Wiimote/Extension Controllers/uDraw GameTablet
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The uDraw GameTablet is a graphics tablet that can be identified by the six bytes FF 00 A4 20 01 12 at register address 0xA400FA after decryption.
The wired stylus has a pressure-sensitive nib and two buttons (named "lower" and "upper" in game manuals, "lower" is closest to the nib) under a single rocker piece.
Data Format
The uDraw GameTablet reports its information as 6 bytes of data, readable at 0xA40008 and streamable using Data Reporting Modes that include Extension bytes. The data is packed into the six bytes as follows (after decryption):
| Bit | ||||||||
| Byte | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 0 | X<7:0> | |||||||
| 1 | Y<7:0> | |||||||
| 2 | Y<11:8> | X<11:8> | ||||||
| 3 | PRESSURE<7:0> | |||||||
| 4 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 5 | 1 | 1 | 1 | 1 | 1 | BN | BL | BU |
The X and Y coordinates both read 0xFFF (4095) when the stylus is away from the tablet surface. The X coordinate ranges from around 80-1955 units (increasing from left to right) and the Y coordinate ranges from around 95-1450 (increasing from bottom to top) in testing though this likely varies from unit to unit.
Pressure varies from around 8 when the pen is off the tablet to 247 when fully pressed in. The pressure value is reported even when the pen is off the tablet surface.
BN is an active-high value that is 0 when the nib is released and 1 when the nib is pressed onto the surface of the tablet.
BL is the "lower" button and BU is the "upper" button, and both are active-low values that are 1 when their corresponding button is released and 0 when the button is pressed.