Initial commit: basic infrastructure

.gitignore

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+# Build results
+/bin
+/obj
+
+# Vim swap files
+.*.sw?
+
+# generated config HEX files
+utils/*.hex

.gitmodules

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+[submodule "fxplib"]
+	path = fxplib
+	url = https://github.com/cfr34k/fxplib.git
+[submodule "libopencm3"]
+	path = libopencm3
+	url = https://github.com/libopencm3/libopencm3.git

Makefile

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+# --- START OF CONFIG ---------------------------------------------------
+# Edit the following variables for your own needs
+
+# toolchain configuration
+PREFIX  ?= arm-none-eabi-
+CC       = $(PREFIX)gcc
+LD       = $(PREFIX)gcc
+OBJCOPY  = $(PREFIX)objcopy
+OBJDUMP  = $(PREFIX)objdump
+GDB      = $(PREFIX)gdb
+SIZE     = $(PREFIX)size
+
+OOCD = openocd
+OOCD_CFG = ./oocd/tinyfancontrol.cfg
+
+TOOLCHAIN_DIR ?= /usr/arm-none-eabi
+OPENCM3_DIR ?= ./libopencm3
+
+# default build configuration
+# "make BUILD=release" does a release build
+BUILD:=debug
+
+# basic build flags configuration
+CFLAGS+=-Wall -std=c99 -pedantic -Wextra -Wimplicit-function-declaration \
+        -Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes \
+        -Wundef -Wshadow \
+        -fno-common -ffunction-sections -fdata-sections -mcpu=cortex-m0 -mthumb \
+        -mfloat-abi=soft -MD -DSTM32L0
+
+LDFLAGS+=--static \
+         -L$(OPENCM3_DIR)/lib \
+         -nostartfiles -Wl,--gc-sections \
+         -mthumb -mcpu=cortex-m0 -mthumb -mfloat-abi=soft
+
+# the LD script (RAM-only does not work because the code is too large)
+#LDFLAGS+=-Tldscripts/tinyfancontrol-$(BUILD).ld
+LDFLAGS+=-Tldscripts/tinyfancontrol-release.ld
+
+# Flags for libopencm3
+CFLAGS+=-I$(OPENCM3_DIR)/include
+LDFLAGS+=-L$(OPENCM3_DIR)/lib -lopencm3_stm32l0
+
+# Flags for fxplib
+CFLAGS+=-Ifxplib/include -DPOINTPOS=16
+LDFLAGS+=-Lfxplib/lib/$(BUILD) -lfxp_stm32l0
+
+# generic linking
+LDFLAGS+=-Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group
+
+# build type specific flags
+CFLAGS_debug=-O0 -ggdb -DDEBUG
+LDFLAGS_debug=
+
+CFLAGS_release=-Os -ggdb
+LDFLAGS_release=
+
+# target configuration
+TARGET := tinyfancontrol
+VERSION := $(shell git describe --always)
+
+# source files for the project
+SOURCE := $(shell find src/ -name '*.c')
+INCLUDES := $(shell find src/ -name '*.h')
+
+# additional dependencies for build (proper targets must be specified by user)
+DEPS := build_libfxp
+
+# default target
+all: $(TARGET)
+
+# user-specific targets
+export CFLAGS
+export BUILD
+export PREFIX
+export POSTFIX = stm32l0
+build_libfxp:
+	cd fxplib && $(MAKE)
+
+# --- END OF CONFIG -----------------------------------------------------
