Intial commit

.gitignore

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+bin/
+.vscode/

makefile

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+MCU=atmega32
+F_CPU=8000000
+PROG=dragon_jtag
+DEBUGGER = dragon
+PORT=/dev/ttyUSB0
+
+CC=avr-g++
+OBJCOPY=avr-objcopy
+CFLAGS=-Wall -g -mmcu=${MCU} -DF_CPU=${F_CPU} -I.
+TARGET=main
+SRCS=src/*.cpp 
+
+default: build flash
+
+build:
+	${CC} ${CFLAGS} -o bin/${TARGET}.bin  ${SRCS}
+	${CC} ${CFLAGS} -o bin/${TARGET}.elf  ${SRCS}
+	${OBJCOPY} -j .text -j .data -O ihex bin/${TARGET}.bin bin/${TARGET}.hex
+
+flash:
+	avrdude -p ${MCU} -c ${PROG} -U flash:w:bin/main.hex
+
+clean:
+	rm -f bin/*
+
+debug: flash avarice
+	sleep 1
+	avr-gdb -ex "target remote :4242" bin/main.elf
+
+avarice:
+	avarice --file bin/main.elf --part ${MCU} --${DEBUGGER} :4242

src/main.cpp

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+#define F_CPU 8000000UL
+#include <avr/io.h>
+#include <util/delay.h>
+#include <avr/interrupt.h>
+#include "photointerrupter.h"
+ 
+
+int main() 
+{ 
+    photointerrupter::init();
+	DDRD |= (1<<PD6);
+
+	while(1);
+    return 0; 
+} 
+
+ PHOTOINTERRUPT {
+	cli();
+	PORTD |= (1<<PD6);
+	_delay_ms(100);
+	PORTD &= ~(1<<PD6);
+	GIFR |= (1<<INTF1);
+	sei();
+}

src/photointerrupter.cpp

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+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include "photointerrupter.h"
+
+namespace photointerrupter {
+    void init() {
+        TCCR2 |= (1<<WGM21); //CTC TOP OCR2
+        TCCR2 |= (1<<COM20); //Toggle OC0 
+        TCCR2 |= (1<<CS20); //No prescale
+        OCR2 |= 105;
+        //DDRB |= (1<<PB3);
+        DDRD |= (1<<PD6)|(1<<PD7);
+        //TIMSK |= (1<<OCIE0);
+
+        MCUCR |= (1<<ISC11)|(1<<ISC10); //INT1 rising edge
+        GICR |= (1<<INT1);
+        
+        sei();
+    }
+
+    ISR(TIMER2_COMP_vect) {
+        volatile static int count;
+        count++;
+        if(count == 60) TCCR2 &= ~(1<<CS20);
+        if(count > 600) { 
+            TCCR2 |= (1<<CS20);
+            count = 0;
+        }
+    }
+} // namespace photointerrupter

src/photointerrupter.h

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+#pragma once
+#define PHOTOINTERRUPT ISR(INT1_vect)
+
+namespace photointerrupter {
+    void init();
+} // namespace photointerrupter