El Vie 02 Ago 2002 21:03, Patrick Shirkey escribió:
> Hey.
>
> I am just about ready to release the new alsa docs to the general public .
>
> Can you guys tell me what the differences are in installing the card
> compared to the standard template. thx.
>
> http://www.alsa-project.org/alsa-doc/
>
> (just open up a couple of pages and you should see what I mean).
First, I need to say that perhaps I'm not the best source of information, as
I've been here, or as an ALSA user for a short time, and because my poor
english. So please, if I'm wrong on something let me know and correct my
mistakes.
I suppose that you want to know about the MIDI only devices, and specifically
the Midiman MidisportNxN.
MIDI only devices (without digital audio) are not new. The first I had, a long
time ago, was a Roland MPU-401. And as the newer ones, it had only MIDI
ports, not digital audio, nor mixer. As a general rule, a template for these
devices (kmod / modules.conf section) can be something like this:
# ALSA portion
alias char-major-116 snd
alias snd-card-0 snd-usb-midi
# module options should go here
# OSS/Free portion
alias char-major-14 soundcore
alias sound-slot-0 snd-card-0
# card #1
alias sound-service-0-1 snd-seq-oss
alias sound-service-0-8 snd-seq-oss
Also, there is not need to mention alsamixer nor snd-pcm-oss, snd-mixer-oss
or some other audio only program. Volume and other sound parameters are
usually embedded inside the MIDI stream.
About the .asoundrc file, I think that it has nothing to do with these
devices, but perhaps I'm wrong and it has some useful function for MIDI.
There are a few devices supposed to work with snd-usb-midi driver that have
also an Audio function, though, as the Roland/Edirol SC-8820 and SC-8850. In
this case, the audio portion of that devices need the snd-usb-audio driver.
You can put both buttons in the driver column for these devices as they need
two drivers simultaneously.
As a side note, the name "card" is not very appropiate in the USB land. They
are all external devices, (MIDI adaptors, keyboards, drum controllers and
surely soon guitars, wind controllers, etc.), connected by the USB cable to
the computer or USB hub. Another surprising issue is that in the ALSA
soundcard matrix there is no one Roland/Edirol device. The snd-usb-driver
works with a couple of MIDI adapters and synthesizers from Roland, as you
can see at Clemens page:
http://www.informatik.uni-halle.de/~ladischc/usbmidid.html
We have also a report from Martin Langer, that his MK-249C USB MIDI keyboard
from Evolution Electronics Ltd. works with the snd-usb-midi driver.
http://www.evolution.co.uk/products/keyboards_01.htm
Finally, some points about the Midiman MidisportNxN. For the "chipset" column,
you can mention here "ezusb" (or better, "Cypress AN2131", see:
http://www.cypress.com/products/datasheet.cfm?partnum=AN2131SC for technical
reference manuals and developement kits). This chipset is widely used in USB
peripherals, not only MIDI ones, and it is related to Intel 8051 chip.
As an example, I know that Midiman has some USB MIDI keyboards using ezusb,
that perhaps can work with snd-usb-midi.
USB Keystations: http://www.midiman.net/products/midiman/keystations.php
Steinberg has also a ezusb compatible USB MIDI Adaptor:
http://www.harmony-central.com/Newp/1999/USB-2-MIDI-Interface.html
As some other devices built around the ezusb circuits, the MidisportNxN
devices need a firmware program to be loaded from the host thru the USB
cable. Midiman did not released his firmware for Linux, but we are using a
nice GPL one, by Lars Doelle, that can be obtained from:
http://member.nifty.ne.jp/Breeze/softwares/unix/bin/usbmidi-20020324.tar.gz
Inside the tarball, there is a testing/Midisport directory with sources,
documents and two files: ezusbmidi1x1.ihx and ezusbmidi2x2.ihx
These are the precompiled firmware programs for Midisport1x1 and 2x2. For 4x4
and 8x8, you can put a "coming soon" advice :), as they had not yet been
released.
A good place to put the ezusbmidiNxN.ihx files is the
/usr/share/usb/ezusbmidi/ directory, according to the Linux Standard Base.
But you can put it elsewhere, fixing the appropiate scripts.
To load the firmware into the device, the Linux-hotplug utility 'fxload' can
be used. The best way to do so is letting hotplug to take care of that, but
first, you need to install hotplug, and edit some files (as root).
# pico /etc/hotplug/usb.usermap
ezusbmidi 0x0003 0x0763 0x1010 0 0 0 0 0 0 0 0 0
ezusbmidi 0x0003 0x0763 0x1001 0 0 0 0 0 0 0 0 0
ezusbmidi 0x0003 0x0763 0x1020 0 0 0 0 0 0 0 0 0
ezusbmidi 0x0003 0x0763 0x1030 0 0 0 0 0 0 0 0 0
# pico /etc/hotplug/usb/ezusbmidi
#!/bin/sh
FIRMWARE=
FLAGS=
LOADER=/sbin/fxload
# pre-renumeration device IDs
case $PRODUCT in
# Midisport 1x1
763/1010/*)
FIRMWARE=/usr/share/usb/ezusbmidi/ezusbmidi1x1.ihx
;;
# Midisport 2x2
763/1001/*)
FIRMWARE=/usr/share/usb/ezusbmidi/ezusbmidi2x2.ihx
;;
esac
# quit unless we were called to download some firmware
if [ "$FIRMWARE" = "" ]; then
if [ -x /usr/bin/logger ]; then
/usr/bin/logger -t $0 "there is not a firmware for $PRODUCT ??"
fi
exit 1
fi
# missing firmware?
if [ ! -r $FIRMWARE ]; then
if [ -x /usr/bin/logger ]; then
/usr/bin/logger -t $0 "missing $FIRMWARE for $PRODUCT ??"
fi
exit 1
fi
# missing loader?
if [ ! -x $LOADER ]; then
if [ -x /usr/bin/logger ]; then
/usr/bin/logger -t $0 "missing $LOADER ??"
fi
exit 1
fi
if [ -x /usr/bin/logger ]; then
/usr/bin/logger -t $0 "load $FIRMWARE for $PRODUCT to $DEVICE"
fi
$LOADER $FLAGS -I $FIRMWARE
Regards,
Pedro
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