STM32 Discovery and ECU simulator kit connect to Tuning Studio via Serial port.
https://www.youtube.com/watch?v=Tt3HtRRtWtY
openecu/stm32-firmware
https://github.com/openecu/stm32-firmware
http://www.embedds.com/custom-car-ecu-based-on-stm32/
http://crazychucks.com/news/Custom+car+ECU+based+on+STM32
OpenECU.org
http://www.openecu.org/index.php?title=Main_Page