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-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 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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