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---------------------
ledcontrol / firmware
---------------------
This folder contains the firmware for the ledcontrol project. It assumes a
STM32F103C8T6 microcontroller.
Usage
-----
Install the necessary software. For Arch Linux this works like this:
sudo pacman -S \
base-devel \
arm-none-eabi-binutils \
arm-none-eabi-gcc \
arm-none-eabi-gdb \
arm-none-eabi-newlib
Clone this repository with all Git submodules:
git clone --recurse-submodules https://cgit.xengineering.eu/ledcontrol
Enter the repository and build the software:
cd ledcontrol/firmware
make
Connect your STM32F103C8T6 with an STLINK V2 debugger and flash the firmware:
./ocd.sh
# switch to a second terminal in the same folder
./gdb.sh build/ledcontrol.elf
load
run
# CTRL + C will stop the execution
# leave GDB with CTRL + D
Mention that you do not have to quit GDB to upload new compiled firmware. Just
call `load` and `run` again.
Upload firmware via serial bootloader
-------------------------------------
STM32 microcontrollers have a built-in serial bootloader to flash firmware. It
is activated if pin BOOT0 is pulled to 3.3 V, BOOT1 to 0 V (GND) and the
microcontroller is restarted. In this state it is possible to flash firmware
with just a USB to serial adapter via USART1 (PA9 and PA10). This works with a
FTDI USB to UART adapter (3.3 V TTL logic and 5 V VCC).
To upload a *.bin firmware to the MCU just follow these steps. You will need to
install the stm32flash utility (maybe via AUR):
- connect:
- GND (UART adapter) to GND (MCU)
- RX (UART adapter, yellow in my case) to PA9 (MCU)
- TX (UART adapter, orange in my case) to PA10 (MCU)
- VCC (UART adapter) to VCC (MCU) just if no other power source is
connected!
- set BOOT0 to 1 (3.3 V) and BOOT1 to 0 (GND)
- reboot MCU
- flash firmware with stm32flash
To flash and verify `firmware.bin` via `/dev/ttyUSB0` use this command:
stm32flash -w firmware.bin -v /dev/ttyUSB0
It can then be started with:
stm32flash -g 0x0 /dev/ttyUSB0
For further details run `man stm32flash`.
External References
-------------------
- tutorial about C programs on bare-metal ARM chips:
https://jacobmossberg.se/posts/2018/08/11/run-c-program-bare-metal-on-arm-cortex-m3.html
- tutorial about STM32 programming with libopencm3:
https://www.rhye.org/post/stm32-with-opencm3-0-compiling-and-uploading/
- PWM example from the libopencm3 project:
https://github.com/libopencm3/libopencm3-examples/blob/master/examples/stm32/f1/obldc/pwmleds/pwmleds.c
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