When you plug the device into your USB, Windows will look for the associated driver, if it cannot find this driver then you will be prompted to insert the driver disc that came with your device. Common USB Device errors are ‘ usb port not working ‘, ‘device descriptor request. When you plug the device into your USB, Windows will look for the associated driver, if it cannot find this driver then you will be prompted to insert the driver disc that came with your device. Common USB Device errors are ‘ usb port not working ‘, ‘device descriptor request failed error’ or ‘bugcodeusbdriver’ issues. Mar 27, 2018 You can do this in Device Manager, look for the serial port driver and use the configure options. You can change the assigned COM port and other things like the latency. NOTE: You won’t see the serial port in Device Manager unless the laptop is plugged in to the car. I hope that this post helps you to get the software working.
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7. Configuring MIDI devices.
MIDI devices can be integrated into the soundcard or be a separate device. External MIDI interfaces may be attached to either the serial or USB port.
The first *and most important* thing you should do is check if your card is supported!
Configuring MIDI devices varies with Linux distributions. A well supported card may be configured when you install the OS.
The Linux kernel includes the OSS drivers and in the 2.5 kernel the ALSA drivers. Most distributions provide a configuration tool (mostly for soundcards), but if you are using the MIDI port of a sound card it should be configured. Under RedHat you would use sndconfig, under SuSE yast, and Mandrake, DrakConf.
If none of the above tools will configure your MIDI interface, or you are experiencing problems, the following steps should be taken:
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Does lsmod show any MIDI related modules? Here's a typical output from an OSS based system.
Look for mpu401, olp3, uart401 and oss.
If you are using USB devices don't forget to check if the USB modules are there.
To check the config cat the sndstat file:
We see here that the MIDI device is a mad16 and this is listed in the lsmod output above.
If you see nothing related to MIDI check the contents of your /etc/modules.conf file.
Here's the output of /proc/modules to check to see if the MIDI modules are loaded into the Kernel.
You should see something similar to the above. If not you'll need to install MIDI drivers.
If you are going to be using ALSA 0.5x divers, which you shouldn't do, I suggest a good read of Valentijn Sessink's Alsa-sound-mini-HOWTO which can be found at the link below:
You are strongly recommended to use ALSA greater than version 0.9. For ALSA drivers later than 0.9x you should have a good read of the ALSA-HOWTO by Madhu Maddy.
7.1 ALSA 0.9 quick install
Below is a very quick install run-though for installing the ALSA 0.9 drivers and libs which is a required configuration for most MIDI apps.
Now you will need to edit /etc/modules.conf, or the ALSA file in your modules directory on some distributions. There may be entries for other, non-MIDI, devices, so be careful when you are editing the file.
A typical system may have old ALSA or OSS configurations in the file, you will need to remove, or better still comment them out.
Below is a typical modules.conf file showing the ALSA config with OSS.
Change the (MIDI/Sound card) entry to that of your card. This information can normally be found on the ALSA website.
With the ALSA drivers installed, now you will need to install the header library files needed by ALSA based programs. This is what is contained in the alsa-libs package.
Make sure you have a matching pair of alsa-drivers and alsa-libs!
Your system should now be configured :)
You can check this with a simple C program, if it compiles and can be executed then your system should be ok.
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7.2 Latency
MIDI is a real-time protocol and latency issues are a serious problem.
There are now several developers working on improving the latency times and improvements in the kernel are making Linux a fine platform for MIDI.
Although stock Linux distributions may run fine, pro set-ups should apply low-latency patches. More information can be found here:
Low Latency Mini Howto
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