What means the Msp in HAL_MspInit ?
This comment generated by the CubeMX at the start of main()
defines MSP.
/* STM32F4xx HAL library initialization:
- Configure the Flash prefetch, instruction and Data caches
- Configure the Systick to generate an interrupt each 1 msec
- Set NVIC Group Priority to 4
- Global MSP (MCU Support Package) initialization
*/