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// Mega168 A/D Accelaration-sensor-switch

// AVR Device : ATmega168

// PD0,1,2 : Switch Contact Active low ( 0:ON, 1:OFF )

// ADC0, ADC1, ADC2 (PIN23, 24, 25) connect to Accelaration sensor

#include <avr/io.h>

void wait(volatile long i)

{

  while(i-- > 0);

}

void sw_high(int id)

{

  switch (id) {

    case 0:

    PORTD |= (1<<PD0);

    break;

    case 1:

    PORTD |= (1<<PD1);

    break;

    case 2:

    PORTD |= (1<<PD2);

    break;

    case 3:

    PORTD |= (1<<PD3);

    break;

    case 4:

    PORTD |= (1<<PD4);

    break;

    case 5:

    PORTD |= (1<<PD5);

    break;

    default:

    PORTD |= 0xff;

  }

}

void sw_low(int id)

{

  switch (id) {

    case 0:

    PORTD &= ~(1<<PD0);

    break;

    case 1:

    PORTD &= ~(1<<PD1);

    break;

    case 2:

    PORTD &= ~(1<<PD2);

    break;

    case 3:

    PORTD &= ~(1<<PD3);

    break;

    case 4:

    PORTD &= ~(1<<PD4);

    break;

    case 5:

    PORTD &= ~(1<<PD5);

    break;

    default:

    PORTD &= 0x00;

  }

}

void init_adc(void)

{

  // AD Conv. Enable & Clock ferquency and the input clock to the ADC)

  ADCSRA = ( (1<<ADEN) | (1<<ADPS2) | (1<<ADPS1) | (0<<ADPS0) );

}

unsigned int get_ad(char adcport)

// arg:   adcport : 0 -

{

  ADMUX = (1<<ADLAR) | adcport; // AD-Conv. 8-bit precision, Use ADC-PORT0

  ADCSRA |= (1<<ADIF); // Set ADC Interrupt flag

  ADCSRA |= (1<<ADSC); // Start AD Conv.

  while ( ( ADCSRA & (1<<ADIF) ) == 0); //Wait to complete adc

  return (unsigned int)ADCH; // 8-bit precision

}

#define ADC_G_POS 168

#define ADC_G_NEG 100

#define AXIS_X 0x00

#define AXIS_Y 0x01

#define AXIS_Z 0x02

#define AXIS_NULL 0xff

int main(void)

{

  unsigned int adx, ady, adz; // ADC input signal

  unsigned char mode = AXIS_NULL;

  init_adc(); // ADC port initialize

  wait(10000); // wait a moment

  // PORTD0-5 を出力モード

  DDRD = (1<<PD5) | (1<<PD4) | (1<<PD3) | (1<<PD2) | (1<<PD1)| (1<<PD0);

  sw_high(6);

  while(1) {

    adx = get_ad(0x00); // ADC0 X-axis

    ady = get_ad(0x01); // ADC1 Y-axis

    adz = get_ad(0x02); // ADC2 Z-axis

    if ( mode != AXIS_X &&  adx > ADC_G_POS ) {

      sw_low(0);

      wait(1000);

      mode = AXIS_X;

      sw_high(6);

    } else if ( mode != AXIS_X && adx < ADC_G_NEG ) {

      sw_low(0);

      wait(1000);

      mode = AXIS_X;

      sw_high(6);

    } else if ( mode != AXIS_Y && ady > ADC_G_POS ) {

      sw_low(1);

      wait(1000);

      mode = AXIS_Y;

      sw_high(6);

    } else if ( mode != AXIS_Y && ady < ADC_G_NEG ) {

      sw_low(1);

      mode = AXIS_Y;

      wait(1000);

      sw_high(6);

    } else if ( mode != AXIS_Z && adz > ADC_G_POS ) {

      sw_low(2);

      mode = AXIS_Z;

      wait(1000);

      sw_high(6);

    } else if ( mode != AXIS_Z && adz < ADC_G_NEG ) {

      sw_low(2);

      wait(1000);

      mode = AXIS_Z;

      sw_high(6);

    } else {

      sw_high(6);

    }

  }

  return 0;

}

# AVR-GCC Makefile

PROJECT=mega168-adc012

SOURCES=mega168-adc012.c

CC=avr-gcc

OBJCOPY=avr-objcopy

MMCU=atmega168

TARGETDEV=m168P

CFLAGS=-mmcu=$(MMCU) -Wall

$(PROJECT).hex: $(PROJECT).out

$(PROJECT).out: $(SOURCES)

program: $(PROJECT).hex

clean: