July 2008
Intermediate to advanced
544 pages
16h 52m
English
Content preview from Computers as Components, 2nd Edition
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42 CHAPTER 1 Embedded Computing
the panel display; otherwise, it causes the required message to be sent. Figure 1.26
shows a state diagram for the panel-active behavior.
The definition of the train’s Controller class is shown in Figure 1.27.The operate
behavior is called by the receiver when it gets a new command;operate looks at the
contents of the message and uses the issue-command behavior to change the speed,
direction, and inertia settings as necessary. A specification for operate is shown in
Figure 1.28.
panel*: read-knob( )
panel*: read-speed( )
current-train !5 train-knob
T
F
F
F
F
current-train 5 train-knob
update-screen
changed 5 true
current-speed !
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