HID Shared Memory

This page describes the format of the HID shared memory.

Offset 0x0

Relative offset	Description
0x1C	PAD state. Bit set = button pressed, bit clear = button not pressed.
0x28	Same as 0x1C?
0x34	This stores circle-pad info: the low s16 is the X coordinate, the high s16 is the Y coordinate.
0x38	Same as 0x1C?
0x44	Same as 0x34?
0x48	Same as 0x1C?
0x54	Same as 0x34?
0x58	Same as 0x1C?
0x64	Same as 0x34?
0x68	Same as 0x1C?
0x74	Same as 0x34?
0x78	Same as 0x1C?
0x84	Same as 0x34?
0x88	Same as 0x1C?
0x94	Same as 0x34?
0x98	Same as 0x1C?

Offset 0xC0

This 0x48-byte region stores entries for touch-screen position info. Each entry is 0x8-bytes, there's a total of 9 entries. Normally the last 8 entries contain the same data. When the touch-screen is not being touched, this region is all-zero.

The last 8 entries contain the pixel coordinates, while the first entry seems to contain the raw coordinate data prior to being converted to pixel coordinates.

Entry format

Relative offset	Size	Description
0x0	0x2	X coordinate.
0x2	0x2	Y coordinate.
0x4	0x4	This is 0x0 when this entry doesn't contain any actual data, value 0x1 indicates that this entry contains actual data.