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.

git-svn-id: http://lufa-lib.googlecode.com/svn/trunk@802 d5102386-fcda-11dd-9fdb-3debd5008f28

1 files changed, 12 insertions, 0 deletions

diff --git a/Demos/Device/ClassDriver/MassStorage/Descriptors.c b/Demos/Device/ClassDriver/MassStorage/Descriptors.c
index b8249238..4dcc4bb2 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