FSM-55 LED Matrix Display Board is a simple board to play 5x5 LED Display. Please see the product page: http://www.seeedstudio.com/depot/FSM55-LED-Matrix-Display-p-2121.html There are three demonstrations and default is Hacker Emblem and "Happy Hacking!". Please edit CSRC variable in the Makefile to select other applications. The file stlink-v2.cfg can be used for ST-Link/V2 with OpenOCD. You can flash by typing: $ openocd -f ./stlink-v2.cfg -c "program build/hacker-emblem.elf; reset run; shutdown" Thanks to Kiwamu Okabe who kindly tested OpenOCD and wrote the configuration.