ATMEGA168で光センサブザーLEDマーカ

// Mega168 A/D Convertor Test / Opt-transistor-Buz-LED-Marker

// AVR Device : ATmega168

// OC1B(PB2) : Buz

// PB0 : LED 1:ON, 0:OFF

// ADC0(PIN23)

#include <avr/io.h>

#define led_on() PORTB |= (1<<PB0)

#define led_off() PORTB &= ~(1<<PB0)

#define buz_on() PORTB |= (1<<PB2)

#define buz_off() PORTB &= ~(1<<PB2)

void wait(volatile long i)

{

while(i-- > 0);

}

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 = adcport; // AD-Conv. PORT Setup

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

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

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

return ADCW;

}

int main(void)

{

volatile long i;

unsigned int s; // ADC input signal

init_adc(); // ADC port initialize

// PORTB2,0 を出力モード

DDRB = (1<<PB2) | (1<<PB0);

while(1) {

s = get_ad(0x00);

led_on();

for ( i = 0; i < (s>>3); i++) {

buz_on(); wait(s>>2);

buz_off(); wait(s>>2);

}

led_off(); wait(s<<5);

}

return 0;

}

// Mega168 A/D Convertor Test / Opt-transistor-Buz-LED-Marker

// AVR Device : ATmega168

// OC1B(PB2) : Buz

// PB0 : LED 1:ON, 0:OFF

// ADC0(PIN23)

#include <avr/io.h>

#define led_on() PORTB |= (1<<PB0)

#define led_off() PORTB &= ~(1<<PB0)

#define buz_on() PORTB |= (1<<PB2)

#define buz_off() PORTB &= ~(1<<PB2)

void wait(volatile long i)

{

while(i-- > 0);

}

void init_timer1_ctc(void)

// Timer/Counter1 を CTC (Clear Timer on Compare mode)モードで初期化

{

TCCR1A = (0<<WGM11) | (0<<WGM10) | (0<<COM1A1) | (0<<COM1A0) | (0<<COM1B1) | (1<<COM1B0);

TCCR1B = (0<<WGM13) | (1<<WGM12) | (0<<CS12) | (1<<CS11) | (0<<CS10);

OCR1A = 0x0000; OCR1B = 0x0000; // OCR1A = 0x0001 で最高周波数、 OCR1A = 0xffff で最低周波数

}

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 = adcport; // AD-Conv. PORT Setup

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

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

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

return ADCW;

}

int main(void)

{

volatile long i;

unsigned int s; // ADC input signal

init_timer1_ctc(); /* タイマ1を CTC モードで初期化 */

init_adc(); // ADC port initialize

// PORTB2,0 を出力モード

DDRB = (1<<PB2) | (1<<PB0);

while(1) {

s = get_ad(0x00);

led_on();

OCR1A = s;

wait(s * 16);

led_off();

OCR1A = 0;

wait(s * 16);

}

return 0;

}

# AVR-GCC Makefile

PROJECT=mega168adc

SOURCES=mega168adc.c

CC=avr-gcc

OBJCOPY=avr-objcopy

MMCU=atmega168

TARGETDEV=m168P

CFLAGS=-mmcu=$(MMCU) -Wall

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

$(OBJCOPY) -j .text -O ihex $(PROJECT).out $(PROJECT).hex

$(PROJECT).out: $(SOURCES)

$(CC) $(CFLAGS) -I./ -o $(PROJECT).out $(SOURCES)

program: $(PROJECT).hex

sudo avrdude -p $(TARGETDEV) -P usb -c avrispmkII -e -U flash:w:$(PROJECT).hex

clean:

rm -f $(PROJECT).out

rm -f $(PROJECT).hex