Fix MassStorageKeyboard demo USE_INTERNAL_SERIAL check being performed before the required library headers were included, causing a compilation error.

Added notes to the class driver functions indicating which functions require what Device/Host state machine states to function.

1 files changed, 6 insertions, 0 deletions

diff --git a/LUFA/Drivers/USB/Class/Device/Audio.h b/LUFA/Drivers/USB/Class/Device/Audio.h
index fcfd65d72..e516b7101 100644
--- a/LUFA/Drivers/USB/Class/Device/Audio.h
+++ b/LUFA/Drivers/USB/Class/Device/Audio.h
@@ -123,6 +123,9 @@
 			/** Determines if the given audio interface is ready for a sample to be read from it, and selects the streaming

 			 *  OUT endpoint ready for reading.

 			 *

+			 *  \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or

+			 *        the call will fail.

+			 *

 			 *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state

 			 *

 			 *  \return Boolean true if the given Audio interface has a sample to be read, false otherwise

@@ -132,6 +135,9 @@
 			/** Determines if the given audio interface is ready to accept the next sample to be written to it, and selects

 			 *  the streaming IN endpoint ready for writing.

 			 *

+			 *  \note This function must only be called when the Device state machine is in the DEVICE_STATE_Configured state or

+			 *        the call will fail.

+			 *

 			 *  \param[in,out] AudioInterfaceInfo  Pointer to a structure containing an Audio Class configuration and state

 			 *

 			 *  \return Boolean true if the given Audio interface is ready to accept the next sample, false otherwise