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Chapter 3 — Configuring the Computer

CK60 Mobile Computer with Windows CE User’s Manual 51

Implementation

The CK60 keypad virtual key mappings are controlled by registry entries

read each time the keypad driver loads. You can “remap” the keypad after it

has loaded by modifying the registry entries and then sending a signal to

the keypad driver to re-read the registry mappings. The keypad driver uses

the scan code values returned by the keypad device as an index into these

registry entries to determine the virtual key value sent to the system.

Registry Entries

There are three main “shift plane” registry entries which map the keypad

device scancodes to the windows virtual key values. Each registry entry is an

array of 128 WORDs (2 byte unsigned int, little endian). Since scan codes

generated by the keypad device can range in value from 0x00 to 0x7f, the

driver uses the generated scan code value as an index into one of the shift

plane entries to determine the virtual key value sent up to the system.

The shift plane registry entry used is determined by the current state of the

Orange and Green keys. If the Orange key is held down, then the “Orange

shift plane” array is used. If the Green key is held down, then the “Green

shift plane” array is used. If neither Orange nor Green key is held down,

then the “Normal, unshifted plane” array is used.

The name of the three registry entries that define the Normal, Orange, and

Green shift planes are:

HKLM\HARDWARE\DEVICEMAP\KEYBD\xxxx\Vkey (Normal)

HKLM\HARDWARE\DEVICEMAP\KEYBD\xxxx\VkeyGold (Orange)

HKLM\HARDWARE\DEVICEMAP\KEYBD\xxxx\VkeyAlpha (Green)

Where xxxx is a four-digit keypad ID which identifies the type of keypad

on your CK60.

These are the registry entries (which are arrays of 128 WORDs) you need

to modify to remap your keypad.

Programming the Keypad

Do the following to change a single key on the CK60 keypad. You can

change more than one key, if desired.

1 Identify your keypad

Read the four bytes of text stored in the registry entry. For this example,

this value is referred to as <KPID>.

HKEY_LOCAL_MACHINE\Drivers\BuiltIn\KEYPAD\ActiveConfig

2 Read the shift plane mapping

Read each of these key values into a WORD array of size 128. Note that

not all keypads have entries for VkeyGold and VkeyAlpha.

HKLM\HARDWARE\DEVICEMAP\KEYBD\<KPID>\Vkey (Normal)

HKLM\HARDWARE\DEVICEMAP\KEYBD\<KPID>\VkeyGold (Orange)

HKLM\HARDWARE\DEVICEMAP\KEYBD\<KPID>\VkeyAlpha (Green)

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