HW's STM32 projects
-------------------
I bought a bunch of STM32F103 development boards in China for about
2 EUR per item (containing the microcontroller, a 8MHz Quarz, 32kHz
oscillator for RTC, USB jack, LTO, jumpers for BOOT0/1 and a reset
button. They make a great experimental platform. Here I collect
projects I created with it.
For now I settled on using libopencm3 for interfacing with the core
for when I'm too lazy to write such stuff myself. In case of the USB
code, for example, I hope you can relate.
First steps:
------------
* install an ARM-none-eabi toolchain
* optional: install ARM-none-eabi GDB
* install software that allows you to put your firmware onto the
controller:
* st-link (if you have an st-link programmer)
* openocd (if you have an st-link programmer - as an alternative -
or some other more obscure tool)
* stm32flash (when you're going to flash via UART)
* initialize libopencm3 submodule:
# submodule init
# submodule update
* build libopencm3
# cd libopencm3 && make
* build projects you're interested in
# cd ws2812 && make
Flashing:
---------
The Makefile is prepared with a few targets that will trigger flashing
using the various possible ways. Look into Makefile.rules for details.
When you're going to use stm32flash (and it's easy and nice!), do it
like this:
* set BOOT0 to 1, BOOT1 to 0 (boot from internal memory - ROM bootloader)
* connect UART to UART1 pins (GND, on STM32F103: TX on PA9, RX on PA10)
* power the development board
* run stm32flash:
# stm32flash -w mybinary.bin /dev/ttyUSB0
List of projects:
-----------------
ws2812:
this implements a controller for WS2812(b) LEDs using PWM capabilities.
It presents itself to the host PC as a USB CDC (serial) device.
You can send data to that USB device to set LED colors:
<16bit MSB LED number> <8bit green> <8bit red> <8bit blue>
A tool that does this with a CLI interface is also present in a subfolder.
usb_dfu:
USB Bootloader (99% copied from libopencm3-examples)
Adapted for STM32F103 China development board:
- bootloader is triggered by setting BOOT1 to 1 (since no other button
is available)
- a Makefile target for projects exists: use the suffix .dfu-flash
to run dfu-util for flashing
Your own work?
--------------
See libopencm3-examples (https://github.com/libopencm3/libopencm3-examples/)
to see how to get things going. You'll probably need to adapt GPIO pins
(at least) for your target platform.
If you happen to have an el-cheapo STM32F103 from China, too, these
documentation links might come handy:
* stm32f103 datasheet: http://www.st.com/content/ccc/resource/technical/document/datasheet/33/d4/6f/1d/df/0b/4c/6d/CD00161566.pdf/files/CD00161566.pdf/jcr:content/translations/en.CD00161566.pdf
* stm32f1xx manual: http://www.st.com/content/ccc/resource/technical/document/reference_manual/59/b9/ba/7f/11/af/43/d5/CD00171190.pdf/files/CD00171190.pdf/jcr:content/translations/en.CD00171190.pdf
* STM32 Cortex-M3 programming manual: http://www.st.com/st-web-ui/static/active/en/resource/technical/document/programming_manual/CD00228163.pdf
* http://www.mikrocontroller.net/articles/STM32 (german, KB article)