Embedded Systems Design with the Atmel AVR Microcontroller Part II

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258 CHAPTER 8. SYSTEM LEVEL DESIGN } //************************************************************************* void initialize_ports() { DDRD = 0xFB; DDRC = 0xFF; DDRB = 0xFF; } //************************************************************************* void initialize_ports() { DDRD = 0xFB; DDRC = 0xFF; DDRB = 0xFF; } //************************************************************************* void initialize_ADC() { ADMUX = 0; //Select channel 0 //Enable ADC and set module enable ADC ADCSRA = 0xC3; //Set module prescalar to 8 while(!(ADCSRA & 0x10)); //Wait until conversion is ready ADCSRA |= 0x10; //Clear conversion ready flag } //************************************************************************* unsigned int readADC(unsigned char channel) {
8.4. CIRCUIT DIAGRAM 259 unsigned int binary_weighted_voltage, binary_weighted_voltage_low; unsigned int binary_weighted_voltage_high;//weighted binary voltage ADMUX = channel; //Select channel ADCSRA |= 0x43; //Start conversion //Set ADC module prescalar //to 8 critical for //accurate ADC results while (!(ADCSRA & 0x10)); //Check if conversion is ready ADCSRA |= 0x10; //Clear conv rdy flag - set <strong>the</strong> bit binary_weighted_voltage_low = ADCL; //Read 8 low bits first (important) //Read 2 high bits, multiply by 256 binary_weighted_voltage_high = ((unsigned int)(ADCH
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Embedded Systems Design with the At
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iv An Introduction to Logic Circuit
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Copyright © 2010 by Morgan & Clayp
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ABSTRACT This textbook provides pra
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x CONTENTS 7 6.9.3 Input Capture Mo
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xii CONTENTS A 8.5.3 Circuit diagra
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Preface In 2006 Morgan & Claypool P
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Page 173: Author’s Biography STEVEN F. BARR
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