Embedded Systems Design with the Atmel AVR Microcontroller Part II

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174 CHAPTER 6. TIMING SUBSYSTEM //Clear conversion ready flag ADCSRA |= 0x10; } //************************************************************************* unsigned int readADC(unsigned char channel) { unsigned int binary_weighted_voltage, binary_weighted_voltage_low; unsigned int binary_weighted_voltage_high; //weighted binary ADMUX = channel; //Select channel ADCSRA |= 0x43; //Start conversion //Set ADC module prescalar to 8 //critical 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
6.11. PULSE WIDTH MODULATION: AUTOMATED FAN COOLING SYSTEM 175 void LCD_init(void) { delay_5ms(); delay_5ms(); delay_5ms(); // output command string to //initialize LCD putcommand(0x38); //function set 8-bit delay_5ms(); putcommand(0x38); //function set 8-bit delay_5ms(); 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 } //************************************************************************* //putchar:prints specified ASC<strong>II</strong> character to LCD //************************************************************************* 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_5ms(); } //************************************************************************* //performs specified LCD related command //*************************************************************************
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Embedded Systems Design with the At
Page 4 and 5: iv An Introduction to Logic Circuit
Page 6 and 7: Copyright © 2010 by Morgan & Clayp
Page 8 and 9: ABSTRACT This textbook provides pra
Page 10 and 11: x CONTENTS 7 6.9.3 Input Capture Mo
Page 12 and 13: xii CONTENTS A 8.5.3 Circuit diagra
Page 15: Preface In 2006 Morgan & Claypool P
Page 18 and 19: 138 CHAPTER 6. TIMING SUBSYSTEM x(t
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224 CHAPTER 7. ATMEL AVR OPERATING
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236 CHAPTER 8. SYSTEM LEVEL DESIGN
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270 APPENDIX A. ATMEGA164 REGISTER
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272 APPENDIX A. ATMEGA164 REGISTER
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Author’s Biography STEVEN F. BARR
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296 INDEX switch debouncing, 187 sw
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