Minor documentation improvements.

LUFA/Drivers/USB/USB.h

@@ -158,8 +158,8 @@
  *  before the class driver is used. Each Device mode Class driver typically contains a set of configuration parameters
  *  for the endpoint size/number of the associated logical USB interface, plus any class-specific configuration parameters.
  *
- *  The \c State section of the \c USB_ClassInfo_* structures are designed to be controlled by the Class Drivers only for
- *  maintaining the Class Driver instance's state, and should not normally be set by the user application.
+ *  \note The \c State section of the \c USB_ClassInfo_* structures are designed to be controlled by the Class Drivers only
+ *        for maintaining the Class Driver instance's state, and should not normally be altered by the user application.
  *
  *  The following is an example of a properly initialized instance of the Audio Class Driver structure:
  *
@@ -188,10 +188,10 @@
  *  \code
  *  void EVENT_USB_Device_ConfigurationChanged(void)
  *  {
- *  	LEDs_SetAllLEDs(LEDMASK_USB_READY);
+ *      LEDs_SetAllLEDs(LEDMASK_USB_READY);
  *
- *  	if (!(Audio_Device_ConfigureEndpoints(&My_Audio_Interface)))
- *  	  LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+ *      if (!(Audio_Device_ConfigureEndpoints(&My_Audio_Interface)))
+ *          LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
  *  }
  *  \endcode
  *
@@ -210,7 +210,8 @@
  *
  *      for (;;)
  *      {
- *          Create_And_Process_Samples();
+ *          if (USB_DeviceState != DEVICE_STATE_Configured)
+ *            Create_And_Process_Samples();
  *
  *          Audio_Device_USBTask(&My_Audio_Interface);
  *          USB_USBTask();
@@ -257,10 +258,10 @@
  *  before the class driver is used. Each Device mode Class driver typically contains a set of configuration parameters
  *  for the endpoint size/number of the associated logical USB interface, plus any class-specific configuration parameters.
  *
- *  The \c State section of the \c USB_ClassInfo_* structures are designed to be controlled by the Class Drivers only for
- *  maintaining the Class Driver instance's state, and should not normally be set by the user application.
+ *  \note The \c State section of the \c USB_ClassInfo_* structures are designed to be controlled by the Class Drivers only
+ *        for maintaining the Class Driver instance's state, and should not normally be altered by the user application.
  *
- *  The following is an example of a properly initialized instance of the MIDI Class Driver structure:
+ *  The following is an example of a properly initialized instance of the MIDI Host Class Driver structure:
  *
  *  \code
  *  USB_ClassInfo_MIDI_Host_t My_MIDI_Interface =
@@ -277,7 +278,7 @@
  *  \endcode
  *
  *  To initialize the Class driver instance, the driver's <tt><b>{Class Name}</b>_Host_ConfigurePipes()</tt> function
- *  should be called in response to the host state machine entering the \ref HOST_STATE_Addressed state. This function
+ *  should be called in response to the \c EVENT_USB_Host_DeviceEnumerationComplete() event firing. This function will
  *  will return an error code from the class driver's <tt><b>{Class Name}</b>_EnumerationFailure_ErrorCodes_t</tt> enum
  *  to indicate if the driver successfully initialized the instance and bound it to an interface in the attached device.
  *  Like all the class driver functions, this function takes in the address of the specific instance you wish to initialize -
@@ -285,40 +286,48 @@
  *  based Host mode application may look like the following:
  *
  *  \code
- *      switch (USB_HostState)
+ *  void EVENT_USB_Host_DeviceEnumerationComplete(void)
+ *  {
+ *      LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
+ *  
+ *      uint16_t ConfigDescriptorSize;
+ *      uint8_t  ConfigDescriptorData[512];
+ *  
+ *      if (USB_Host_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, ConfigDescriptorData,
+ *                                             sizeof(ConfigDescriptorData)) != HOST_GETCONFIG_Successful)
+ *      {
+ *          LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+ *          return;
+ *      }
+ *  
+ *      if (MIDI_Host_ConfigurePipes(&Keyboard_MIDI_Interface,
+ *                                   ConfigDescriptorSize, ConfigDescriptorData) != MIDI_ENUMERROR_NoError)
+ *      {
+ *          LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+ *          return;
+ *      }
+ *  
+ *      if (USB_Host_SetDeviceConfiguration(1) != HOST_SENDCONTROL_Successful)
  *      {
- *          case HOST_STATE_Addressed:
- *              LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
- *
- *              uint16_t ConfigDescriptorSize;
- *              uint8_t  ConfigDescriptorData[512];
- *
- *              if (USB_Host_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, ConfigDescriptorData,
- *                                                     sizeof(ConfigDescriptorData)) != HOST_GETCONFIG_Successful)
- *              {
- *                  LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
- *                  USB_HostState = HOST_STATE_WaitForDeviceRemoval;
- *                  break;
- *              }
- *
- *              if (MIDI_Host_ConfigurePipes(&My_MIDI_Interface,
- *                                           ConfigDescriptorSize, ConfigDescriptorData) != MIDI_ENUMERROR_NoError)
- *              {
- *                  LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
- *                  USB_HostState = HOST_STATE_WaitForDeviceRemoval;
- *                  break;
- *              }
- *
- *              // Other state handler code here
+ *          LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+ *          return;
+ *      }
+ *  
+ *      LEDs_SetAllLEDs(LEDMASK_USB_READY);
+ *  }
  *  \endcode
  *
- *  Note that the function also required the device's configuration descriptor so that it can determine which interface
+ *  Note that the function also requires the device's configuration descriptor so that it can determine which interface
  *  in the device to bind to - this can be retrieved as shown in the above fragment using the
  *  \ref USB_Host_GetDeviceConfigDescriptor() function. If the device does not implement the interface the class driver
  *  is looking for, if all the matching interfaces are already bound to class driver instances or if an error occurs while
  *  binding to a device interface (for example, a device endpoint bank larger that the maximum supported bank size is used)
  *  the configuration will fail.
  *
+ *  To complete the device enumeration after binding the host mode Class Drivers to the attached device, a call to
+ *  \c USB_Host_SetDeviceConfiguration() must be made. If the device configuration is not set within the 
+ *  \c EVENT_USB_Host_DeviceEnumerationComplete() event, the host still will assume the device enumeration has failed.
+ *
  *  Once initialized, it is important to maintain the class driver's state by repeatedly calling the Class Driver's
  *  <tt><b>{Class Name}</b>_Host_USBTask()</tt> function in the main program loop. The exact implementation of this
  *  function varies between class drivers, and can be used for any internal class driver purpose to maintain each
@@ -334,10 +343,8 @@
  *
  *      for (;;)
  *      {
- *          switch (USB_HostState)
- *          {
- *             // Host state machine handling here
- *          }
+ *          if (USB_HostState != HOST_STATE_Configured)
+ *              Create_And_Process_Samples();
  *
  *          MIDI_Host_USBTask(&My_Audio_Interface);
  *          USB_USBTask();