Difference between revisions of "Setting up a C++ Toolchain for STM32 Microcontrollers"
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# libopencm3 must be installed and compiled first! | # libopencm3 must be installed and compiled first! | ||
LIBOPENCM3_DIR=../../libopencm3 | LIBOPENCM3_DIR=../../libopencm3 | ||
+ | |||
CXX=arm-none-eabi-g++ | CXX=arm-none-eabi-g++ | ||
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%.elf: %.o | %.elf: %.o | ||
− | + | ${CXX} ${CXXFLAGS} $< ${LDFLAGS} -o $@ | |
clean: | clean: | ||
− | + | rm -f *.o *.elf | |
</source> | </source> | ||
− | (Note that, in the above Makefile, indentations are '''tab characters''', not spaces.) | + | (Note that, in the above Makefile, some indentations are '''tab characters''', not spaces.) |
Revision as of 14:23, 19 April 2020
Much of this guide is in great debt to the 1bitsy and libopencm3 projects.
Background
C++ offers the flexibility of object oriented programming, a bump over C when it comes to working with microcontrollers.
Setup
On Ubuntu, install the arm compiler with:
sudo apt-get install gcc-arm-embedded
On other systems, you can download it manually from the Arm Developer webpage.
Clone/Download libopencm3.
Compile libopencm3. Depending on your architecture, you may need to add additional specs to ask for hardware-based floating point arithmetic, but Cortex M4 defaults to using it if you simply invoke make
with no arguments.
Write some code! When youre ready, you can compile it with a simple makefile like this one:
# libopencm3 must be installed and compiled first!
LIBOPENCM3_DIR=../../libopencm3
CXX=arm-none-eabi-g++
CXXFLAGS=-g3 -mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16 \
--specs=rdimon.specs -I$(LIBOPENCM3_DIR)/include -DSTM32F4 -nostartfiles \
-std=c++11
LDFLAGS=-L$(LIBOPENCM3_DIR)/lib -Wl,-T,1bitsy.ld -lopencm3_stm32f4
all: encoder_example.elf
%.elf: %.o
${CXX} ${CXXFLAGS} $< ${LDFLAGS} -o $@
clean:
rm -f *.o *.elf
(Note that, in the above Makefile, some indentations are tab characters, not spaces.)