Add Arduino Uno support (≙ Arduino Nano, except for flasher)

* I²C controller

### ATMega168P, ATMega328P (Arduino Nano)

### ATMega168P, ATMega328P (Arduino Nano, Arduino Uno)

Peripheral communication:

arduino-nano

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# Copyright 2026 Birte Kristina Friesel

#

# SPDX-License-Identifier: CC0-1.0

config arch_arduino_uno_cpufreq

int "CPU Frequency"

#!accept [62500, 125000, 250000, 500000, 1000000, 2000000, 4000000, 8000000, 16000000]

range 62500 16000000

default 16000000

help

  Assumes an externel 16MHz crystal to be present

  Must be one of 62500, 125000, 250000, 500000, 1000000, 2000000, 4000000, 8000000, 16000000.

config arch_arduino_uno_driver_adc

bool "ADC on PC<0-5>"

help

  ADC0: PC0

  ADC1: PC1

  ADC2: PC2

  ADC3: PC3

  ADC4: PC4

  ADC5: PC5

  ADC6: ---

  ADC7: ---

select meta_driver_adc

config arch_arduino_uno_driver_i2c

bool "I²C on PC[45]"

help

  SDA: PC4

  SCL: PC5

select meta_driver_hardware_i2c

select meta_driver_i2c

config arch_arduino_uno_driver_neopixel

bool "WS2812b (NeoPixel)"

select meta_driver_neopixel

config arch_arduino_uno_driver_spi

bool "SPI on PB[2345]"

help

  SS: PB2

  MOSI: PB3

  MISO: PB4

  SCK: PB5

select meta_driver_spi

config arch_arduino_uno_driver_stdin

bool "UART Input on PD0"

help

  RX: PD0 (USB)

select meta_driver_stdin

config arch_arduino_uno_driver_timer

bool "Timer with Interrupts"

select meta_driver_timer

config arch_arduino_uno_driver_dmx

bool "DMX"

select meta_driver_dmx

config arch_arduino_uno_driver_dmx_pin

string "DMX Pin"

default "pb5"

depends on arch_arduino_uno_driver_dmx

choice arch_arduino_uno_timer1

bool "Timer 1"

optional

config arch_arduino_uno_driver_uptime

bool "Uptime Counter"

select meta_driver_uptime

config arch_arduino_uno_driver_counter

bool "Cycle Counter"

select meta_driver_counter

endchoice

# vim:ft=make

#

# Copyright 2020 Birte Kristina Friesel

#

# SPDX-License-Identifier: BSD-2-Clause

MCU = atmega328p

SERIAL_PORT ?= /dev/ttyACM0

BAUD = 115200

ifdef CONFIG_arch_arduino_uno_cpufreq

	cpu_freq = ${CONFIG_arch_arduino_uno_cpufreq}

endif

cpu_freq ?= 16000000

COMMON_FLAGS += -Werror=overflow

COMMON_FLAGS += -mmcu=${MCU} -DMULTIPASS_ARCH_arduino_uno

COMMON_FLAGS += -DF_CPU=${cpu_freq}UL

COMMON_FLAGS += -DHAVE_PROGMEM

ifeq (${stack_usage}, )

	COMMON_FLAGS += -flto

endif

CC = avr-gcc

CXX = avr-g++

NM = avr-nm

OBJCOPY = avr-objcopy

OBJDUMP = avr-objdump

ARCH_SHORTNAME = avr

ifdef CONFIG_aspectc

	CXX = ag++ -r build/repo.acp -v 0 --c_compiler avr-g++ -p . --Xcompiler

endif

CXX_TARGETS += src/arch/arduino-uno/arch.cc

CXX_TARGETS += src/arch/arduino-uno/driver/gpio.cc

CXX_TARGETS += src/arch/arduino-uno/driver/stdout.cc

# Command-line driver selection

ifneq ($(findstring softi2c,${drivers}), )

else ifneq ($(findstring i2c,${arch_drivers}), )

	CONFIG_arch_arduino_uno_driver_i2c = y

endif

ifneq ($(findstring adc,${arch_drivers}), )

	CONFIG_arch_arduino_uno_driver_adc = y

endif

ifneq ($(findstring spi,${arch_drivers}), )

	CONFIG_arch_arduino_uno_driver_spi = y

endif

ifneq ($(findstring stdin,${arch_drivers}), )

	CONFIG_arch_arduino_uno_driver_stdin = y

endif

ifneq ($(findstring timer,${arch_drivers}), )

	CONFIG_arch_arduino_uno_driver_timer = y

endif

ifneq ($(findstring counter,${arch_drivers}), )

	CONFIG_arch_arduino_uno_driver_counter = y

endif

ifneq ($(findstring neopixel,${arch_drivers}), )

	CONFIG_arch_arduino_uno_driver_neopixel = y

endif

ifeq (${timer_s}, 1)

