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Analog-to-Digital Converter Peripheral Labs
EXAMPLE 5-10:
GET_INPUTS() CODE FOR ADC LAB 2
unsigned char counter = 2;
//Give ADC hold capacitor time to charge
//This works out to approximately 8uS
while(--counter > 0);
//Start conversion by setting the GO/DONE bit.
GODONE = 1;
//Wait for ADC conversion to complete
//Polling the GO/DONE bit
// 0 = ADC completed
// 1 = ADC in progress
while(GODONE == 1);
4. Copy/paste the code in Example 5-11 over the Decide() code from the previ-
ous lab:
EXAMPLE 5-11:
DECIDE() CODE FOR ADC LAB 2
//Shift the ADRESH result to the left
//by three bit positions and assign to
//TMR0_preload
TMR0_preload = ADRESH<<3;
//XOR the toggle value with 1
toggle ^= 1;
5. Copy/paste the code in Example 5-12 over the Do_Outputs() code from the
previous lab:
EXAMPLE 5-12:
D0_OUTPUTS() CODE FOR ADC LAB 2
//Assign the toggle value to RC0 pin
RC0 = toggle;
6. Copy/paste the code in Example 5-13 into the Timing() section labeled:
//ADD TIMING CODE HERE
EXAMPLE 5-13:
TIMING() CODE FOR ADC LAB 2
//Clear the T0IF
T0IF = 0;
//Subtract the TMR0_preload value from 255 and
//then use to preload TMR0
TMR0 = 255 – TMR0_preload;
//Sit here and wait for TMR0 to overflow while (T0IF == 0);
? 2009 Microchip Technology Inc.
DS41369A-page 89
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