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Chapter 6
6
Setup Packet
USBD_EventSetup()
Receive Packet Completed
Transmit Packet Completed
USBD_EP_RxCmpl()
USBD_EP_TxCmpl()
Table 6-1 Status Notification API
Each status notification API queues the event type to be processed by the USB stack’s event
processing task. Upon reception of an USB event, the interrupt service routine may perform
some operations associated to the event before notifying the stack. For example, the USB
device controller driver must perform the proper actions for the bus reset when an interrupt
request for that event is triggered. Additionally, it must also notify the USB device stack
about the bus reset event by invoking the proper status notification API. In general, the
device driver interrupt handler must perform the following functions:
1
Determine which type of interrupt event occurred by reading an interrupt status
register.
2
If a receive event has occurred, the driver must post the successful completion or the
error status to the USB device stack by calling USBD_EP_RxCmpl() for each transfer
received.
3
If a transmit complete event has occurred, the driver must post the successful
completion or the error status to the USB device stack by calling USBD_EP_TxCmpl() for
each transfer transmitted.
4
If a setup packet event has occurred, the driver must post the setup packet data in little-
endian format to the USB device stack by calling USBD_EventSetup() .
5
All other events must be posted to the USB device stack by a call to their corresponding
status notification API from Table 1. This allows the USB device stack to broadcast these
event notifications to the classes.
6
Clear local interrupt flags.
84
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