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44-Pin Demo Board User’s Guide
One of the simplest ways to switch debounce is to sample the switch until the signal is
stable or continue to sample the signal until no more bounces are detected. How long
to continue sampling requires some investigation. However, 5 mS is usually plenty
long, while still reacting fast enough that the user won’t notice it.
Lesson 6 shows how to sample the line at a 1 mS rate waiting for a number of sequen-
tial state changes, which is a simple matter of counting to 5, then resetting the counter
every time it’s still in the original unchanged state.
The Switch on the 44-Pin Demo Board doesn’t bounce much, but it is good practice to
debounce all switches in the system.
FIGURE 3-6:
SIMPLE SWITCH DEBOUNCE PROGRAM FLOW
Yes
Switch has
changed states?
No
Increment Counter
Is Counter = 5?
Yes
Change State
Reset Counter
No
Delay 1 mS
Reset Counter
3.2.7
Lesson 7: Reversible Variable Speed Rotate
Lesson 7 combines Lessons 5 and 6 using the button to reverse the direction of rotation
when the button is pressed and adjusting the potentiometer to control the speed of
rotation.
The program needs to keep track of rotation direction and new code needs to be added
to rotate in the other direction.
Lesson 5 rotates right and checks for a ‘ 1 ’ in the Carry bit to determine when to restart
the sequence. In Lesson 7, we’ll also need to rotate left and check for a ‘ 1 ’ in bit 7 of
the display. When the ‘ 1 ’ shows up in bit 7 of the display, insert it into the bit 0 position.
DS41296B-page 24
? 2007 Microchip Technology Inc.
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