[sdiy] Synstack - Forth based audio DSL for STM32

[Pete Hartman]

Forth is a programming language.  Very low level but also very extensible,
been around quite some time.

There are notes on forth in the PDF that Karsten sent, to give you a flavor
of it:

https://cdn.hackaday.io/files/9374401057216/20160215-synstack.pdf

Pete


On Thu, Feb 25, 2016 at 8:33 AM, Chris Juried <cjuried at yahoo.com> wrote:

> Hi Karsten,
>
> Can you explain Forth, please?
>
> Best,
>
> Chris
> http://www.JuriedEngineering.com
>
> On Wed, Feb 24, 2016 at 7:22 AM, Karsten Schmidt
> <info at toxi.co.uk> wrote:
> Hi guys,
>
> I've been an interested reader/lurker on this list for the past few
> months, but this is my first post :) Over the past year I've been
> working on a number of STM32 based synth implementations with a view
> of creating a Forth based audio DSL for embedded devices. Since Forth
> is sitting in an interesting spot between compiled and interpreted
> modes, it'll also be soon possible to do livecoding directly on the
> device. But even without that, Forth is naturally fitting, as well as
> sufficiently compact & highlevel to succinctly define stacks of DSP
> operations (i.e. synths)
>
> I've started with an STM32F401 dev board, but meanwhile have focused
> on the new(er) STM32F746-DISCO to also be able to generate UIs for the
> synths.
>
> Audio samples:
> https://soundcloud.com/forthcharlie/sets/stm32f4
>
> Project summary:
> https://cdn.hackaday.io/files/9374401057216/20160215-synstack.pdf
>
> Project log:
> https://hackaday.io/project/9374-stm32f4f7-synstack
>
> The current implementation is written in 95% portable C, but am in the
> process of rewriting it in Asm to avoid the overhead of C calling
> conventions (it will still be embeddable in C project though). The
> Forth VM incl. a bunch of native audio operators is ~24KB, the core
> dictionary (basically the system library, most of Forth is written in
> Forth) adds another 8KB, but will grow to probably double that.
>
> I'm planning for an initial open source release in April, but just
> wanted to share the project with you already. Furthermore, I hope it's
> okay to do so here, I'll be running 2 workshops about this in April
> too. Details are on my website...
>
> K.
> --
> Karsten Schmidt
> http://thi.ng
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