This serves as a proof-of-concept for running RNBO exported patches on the Electrosmith Daisy Seed platform.
The compiled code exceeds the FLASH capacity but fits well within SRAM (approximately 130kB for basic applications using the Seed board). The audio IO functions properly; you simply need to switch to a float buffer instead of the default double (-DRNBO_USE_FLOAT32). I tested this with the vibrato example from the "RNBO Pedal Collection."
This project is a barebones implementation for the Seed, featuring a simple oscillator in gen~ within the RNBO patch.
Since it targets SRAM, you must execute make program-boot first and then make program-dfu while the Seed's LED is in the "breathing" state. This will output a sweeping frequency ranging from 50Hz to 1kHz (frequency set via RNBO param). The signal is disturbed by playing sin(2*x) from a short buffer~. The LED will blink to indicate that some MIDI messages are coming from the RNBO midiout.
All the essential configurations are in the Makefile (-D flags), compat directory, and main.cpp. -fexceptions is obligatory, though it seems that no compiled code use exceptions, image does not run on Seed without it.
rnbo/* and rnbo_source.cpp autogenerated and unaltered. libDaisy located in the submodule. Optional memory management is introduced in the memmgr directory for allocating RNBO buffers in SDRAM. However, this is optional, and you can use the regular heap; just adjust DaisyPlatform.h to call regular malloc/free or your custom memory manager.
With -DRNBO_SIMPLEENGINE flag defined, you don't need to compile RNBO_Engine.cpp and RNBO_ParameterInterfaceAsync.cpp. This setup employs a core engine and synchronous event processing that doesn't rely on threads or mutexes.
It's a straightforward and rudimentary example, intended to demonstrate that this setup can function without Linux or RTOS.