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Analog-to-Digital Converter Peripheral Labs
FIGURE 5-3:
MAIN() SOFTWARE CONTROL LOOP FLOWCHART FOR
COMPARATOR LAB 1
Get_Inputs()
Gives ADC capacitor time to charge
Wait for ADC to complete
Delay_1mS()
Start conversion by setting
GO/DONE bit
GO/DONE = 1
YES
?
NO
END
Following the Get_Inputs() , the 10-bit ADC result is now in the ADRESH:ADRESL
registers. The Decide() assigns the ADC result value, shifted four bit positions to the
right, to the LED_Output variable.
Finally, the Do_Outputs() assigns the contents of LED_Output to the PORTC
register that will light the LEDs connected to RC0, RC1, RC2 and RC3 accordingly.
5.2.3.3
PROCEDURE
Using the Project Wizard, create a new project called ADC_Lab1.mcp . Once com-
pleted, open the ADC_Lab1.c source file in MPLAB and make the following changes:
1. Copy/paste the code in Example 5-1 into the top of the main firmware source file
under the heading labeled:
//----------------DATA MEMORY---------------
EXAMPLE 5-1:
GLOBAL VARIABLES USED IN LAB 1
unsigned char LED_Output = 0;//assigned to PORTC to light
//connected LEDs
2. Copy/paste the code in Example 5-2 into the top of the main firmware source file
under the heading labeled:
//----------------SUPPORT ROUTINES---------------
? 2009 Microchip Technology Inc.
DS41369A-page 79
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