Add AVR (Arduino Nano) support

#ifndef GPIO_H

#define GPIO_H

class GPIO {

	private:

		GPIO(const GPIO &copy);

	public:

		GPIO () {}

		void setup();

		void led_on(unsigned char id);

		void led_off(unsigned char id);

		void led_toggle(unsigned char id);

};

extern GPIO gpio;

#endif

#ifndef STANDARDOUTPUT_H

#define STANDANDOUTPUT_H

#include "object/outputstream.h"

class StandardOutput : public OutputStream {

	private:

		StandardOutput(const StandardOutput &copy);

	public:

		StandardOutput () {}

		void setup();

		virtual void put(char c) override;

};

extern StandardOutput kout;

#endif

#ifndef UPTIME_H

#define UPTIME_H

#include <avr/io.h>

class Uptime {

	private:

		Uptime(const Uptime &copy);

#ifdef TIMER_S

		uint8_t seconds;

#endif

	public:

#ifdef TIMER_S

		Uptime () : seconds(0) {}

#else

		Uptime () {}

#endif

		inline uint8_t get_cycles() { return TCNT0; }

		inline uint8_t get_us() { return TCNT2/2; }

#ifdef TIMER_S

		inline uint8_t get_s() { return seconds; }

		inline void tick_s() { seconds++; }

#endif

};

extern Uptime uptime;

#endif

# vim:ft=make

MCU = atmega328p

PROGRAMMER ?= usbasp

INCLUDES += -Iinclude/arduino-nano

COMMON_FLAGS += -mmcu=${MCU} -DF_CPU=16000000UL

CC = avr-gcc

CXX = avr-g++

NM = avr-nm

OBJCOPY = avr-objcopy

OBJDUMP = avr-objdump

TARGETS += src/arch/arduino-nano/arch.cc

TARGETS += src/arch/arduino-nano/driver/gpio.cc

TARGETS += src/arch/arduino-nano/driver/stdout.cc

TARGETS += src/arch/arduino-nano/driver/uptime.cc

OBJECTS = ${TARGETS:.cc=.o}

.cc.o:

	${CXX} ${INCLUDES} ${COMMON_FLAGS} ${CXXFLAGS} -c -o $@ ${@:.o=.cc}

build/system.elf: ${OBJECTS}

	${CXX} ${COMMON_FLAGS} ${CXXFLAGS} -Wl,--gc-sections -o $@ ${OBJECTS}

build/system.hex: build/system.elf

	${OBJCOPY} -O ihex ${@:.hex=.elf} $@

program: build/system.hex

	avrdude -p ${MCU} -c arduino -P /dev/ttyUSB0 -b 57600 -U flash:w:build/system.hex

arch_clean:

	rm -f ${OBJECTS} build/system.hex

monitor:

	screen /dev/ttyUSB0 115200

.PHONY: arch_clean monitor program

#include "arch.h"

#include <avr/io.h>

#include <avr/interrupt.h>

void Arch::setup(void)

{

#ifdef TIMER_CYCLES

	TCCR0A = 0;

	TCCR0B = _BV(CS00);

#endif

#if defined(WITH_LOOP) || defined(TIMER_S)

	TCCR1A = 0;

	TCCR1B = _BV(WGM12) | _BV(CS12) | _BV(CS10); // /1024

	OCR1A = 15625;

	TIMSK1 = _BV(OCIE1A);

#endif

#ifdef TIMER_US

	// 16MHz/8 -> 2MHz timer

	TCCR2A = 0;

	TCCR2B = _BV(CS21);

#endif

	sei();

}

#if defined(WITH_LOOP) || defined(TIMER_S)

#include "driver/uptime.h"

extern void loop();

#endif

void Arch::idle_loop(void)

{

	while (1) {

		SMCR = _BV(SE);

		asm("sleep");

		SMCR = 0;

		asm("wdr");

#ifdef WITH_LOOP

		loop();

#endif

#ifdef TIMER_S

		uptime.tick_s();

#endif

	}

}

Arch arch;

#if defined(WITH_LOOP) || defined(TIMER_S)

ISR(TIMER1_COMPA_vect)

{

}

#endif