diff options
Diffstat (limited to 'LUFA/Drivers/USB/HighLevel/StdDescriptors.h')
| -rw-r--r-- | LUFA/Drivers/USB/HighLevel/StdDescriptors.h | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/LUFA/Drivers/USB/HighLevel/StdDescriptors.h b/LUFA/Drivers/USB/HighLevel/StdDescriptors.h index 2ce75b2d9..274b84fc4 100644 --- a/LUFA/Drivers/USB/HighLevel/StdDescriptors.h +++ b/LUFA/Drivers/USB/HighLevel/StdDescriptors.h @@ -74,6 +74,21 @@ * descriptor does not exist.
*/
#define NO_DESCRIPTOR 0
+
+ #if (!defined(NO_INTERNAL_SERIAL) && (defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR))) || defined(__DOXYGEN__)
+ /** String descriptor index for the device's unique serial number string descriptor within the device.
+ * This unique serial number is used by the host to associate resources to the device (such as drivers or COM port
+ * number allocations) to a device regardless of the port it is plugged in to on the host. Some USB AVRs contain
+ * a unique serial number internally, and setting the device descriptors serial number string index to this value
+ * will cause it to use the internal serial number.
+ *
+ * On unsupported devices, this will evaluate to NO_DESCRIPTOR and so will force the host to create a pseduo-serial
+ * number for the device.
+ */
+ #define USE_INTERNAL_SERIAL 0xDC
+ #else
+ #define USE_INTERNAL_SERIAL NO_DESCRIPTOR
+ #endif
/** Macro to calculate the power value for the device descriptor, from a given number of milliamps. */
#define USB_CONFIG_POWER_MA(mA) (mA >> 1)
@@ -244,13 +259,14 @@ */
uint8_t SerialNumStrIndex; /**< String index for the product's globally unique hexadecimal
* serial number, in uppercase Unicode ASCII.
- *
- * \note On some AVR models, there is an embedded serial number
- * in the chip which can be used for the device serial number.
- * To use this serial number, define USE_INTERNAL_SERIAL to a
- * unique string index number in the project makefile and set
- * this value to USE_INTERNAL_SERIAL.
- *
+ *
+ * \note On some AVR models, there is an embedded serial number
+ * in the chip which can be used for the device serial number.
+ * To use this serial number, set this to USE_INTERNAL_SERIAL.
+ * On unsupported devices, this will evaluate to 0 and will cause
+ * the host to generate a pseudo-unique value for the device upon
+ * insertion.
+ *
* \see ManufacturerStrIndex structure entry.
*/
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