Embedded Systems Design with the Atmel AVR Microcontroller Part II

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242 CHAPTER 8. SYSTEM LEVEL DESIGN { 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
8.2. WEATHER STATION 243 delay(1); putcommand(0x38); //Function set 8-bit delay(1); putcommand(0x38); //Function set 8-bit putcommand(0x38); //One line, 5x7 char putcommand(0x0E); //Display on putcommand(0x01); //Display clear-1.64 ms putcommand(0x06); //Entry mode set putcommand(0x00); //Clear display, cursor at home putcommand(0x00); //Clear display, cursor at home } //************************************************************************* void putChar(unsigned char˜(c) { DDRC = 0xff; //Set PORTC as output DDRD = DDRD|0xC0; //Make PORTD[7:6] output PORTC = c; PORTD = PORTD|0x80; //RS=1 PORTD = PORTD|0x40; //E=1 PORTD = PORTD&0xbf; //E=0 delay(1); } //************************************************************************* void putcommand(unsigned char˜(d) { DDRC = 0xff; //Set PORTC as output DDRD = DDRD|0xC0; //Make PORTD[7:6] output PORTD = PORTD&0x7f; //RS=0 PORTC = d; PORTD = PORTD|0x40; //E=1 PORTD = PORTD&0xbf; //E=0 delay(1); }
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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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138 CHAPTER 6. TIMING SUBSYSTEM x(t
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182 CHAPTER 7. ATMEL AVR OPERATING
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Author’s Biography STEVEN F. BARR
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296 INDEX switch debouncing, 187 sw
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Embedded Systems Design with the Atmel AVR Microcontroller Part II

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