INT16U, INT32U, and INT32S seem to be data types defined by the programmer. A literal analysis of the identifier may be: INT16U - 16-bit unsigned integer data; INT32U - 32-bit unsigned integer data. Type data; INT32S - 32-bit signed integer data. With such a custom identifier, if you want to define a 16-bit unsigned number in future code, you may write: INT16U n; In this way, n is declared as a 16-bit unsigned variable... The rest is similar.

Single-chip microcomputer, the full name of single-chip microcomputer (English: Single-Chip Microcomputer), also known as microcontroller (Microcontroller), is a combination of central processing unit, memory, timer/counter (Timer/Counter), various A microcomputer with input and output interfaces integrated on an integrated circuit chip. Compared with general-purpose microprocessors used in personal computers, it emphasizes self-supply (without external hardware) and cost savings.

Its biggest advantage is that it is small in size and can be placed inside the instrument, but it has small storage capacity, simple input and output interfaces, and low functions. Due to its very rapid development, the definition of the old single-chip microcomputer can no longer be satisfied. Therefore, it is called a wider range of microcontrollers in many applications; from the 1980s, it developed from 4-bit and 8-bit microcontrollers to the current 32-bit 300M high-speed microcontrollers.