Commonly used data types in microcontroller application design-EEWORLD

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First, let's talk about variables. As the name implies, a variable is a variable that can be changed, similar to the unknown number (X, Y, Z) in a mathematical equation. From the perspective of computer hardware, a variable is actually a symbolic abstraction of a RAM unit. In C language, a variable must be defined with a data type before it can be used.

As we all know, C language data types are divided into basic data types, bits, pointers, and constructed data types (arrays, structures, unions). MCU applications are composed of a collection of variables defined by these data types.

In a single-chip program system, we often use a file called typedef.h to display the required data types. In specific program design, we need to define various types of variables according to different functional needs. Commonly used ones include data temporary storage class, flag class, etc. For example, it is used to display cache, data collected after analog-to-digital conversion, etc. We will define different types of variables according to different uses, different value ranges, and different scopes.

Basic data types are the types we often use. In a specific MCU program, we use basic data types to define some flags, temporary storage, and scattered quantities. For example, in an RTC system, we can define (typedef unsigned char u8), u8 hour, u8 minute, u8 second. Basic data types are the simplest, most basic, and most commonly used data types. They are also the most frequently used in operations.

Commonly used basic data types include char, int, float, double, etc. There are signed and unsigned types.

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