IRRST Shared Memory

This is the shared-memory for "ir:rst". The additional New 3DS HID data is stored here. The structure of this is similar to the HID_Shared_Memory sections.

The total size of this shared-mem is 0x98-bytes.

Offset 0x0

Relative offset	Size	Description
0x0	0x8	svcGetSystemTick tick-count output, for when IR module updates entry index0 in the below array.
0x8	0x8	Before the above tick-count field is updated, that value is copied into this field. Therefore, this contains the tick-count for the previous time that entry index0 in the below array was updated by IR module.
0x10	0x4	Index in the following array which was last updated by IR module.
0x18	0x80	Array of 8 entries, where each entry (see below) is 0x10-bytes.

IR module first updates index0, then index1, and so on. When updating the array when the index is already 7, the index is reset to 0.

Entry format

Relative offset	Size	Description
0x0	0x4	PAD state
0x4	0x4	PAD state for buttons which were pressed(bitmasks which changed from value 0 to value 1) since the last HID update.
0x8	0x4	PAD state for buttons which were released(bitmasks which changed from value 1 to value 0) since the last HID update.
0xC	0x2	C-stick X value (center is exactly 0, ranges from -0x9C to 0x9C)
0xE	0x2	C-stick Y value (center is exactly 0, ranges from -0x9C to 0x9C)

PAD State

Bit	Description
14	ZL
15	ZR
24	C-stick right
25	C-stick left
26	C-stick up
27	C-stick down

The ir:rst PAD entries are the same format as HID ones and meant to be ORd with them (they are complementary, there is no overlap in used bits).