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@@ -252,7 +252,9 @@ struct usb_hid_descriptor_##p { \
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#define HID_RI_PHYSICAL_MINIMUM(DataBits, ...) _HID_RI_ENTRY(HID_RI_TYPE_GLOBAL, 0x30, DataBits, __VA_ARGS__)
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/** Defines a maximum value for the physical extent of a variable item */
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#define HID_RI_PHYSICAL_MAXIMUM(DataBits, ...) _HID_RI_ENTRY(HID_RI_TYPE_GLOBAL, 0x40, DataBits, __VA_ARGS__)
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-/** Value of the unit exponent in base 10. */
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+/** Value of the unit exponent in base 10.
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+ * \note The USB-HID specification is unclear about Unit exponent usage. Practically it's limited by 1 nibble.
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+*/
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#define HID_RI_UNIT_EXPONENT(DataBits, ...) _HID_RI_ENTRY(HID_RI_TYPE_GLOBAL, 0x50, DataBits, __VA_ARGS__)
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/** Encoded unit value \see \ref HID_UNITS_ENCODE */
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#define HID_RI_UNIT(DataBits, ...) _HID_RI_ENTRY(HID_RI_TYPE_GLOBAL, 0x60, DataBits, __VA_ARGS__)
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@@ -318,8 +320,8 @@ struct usb_hid_descriptor_##p { \
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* \anchor HID_UNITS_ENCODE */
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//@{
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#define HID_UNIT_NONE 0x00 /**<No system. */
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-#define HID_UNIT_CGS_LINEAR 0x01 /**<Centimeter-Gram-Second metric linear system.*/
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-#define HID_UNIT_CGS_ROTATION 0x02 /**<Centimeter-Gram-Second metric rotation system.*/
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+#define HID_UNIT_CGS_LINEAR 0x01 /**<Centimeter-Gram-Second metric linear system. \note USB-HID defines this as SI linear.*/
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+#define HID_UNIT_CGS_ROTATION 0x02 /**<Centimeter-Gram-Second metric rotation system. \note USB-HID defines this as SI rotation.*/
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#define HID_UNIT_IMPERIAL_LINEAR 0x03 /**<Imperial linear system.*/
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#define HID_UNIT_IMPERIAL_ROTATION 0x04 /**<Imperial rotation system.*/
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#define HID_UNIT_LENGTH(exp) ((exp & 0x0F) << 4) /**<Length, position, distance unit. cm (CGS), inch (Imperial) */
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