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General Purpose Input/Output Labs
FIGURE 3-22:
DECIDE() SOFTWARE FLOWCHART FOR LAB 5
Decide()
YES
direction = 0
?
NO
LED_Output = 0b10000000
or
YES
LED_Output = 0b00000001
or
YES
LED_Output = 0b00000000
?
NO
Shift contents of
LED_Output left
by 1 bit position
LED_Output =
0b00000001
LED_Output = 0b00000000
?
NO
LED_Output = 0b10000000
Shift contents of
LED_Output right
by 1 bit position
END
Similar to the previous lab, Decide() checks the LED_Output variable value before
executing the shift to ensure that the variable is not all 0 ’s or that the Most Significant
bit, for a left shift, or Least Significant bit, for a right shift, are not ‘ 1 ’, indicating that the
shift that follows will fill the LED_Output variable with 0 ’s.
The Do_Outputs() simply assigns the contents of the LED_Output variable to the
PORTC register lighting the connected LEDs accordingly.
3.4.4.3
PROCEDURE
Using the firmware developed in the previous lab, make the following changes:
Copy/paste the code in Example 3-16 into the top of the firmware source template under the
section marked:
//--------------------DATA MEMORY----------------------
EXAMPLE 3-16:
VARIABLE DECLARATIONS FOR LAB 5
unsigned char LED_Output;//Variable used to set/clear PORTC bits
bit direction;//Variable to select direction of shifting LEDs
? 2009 Microchip Technology Inc.
DS41369A-page 43
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