105 lines
3.3 KiB
Plaintext
105 lines
3.3 KiB
Plaintext
tranzport 0.1 <tranzport.sf.net>
|
|
oct 18, 2005
|
|
arthur@artcmusic.com
|
|
---
|
|
|
|
The Frontier Design Tranzport(tm) (www.frontierdesign.com) is a simple
|
|
wireless USB device. It is not a MIDI device. The document on their web
|
|
site "Tranzport(tm) Native Mode Interface Description" describes the
|
|
Tranzport(tm) as if it were a MIDI device, but this is implemented by their
|
|
Windows and Macintosh software drivers.
|
|
|
|
This code will allow you to use your Tranzport(tm) at a lower level of
|
|
abstraction. This code relies on libusb, which can be obtained from
|
|
libusb.sourceforge.net.
|
|
|
|
To compile the program, type "make". You should end up with a executable
|
|
called "tranzport". You'll probably have to run this program as root.
|
|
|
|
Using the program is straightforward. It will simply tell you which
|
|
buttons are being pressed and what not. If you press one of the buttons
|
|
with a light, the light will turn on. If you hold shift and press one of
|
|
the buttons with a light, the light will turn off. If you take out the
|
|
batteries to the device (or go out of range), it will tell you that the
|
|
device is offline. When you replace the batteries (or come back in
|
|
range), it should tell you it is back online.
|
|
|
|
Once you understand how everything works, you should be able to
|
|
incorporate it into your own setup however you wish.
|
|
|
|
This code was developed on a Linux machine, but (theoretically) it
|
|
should work on any system that is supported by libusb, since that is how
|
|
it communicates with the device.
|
|
|
|
Here are a few more details about the device:
|
|
|
|
There are two endpoints for communication with the device. All data
|
|
reads and writes are done in 8-byte segments.
|
|
|
|
One endpoint is for interrupt reads. This is used to read button data
|
|
from the device. It also supplies status information for when the device
|
|
goes out of range and comes back in range, loses power and regains
|
|
power, etc. The format of the data is:
|
|
|
|
00 ss bb bb bb bb dd 00 (hexadecimal)
|
|
|
|
where:
|
|
|
|
ss - status code, 01=online ff=offline
|
|
bb - button bits
|
|
dd - data wheel, 01-3f=forward 41-7f=backward
|
|
|
|
Please refer to the source code for a list of the button bits.
|
|
|
|
The other endpoint is for interrupt writes. This is used to toggle the
|
|
lights on the device, and to write data to the LCD.
|
|
|
|
There are 7 lights on the device. To turn a light on, send the following
|
|
sequence of bytes:
|
|
|
|
00 00 nn 01 00 00 00 00 (hexadecimal)
|
|
|
|
where nn is the light number.
|
|
|
|
To turn a light off:
|
|
|
|
00 00 nn 00 00 00 00 00 (hexadecimal)
|
|
|
|
Here is the list of lights:
|
|
|
|
00 Record
|
|
01 Track Rec
|
|
02 Track Mute
|
|
03 Track Solo
|
|
04 Any Solo
|
|
05 Loop
|
|
06 Punch
|
|
|
|
The size of the LCD is 20x2, and it is split into 10 cells, each cell
|
|
being 4 characters wide. The cells progress across, then down. To write
|
|
to the LCD, send the following sequence of bytes:
|
|
|
|
00 01 cc aa aa aa aa 00 (hexadecimal)
|
|
|
|
where:
|
|
|
|
cc - cell number
|
|
aa - ASCII code
|
|
|
|
Here is a list of the cells to clarify:
|
|
|
|
00 row 0, column 0-3
|
|
01 row 0, column 4-7
|
|
02 row 0, column 8-11
|
|
03 row 0, column 12-15
|
|
04 row 0, column 16-19
|
|
05 row 1, column 0-3
|
|
06 row 1, column 4-7
|
|
07 row 1, column 8-11
|
|
08 row 1, column 12-15
|
|
09 row 1, column 16-19
|
|
|
|
You should refer to the "Tranzport(tm) Native Mode Interface
|
|
Description" document for a listing of the ASCII codes the LCD uses.
|
|
|