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Analog-to-Digital Converter Peripheral Labs
Next, the Get_Inputs() performs an ADC on the voltage present on pin 13 using the
same code as Lab 1 with one minor change. This application is very dependant on the
timing of the software control loop. The 1mS delay used in Lab 1 to allow the hold
capacitor on the input of ADC to fully charge to the pin voltage is excessive. Using the
example given in Equation 9-1, Section 9 in the PIC16F690 Data Sheet as a reference,
the acquisition delay time is shortened to 8 μ S which should be sufficient.
The Decide() assigns the ADC result value, shifted three bit positions to the left, to
the TMR0_preload variable.
The Do_Outputs() assigns the current toggle bit value to RC0 that will transition
the output accordingly.
Finally, the Timing() clears the TMR0 overflow flag (T0IF), preloads the TMR0
register with the TMR0_preload value subtracted from 255. The function then waits
until the T0IF is set high before returning to the main() . In this way, as the temperature
at the thermistor increases, as will the frequency of the PWM.
5.2.4.2
PROCEDURE
Using the firmware developed in the previous lab, make the following changes:
1. Copy/paste the code in Example 5-8 into the top of the main firmware source file
under the heading labeled:
//----------------DATA MEMORY---------------
Note:
Be sure to paste over the code from the previous lab.
EXAMPLE 5-8:
GLOBAL VARIABLES USE IN ADC LAB 2
unsigned char LED_Output = 0; //assigned to PORTC to light
//connected LEDs
bit toggle = 0;//Used to generate waveform on RC0
unsigned char TMR0_preload = 0; //Varied by ADRESH to change
//frequency of
//waveform on RC0
2. Copy/paste the code in Example 5-9 over the Initialize() code from the
previous lab:
? 2009 Microchip Technology Inc.
DS41369A-page 87
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