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

15 files changed, 288 insertions, 0 deletions

diff --git a/src/arch/arduino-uno/Kconfig b/src/arch/arduino-uno/Kconfig
new file mode 100644
index 0000000..6904e65
--- /dev/null
+++ b/src/arch/arduino-uno/Kconfig
@@ -0,0 +1,80 @@
+# 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
diff --git a/src/arch/arduino-uno/Makefile.inc b/src/arch/arduino-uno/Makefile.inc
new file mode 100644
index 0000000..2a388a1
--- /dev/null
+++ b/src/arch/arduino-uno/Makefile.inc
@@ -0,0 +1,195 @@
+# 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
diff --git a/src/arch/arduino-uno/arch.cc b/src/arch/arduino-uno/arch.cc
new file mode 120000
index 0000000..808ad49
--- /dev/null
+++ b/src/arch/arduino-uno/arch.cc
@@ -0,0 +1 @@
+../arduino-nano/arch.cc
\ No newline at end of file
diff --git a/src/arch/arduino-uno/driver/adc.cc b/src/arch/arduino-uno/driver/adc.cc
new file mode 120000
index 0000000..2af9b2a
--- /dev/null
+++ b/src/arch/arduino-uno/driver/adc.cc
@@ -0,0 +1 @@
+../../arduino-nano/driver/adc.cc
\ No newline at end of file
diff --git a/src/arch/arduino-uno/driver/counter.cc b/src/arch/arduino-uno/driver/counter.cc
new file mode 120000
index 0000000..298b552
--- /dev/null
+++ b/src/arch/arduino-uno/driver/counter.cc
@@ -0,0 +1 @@
+../../arduino-nano/driver/counter.cc
\ No newline at end of file
diff --git a/src/arch/arduino-uno/driver/dmx.cc b/src/arch/arduino-uno/driver/dmx.cc
new file mode 120000
index 0000000..1fa663a
--- /dev/null
+++ b/src/arch/arduino-uno/driver/dmx.cc
@@ -0,0 +1 @@
+../../arduino-nano/driver/dmx.cc
\ No newline at end of file
diff --git a/src/arch/arduino-uno/driver/gpio.cc b/src/arch/arduino-uno/driver/gpio.cc
new file mode 120000
index 0000000..cfdbbcc
--- /dev/null
+++ b/src/arch/arduino-uno/driver/gpio.cc
@@ -0,0 +1 @@
+../../arduino-nano/driver/gpio.cc
\ No newline at end of file
diff --git a/src/arch/arduino-uno/driver/i2c.cc b/src/arch/arduino-uno/driver/i2c.cc
new file mode 120000
index 0000000..d31e7a1
--- /dev/null
+++ b/src/arch/arduino-uno/driver/i2c.cc
@@ -0,0 +1 @@
+../../arduino-nano/driver/i2c.cc
\ No newline at end of file
diff --git a/src/arch/arduino-uno/driver/neopixel.cc b/src/arch/arduino-uno/driver/neopixel.cc
new file mode 120000
index 0000000..fea98ca
--- /dev/null
+++ b/src/arch/arduino-uno/driver/neopixel.cc
@@ -0,0 +1 @@
+../../arduino-nano/driver/neopixel.cc
\ No newline at end of file
diff --git a/src/arch/arduino-uno/driver/spi.cc b/src/arch/arduino-uno/driver/spi.cc
new file mode 120000
index 0000000..16c9bf4
--- /dev/null
+++ b/src/arch/arduino-uno/driver/spi.cc
@@ -0,0 +1 @@
+../../arduino-nano/driver/spi.cc
\ No newline at end of file
diff --git a/src/arch/arduino-uno/driver/stdin.cc b/src/arch/arduino-uno/driver/stdin.cc
new file mode 120000
index 0000000..5b0e596
--- /dev/null
+++ b/src/arch/arduino-uno/driver/stdin.cc
@@ -0,0 +1 @@
+../../arduino-nano/driver/stdin.cc
\ No newline at end of file
diff --git a/src/arch/arduino-uno/driver/stdout.cc b/src/arch/arduino-uno/driver/stdout.cc
new file mode 120000
index 0000000..3d2bcb4
--- /dev/null
+++ b/src/arch/arduino-uno/driver/stdout.cc
@@ -0,0 +1 @@
+../../arduino-nano/driver/stdout.cc
\ No newline at end of file
diff --git a/src/arch/arduino-uno/driver/timer.cc b/src/arch/arduino-uno/driver/timer.cc
new file mode 120000
index 0000000..ccc5a3e
--- /dev/null
+++ b/src/arch/arduino-uno/driver/timer.cc
@@ -0,0 +1 @@
+../../arduino-nano/driver/timer.cc
\ No newline at end of file
diff --git a/src/arch/arduino-uno/driver/uptime.cc b/src/arch/arduino-uno/driver/uptime.cc
new file mode 120000
index 0000000..8961f79
--- /dev/null
+++ b/src/arch/arduino-uno/driver/uptime.cc
@@ -0,0 +1 @@
+../../arduino-nano/driver/uptime.cc
\ No newline at end of file
diff --git a/src/arch/arduino-uno/prompt b/src/arch/arduino-uno/prompt
new file mode 100644
index 0000000..02085ae
--- /dev/null
+++ b/src/arch/arduino-uno/prompt
@@ -0,0 +1 @@
+Arduino Uno