ACM Subclass
F8-4(4)
The menu option #1 is the Echo 1 demo . It allows you to send one unique
character to the device. This character is received by the serial task and sent
back to the host.
8
F8-4(5)
The menu options #2 is the Echo N demo. It allows you to send several
characters to the device. All the characters are received by the serial task and
sent back to the host. The serial task can receive a maximum of 512 characters.
Figure 8-5 CDC Serial Demo Menu in HyperTerminal
To support the two demos, the serial task implements a state machine as shown in Figure 8-
6. Basically, the state machine has two paths corresponding to the user choice in the serial
terminal menu.
Figure 8-6 Serial Demo State Machine
133
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