Embedded Systems Design with the Atmel AVR Microcontroller Part II

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192 CHAPTER 7. ATMEL <strong>AVR</strong> OPERATING PARAMETERS AND INTERFACING if(PORTC_value_masked == 0xf0) //no switches depressed in row 0 { PORTC = 0xFD; //assert Row 1 via PORTC[1] PORTC_value = PINC; //read PORTC PORTC_value_masked = (PORTC_value & 0xf0);//mask PORTC[3:0] } //switch depressed in row 2? if(PORTC_value_masked == 0xf0) //no switches depressed in row 0 { PORTC = 0xFB; //assert Row 2 via PORTC[2] PORTC_value = PINC; //read PORTC PORTC_value_masked = (PORTC_value & 0xf0);//mask PORTC[3:0] } //switch depressed in row 3? if(PORTC_value_masked == 0xf0) //no switches depressed in row 0 { PORTC = 0xF7; //assert Row 3 via PORTC[3] PORTC_value = PINC; //read PORTC PORTC_value_masked = (PORTC_value & 0xf0);//mask PORTC[3:0] } if(PORTC_value_masked != 0xf0) { switch(PORTC_value_masked) { case 0xEE: ascii_value = ’0’; break; case 0xDE: ascii_value = ’1’; break; case 0xBE: ascii_value = ’2’; break;
case 0x7E: ascii_value = ’3’; break; case 0xED: ascii_value = ’4’; break; case 0xDD: ascii_value = ’5’; break; case 0xBD: ascii_value = ’6’; break; case 0x7D: ascii_value = ’7’; break; case 0xEB: ascii_value = ’8’; break; case 0xDB: ascii_value = ’9’; break; case 0xBB: ascii_value = ’a’; break; case 0x&B: ascii_value = ’b’; break; case 0xE7: ascii_value = ’c’; break; case 0xD7: ascii_value = ’d’; break; case 0xB7: ascii_value = ’e’; break; case 0x77: ascii_value = ’f’; break; 7.3. INPUT DEVICES 193
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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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140 CHAPTER 6. TIMING SUBSYSTEM spe
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242 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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274 APPENDIX B. ATMEGA164 HEADER FI
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Author’s Biography STEVEN F. BARR
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296 INDEX switch debouncing, 187 sw
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