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| author | Dean Camera <dean@fourwalledcubicle.com> | 2009-09-01 11:16:57 +0000 |
|---|---|---|
| committer | Dean Camera <dean@fourwalledcubicle.com> | 2009-09-01 11:16:57 +0000 |
| commit | bda4bd45016714e892252fc7aaee88f6d20af231 (patch) | |
| tree | fb18c93b895a62066f349cfae7a6f87427556dba /Demos/Device/ClassDriver/MassStorage/Descriptors.c | |
| parent | dac7b046fd5d5c5332ca82cd538dd2c50f9128fd (diff) | |
| download | lufa-bda4bd45016714e892252fc7aaee88f6d20af231.tar.gz lufa-bda4bd45016714e892252fc7aaee88f6d20af231.tar.bz2 lufa-bda4bd45016714e892252fc7aaee88f6d20af231.zip | |
Move check for devices not supporting internal serials in demos which make use of USE_INTERNAL_SERIAL to Descriptors.c from Descriptors.h so that the warning is only generated at most once per compilation.
Diffstat (limited to 'Demos/Device/ClassDriver/MassStorage/Descriptors.c')
| -rw-r--r-- | Demos/Device/ClassDriver/MassStorage/Descriptors.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Demos/Device/ClassDriver/MassStorage/Descriptors.c b/Demos/Device/ClassDriver/MassStorage/Descriptors.c index b82492386..4dcc4bb26 100644 --- a/Demos/Device/ClassDriver/MassStorage/Descriptors.c +++ b/Demos/Device/ClassDriver/MassStorage/Descriptors.c @@ -37,6 +37,18 @@ #include "Descriptors.h"
+/* On some devices, there is a factory set internal serial number which can be automatically sent to the host as
+ * the device's serial number when the Device Descriptor's .SerialNumStrIndex entry is set to USE_INTERNAL_SERIAL.
+ * This allows the host to track a device across insertions on different ports, allowing them to retain allocated
+ * resources like COM port numbers and drivers. On demos using this feature, give a warning on unsupported devices
+ * so that the user can supply their own serial number descriptor instead or remove the USE_INTERNAL_SERIAL value
+ * from the Device Descriptor (forcing the host to generate a serial number for each device from the VID, PID and
+ * port location).
+ */
+#if (USE_INTERNAL_SERIAL == NO_DESCRIPTOR)
+ #warning USE_INTERNAL_SERIAL is not available on this AVR - please manually construct a device serial descriptor.
+#endif
+
/** Device descriptor structure. This descriptor, located in FLASH memory, describes the overall
* device characteristics, including the supported USB version, control endpoint size and the
* number of device configurations. The descriptor is read out by the USB host when the enumeration
|