Thanks! Yes I'm getting great results with RPi Zero, using an I2S DAC. I will look into FreeRTOS, ChibiOS, eCos.
On Mon, Dec 31, 2018 at 5:50 AM Carlo Bramini <carlo.bra...@libero.it> wrote: > Hello! > yes, I succeded to run FluidSynth on an embedded platform. > I have built a digital piano and I used FluidSynth as a rendering engine. > > First of all, I would like to suggest you to read this message: > > http://lists.nongnu.org/archive/html/fluid-dev/2018-11/msg00022.html > > with some results from my experiments. > > I suggest you to abandon the idea to use things like Arduino and similar, > they are simply not powerful enough. Technically, something like the > Raspberry Pi, even the Zero version, and other single board computers are > the best and the cheapest solution for running FluidSynth. > But as you already noticed, their boot time is very slow, if compared to > an usual microcontroller which is up and running in few milliseconds. I > know that there are some ports of RTOS for the Raspberry Pi, like FreeRTOS, > ChibiOS and eCos, but I never tried them. > > It depends on what you want to do: in my project, I did a small board with > a PIC18F25K50 for scanning the keyboard matrix of the piano and provides an > USB port and the legacy MIDI-IN/MIDI-OUT. Then, I could connect to the USB > port with several hosts like a PC or a phone. > I also tried to do some all-in-one solutions, with an embedded ARM Cortex > M3 or a PDA, but I was not able to get decent results, as you could read in > the report that I linked in this email. > > So, if the all-in-one is what you want, my suggestion is to try again with > a single board computer (Raspberry Pi is good, but you must also remember > to add an I2S DAC because PWM audio is bad and slow) and try one of the > RTOS solutions currently available. Porting is not difficult, I did some of > them (Windows, DJGPP and others) without much problems. However, if you > have some doubts, just ask. > > Sincerely. > > > > Il 30 dicembre 2018 alle 20.55 Geoff Plitt <ge...@gweb.org> ha scritto: > > > > I'm working on a musical instrument that uses FluidSynth for playing > SoundFonts, works great. But I'm using Raspberry Pi (Raspbian) and there's > a 30-60 second boot time, so I'm looking at other platforms with > sub-5-second boot time. I'm really looking to replicate the experience of > hardware synths, where you turn it on and it's ready to make sounds in a > few seconds at most. > > > > Has anyone had success building/running FluidSynth on an embedded > platform with minimal OS, like Arduino, Teensy, Adafruit Feather, etc? > Let's say the system has an SD card and DAC/amp to output audio to little > speakers, but not a full POSIX environment. > > > > I found https://github.com/divideconcept/FluidLite but it doesn't > include audio output and doesn't look maintained. > > > > My other approach might be to strip out unnecessary parts of Raspbian to > get a fast boot time, but the documentation I've found still indicates it's > hard to get under 10 seconds. > > > > _______________________________________________ > > fluid-dev mailing list > > fluid-dev@nongnu.org > > https://lists.nongnu.org/mailman/listinfo/fluid-dev > > _______________________________________________ > fluid-dev mailing list > fluid-dev@nongnu.org > https://lists.nongnu.org/mailman/listinfo/fluid-dev >
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