http://www2.st.com/content/st_com/en/products/embedded-software/mcus-embedded-software/stm32-embedded-software/stm32-standard-peripheral-libraries/stsw-stm32054.html

文件：
http://www2.st.com/content/ccc/resource/technical/software/firmware/48/ab/e5/17/0d/79/43/74/stsw-stm32054.zip/files/stsw-stm32054.zip/_jcr_content/translations/en.stsw-stm32054.zip