Added new EVENT_USB_Device_StartOfFrame() event, controlled by the new USB_Device_EnableSOFEvents() and USB_Device_DisableSOFEvents() macros to give bus-synchronised millisecond interrupts when in USB device mode.

4 files changed, 38 insertions, 1 deletions

diff --git a/LUFA/Drivers/USB/Class/Device/HID.h b/LUFA/Drivers/USB/Class/Device/HID.h
index 0c141e62c..d995c09aa 100644
--- a/LUFA/Drivers/USB/Class/Device/HID.h
+++ b/LUFA/Drivers/USB/Class/Device/HID.h
@@ -119,7 +119,9 @@
 			void HID_Device_USBTask(USB_ClassInfo_HID_Device_t* HIDInterfaceInfo);

 			

 			/** Indicates that a millisecond of idle time has elapsed on the given HID interface, and the interface's idle count should be

-			 *  decremented. This should be called once per millisecond so that hardware key-repeats function correctly.

+			 *  decremented. This should be called once per millisecond so that hardware key-repeats function correctly. It is recommended

+			 *  that this be called by the \ref EVENT_USB_Device_StartOfFrame() event, once SOF events have been enabled via

+			 *  \ref USB_Device_EnableSOFEvents();.

 			 *

 			 *  \param[in,out] HIDInterfaceInfo  Pointer to a structure containing a HID Class configuration and state.

 			 */

diff --git a/LUFA/Drivers/USB/HighLevel/Events.h b/LUFA/Drivers/USB/HighLevel/Events.h
index 1e638314c..4ed6537b7 100644
--- a/LUFA/Drivers/USB/HighLevel/Events.h
+++ b/LUFA/Drivers/USB/HighLevel/Events.h
@@ -234,6 +234,18 @@
 			 *        \ref Group_USBManagement documentation).

 			 */

 			void EVENT_USB_Device_Reset(void);

+

+			/** Event for USB Start Of Frame detection, when enabled. This event fires at the start of each USB

+			 *  frame, once per millisecond, and is synchronised to the USB bus. This can be used as an accurate

+			 *  millisecond timer source when the USB bus is enumerated in device mode to a USB host.

+			 *

+			 *  This event is not normally active - it must be manually enabled and disabled via the

+			 *  \ref USB_Device_EnableSOFEvents() and \ref USB_Device_DisableSOFEvents() commands after enumeration.

+			 *

+			 *  \note This event does not exist if the USB_HOST_ONLY token is supplied to the compiler (see

+			 *        \ref Group_USBManagement documentation).

+			 */

+			void EVENT_USB_Device_StartOfFrame(void);

 		#endif

 		

 	/* Private Interface - For use in library only: */

@@ -264,6 +276,7 @@
 					void EVENT_USB_Device_Suspend(void) ATTR_WEAK ATTR_ALIAS(USB_Event_Stub);

 					void EVENT_USB_Device_WakeUp(void) ATTR_WEAK ATTR_ALIAS(USB_Event_Stub);

 					void EVENT_USB_Device_Reset(void) ATTR_WEAK ATTR_ALIAS(USB_Event_Stub);

+					void EVENT_USB_Device_StartOfFrame(void) ATTR_WEAK ATTR_ALIAS(USB_Event_Stub);

 				#endif

 			#endif

 	#endif

diff --git a/LUFA/Drivers/USB/HighLevel/USBInterrupt.c b/LUFA/Drivers/USB/HighLevel/USBInterrupt.c
index 00fe7d1dc..a8083c92a 100644
--- a/LUFA/Drivers/USB/HighLevel/USBInterrupt.c
+++ b/LUFA/Drivers/USB/HighLevel/USBInterrupt.c
@@ -153,6 +153,13 @@ ISR(USB_GEN_vect, ISR_BLOCK)
 

 		EVENT_USB_Device_Reset();

 	}

+	

+	if (USB_INT_HasOccurred(USB_INT_SOFI) && USB_INT_IsEnabled(USB_INT_SOFI))

+	{

+		USB_INT_Clear(USB_INT_SOFI);

+		

+		EVENT_USB_Device_StartOfFrame();

+	}

 	#endif

 	

 	#if defined(USB_CAN_BE_HOST)

diff --git a/LUFA/Drivers/USB/LowLevel/Device.h b/LUFA/Drivers/USB/LowLevel/Device.h
index d66def438..f107407bf 100644
--- a/LUFA/Drivers/USB/LowLevel/Device.h
+++ b/LUFA/Drivers/USB/LowLevel/Device.h
@@ -111,12 +111,27 @@
 				 *  \return Boolean true if the USB communications have been suspended by the host, false otherwise.

 				 */

 				static inline bool USB_Device_IsUSBSuspended(void);

+				

+				/** Enables the device mode Start Of Frame events. When enabled, this causes the

+				 *  \ref EVENT_USB_Device_StartOfFrame() event to fire once per millisecond, synchronised to the USB bus,

+				 *  at the start of each USB frame when enumerated in device mode.

+				 */

+				static inline bool USB_Device_EnableSOFEvents(void);

+				

+				/** Disables the device mode Start Of Frame events. When disabled, this stop the firing of the

+				 *  \ref EVENT_USB_Device_StartOfFrame() event when enumerated in device mode.

+				 */

+				static inline bool USB_Device_DisableSOFEvents(void);

 			#else

 				#define USB_Device_SendRemoteWakeup()   MACROS{ UDCON |= (1 << RMWKUP); }MACROE

 

 				#define USB_Device_IsRemoteWakeupSent()       ((UDCON &  (1 << RMWKUP)) ? false : true)

 

 				#define USB_Device_IsUSBSuspended()           ((UDINT &  (1 << SUSPI)) ? true : false)

+				

+				#define USB_Device_EnableSOFEvents()    MACROS{ USB_INT_Enable(USB_INT_SOFI); }MACROE

+

+				#define USB_Device_DisableSOFEvents()   MACROS{ USB_INT_Disable(USB_INT_SOFI); }MACROE

 			#endif

 			

 		/* Type Defines: */