	CONFIG_arch_arduino_uno_driver_uptime = y

endif

# Kconfig driver selection

ifdef CONFIG_arch_arduino_uno_driver_i2c

	CXX_TARGETS += src/arch/arduino-uno/driver/i2c.cc

endif

ifdef CONFIG_arch_arduino_uno_driver_adc

	CXX_TARGETS += src/arch/arduino-uno/driver/adc.cc

endif

ifdef CONFIG_arch_arduino_uno_driver_dmx

	CXX_TARGETS += src/arch/arduino-uno/driver/dmx.cc

endif

ifdef CONFIG_arch_arduino_uno_driver_spi

	CXX_TARGETS += src/arch/arduino-uno/driver/spi.cc

endif

ifdef CONFIG_arch_arduino_uno_driver_stdin

	CXX_TARGETS += src/arch/arduino-uno/driver/stdin.cc

endif

ifdef CONFIG_arch_arduino_uno_driver_timer

	CXX_TARGETS += src/arch/arduino-uno/driver/timer.cc

endif

ifdef CONFIG_arch_arduino_uno_driver_counter

	CXX_TARGETS += src/arch/arduino-uno/driver/counter.cc

endif

ifdef CONFIG_arch_arduino_uno_driver_neopixel

	CXX_TARGETS += src/arch/arduino-uno/driver/neopixel.cc

endif

ifdef CONFIG_arch_arduino_uno_driver_uptime

	COMMON_FLAGS += -DTIMER_S

	CXX_TARGETS += src/arch/arduino-uno/driver/uptime.cc

endif

ifeq (${cpu_freq}, 16000000)

	uart_baud = 57600

else ifeq (${cpu_freq}, 8000000)

	uart_baud = 38400

else ifeq (${cpu_freq}, 4000000)

	uart_baud = 38400

else ifeq (${cpu_freq}, 2000000)

	uart_baud = 19200

else ifeq (${cpu_freq}, 1000000)

	uart_baud = 9600

else ifeq (${cpu_freq}, 500000)

	uart_baud = 4800

else ifeq (${cpu_freq}, 250000)

	uart_baud = 2400

else ifeq (${cpu_freq}, 125000)

	uart_baud = 1200

else ifeq (${cpu_freq}, 62500)

	uart_baud = 300

else

	uart_baud = 9600

endif

COMMON_FLAGS += -DBAUD=${uart_baud}UL

OBJECTS = ${SO_TARGETS:.a=.so} ${CXX_TARGETS:.cc=.o} ${C_TARGETS:.c=.o}

%.o : %.cc | include/config.h

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

%.o : %.c | include/config.h

	${QUIET}${CC} ${INCLUDES} ${COMMON_FLAGS} ${CFLAGS} -c -o $@ ${@:.o=.c}

%.so : %.a | include/config.h

	${QUIET}${CC} ${COMMON_FLAGS} -o $@ -Wl,--whole-archive ${@:.so=.a} -Wl,--no-whole-archive

build/system.elf: ${OBJECTS}

	${QUIET}mkdir -p build

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

	${QUIET}avr-size --format=avr --mcu=${MCU} $@

	${QUIET}test $$(avr-size --format=avr --mcu=${MCU} build/system.elf | fgrep Program | grep -o '[0-9.]*%' | cut -d . -f 1) -lt 100

build/system.hex: build/system.elf

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

program: build/system.hex

	${QUIET}avrdude -p ${MCU} -c arduino -P ${SERIAL_PORT} -b ${BAUD} -U flash:w:build/system.hex

arch_clean:

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

cat:

	${QUIET}script/cat.py ${SERIAL_PORT} ${uart_baud} ${cpu_freq} 65536

monitor:

	${QUIET}screen ${SERIAL_PORT} ${uart_baud}

size: build/system.elf

	${QUIET}avr-size --format=avr --mcu=atmega328p build/system.elf | fgrep Program | perl -nE 'if (m{(\d+) bytes \(([0-9.]+%)}) { print("$$1;$$2;") }'

	${QUIET}avr-size --format=avr --mcu=atmega328p build/system.elf | fgrep Data | perl -nE 'if (m{(\d+) bytes \(([0-9.]+%)}) { print("$$1;$$2;") }'

	${QUIET}echo

arch_help:

	@echo "arduino-uno specific flags:"

	@echo " SERIAL_PORT = ${SERIAL_PORT}"

	@echo "        BAUD = ${BAUD} (only used for programming)"

arch_info:

	@echo "CPU   Freq: ${cpu_freq} Hz"

	@echo "Timer Freq: ${timer_freq} Hz"

	@echo "I2C   Freq: ${i2c_freq} Hz"

	@echo "Counter Overflow: 65536/255"

	@echo "Monitor: ${SERIAL_PORT} ${uart_baud}"

attributes: build/system.elf

	${QUIET}script/size.py avr-size text,data data,bss

nfpvalues: build/system.elf

	${QUIET}script/nfpvalues.py avr-size text,data data,bss

.PHONY: arch_clean arch_help arch_info attributes cat monitor program size

../arduino-nano/arch.cc

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