+
+OBJ1=$(patsubst %.c, %.o, $(SOURCE))
+OBJ=$(patsubst src/%, obj/$(BUILD)/%, $(OBJ1))
+
+VERSIONSTR="\"$(VERSION)\""
+
+CFLAGS+=-DVERSION=$(VERSIONSTR)
+
+TARGET_BASE := bin/$(BUILD)/$(TARGET)
+
+CFLAGS+=$(CFLAGS_$(BUILD))
+LDFLAGS+=$(LDFLAGS_$(BUILD))
+
+.PHONY show_cflags:
+	@echo --- Build parameters:  ------------------------------------------
+	@echo CFLAGS\=$(CFLAGS)
+	@echo LDFLAGS\=$(LDFLAGS)
+	@echo SOURCE\=$(SOURCE)
+	@echo -----------------------------------------------------------------
+
+$(TARGET): show_cflags $(TARGET_BASE).elf $(TARGET_BASE).hex \
+	         $(TARGET_BASE).lss $(TARGET_BASE).bin
+	@$(SIZE) $(TARGET_BASE).elf
+	@echo ">>> $(BUILD) build complete."
+
+$(TARGET_BASE).elf: $(DEPS) $(OBJ) $(INCLUDES) Makefile
+	@echo Linking $@ ...
+	@mkdir -p $(shell dirname $@)
+	@$(LD) -o $(TARGET_BASE).elf $(OBJ) $(LDFLAGS)
+
+$(TARGET_BASE).hex: $(TARGET_BASE).elf
+	@echo "Generating $@ ..."
+	@$(OBJCOPY) -Oihex $< $@
+
+$(TARGET_BASE).bin: $(TARGET_BASE).elf
+	@echo "Generating $@ ..."
+	@$(OBJCOPY) -Obinary $< $@
+
+$(TARGET_BASE).lss: $(TARGET_BASE).elf
+	@echo "Generating $@ ..."
+	@$(OBJDUMP) -S $< > $@
+
+obj/$(BUILD)/%.o: src/%.c $(INCLUDES) Makefile
+	@echo "Compiling $< ..."
+	@mkdir -p $(shell dirname $@)
+	@$(CC) -c $(CFLAGS) -o $@ $<
+
+clean:
+	rm -f $(TARGET_BASE).elf
+	rm -f $(TARGET_BASE).hex
+	rm -f $(TARGET_BASE).lss
+	rm -f $(TARGET_BASE).bin
+	rm -f $(OBJ)
+
+program: program_jlink
+
+reset: reset_jlink
+
+/tmp/jlink_prog_script: Makefile
+	echo "Device STM32F030C8" > $@
+	echo "connect" >> $@
+	echo "S" >> $@
+	echo "4000" >> $@
+	echo "loadfile $(TARGET_BASE).hex" >> $@
+	echo "r" >> $@
+	echo "g" >> $@
+	echo "exit" >> $@
+
+/tmp/jlink_rst_script: Makefile
+	echo "Device STM32F030C8" > $@
+	echo "connect" >> $@
+	echo "S" >> $@
+	echo "4000" >> $@
+	echo "r" >> $@
+	echo "g" >> $@
+	echo "exit" >> $@
+
+program_jlink: /tmp/jlink_prog_script $(TARGET_BASE).hex
+	JLinkExe </tmp/jlink_prog_script
+
+reset_jlink: /tmp/jlink_rst_script
+	JLinkExe </tmp/jlink_rst_script
+
+program_release: $(TARGET_BASE).hex
+	$(OOCD) -f $(OOCD_CFG) \
+		-c "init" \
+		-c "reset halt" \
+		-c "flash write_image erase $(TARGET_BASE).hex" \
+		-c "resume 0x08000000" \
+		-c "shutdown"
+
+program_debug: $(TARGET_BASE).hex
+	$(OOCD) -f $(OOCD_CFG) \
+		-c "init" \
+		-c "reset halt" \
+		-c "load_image $(TARGET_BASE).hex" \
+		-c "resume `arm-none-eabi-readelf -h bin/debug/$(TARGET).elf | awk '/Entry/{print $$4;}'`" \
+		-c "shutdown"
+
+debug: $(TARGET_BASE).hex
+	JLinkGDBServerCLExe -device STM32F030K6 -if SWD

fxplib

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+Subproject commit 896464ee67bbbae82930c9c972e5267b97c7de6d

