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Chapter 4
4
App
Task
(1)
USB Class
(7)
(2)
Core
Endpoint
(6)
(6)
Transfer Ready
Semaphore
(5)
Core
Task
USB Events
Queue
(5)
Application
Callback
(3)
Device driver
USB Device
Controller
(4)
Tx/Rx
ISR
Asynchronous I/O
Datapath
Synchronous I/O
Datapath
Universal Serial Bus
Figure 4-3 Sending and Receiving a Packet
F4-3(1)
An application task that wants to receive or send data interfaces with μC/USB-
Device through the USB classes API. The USB classes API interface with the
core API and the core interfaces with the endpoint layer API.
F4-3(2)
The endpoint layer API prepares the data depending on the endpoint
characteristics.
F4-3(3)
When the USB device controller is ready, the driver prepares the transmission
or the reception.
60
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