Polyphony for the Daisy Seed

[ghoppla]

Polyphony for the Daisy Seed

Compiling faust generated cpp using faust2daisy with -nvoices > 1 fails because of dynamic_casts in poly-dsp.h

ex_faust.cpp: In member function 'void dsp_voice_group::buildUserInterface(UI*)':
ex_faust.cpp:10312:35: error: 'dynamic_cast' not permitted with '-fno-rtti'
10312 |             if (!fGroupControl || dynamic_cast<SoundUIInterface*>(ui_interface)) {
      |                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ex_faust.cpp: In member function 'virtual void mydsp_poly::buildUserInterface(UI*)':
ex_faust.cpp:10669:17: error: 'dynamic_cast' not permitted with '-fno-rtti'
10669 |             if (dynamic_cast<midi_interface*>(ui_interface)) {
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ex_faust.cpp:10670:32: error: 'dynamic_cast' not permitted with '-fno-rtti'
10670 |                 fMidiHandler = dynamic_cast<midi_interface*>(ui_interface);
      |                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
make: *** [/home/georg/Programmierung/daisy/libDaisy/core/Makefile:271: build/ex_faust.o] Fehler 1

Removing the -fno-rtti Option in libDaisy shouldn't be considered: https://github.com/electro-smith/libDaisy/issues/503

Steps for reproduction

Versions Used:

• Faust v2.76.0
• libDaisy v7.1.0

Daisy Toolchain Setup on Linux:

1. Create a folder, e.g.

   $ mkdir ~/daisy
   

2. Get arm-none-eabi:

   • See DaisyWiki

3. Get libDaisy:

   $ git clone --recurse-submodules https://github.com/electro-smith/libDaisy
   

4. Create environment.rc file with the following content:

   export LIBDAISY_DIR=~/daisy/libDaisy
   
   GCC_PATH=~/daisy/gcc-arm-none-eabi-10-2020-q4-major/bin
   export PATH=$GCC_PATH:$PATH
   

5. Compile libDaisy:

   $ source environment.rc
   $ cd libDaisy
   $ make
   

** Compilation: **

1. dsp file minimal_example.dsp

import("stdfaust.lib");
declare name "Daisy Seed Bug";
declare options "[midi:on]";
declare options "[nvoices:4]";

gate = button("gate");
vel = hslider("gain", 0, 0, 1, .01);
freq = hslider("freq", 440, 0, 20000, 0.01);

process = os.triangle(freq) * vel : _*en.adsr(.1,.1,.7,.2, gate) <: _,_;

2. Generated cpp code with:

$ faust2daisy -nvoices 4 -midi -sr 48000 -bs 32 -uim -source minimal_example.dsp

[DBraun]

I got it to compile with some changes

struct FAUST_API UI : public UIReal<FAUSTFLOAT> {
    UI() {}
    virtual ~UI() {}
    // add both below
    virtual bool isSoundUI() const { return false; }
    virtual bool isMidiInterface() const { return false; }

class FAUST_API GenericUI : public UI
{
    public:
        GenericUI() {}
        virtual ~GenericUI() {}
        // add this:
        virtual bool isSoundUI() const override { return true; }
}

Inside class MidiUI public methods add

virtual bool isMidiInterface() const override { return true; }

Inside dsp_voice_group::buildUserInterface(UI* ui_interface), change

if (!fGroupControl || dynamic_cast<SoundUIInterface*>(ui_interface)) {

to

if (!fGroupControl || ui_interface->isSoundUI()) {

Inside mydsp_poly::buildUserInterface(UI* ui_interface), change

if (dynamic_cast<midi_interface*>(ui_interface)) {
        fMidiHandler = dynamic_cast<midi_interface*>(ui_interface);

to

if (ui_interface->isMidiInterface()) {
        fMidiHandler = reinterpret_cast<midi_interface*>(ui_interface);

[sletz]

OK, but I don't want to change the UI interface in general. So an acceptable solution would be to use conditional compassion line #ifdef DAISY {....} #endif everywhere needed.

[ghoppla]

Hi David Braun, thank you very much for your work about the daisy support. I tried your code and fixed two little bugs (see PR #1106 ).

Currently, I don't get any sound out of my daisy seed board. I will debug the code using the st-link debugger...

[DBraun]

Thanks for those fixes! Maybe it's silent because the device is expecting MIDI from one of the 3.5 mm input, using https://electro-smith.com/products/trs-3-5mm-midi-adapter not micro-USB?

[ghoppla]

Hi David, unfortunately it doesn't seem to be that easy.

I checked that by generating the following faust dsp with faust2daisy -midi -nvoices 2 -sr 48000 -bs 32 -source poly.dsp

import("stdfaust.lib");

freq = hslider("freq",440,50,2000,0.01);
gain = hslider("gain",1,0,1,0.01);
gate = button("gate");
envelope = en.adsr(0.1,0.2,0.9,0.3,gate)*gain;
process = os.sawtooth(freq)*envelope <: _,_;
effect = _+os.sawtooth(440), _+os.sawtooth(440);

So using effect you should get a tone without any midi messages (normally I use usb midi and was too lazy to add my crappy midi breakout board).

Then I updated libDaisy to be sure that this is not the issue. Doing that I got stuck with an annoying little bug we created (see PR #1107).

After fixing this I added

# Debug Symbols
DEBUG = 1

# Optimization Level (default: -Os for size optimization)
OPT ?= -Og

to the makefile.

Then I've used the st-link v2 debugger to check the code execution. It ends up in the hard fault handler when calling a ui function:

Call Stack: ex_faust.cpp main() MidiMeta::analyse mono_dsp->buildUserInterface(&jsonui); ui_interface->openVerticalBox("poly"); or (the weird thing is... if I do not try to jump into the functions I get one step further oO) ui_interface->addHorizontalSlider("freq", &fHslider0, FAUSTFLOAT(4.4e+02f), FAUSTFLOAT(5e+01f), FAUSTFLOAT(2e+03f), FAUSTFLOAT(0.01f));

It stops at the following breakpoint in the Hardfault Handler: if(SCB->CFSR & SCB_CFSR_IMPRECISERR_Msk)

So for today I'm out -_- Maybe you guys have an idea!