STM32示例代码中变量名开头的“uw”代表什么含义？

Great question! Those uw prefixes you're spotting follow STMicroelectronics' internal variable naming convention—a modified take on Hungarian notation tailored to their microcontroller architectures.

Breaking down the two letters:

• u: Stands for unsigned—this tells you the variable holds an unsigned integer value, no negative numbers allowed.
• w: Stands for word—in STM32 terminology, a "word" refers to a 32-bit data type. This aligns perfectly with the uint32_t type used in your examples (like static __IO uint32_t uwLsiFreq = 0;), since uint32_t is a 32-bit unsigned integer.

Putting it all together, a name like uwLsiFreq translates to "unsigned 32-bit word representing LSI frequency"—it's a quick way to grasp both the variable's data type and purpose just by looking at its name.

You might run into other similar prefixes in STM32 code too, such as:

• ui for unsigned 16-bit integers (matching uint16_t)
• uc for unsigned 8-bit integers (matching uint8_t)
• sw for signed 32-bit integers (matching int32_t)

示例来源：STM32Cube_FW_F2_V1.7.0/Projects/STM32F207ZG-Nucleo/Examples/IWDG/IWDG_Example/Src/main.c

内容的提问来源于stack exchange，提问作者Gabriel Staples