Hi, thanks for your answer! I'll definitely have a look at heavy and compare the results with some bits of my own DSP code.
How do you plan to output audio from it? It has SPI that could get you to connect to some DACs but nothing of top quality audio. One can also use PWM to simulate analog out.
I actually thought of connecting ADCs and DACs via SPI, I don't need top audio quality, I'm rather looking for cheap effect/sound boxes :-). On the other hand, the ESP8266 also an I2S interface (dedicated to audio). I've seen videos of people streaming and playing mp3 files with it!
Once I've done my tests (probably not before July), I'll tell my results.
Christof
Gesendet: Montag, 09. Mai 2016 um 17:37 Uhr Von: "Lumis Xulepth" lumis@xulepth.fr An: "Christof Ressi" christof.ressi@gmx.at Cc: pd-list@lists.iem.at Betreff: Re: [PD] LibPd on microcontroller
Hello !
On 2016-05-09 17:01, Christof Ressi wrote:
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-hardwar... 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 have personally used the ESP8266 with either Arduino or the more low-level C SDK from the manufacturer, I like this platform. I have always wanted to see how much it could achieve in terms of DSP. One missing part, though, is the output. How do you plan to output audio from it? It has SPI that could get you to connect to some DACs but nothing of top quality audio. One can also use PWM to simulate analog out.
I think LibPd has too much dependencies and is indeed too intensive to run on such small microcontrollers. Heavy from EnzienAudio might be a better candidate for this as it is optimised for such environments: https://enzienaudio.com/ It's used on recent projects such as Hoxton Owl (https://hoxtonowl.com) and Bela (http://bela.io).
I have personally only made some tests with Heavy so I can't offer more than just sugestions. Still I plan to try it on various hardware platforms from ESP8266 to bigger CPUs.
Hope that helps Lumis/Fergus
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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