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Task Model
4
F4-3(4)
Once the transfer has completed, the USB device controller generates an
interrupt. Depending of the operation (transmission or reception) the USB
device controller’s driver ISR invokes the transmit complete or receive complete
function from the core.
F4-3(5)
If the operation is synchronous, the transmit or receive complete function will
signal the transfer ready counting semaphore. If the operation is asynchronous,
the transmit or receive complete function will put a message in the USB core
event queue for deferred processing by the USB core task.
F4-3(6)
If the operation is synchronous, the endpoint layer will wait on the counting
semaphore. The operation repeats steps 2 to 5 until the whole transfer has
completed.
F4-3(7)
The core task waits on events to be put in the core event queue. In
asynchronous transfers, the core task will call the endpoint layer until the
operation is completed.
F4-3(8)
In asynchronous mode, after the transfer has completed the core task will call
the application completion callback to notify the end of the I/O operation.
4-2-2 PROCESSING USB REQUESTS AND BUS EVENTS
USB requests are processed by the core task. Figure 4-4 shows a simplified task diagram of
a USB request processing. USB bus events such as reset, resume, connect, disconnect, and
suspend are processed in the same way as the USB requests. The core process the USB bus
events to modify and update the current state of the device.
61
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