http://124.222.62.86/yd-data/STM32coreboard/STM32F0devboard/STM32F051R8T6/STM32F051R8-size.pdf
http://124.222.62.86/yd-data/STM32coreboard/STM32F0devboard/STM32F051R8T6/STM32F051R8T6-sch.pdf