What means the Msp in HAL_MspInit ?
MSP = MCU Specific Package
Source: Acronyms and definitions of "UM1725 User Manual Description of STM32F4xx HAL drivers" (http://www.st.com/content/ccc/resource/technical/document/user_manual/2f/71/ba/b8/75/54/47/cf/DM00105879.pdf/files/DM00105879.pdf/jcr:content/translations/en.DM00105879.pdf)