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General Purpose Input/Output Labs
A new function called Get_Inputs() is used to check the RA2 pin voltage. Referring
to Figure 3-12, the RA2 pin connected to the push button (SW1) is pulled to V DD using
a 10 K Ω resistor. This pull-up resistor eliminates noise on the pin that could trigger
“false” push button presses. The second terminal of the push button is connected to
V SS . In this way, when a user presses the push button the voltage present on RA2 will
transition from V DD (high or ‘ 1 ’) to V SS (low or ‘ 0 ’). The software flowchart for the
Get_Inputs() is shown in Figure 3-20.
FIGURE 3-20:
GET_INPUTS() SOFTWARE FLOWCHART FOR LAB 5
Get_Inputs()
RA0 = 0
?
NO
YES
Delay_5mS()
Debounces signal
on RA2
Contents of direction
remain unchanged
END
NO
RA0 = 0
?
YES
Toggle contents of
direction
Referring to the flowchart in Figure 3-20, the Get_Inputs() first checks the voltage
level on the RA2 pin. If the voltage is logic low (= 0 or V SS ), a 5mS delay is implemented
using a new support routine called Delay_5mS() to allow any switch bouncing to set-
tle. The Delay_5mS() is based off of the Timer0 peripheral as discussed in Lab 3. The
software flowchart for Delay_5mS() is shown in Figure 3-21.
? 2009 Microchip Technology Inc.
DS41369A-page 41
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