Re: [Alsa-user] snd-serialmidi / snd-serial-u16550 ??

[Clemens L. <cl...@la...>]

rossen wrote:
> I have Yamaha CS1X which has "to host" interface that output midi
> to a serial port. [...]
> Also, what is the difference between snd-serialmidi and snd-serial-u16550 ?

There are two ways of using a serial port for MIDI:

1) Load the standard Linux serial driver for the port, and use the
   snd-serialmidi driver, specifying the name of the device file with
   the sdev parameter. You should set the correct speed, too (if it
   isn't the default value 38400).

   modprobe snd-serialmidi sdev=/dev/tty... speed=...

2) Do _not_ load the standard serial driver for the port, and use the
   snd-serial-u16550 driver. This driver accesses the hardware
   directly, so you have to set the port, irq (and maybe speed)
   parameters.

   modprobe snd-serial-u16550 port=... irq=... speed=...

   (usually, COM1 is 0x3f8/4, and COM2 is 0x2f8/3)

In both cases, you have to know which port your MIDI device is
connected to.

Please note that the module options do not have a "snd_" prefix
anymore.


HTH
Clemens