On Sat, Nov 29, 2008 at 04:37:06PM +0000, Folderol wrote: > On Thu, 27 Nov 2008 23:35:52 +0000 > simone-www.io-lab.org <cimo75@xxxxxxxxx> wrote: > > > hi > > arduino is a bit slow but if you need only a few pots to tweak > > parameters building up a song it may be ok. > > I wouldn t advise it if you need something for live acts with sensors, > > or you are going to multiplex the analog inputs. > > For a quick, darn cheap and easy (and high resolution: 10bit) little > > device i ve built a couple of these: > > http://1010.co.uk/avrhid.html > > these ones send HID protocol to USB, very fast and 10bit resolution, 8 > > analog ins and 6 digital ins. > > About coding and different language, MIDIBox has a great approach > > (anyboy noticed I am a big MIDIBox fanboy?): there is a first > > bootloader to be loaded with a burner, only 1 time, then all the code > > is sent via MIDI sysex; this loader is written in ASM. > > Then there is a lower level OS called MIOS, also written in ASM and > > optimized for preemption, all basic functions for ADCs, G/CLCD, > > digital inputs, multiplexing, you name it, are coded here. > > On top of that there is the end application that can be written in C > > or ASM, toolchains/compilers exist both for C and ASM (you build with > > the same command both the languages) and are ported to all 3 major > > OSs. > > Need more? Soon you ll get the new CORE32 ARM Cortex. > > Need info? MIDIBox is backed by one of the most friendly and competent > > community. > > Linux, Open Source? The project is Open Source and you are only > > restricted not using it for commercial purposes.I am planning to port > > as many boards as possible to Kicad and there is also a project > > running aiming at create an Ubuntu-Studio based collection of packages > > that will set you up to go with MIDIBox: all compilers, boards > > designs, svn to get latest code, sysex loaders, MIDI troubleshooting, > > burner again, you name it. > > Simone > > Although I was initially quite interested to see this, and very much > liked the small size, after reading through I have severe misgivings > about this project. > > The first issue I have is that of doing all the USB work in software > rather than a dedicated chip. This takes up both processor time and > memory from a little processor that doesn't have too much of either. > Even with that, I notice that only USB 1.1 is implemented > - and not completely. > > The other major problem I see, is that the author of the code first > says it is GPL, then give a restriction that you must make your > firmware available. The is *not* compatible with the GPL and suggests > he/she doesn't have a proper understanding of it. I have no objection > to people putting whatever restrictions they like on their work so long > as they don't say it's something that it isn't. > > > ttymidi is a small software module available for Linux that enables > you to connect serial data (either via a D connector or via USB>serial) > directly to a virtual MIDI port, and is thus ideal for any PIC or atmega > microprocessor. The only quirk it has is that it expects the serial > side to *always* send 3 bytes of data per command, which it will then > pass on as genuine MIDI (dropping the spare bytes). This actually makes > it easier to program the remote device, which I suspect is the main > reason it was done. > > Under these circumstances the Arduino board comes out streets ahead. > Not only does it have a dedicated USB/Serial chip, but it also has the > full 12x digital inputs, as well as 5x10bit analoge inputs. > > The arduino firmware and programming software is fully GPL although the > Arduino name and hardware has a commercial restriction on it (clearly > stated). However the reference drawings for creating your own boards > are CC licensed so again you are free to do as you like with them. > > Now all we need is fro someone to produce versions of ttymidi for > Windows, and for the Mac :) I've long since lost the links, but I remember seeing little programs for Windoze and Mac which translate MIDI sent over a class-compliant USB Serial device (i.e. Arduino) into appearing to be a MIDI device to CoreAudio or whatever the equivalent(s) is(are) on Windoze. -ken _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
