From e9e8b7118d3e23bfbe3da61e09c52da185680ab0 Mon Sep 17 00:00:00 2001 From: Imbus <> Date: Tue, 15 Jul 2025 18:29:06 +0200 Subject: [PATCH] Init --- .gitignore | 6 ++ .gitmodules | 3 + Makefile | 17 +++++ main.c | 32 ++++++++++ rules.mk | 177 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 235 insertions(+) create mode 100644 .gitignore create mode 100644 .gitmodules create mode 100644 Makefile create mode 100644 main.c create mode 100644 rules.mk diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..1c3c380 --- /dev/null +++ b/.gitignore @@ -0,0 +1,6 @@ +bin/ +.cache +*.elf +*.bin +generated.*.ld +compile_commands.json diff --git a/.gitmodules b/.gitmodules new file mode 100644 index 0000000..6bccd68 --- /dev/null +++ b/.gitmodules @@ -0,0 +1,3 @@ +[submodule "libopencm3"] + path = libopencm3 + url = https://github.com/libopencm3/libopencm3 diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..a533403 --- /dev/null +++ b/Makefile @@ -0,0 +1,17 @@ +PROJECT = main +BUILD_DIR = bin + +CFILES = main.c + +# TODO - you will need to edit these two lines! +DEVICE=STM32F103C6 +# OOCD_FILE = board/stm32f4discovery.cfg + +# You shouldn't have to edit anything below here. +# VPATH += $(SHARED_DIR) +INCLUDES += $(patsubst %,-I%, . $(SHARED_DIR)) +OPENCM3_DIR=./libopencm3 + +include $(OPENCM3_DIR)/mk/genlink-config.mk +include ./rules.mk +include $(OPENCM3_DIR)/mk/genlink-rules.mk diff --git a/main.c b/main.c new file mode 100644 index 0000000..f821803 --- /dev/null +++ b/main.c @@ -0,0 +1,32 @@ +#include +#include + +static void clock_setup(void) { + // Use external 8 MHz HSE and PLL to 72 MHz + rcc_clock_setup_pll(&rcc_hse_configs[RCC_CLOCK_HSE8_72MHZ]); + rcc_periph_clock_enable(RCC_GPIOC); +} + +static void gpio_setup(void) { + // gpio_mode_setup(GPIOC, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO13); + gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, + GPIO13); +} + +static void delay(volatile uint32_t count) { + while (count-- > 0) { + __asm__("nop"); + } +} + +int main(void) { + clock_setup(); + gpio_setup(); + + while (1) { + gpio_toggle(GPIOC, GPIO13); // On Blue Pill: LED is on PC13 + delay(10000000); // Crude delay loop + } + + return 0; +} diff --git a/rules.mk b/rules.mk new file mode 100644 index 0000000..e417d2f --- /dev/null +++ b/rules.mk @@ -0,0 +1,177 @@ +# This version of rules.mk expects the following to be defined before +# inclusion.. +### REQUIRED ### +# OPENCM3_DIR - duh +# PROJECT - will be the basename of the output elf, eg usb-gadget0-stm32f4disco +# CFILES - basenames only, eg main.c blah.c +# CXXFILES - same for C++ files. Must have cxx suffix! +# DEVICE - the full device name, eg stm32f405ret6 +# _or_ +# LDSCRIPT - full path, eg ../../examples/stm32/f4/stm32f4-discovery/stm32f4-discovery.ld +# OPENCM3_LIB - the basename, eg: opencm3_stm32f4 +# OPENCM3_DEFS - the target define eg: -DSTM32F4 +# ARCH_FLAGS - eg, -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 +# (ie, the full set of cpu arch flags, _none_ are defined in this file) +# +### OPTIONAL ### +# INCLUDES - fully formed -I paths, if you want extra, eg -I../shared +# BUILD_DIR - defaults to bin, should set this if you are building multiarch +# OPT - full -O flag, defaults to -Os +# CSTD - defaults -std=c99 +# CXXSTD - no default. +# OOCD_INTERFACE - eg stlink-v2 +# OOCD_TARGET - eg stm32f4x +# both only used if you use the "make flash" target. +# OOCD_FILE - eg my.openocd.cfg +# This overrides interface/target above, and is used as just -f FILE +### TODO/FIXME/notes ### +# No support for stylecheck. +# No support for BMP/texane/random flash methods, no plans either +# No support for magically finding the library. +# C++ hasn't been actually tested with this..... sorry bout that. ;) +# Second expansion/secondary not set, add this if you need them. + +BUILD_DIR ?= bin +OPT ?= -Os +CSTD ?