Paul Davis
449aab3c46
git-svn-id: svn://localhost/ardour2/branches/3.0@3435 d708f5d6-7413-0410-9779-e7cbd77b26cf
105 lines
3.3 KiB
Plaintext
105 lines
3.3 KiB
Plaintext
tranzport 0.1 <tranzport.sf.net>
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oct 18, 2005
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arthur@artcmusic.com
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---
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The Frontier Design Tranzport(tm) (www.frontierdesign.com) is a simple
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wireless USB device. It is not a MIDI device. The document on their web
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site "Tranzport(tm) Native Mode Interface Description" describes the
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Tranzport(tm) as if it were a MIDI device, but this is implemented by their
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Windows and Macintosh software drivers.
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This code will allow you to use your Tranzport(tm) at a lower level of
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abstraction. This code relies on libusb, which can be obtained from
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libusb.sourceforge.net.
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To compile the program, type "make". You should end up with a executable
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called "tranzport". You'll probably have to run this program as root.
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Using the program is straightforward. It will simply tell you which
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buttons are being pressed and what not. If you press one of the buttons
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with a light, the light will turn on. If you hold shift and press one of
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the buttons with a light, the light will turn off. If you take out the
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batteries to the device (or go out of range), it will tell you that the
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device is offline. When you replace the batteries (or come back in
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range), it should tell you it is back online.
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Once you understand how everything works, you should be able to
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incorporate it into your own setup however you wish.
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This code was developed on a Linux machine, but (theoretically) it
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should work on any system that is supported by libusb, since that is how
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it communicates with the device.
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Here are a few more details about the device:
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There are two endpoints for communication with the device. All data
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reads and writes are done in 8-byte segments.
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One endpoint is for interrupt reads. This is used to read button data
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from the device. It also supplies status information for when the device
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goes out of range and comes back in range, loses power and regains
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power, etc. The format of the data is:
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00 ss bb bb bb bb dd 00 (hexadecimal)
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where:
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ss - status code, 01=online ff=offline
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bb - button bits
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dd - data wheel, 01-3f=forward 41-7f=backward
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Please refer to the source code for a list of the button bits.
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The other endpoint is for interrupt writes. This is used to toggle the
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lights on the device, and to write data to the LCD.
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There are 7 lights on the device. To turn a light on, send the following
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sequence of bytes:
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00 00 nn 01 00 00 00 00 (hexadecimal)
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where nn is the light number.
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To turn a light off:
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00 00 nn 00 00 00 00 00 (hexadecimal)
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Here is the list of lights:
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00 Record
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01 Track Rec
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02 Track Mute
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03 Track Solo
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04 Any Solo
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05 Loop
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06 Punch
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The size of the LCD is 20x2, and it is split into 10 cells, each cell
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being 4 characters wide. The cells progress across, then down. To write
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to the LCD, send the following sequence of bytes:
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00 01 cc aa aa aa aa 00 (hexadecimal)
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where:
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cc - cell number
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aa - ASCII code
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Here is a list of the cells to clarify:
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00 row 0, column 0-3
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01 row 0, column 4-7
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02 row 0, column 8-11
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03 row 0, column 12-15
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04 row 0, column 16-19
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05 row 1, column 0-3
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06 row 1, column 4-7
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07 row 1, column 8-11
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08 row 1, column 12-15
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09 row 1, column 16-19
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You should refer to the "Tranzport(tm) Native Mode Interface
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Description" document for a listing of the ASCII codes the LCD uses.
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