What does the MSP in STM32CubeMX HAL_xxx_MspInit() functions stand for?

Question

I was wondering what the abbreviation "MSP" in HAL_xxx_MspInit() callbacks stands for. I have seen that in some firmware drivers like the HAL library from ST. For example:

void HAL_UART_MspInit(UART_HandleTypeDef *huart);
void HAL_SPI_MspInit(SPI_HandleTypeDef *hspi);

from stm32f3xx_hal_uart.h and stm32f3xx_hal_spi.h. I am wondering what Msp refers to. Is it just a naming convention for callbacks from init functions in drivers or does it have a deeper meaning (what I suspect it has).

Answer 1

In STM32CubeMX it stands for MCU Support Package.

The STM32CubeMX documentation "STM32CubeMX for STM32 configuration and initialization C code generation" (UM1718) is clear on this - section 5.1:

It does however somewhat unhelpfully use the term several times in the documentation before it actually defines it!

Other aspects of the STM32CubeMX naming conventions are also defined in this document.