QNX Technical Articles

Date of this edition: October 17, 2007

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Contents

• What's in this patch?
• Known issues
• Technical support

Throughout this document, you may see reference numbers associated with particular issues, changes, etc. When corresponding with our Technical Support staff about a given issue, please quote the relevant reference number. You might also find the reference numbers useful for tracking issues as they become fixed.

What's in this patch?

This patch provides support for the following touchscreens:

• Egalax: Resistive Controllers (4/5/8 wire)
• ELO: All USB ELO controllers
• Microtouch: SC-400, SC-500, SC-800 Series
• Touch International: DMC TSC-10

The patch contains updates to the following binaries:

• /bin/devu-elo
• /bin/devu-microtouch
• /bin/devu-touchintl
• /bin/devu-egalax
• /bin/Input

Starting the drivers

To start the drivers, run the Input driver using the generic module. For example:

# devu-elo &
# Input generic fd -d/dev/elousb0 &

Generic interface for non-serial/PS2 touchscreens

The Input driver has a new module that uses a generic packet format that lets you implement your own drivers if needed. The external driver must use the following protocol in order for the generic driver to function correctly.

The default number of bits for each coordinate is 14, but you can use the -B command-line option to change it. If you don't use all 14 bits, make certain that the values that aren't used are set to 0.

                  MSB             Bits               LSB
  Data Sequence    7    6    5    4    3    2    1    0
  ------------------------------------------------------
  S-Byte 1         1    S6   XXXXXXXXX Reserved XXXXXXXX
  X-Byte 2         0    X6   X5   X4   X3   X2   X1   X0
  x-Byte 3         0    X13  X12  X11  X10  X9   X8   X7
  Y-Byte 4         0    Y6   Y5   Y4   Y3   Y2   Y1   Y0
  y-Byte 5         0    Y13  Y12  Y11  Y10  Y9   Y8   Y7
  ------------------------------------------------------

S0-S5

Reserved.

S6

Proximity:

• 1 = Touchscreen is being touched (a touchdown or a continued touch).
• 0 = Touchscreen isn't being touched (a touch liftoff or inactive).

S7

Packet synchronization; always 1.

Known issues

• You need to calibrate Microtouch touchscreens on Microsoft Windows first, in order to calibrate the hardware.

Technical support

If you have any questions, comments, or problems with a QNX product, please contact Technical Support. For more information, visit our website, www.qnx.com.