HID Shared Memory
This page describes the format of the HID shared memory.
The data for each of the below entries(PAD state, circle-pad, touch-screen, etc) is originally written by the HID module at different times per frame.
size: 0x2b0 (FIRM 4.4)
Offset 0x0
| Relative offset | Size | Description |
|---|---|---|
| 0x0 | 0x8 | svcGetSystemTick tick-count output, for when HID 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 HID module. |
| 0x10 | 0x4 | Index in the following array which was last updated by HID module. |
| 0x1C | 0x4 | PAD state. Bit set = button pressed, bit clear = button not pressed. Bit28-31 do not apply to this entry, but they apply to further PAD state entries. Bit28-31 are set when the corresponding circle pad coordinate is >=41 (or <=-41). |
| 0x28 | 0x80 | Array of 8 entries, where each entry(see below) is 0x10-bytes. |
HID 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 | ? |
| 0x8 | 0x4 | ? |
| 0xC | 0x4 | This stores circle-pad info: the low s16 is the X coordinate, the high s16 is the Y coordinate. The circle-pad center is approximately 0 for these fields. The range for these fields is approximately: -0x9C(bottom/left) - 0x9C(top/right). |
Offset 0xA8
| Relative offset | Size | Description |
|---|---|---|
| 0x0 | 0x8 | svcGetSystemTick tick-count output, for when HID 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 HID module. |
| 0x10 | 0x4 | Index in the following array which was last updated by HID module. |
| 0x18 | 0x8 | Touch-screen entry, which contains the raw coordinate data prior to being converted to pixel coordinates. |
| 0x20 | 0x40 | 8 Touch-screen entries, containing pixel coordinates. |
This 0x60-byte region stores state for touch-screen related info. Each touch-screen entry is all-zero when the touch-screen is not being touched.
HID 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 | 0x2 | X coordinate. |
| 0x2 | 0x2 | Y coordinate. |
| 0x4 | 0x4 | The u8 at +0 here is 0x0 when this entry doesn't contain any actual data, value 0x1 indicates that this entry contains actual data. |
Offset 0x108
The size of this region is 0x50-bytes. This contains the accelerometer state.
Offset 0x158
The size of this region is 0xE0-bytes. Initially this contains 0xFF/0x00 bytes. This contains the gyroscope state.
Offset 0x238
The size of this region is 0x78-bytes. Initially this contains 0xFF/0x00 bytes.