usb keyboard

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usb mouse

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usb joystick

code char JoystickReportDesc[HID_REPORT_DESCRIPTOR_SIZE_JOYSTICK] = { 0x05, 0x01, //Usage Page(Generic Desktop) 0x09, 0x04, //Usage (Joystick) 0xA1, 0x01, //Collection (Application) 0x09, 0x01, //Usage (Pointer) 0xA1, 0x00, //Collection (Physical) 0x05, 0x01, //Usage Page(Generic Desktop) 0x09, 0x30, //Usage (X) 0x09, 0x31, //Usage (Y) 0x09, 0x32, //Usage (Z) 0x09, 0x35, //Usage (Rz) 0x15, 0x00, //Logical Minmum (0) 0x26, 0xFF, 0x00, //Logical Maxmum (255) 0x35, 0x00, //Physical Minmum (0) 0x46, 0xFF, 0x00, //Physical Maxmum (255) 0x65, 0x00, //Unit (0) 0x75, 0x08, //Report Size (8) 0x95, 0x04, //Report Count (4) 0x81, 0x02, //Input (Data, Variable, Absolute, No Wrap, Linear, Preferred State, No Null Position, Bitfileld) 0x09, 0x39, //Usage (Hat Switch) 0x15, 0x01, //Logical Minmum (1) 0x25, 0x08, //Logical Maxmum (8) 0x35, 0x00, //Physical Minmum (0) 0x46, 0x3B, 0x01,//Physical Maxmum (315) 0x65, 0x14, //Unit (20) 0x75, 0x08, //Report Size (8) 0x95, 0x01, //Report Count(1) 0x81, 0x02, //Input (Data, Variable, Absolute, No Wrap, Linear, Preferred State, No Null Position, Bitfileld) 0x05, 0x09, //Usage Page (Button) 0x19, 0x01, //Usage Minmum (1) 0x29, 0x0C, //Usage Maxmum (12) 0x15, 0x00, //Logical Minmum (0) 0x25, 0x01, //Logical Maxmum (1) 0x35, 0x00, //Physical Minmum (0) 0x45, 0x01, //Physical Maxmum (1) 0x75, 0x01, //Report Size (1) 0x95, 0x0C, //Report Count(12) 0x81, 0x02, //Input (Data, Variable, Absolute, No Wrap, Linear, Preferred State, No Null Position, Bitfileld) 0x75, 0x01, //Report Size (1) 0x95, 0x0C, //Report Count(12) 0x81, 0x01, //Input (Constant, Array, Absolute) 0xC0, // End Collection 0xC0 //End Collection };

上面这段report descriptor可以看出在usb endpoint上内容的字节组成 X，一个字节 Y，一个字节 Z，一个字节 Rz，一个字节 hat switch，一个字节 button，12bit constant填充，12bit

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参考文章

Parsing USB joystick HID data 2.