= -std=c99 + +# Be silent per default, but 'make V=1' will show all compiler calls. +# If you're insane, V=99 will print out all sorts of things. +V?=0 +ifeq ($(V),0) +Q := @ +NULL := 2>/dev/null +endif + +# Tool paths. +PREFIX ?= arm-none-eabi- +CC = $(PREFIX)gcc +CXX = $(PREFIX)g++ +LD = $(PREFIX)gcc +OBJCOPY = $(PREFIX)objcopy +OBJDUMP = $(PREFIX)objdump +OOCD ?= openocd + +OPENCM3_INC = $(OPENCM3_DIR)/include + +# Inclusion of library header files +INCLUDES += $(patsubst %,-I%, . $(OPENCM3_INC) ) + +OBJS = $(CFILES:%.c=$(BUILD_DIR)/%.o) +OBJS += $(CXXFILES:%.cxx=$(BUILD_DIR)/%.o) +OBJS += $(AFILES:%.S=$(BUILD_DIR)/%.o) +GENERATED_BINS = $(PROJECT).elf $(PROJECT).bin $(PROJECT).map $(PROJECT).list $(PROJECT).lss + +TGT_CPPFLAGS += -MD +TGT_CPPFLAGS += -Wall -Wundef $(INCLUDES) +TGT_CPPFLAGS += $(INCLUDES) $(OPENCM3_DEFS) + +TGT_CFLAGS += $(OPT) $(CSTD) -ggdb3 +TGT_CFLAGS += $(ARCH_FLAGS) +TGT_CFLAGS += -fno-common +TGT_CFLAGS += -ffunction-sections -fdata-sections +TGT_CFLAGS += -Wextra -Wshadow -Wno-unused-variable -Wimplicit-function-declaration +TGT_CFLAGS += -Wredundant-decls -Wstrict-prototypes -Wmissing-prototypes + +TGT_CXXFLAGS += $(OPT) $(CXXSTD) -ggdb3 +TGT_CXXFLAGS += $(ARCH_FLAGS) +TGT_CXXFLAGS += -fno-common +TGT_CXXFLAGS += -ffunction-sections -fdata-sections +TGT_CXXFLAGS += -Wextra -Wshadow -Wredundant-decls -Weffc++ + +TGT_ASFLAGS += $(OPT) $(ARCH_FLAGS) -ggdb3 + +TGT_LDFLAGS += -T$(LDSCRIPT) -L$(OPENCM3_DIR)/lib -nostartfiles +TGT_LDFLAGS += $(ARCH_FLAGS) +TGT_LDFLAGS += -specs=nano.specs +TGT_LDFLAGS += -Wl,--gc-sections +# OPTIONAL +#TGT_LDFLAGS += -Wl,-Map=$(PROJECT).map +ifeq ($(V),99) +TGT_LDFLAGS += -Wl,--print-gc-sections +endif + +# Linker script generator fills this in for us. +ifeq (,$(DEVICE)) +LDLIBS += -l$(OPENCM3_LIB) +endif +# nosys is only in newer gcc-arm-embedded... +#LDLIBS += -specs=nosys.specs +LDLIBS += -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group + +# Burn in legacy hell fortran modula pascal yacc idontevenwat +.SUFFIXES: +.SUFFIXES: .c .S .h .o .cxx .elf .bin .list .lss + +# Bad make, never *ever* try to get a file out of source control by yourself. +%: %,v +%: RCS/%,v +%: RCS/% +%: s.% +%: SCCS/s.% + +all: $(PROJECT).elf $(PROJECT).bin +flash: $(PROJECT).flash + +# error if not using linker script generator +ifeq (,$(DEVICE)) +$(LDSCRIPT): +ifeq (,$(wildcard $(LDSCRIPT))) + $(error Unable to find specified linker script: $(LDSCRIPT)) +endif +else +# if linker script generator was used, make sure it's cleaned. +GENERATED_BINS += $(LDSCRIPT) +endif + +# Need a special rule to have a bin dir +$(BUILD_DIR)/%.o: %.c + @printf " CC\t$<\n" + @mkdir -p $(dir $@) + $(Q)$(CC) $(TGT_CFLAGS) $(CFLAGS) $(TGT_CPPFLAGS) $(CPPFLAGS) -o $@ -c $< + +$(BUILD_DIR)/%.o: %.cxx + @printf " CXX\t$<\n" + @mkdir -p $(dir $@) + $(Q)$(CXX) $(TGT_CXXFLAGS) $(CXXFLAGS) $(TGT_CPPFLAGS) $(CPPFLAGS) -o $@ -c $< + +$(BUILD_DIR)/%.o: %.S + @printf " AS\t$<\n" + @mkdir -p $(dir $@) + $(Q)$(CC) $(TGT_ASFLAGS) $(ASFLAGS) $(TGT_CPPFLAGS) $(CPPFLAGS) -o $@ -c $< + +$(PROJECT).elf: $(OBJS) $(LDSCRIPT) $(LIBDEPS) + @printf " LD\t$@\n" + $(Q)$(LD) $(TGT_LDFLAGS) $(LDFLAGS) $(OBJS) $(LDLIBS) -o $@ + +%.bin: %.elf + @printf " OBJCOPY\t$@\n" + $(Q)$(OBJCOPY) -O binary $< $@ + +%.lss: %.elf + $(OBJDUMP) -h -S $< > $@ + +%.list: %.elf + $(OBJDUMP) -S $< > $@ + +%.flash: %.elf + @printf " FLASH\t$<\n" +ifeq (,$(OOCD_FILE)) + $(Q)(echo "halt; program $(realpath $(*).elf) verify reset" | nc -4 localhost 4444 2>/dev/null) || \ + $(OOCD) -f interface/$(OOCD_INTERFACE).cfg \ + -f target/$(OOCD_TARGET).cfg \ + -c "program $(realpath $(*).elf) verify reset exit" \ + $(NULL) +else + $(Q)(echo "halt; program $(realpath $(*).elf) verify reset" | nc -4 localhost 4444 2>/dev/null) || \ + $(OOCD) -f $(OOCD_FILE) \ + -c "program $(realpath $(*).elf) verify reset exit" \ + $(NULL) +endif + +clean: + rm -rf $(BUILD_DIR) $(GENERATED_BINS) + +.PHONY: all clean flash +-include $(OBJS:.o=.d) +