Avoid pitfalls of wild pointers and memory leaks, and understand the core foundation of embedded development from a kernel perspective. In embedded system development, the C language has always held an unshakable position. Pointers and memory management, as the most powerful yet dangerous features of C, often serve as a crucial benchmark distinguishing novice engineers … Read more
π C Language Loop Structures (Part 2): Detailed Explanation of while and do-while Loops Author: IoT Smart Academy π‘ 1. Why do we need while? Sometimes we do not know how many times a loop should execute, for example: The user keeps entering data until they input 0 to end Repeatedly entering a password until … Read more
Introduction“Do you understand the interrupt mechanism of Cortex-M?”“How do you implement a memory pool in C?”“How is volatile used in embedded systems?” If you are asked these questions in an interview and cannot answer, you may be eliminated immediately!Embedded development is different from regular software development; interviewers focus heavily on low-level skills.. Today, we reveal … Read more
(Note: This article only provides a process description of certain consumer features visible to some users, and does not serve as promotional guidance.) (Disclaimer: The content of this article is time-sensitive; please refer to the latest official guidelines for specific operations.) Feeling Lost on Your First Day Learning C? Here Are My 15,000-Word Study Notes … Read more
β Comprehensive Analysis of Control Flow in C Language: The if Statement π 1. Single Branch if π Executes if the condition is true, otherwise skips. #include <stdio.h> int main() { int age; printf("Please enter your age:"); scanf("%d", &age); if (age >= 18) { printf("Adult, can act independently!\n"); } return 0; } π 2. if…else … Read more
Problem For a byte of data, swap its high and low bits one by one. For example, 11010001, after swapping the corresponding bits 0-7, 1-6, 2-5, 3-4, it becomes 10001011. γPaidγ STM32 Embedded Resource Package Solution Approach For this problem, the first thought is to process the original byte bit by bit using shift operations, … Read more
The Lost Art of Structure Packing Eric S. Raymond <[email protected]> The Lost Art of Structure Packing Table of Contents Who Should Read This Article The Reason I Wrote This Article Alignment Requirements Padding Struct Alignment and Padding Bit Fields Struct Member Reordering Tricky Scalar Cases Readability and Cache Locality Other Packing Techniques Overriding Alignment Rules … Read more
Before we learn about the basic building blocks of the C language, let’s take a look at a minimal C program structure, which can serve as a reference in the upcoming chapters. C Hello World ExampleC programs mainly consist of the following parts: preprocessor directives, functions, variables, statements & expressions, and comments. Let’s look at … Read more
In the article “Running Shell Scripts in Linux C Code to Get Their Return Values,” the concept of “anonymous pipes” was mentioned, which allows communication between parent and child processes through the use of fork. However, this is limited to communication between a parent and its child or between two child processes with the same … Read more
When programming in C under Linux to execute Shell commands or scripts, the system function is generally used. However, it only returns whether the execution was successful or failed, without returning the corresponding return value of the executed Shell command or script. The following method can be used to achieve this requirement:Temporary FileSince the return … Read more