ldscripts/tinyfancontrol-debug.ld

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+/* Linker script for LNSC-2420: STM32F0K6T6*/
+
+/* This debug linker script places everything in RAM for fewer flash write
+ * cycles */
+
+/* Define memory regions. */
+MEMORY
+{
+	/*rom (rx) : ORIGIN = 0x08000000, LENGTH = 64K*/
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 8K
+}
+
+/* Include the common ld script. */
+/* INCLUDE libopencm3_stm32f4.ld */
+
+
+/* Generic linker script for STM32 targets using libopencm3. */
+
+/* Memory regions must be defined in the ld script which includes this one. */
+
+/* Enforce emmition of the vector table. */
+EXTERN (vector_table)
+
+/* Define the entry point of the output file. */
+ENTRY(reset_handler)
+
+/* Define sections. */
+SECTIONS
+{
+	.text : {
+		*(.vectors)	/* Vector table */
+		*(.text*)	/* Program code */
+		. = ALIGN(4);
+		*(.rodata*)	/* Read-only data */
+		. = ALIGN(4);
+	} >ram
+
+	/* C++ Static constructors/destructors, also used for __attribute__
+	 * ((constructor)) and the likes */
+	.preinit_array : {
+		. = ALIGN(4);
+		__preinit_array_start = .;
+		KEEP (*(.preinit_array))
+		__preinit_array_end = .;
+	} >ram
+	.init_array : {
+		. = ALIGN(4);
+		__init_array_start = .;
+		KEEP (*(SORT(.init_array.*)))
+		KEEP (*(.init_array))
+		__init_array_end = .;
+	} >ram
+	.fini_array : {
+		. = ALIGN(4);
+		__fini_array_start = .;
+		KEEP (*(.fini_array))
+		KEEP (*(SORT(.fini_array.*)))
+		__fini_array_end = .;
+	} >ram
+
+	/*
+	 * Another section used by C++ stuff, appears when using newlib with
+	 * 64bit (long long) printf support
+	 */
+	.ARM.extab : {
+		*(.ARM.extab*)
+	} >ram
+	.ARM.exidx : {
+		__exidx_start = .;
+		*(.ARM.exidx*)
+		__exidx_end = .;
+	} >ram
+
+	. = ALIGN(4);
+	_etext = .;
+
+	.data : {
+		_data = .;
+		*(.data*)	/* Read-write initialized data */
+		. = ALIGN(4);
+		_edata = .;
+	} >ram
+
+	.bss : {
+		*(.bss*)	/* Read-write zero initialized data */
+		*(COMMON)
+		. = ALIGN(4);
+		_ebss = .;
+	} >ram
+
+	/*
+	 * The .eh_frame section appears to be used for C++ exception handling.
+	 * You may need to fix this if you're using C++.
+	 */
+	/DISCARD/ : { *(.eh_frame) }
+
+	. = ALIGN(4);
+	end = .;
+}
+
+PROVIDE(_stack = ORIGIN(ram) + LENGTH(ram));
+
+

ldscripts/tinyfancontrol-release.ld

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+/* Linker script for LNSC-2420: STM32F0K6T6*/
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx)  : ORIGIN = 0x08000000, LENGTH = 64K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 8K
+}
+
+/* Include the common ld script. */
+INCLUDE cortex-m-generic.ld

libopencm3

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+Subproject commit 32a169207775d6c53c536d46b78ecf8eca3fdd18

src/main.c

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+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/cm3/systick.h>
+#include <libopencmsis/core_cm3.h>
+
+/* Set up systick to fire freq times per second */
+static void init_systick(int freq)
+{
+	systick_set_clocksource(STK_CSR_CLKSOURCE_AHB);
+	/* clear counter so it starts right away */
+	STK_CVR = 0;
+
+	systick_set_reload(rcc_ahb_frequency / freq);
+	systick_counter_enable();
+	systick_interrupt_enable();
+}
+
+
+int main(void)
+{
+	uint64_t timebase_ms = 0;
+
+	init_systick(1000);
+
+	//rs485_enqueue("LNSC-2420 v" VERSION " initialized.\n");
+
+	// triggered every 1 ms
+	while (1) {
+		__WFI();
+	}
+
+	return 0;
+}
+
+
+/* Called when systick fires */
+void sys_tick_handler(void)
+{
+	//wait_frame = 0;
+}
+
+
+void hard_fault_handler(void)
+{
+	while (1);
+}