Arduino i driver USB
De Wikijoan
He enviat un mail a la LAD. Vull que si tinc un projecte fet amb arduino, per ex un controlador MIDI, sigui USB-compliant i que m'aparegui a la llista d'aconnect.
<pre> I think its more a task of "make arduino behave as a standard-compliant usb- midi device". If you have that code, please share it :-) Have fun, Arnold
Not possible with the old Arduinos (FTDI chip), but super easy with the new generation, the Arduino Uno: http://arduino.cc/en/Main/ArduinoBoardUno Flo
Thanks for make me remember ttymidi. I tried it and is perfect for the purpose to connect arduino to fluidsynth. Returning to the problem..., I imagine something like plugging arduino and appearing automatically in aconnect. Maybe the solution is to hack the FTDI driver. FTDI is the chipset that converts serial to USB, and needs an FTDI driver to create a virtual COM port: /dev/ttyUSB0. The solution could be hacking the FTDI driver with the ALSA libraries driver and making it an ALSA sequencer port. Joan Q
In theory you could reprogram the FTDI chip to appear to be a class-compliant MIDI device. Since a MIDI port is just a serial port with a funny baud rate and a current-loop interface, it shouldn't be hard - you don't care about the physical interface and the software interface just throws bytes down a serial port. You could use ttymidi to receive data from the arduino, but not send MIDI to it. Of course, you could launch ttymidi from a udev script so that when you plug in the arduino it fires up and lets the port appear. Gordon MM0YEQ
Aquí està l'aportació més interessant:
Hi, I've done that with the V-USB lib from obdev.at: "V-USB is a software-only implementation of a low-speed USB device for Atmel�s <http://www.atmel.com/> AVR� microcontrollers, making it possible to build USB hardware with almost any AVR� microcontroller, not requiring any additional chip.V-USB can be licensed freely under the GNU General Public License or alternatively under a commercial license." http://www.obdev.at/products/vusb/index.htm The project discussion: http://forums.obdev.at/viewtopic.php?f=8&t=1352 Project page, schematics and software download: http://cryptomys.de/horo/V-USB-MIDI Ciao, Martin
Very interesting website (note 'l' is missing from the 1st url). I wonder if it would be possible to use some variant of this as a replacement for things like the Midisport series of converters. Maybe use an arduino and translate the serial pins as 'real' MIDI then hooked up to the USB software. Would be quite convenient to not have to have a firmware downloader etc. -- Will J Godfrey
Aquí hi ha el codi i l'esquema (simple) de com connectar un xip AVR directament al USB, i el software per tal que l'ordinador el reconegui (el driver). Llest per compilar i per estudiar.
