and I thought I could either write my own small DSP library in C++ or use LibPd.
>>>>
>>>> I understood that LibPd is completely independed of audio drivers and external libraries and since it's plain C code it should work on everything that can run code. However, I have only encountered LibPd in the context of other applications (processing, openFrameworks) and mobile devices so far. Do you think it could work on an ESP8266? I'm also a bit concerned about efficiency, as computation power is rather limited:
>>>>
>>>> "ESP8266EX is embedded with Tensilica L106 32-bit micro controller (MCU), which features extra low
>>>> power  consumption  and  16-bit  RSIC. The  CPU  clock  speed  is  80MHz.  It  can  also  reach  a  maximum
>>>> value  of  160MHz.  Real  Time  Operation  System  (RTOS)  is  enabled.  Currently,  only  20%  of  MIPS  has
>>>> been  occupied  by  the  WiFi  stack,  the  rest  can  all  be  used  for  user  application  programming  and
>>>> development."
>>>>
>>>> Christof
>>>>
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