@ -40,7 +40,8 @@
* listed here . If an event with no user - associated handler is fired within the library , it by default maps to an
* internal empty stub function .
*
* Each event must only have one associated event handler , but can be raised by multiple sources .
* Each event must only have one associated event handler , but can be raised by multiple sources by calling the event
* name just like any regular C function ( with any required event parameters ) .
*
* @ {
*/
@ -142,12 +143,19 @@
/** Event for USB device enumeration completion. This event fires when a the USB interface is
* in host mode and an attached USB device has been completely enumerated and is ready to be
* controlled by the user application .
*
* This event is time - critical ; exceeding OS - specific delays within this event handler ( typically of around
* 1 second ) when a transaction is waiting to be processed by the device will prevent break communications
* and cause the host to reset the USB bus .
*/
void EVENT_USB_Host_DeviceEnumerationComplete ( void ) ;
/** Event for USB device connection. This event fires when the AVR in device mode and the device is connected
* to a host , beginning the enumeration process , measured by a rising level on the AVR ' s VBUS pin .
*
* This event is time - critical ; exceeding OS - specific delays within this event handler ( typically of around
* two seconds ) will prevent the device from enumerating correctly .
*
* \ note For the smaller series 2 USB AVRs with limited USB controllers , VBUS is not available to the USB controller .
* this means that the current connection state is derived from the bus suspension and wake up events by default ,
* which is not always accurate ( host may suspend the bus while still connected ) . If the actual connection state
@ -182,8 +190,10 @@
/** Event for unhandled control requests. This event fires when a the USB host issues a control
* request to the control endpoint ( address 0 ) that the library does not handle . This may either
* be a standard request that the library has no handler code for , or a class specific request
* issued to the device which must be handled appropriately . Due to the strict timing requirements
* on control transfers , interrupts are disabled during control request processing .
* issued to the device which must be handled appropriately .
*
* This event is time - critical ; eack packet within the request transaction must be acknowedged or
* sent within 50 ms or the host will abort the transfer .
*
* \ note This event does not exist if the USB_HOST_ONLY token is supplied to the compiler ( see
* \ ref Group_USBManagement documentation ) .
@ -199,6 +209,9 @@
* selected configuration number while in device mode . This event should be hooked in device
* applications to create the endpoints and configure the device for the selected configuration .
*
* This event is time - critical ; exceeding OS - specific delays within this event handler ( typically of around
* one second ) will prevent the device from enumerating correctly .
*
* This event fires after the value of \ ref USB_ConfigurationNumber has been changed .
*
* \ note This event does not exist if the USB_HOST_ONLY token is supplied to the compiler ( see
@ -236,6 +249,9 @@
* a the USB host requests that the device reset its interface . This event fires after the control
* endpoint has been automatically configured by the library .
*
* This event is time - critical ; exceeding OS - specific delays within this event handler ( typically of around
* two seconds ) will prevent the device from enumerating correctly .
*
* \ note This event does not exist if the USB_HOST_ONLY token is supplied to the compiler ( see
* \ ref Group_USBManagement documentation ) .
*/
@ -245,8 +261,11 @@
* 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 .
* This event is time - critical ; it is run once per millisecond and thus long handlers will significantly
* degrade device performance . This event should only be enabled when needed to reduce device wakeups .
*
* \ note 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 ) .
Dean Camera
15 years ago