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U23_2013_examples

The U23 is the educational youth project organized by the Chaos Computer Club Colonge e.V.

This years topic is based on ARM Cortex-M4 microcontrollers. As a development plaform the STM32F4-Discovery boards are used because they are cheap and offer a lot of cool features

This repository contains a make-based buildsystem and a few libraries for abstracting basic system startup and libc-specific stuff as well as a few examples on how to use different on- and off-chip peripherals.

Folder contents

The following markups are supported. The dependencies listed are required if you wish to run the library.

  • bare_metal/ -- Bare metal examples without any libs except CMSIS and the STM Peripheral Lib, just here for the sake of completeness
  • build/ -- Files for the buildsystem
  • docs/ -- Documentation (Datasheets and Schematics)
  • examples/ -- Examples which use the libs in libs/ for several peripherals
  • libs/ -- Libraries which abstract the startup and libc-specifics a bit
  • tools/ -- Extra tools like stlink-trace for talking to the trace macrocell

Dependencies

Usage

If you want to build everything, just use

make

To flash a built firmware using OpenOCD, you can run

make upload FIRMWARE=06_servo

There is another make target called upload-fast which uses stlink for flashing. It is called fast because it only erases and writes the flash pages which are actually used by the new firmware.

make upload-fast FIRMWARE=06_servo

For getting debug output via the trace macrocell, you can use the trace makefile target like this

make trace

Make sure you enabled the debug output!

If you want to change the default FIRMWARE to be uploaded, you can do so in the config.mak file in the root folder.

udev-rules

To be able to talk to the JTAG debugger, you need to install a udev-rule to your system. To do this, create file /etc/udev/rules.d/50-stm32f4.rules like this

gksudo gedit /etc/udev/rules.d/50-stm32f4.rules

Paste the following rule into the file and save and close it:

ATTR{idVendor}=="0483", ATTR{idProduct}=="3748", SYMLINK+="stm32-%k", MODE="666", GROUP="plugdev"

After that you can restart your computer or execute

sudo udevadm control --reload-rules

to reload the udev rules. After replugging the board, you should be able to access it as a normal user.