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General Purpose Input/Output Labs
FIGURE 3-23:
Global Variables:
MAIN() SOFTWARE CONTROL LOOP FLOWCHART FOR
GPIO LAB 6
main()
? 8-bit variable LED_Output will be used to light
the LEDs connected to PORTC
? 1-bit variable direction used to determine the
direction of the sequential LED flashing
0 = shift PORTC bits right-to-left
Initialize()
1 = shift PORTC bits left-to-right
Decide()
Loop Forever
Do_Outputs()
Timing()
Note the removal of the Get_Inputs() from the previous lab. This code will now be
handled by an Interrupt Service Routine (ISR) whenever the push button is pressed.
The PB_PressISR() flowchart is shown in Figure 3-24.
FIGURE 3-24:
PB_PRESSISR() FOR LAB 6 SHOWING SWITCH DEBOUNCE
PB_PressISR()
NO
INTE and INTF
bits set
?
YES
Clear INTF flag
RA2 pin = 0
?
NO
YES
Delay for 5mS
? 2009 Microchip Technology Inc.
direction = direction
RETURN
NO
RA2 pin = 0
?
YES
Toggle direction
DS41369A-page 49
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