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STM32F4 Examples

Some example programs of STM32F4 for beginners, where STM32F4DISCOVERY board is used.

Required platform:

• GNU/Linux
• GNU Arm Embedded Toolchain

Provided Examples

Peripheral manipulation examples:

• GPIO output (LED)
• GPIO input (button)
• PWM
• UART read / write with pooling
• UART write with DMA
• SysTick
• CRC
• Flash
• USB VCP (Virtual COM Port)

FreeRTOS examples:

• Task
• Semaphore
• Queue

Development Tools

1. Prerequisites:

sudo apt install build-essential git zlib1g-dev libsdl1.2-dev automake* autoconf* \
         libtool libpixman-1-dev lib32gcc1 lib32ncurses5 libc6:i386 libncurses5:i386 \
         libstdc++6:i386 libusb-1.0.0-dev ninja-build

2. OpenOCD:

git clone git://git.code.sf.net/p/openocd/code openocd
cd openocd
./bootstrap
./configure --prefix=/usr/local --enable-jlink --enable-amtjtagaccel --enable-buspirate \
            --enable-stlink --disable-libftdi
echo -e "all:\ninstall:" > doc/Makefile
make -j4
sudo make install

3. ARM GCC toolchain 9:

wget https://developer.arm.com/-/media/Files/downloads/gnu-rm/9-2019q4/gcc-arm-none-eabi-9-2019-q4-major-x86_64-linux.tar.bz2
tar jxf ./gcc-arm-none-eabi-9-2019-q4-major-x86_64-linux.tar.bz2
rm gcc-arm-none-eabi-9-2019-q4-major-x86_64-linux.tar.bz2

4. QEMU:

git clone git://git.qemu.org/qemu.git
cd qemu
git submodule init
git submodule update --recursive
mkdir build
cd build
../configure
make -j $(nproc)

5. Edit ~/.bashrc and append the following instructions:

PATH=$PATH:${YOUR_PATH}/qemu/build
PATH=$PATH:${YOUR_PATH}/gcc-arm-none-eabi-9-2019-q4-major/bin

6. Restart the terminal

Build and run

1. Build:

make

2. Upload binary:

make flash

3. To observe the UART examples, type:

sudo screen /dev/ttyUSB0 9600

Troubleshooting

Resolve premission denied error of the GNU screen:

sudo gpasswd --add username dialout

References

• NCKU Wikipedia: http://wiki.csie.ncku.edu.tw/embedded/Lab25