RegFormat.txt

Axis and button mappings are kept in the registery. Driver will first search in
the registry key for the specific device; then in the driver's registry key.

The name of the registry entry will be "MapV1_xxx" where xxx is the hexdecimal
joystick device type the entry applies to. [There can be multiple device type
mappings in a single key.]

Each entry (type REG_BINARY) contains the following structure:
 <Header>
 NumberOfAxisDefs	byte
 NumberOfButtonDefs	byte
 NumberOfHats (0 to 2)	byte
 NumberOfConfigs	byte
 <HIDusages>
 Axis1_HID_Page		byte
 Axis1_HID_Usage	byte
 Axis2_HID_Page		byte
 Axis2_HID_Usage	byte
   ...
   ...
 AxisN_HID_Page		byte
 AxisN_HID_Usage	byte
 Button1_HID_Page	byte
 Button1_HID_Usage	byte
 Button2_HID_Page	byte
 Button2_HID_Usage	byte
   ...
   ...
 ButtonN_HID_Page	byte
 ButtonN_HID_Usage	byte
 Hat1_Page		byte
 Hat1_Usage		byte
 <ConfigSection(s)>
 Axis1_Source_Min	byte
 Axis1_Source_Max	byte
 Axis2_Source_Min	byte
 Axis2_Source_Max	byte
   ...
   ...
 AxisN_Source_Min	byte
 AxisN_Source_Max	byte
 Button1_Source		byte
 Button2_Source		byte
   ...
   ...
 ButtonN_Source		byte
 Hat1_Source_Up		byte
 Hat1_Source_Down	byte
 Hat1_Source_Left	byte
 Hat1_Source_Right	byte

*_Source fields are defined as follows:

 Bit7	Bit6	Bits5-0
  0     <7 bit index into button source array>
  1	0	<6 bit index into axis source array to use as axis value - normal sense>
  1	1	<6 bit index into axis source array to use as axis value - reversed sense>
  1     0	<6 bit index into axis source array - pressed if value less than half scale>
  1     1	<6 bit index into axis source array - pressed if value more than half scale>>

For axes with a min and max source, if the min source points to axis source the max source is ignored.
For hats if Source_up is analog and source_down is unused_field the analog is used as axis/axis_reversed
 If Source_up is digital or source_up is analog and source2 is not unused field, the analog fields are
 interpretend as digital (axis min/axis max) values instead of a single analog value.