9 files changed, 296 insertions, 0 deletions
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..01bc084
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "libopencm3"]
+	path = ext/libopencm3
+	url = https://github.com/libopencm3/libopencm3.git
diff --git a/ext/libopencm3 b/ext/libopencm3
new file mode 160000
+Subproject 24bef9c49eda109e92e926e065b246a71d454f2
diff --git a/include/arch/stm32f446re-nucleo/driver/gpio.h b/include/arch/stm32f446re-nucleo/driver/gpio.h
new file mode 100644
index 0000000..378a84f
--- /dev/null
+++ b/include/arch/stm32f446re-nucleo/driver/gpio.h
@@ -0,0 +1,63 @@
+#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
diff --git a/include/arch/stm32f446re-nucleo/driver/stdout.h b/include/arch/stm32f446re-nucleo/driver/stdout.h
new file mode 100644
index 0000000..2eb669d
--- /dev/null
+++ b/include/arch/stm32f446re-nucleo/driver/stdout.h
@@ -0,0 +1,19 @@
+#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
diff --git a/src/arch/stm32f446re-nucleo/Makefile.inc b/src/arch/stm32f446re-nucleo/Makefile.inc
new file mode 100644
index 0000000..54792d3
--- /dev/null
+++ b/src/arch/stm32f446re-nucleo/Makefile.inc
@@ -0,0 +1,116 @@
+# 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
diff --git a/src/arch/stm32f446re-nucleo/arch.cc b/src/arch/stm32f446re-nucleo/arch.cc
new file mode 100644
index 0000000..12a612a
--- /dev/null
+++ b/src/arch/stm32f446re-nucleo/arch.cc
@@ -0,0 +1,54 @@
+#include "arch.h"
+
+#ifdef __acweaving
+#define __delay_cycles(x)
+#endif
+
+void Arch::setup(void)
+{
+}
+
+#ifdef WITH_WAKEUP
+extern void wakeup();
+#endif
+
+#if defined(WITH_LOOP)
+extern void loop();
+volatile char run_loop = 0;
+#endif
+
+void Arch::delay_us(unsigned int const us)
+{
+	volatile int x = us * 2;
+	while (x--) {
+		__asm("nop");
+	}
+}
+void Arch::delay_ms(unsigned int const ms)
+{
+	for (unsigned int i = 0; i < ms; i++) {
+		volatile int x = 2000;
+		while (x--) {
+			__asm("nop");
+		}
+	}
+}
+
+void Arch::idle_loop(void)
+{
+	while (1) {
+		delay_ms(1000);
+#ifdef WITH_LOOP
+		loop();
+#endif
+	}
+}
+
+void Arch::idle(void)
+{
+#ifdef WITH_WAKEUP
+	wakeup();
+#endif
+}
+
+Arch arch;
diff --git a/src/arch/stm32f446re-nucleo/driver/gpio.cc b/src/arch/stm32f446re-nucleo/driver/gpio.cc
new file mode 100644
index 0000000..1403aed
--- /dev/null
+++ b/src/arch/stm32f446re-nucleo/driver/gpio.cc
@@ -0,0 +1,3 @@
+#include "driver/gpio.h"
+
+GPIO gpio;
diff --git a/src/arch/stm32f446re-nucleo/driver/stdout.cc b/src/arch/stm32f446re-nucleo/driver/stdout.cc
new file mode 100644
index 0000000..2c20158
--- /dev/null
+++ b/src/arch/stm32f446re-nucleo/driver/stdout.cc
@@ -0,0 +1,31 @@
+#include "driver/stdout.h"
+
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/usart.h>
+
+void StandardOutput::setup()
+{
+	rcc_periph_clock_enable(RCC_USART2);
+	gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO2);
+	gpio_set_af(GPIOA, GPIO_AF7, GPIO2);
+
+	usart_set_baudrate(USART2, 115200);
+	usart_set_databits(USART2, 8);
+	usart_set_stopbits(USART2, USART_STOPBITS_1);
+	usart_set_mode(USART2, USART_MODE_TX);
+	usart_set_parity(USART2, USART_PARITY_NONE);
+	usart_set_flow_control(USART2, USART_FLOWCONTROL_NONE);
+
+	usart_enable(USART2);
+}
+
+void StandardOutput::put(char c)
+{
+	usart_send_blocking(USART2, c);
+	if (c == '\n') {
+		put('\r');
+	}
+}
+
+StandardOutput kout;
diff --git a/src/arch/stm32f446re-nucleo/stm32f446.ld b/src/arch/stm32f446re-nucleo/stm32f446.ld
new file mode 100644
index 0000000..d53b56e
--- /dev/null
+++ b/src/arch/stm32f446re-nucleo/stm32f446.ld
@@ -0,0 +1,7 @@
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 512K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 128K
+}
+
+INCLUDE ext/libopencm3/lib/cortex-m-generic.ld