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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.

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This commit is contained in:
Dean Camera 2009-08-16 08:51:54 +00:00
parent 25ddbb9e3b
commit b71ff7c8cd
23 changed files with 83 additions and 75 deletions
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13
LUFA/Drivers/USB/HighLevel/Events.h
View file

@ -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

7
LUFA/Drivers/USB/HighLevel/USBInterrupt.c
View file

@ -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)