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This commit is contained in:
Romain Vimont 2021-12-30 14:46:23 +01:00
parent 28915784ce
commit cc072c65d7
1 changed files with 15 additions and 4 deletions
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19
app/src/hid_mouse.c
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@ -11,13 +11,17 @@
#define HID_MOUSE_ACCESSORY_ID 2
// 1 byte for buttons + padding, 1 byte for X position, 1 byte for Y position
#define HID_MOUSE_EVENT_SIZE 3
#define HID_MOUSE_EVENT_SIZE 4
/**
* Mouse descriptor from the specification:
* <https://www.usb.org/sites/default/files/hid1_11.pdf>
*
* Appendix E (p71): §E.10 Report Descriptor (Mouse)
*
* The usage tags (like Wheel) are listed in "HID Usage Tables":
* <https://www.usb.org/sites/default/files/documents/hut1_12v2.pdf>
* §4 Generic Desktop Page (0x01) (p26)
*/
static const unsigned char mouse_report_desc[] = {
// Usage Page (Generic Desktop)
@ -65,15 +69,17 @@ static const unsigned char mouse_report_desc[] = {
0x09, 0x30,
// Usage (Y)
0x09, 0x31,
// Usage (Wheel)
0x09, 0x38,
// Local Minimum (-127)
0x15, 0x81,
// Local Maximum (127)
0x25, 0x7F,
// Report Size (8)
0x75, 0x08,
// Report Count (2)
0x95, 0x02,
// Input (Data, Variable, Relative): 2 position bytes (X & Y)
// Report Count (3)
0x95, 0x03,
// Input (Data, Variable, Relative): 3 position bytes (X, Y, Wheel)
0x81, 0x06,
// End Collection
@ -104,6 +110,8 @@ static const unsigned char mouse_report_desc[] = {
* +---------------+
* byte 2: |. . . . . . . .| relative y motion
* +---------------+
* byte 3: |. . . . . . . .| wheel motion (-1, 0 or 1)
* +---------------+
*
* As an example, here is the report for a motion of (x=5, y=-4) with left
* button pressed:
@ -115,6 +123,8 @@ static const unsigned char mouse_report_desc[] = {
* +---------------+
* |1 1 1 1 1 1 0 0| relative y motion (y = -4)
* +---------------+
* |0 0 0 0 0 0 0 0| wheel motion
* +---------------+
*/
static bool
@ -159,6 +169,7 @@ convert_hid_mouse_motion(struct sc_hid_mouse *mouse,
buffer[0] = buttons_state_to_hid_buttons(event->buttons_state);
buffer[1] = CLAMP(event->xrel, -127, 127);
buffer[2] = CLAMP(event->yrel, -127, 127);
buffer[3] = 0; // wheel coordinate only used for scrolling
return true;
}