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Fix HID mouse documentation

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The size of a mouse HID event is 4 bytes.
This commit is contained in:
Romain Vimont 2024-01-25 19:39:35 +01:00
parent 633f4fcd1d
commit e2b069b7c1
1 changed files with 5 additions and 3 deletions
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8
app/src/usb/hid_mouse.c
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@ -10,7 +10,8 @@
#define HID_MOUSE_ACCESSORY_ID 2
// 1 byte for buttons + padding, 1 byte for X position, 1 byte for Y position
// 1 byte for buttons + padding, 1 byte for X position, 1 byte for Y position,
// 1 byte for wheel motion
#define HID_MOUSE_EVENT_SIZE 4
/**
@ -90,11 +91,12 @@ static const unsigned char mouse_report_desc[] = {
};
/**
* A mouse HID event is 3 bytes long:
* A mouse HID event is 4 bytes long:
*
* - byte 0: buttons state
* - byte 1: relative x motion (signed byte from -127 to 127)
* - byte 2: relative y motion (signed byte from -127 to 127)
* - byte 3: wheel motion (-1, 0 or 1)
*
* 7 6 5 4 3 2 1 0
* +---------------+
@ -112,7 +114,7 @@ static const unsigned char mouse_report_desc[] = {
* +---------------+
* byte 2: |. . . . . . . .| relative y motion
* +---------------+
* byte 3: |. . . . . . . .| wheel motion (-1, 0 or 1)
* byte 3: |. . . . . . . .| wheel motion
* +---------------+
*
* As an example, here is the report for a motion of (x=5, y=-4) with left