Add minimal STM32F446RE Nucleo support. No interrupts yet.

[submodule "libopencm3"]

	path = ext/libopencm3

	url = https://github.com/libopencm3/libopencm3.git

Subproject commit 24bef9c49eda109e92e926e065b246a71d454f2d

#ifndef GPIO_H

#define GPIO_H

#include <libopencm3/stm32/rcc.h>

#include <libopencm3/stm32/gpio.h>

class GPIO {

	private:

		GPIO(const GPIO &copy);

	public:

		GPIO () {}

		enum Pin : unsigned char {

			pa_0 = 0, pa_1, pa_2, pa_3, pa_4, pa_5, pa_6, pa_7,

			pa_8, pa_9, pa_10, pa_11, pa_12, pa_13, pa_14, pa_15,

			pb_0, pb_1, pb_2, pb_3, pb_4, pb_5, pb_6, pb_7,

			pb_8, pb_9, pb_10, pb_11, pb_12, pb_13, pb_14, pb_15,

			pc_0, pc_1, pc_2, pc_3, pc_4, pc_5, pc_6, pc_7,

			pc_8, pc_9, pc_10, pc_11, pc_12, pc_13, pc_14, pc_15,

			PIN_INVALID

		};

		inline void setup() {

			rcc_periph_clock_enable(RCC_GPIOA);

			rcc_periph_clock_enable(RCC_GPIOB);

			rcc_periph_clock_enable(RCC_GPIOC);

			// Set LED as output

			gpio_mode_setup(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO5);

		}

#pragma GCC diagnostic ignored "-Wunused-parameter"

		inline void led_on(unsigned char id) {

			gpio_set(GPIOA, GPIO5);

		}

		inline void led_off(unsigned char id) {

			gpio_clear(GPIOA, GPIO5);

		}

		inline void led_toggle(unsigned char id) {

			gpio_toggle(GPIOA, GPIO5);

		}

#pragma GCC diagnostic pop

		/*

		inline void input(unsigned char const pin) {

		}

		inline void input(unsigned char const pin, unsigned char const pull) {

		}

		inline void output(unsigned char const pin) {

		}

		inline void output(unsigned char const pin, unsigned char const value) {

		}

		inline unsigned char read(unsigned char const pin) {

		}

		inline void write(unsigned char const pin, unsigned char value) {

		}

		inline void write_mask(unsigned char const pin_base, unsigned char set_mask, unsigned char clear_mask) {

		}

		*/

};

extern GPIO gpio;

#endif

#ifndef STANDARDOUTPUT_H

#define STANDARDOUTPUT_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

# vim:ft=make

SERIAL_PORT ?= ttyACM0

INCLUDES += -Iext/libopencm3/include

COMMON_FLAGS += --static -nostartfiles -g3 -Os -fno-common

COMMON_FLAGS += -ffunction-sections -fdata-sections

COMMON_FLAGS += -mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16 -DSTM32F4

CC = arm-none-eabi-gcc

CXX = arm-none-eabi-g++

OBJCOPY = arm-none-eabi-objcopy

OBJDUMP = arm-none-eabi-objdump

CXX_TARGETS += src/arch/stm32f446re-nucleo/arch.cc

ifeq (${aspectc}, 1)

	CXX = ag++ -r build/repo.acp -v 0 --c_compiler arm-none-eabi-g++ -p . --Xcompiler

endif

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

	CXX_TARGETS += src/arch/stm32f446re-nucleo/driver/adc.cc

endif

CXX_TARGETS += src/arch/stm32f446re-nucleo/driver/gpio.cc

CXX_TARGETS += src/arch/stm32f446re-nucleo/driver/stdout.cc

#CXX_TARGETS += src/arch/stm32f446re-nucleo/driver/uptime.cc

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

	CXX_TARGETS += src/arch/stm32f446re-nucleo/driver/stdin.cc

endif

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

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

	CXX_TARGETS += src/arch/stm32f446re-nucleo/driver/i2c.cc

	COMMON_FLAGS += -DDRIVER_I2C

endif

ifneq ($(findstring spi_a1,${arch_drivers}), )

	CXX_TARGETS += src/arch/stm32f446re-nucleo/driver/spi_a1.cc

endif

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

	CXX_TARGETS += src/arch/stm32f446re-nucleo/driver/spi_b.cc

endif

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

	CXX_TARGETS += src/arch/stm32f446re-nucleo/driver/timer.cc

endif

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

	CXX_TARGETS += src/arch/stm32f446re-nucleo/driver/counter.cc

endif

OBJECTS = ${CXX_TARGETS:.cc=.o} ${C_TARGETS:.c=.o} ${ASM_TARGETS:.S=.o}

.cc.o:

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

.c.o:

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

.S.o:

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

.s.o:

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

# deliberately no ${MAKE} here -- multipass relies on make -B, but we don't

# want to re-make libopencm3 all the time

ext/libopencm3/lib/libopencm3_stm32f4.a: ext/libopencm3/Makefile

	git submodule update --init

	${MAKE} -C ext/libopencm3

build/system.elf: ${OBJECTS} ext/libopencm3/lib/libopencm3_stm32f4.a

	${QUIET}mkdir -p build

	${QUIET}${CXX} ${INCLUDES} ${COMMON_FLAGS} ${CXXFLAGS} \

		-Lext/libopencm3/lib -Wl,--gc-sections \

		-Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group \

		-T src/arch/stm32f446re-nucleo/stm32f446.ld \

		${OBJECTS} -lopencm3_stm32f4 \

		-o $@

program: build/system.elf

	openocd -c 'source [find interface/stlink-v2-1.cfg]' \

		-c 'transport select hla_swd' -c 'source [find target/stm32f4x.cfg]' \

		-c 'reset_config srst_only' -c '$$_TARGETNAME configure -rtos auto' \

		-c 'reset_config connect_assert_srst' -c init -c targets \

		-c 'reset halt' -c 'flash write_image erase "build/system.elf" 0' \

		'verify_image "build/system.elf" 0' -c 'reset run' -c 'shutdown'

arch_clean:

	${QUIET}rm -f ${OBJECTS}

monitor:

	${QUIET}screen /dev/${SERIAL_PORT} 115200

arch_help:

	@echo "stm32f446re-nucleo specific flags:"

	@echo "    DEBUG_PORT = ${DEBUG_PORT}"

	@echo "    SERIAL_PORT = ${SERIAL_PORT}"

	@echo "    cpu_freq = ${cpu_freq} (desired CPU frequency in Hz)"

	@echo "        supported frequencies: 1 / 4 / 8 / 16 MHz"

	@echo "    MSP430_FLASHER_DIR = /home/derf/var/projects/msp430/MSP430Flasher_1.3.7"

	@echo "        (required for flashing, must contain libmsp430.so and MSP430Flasher)"

arch_info:

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

	@echo "Timer Freq: ${timer_freq} Hz -> $(shell src/arch/stm32f446re-nucleo/model.py f_timer "${cpu_freq}" "${timer_freq}")"

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

	@echo "Counter Overflow: 65536/255"

	@echo "Monitor: /dev/${SERIAL_PORT} 115200"

.PHONY: arch_clean arch_help arch_info monitor program