1. Basic Knowledge of JTAG JTAG stands for Joint Test Action Group and is the IEEE 1149.1 standard. The advantage of using JTAG is that it allows integrated circuits to be tested on a PCB through boundary scan. In the ARM7TDMI processor, JTAG can directly control ARM’s internal bus, I/O ports, and other information for … Read more
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I2C Communication Protocol Basics 3.1 Introduction to Communication I²C (Inter-Integrated Circuit) is a serial communication bus designed by Philips in the early 1980s. It facilitates communication between motherboards, embedded systems, or mobile phones and peripheral devices. Due to its simplicity, it is widely used for communication between microcontrollers and sensor arrays, displays, IoT devices, EEPROMs, … Read more
Understanding the characteristics, structure, and application fields of the 51 microcontroller. Introduction: The 51 microcontroller is a microcomputer widely used in electronic systems, integrating multiple functional components such as CPU, RAM, ROM, timers, interrupt systems, and communication interfaces, capable of information collection, processing, and control of hardware devices. This article will introduce the development history, … Read more
Embedded application software will at times access the lowest level firmware and perform some hardware control. The design and implementation of drivers are crucial to ensure that a system meets its real-time requirements. The following 5 tips are considerations that every developer should keep in mind when designing drivers. Let’s follow the editor of “Microcontrollers … Read more
01 Introduction First, let’s take a look at a software architecture diagram: 1.1 Introduction to ARMv8-M TrustZone The concept of TrustZone technology is not new. This technology has been used in Arm Cortex-A series processors for many years and has now expanded to cover Armv8-M processors. At a high level, the concept of TrustZone technology … Read more
In today’s embedded systems development field, the application of Real-Time Operating Systems (RTOS) is becoming increasingly widespread, providing solid support for various complex task scheduling, resource management, and system reliability requirements. As an open-source real-time operating system, FreeRTOS stands out in numerous embedded projects across various industries due to its simplicity, efficiency, ease of portability, … Read more
Layered Thinking Layered thinking is not a mysterious concept; in fact, many engineers working on projects are already using it. I’ve seen many posts that do not mention this concept, yet a layered structure is indeed very useful, and once understood, it can lead to a moment of clarity. If I don’t understand how to … Read more
Embedded systems refer to computer systems that are embedded in devices, typically having dedicated functions and real-time requirements. Learning embedded development requires mastering both hardware and software knowledge. Here are the main topics for learning embedded systems: 1. Fundamental Knowledge Digital and Analog Circuits: Understand basic circuit principles such as logic gates, resistors, capacitors, amplifiers, … Read more
Recently, someone asked: What is the relationship between ARM9 and STM32? If we rewind 10 years, ARM9 and S3C2410 were quite popular, but the “new era” ARM processors like STM32 have also emerged. ARM9 is an early ARM processor, while STM32 is a more modern processor that has gained popularity in recent years. ARM Naming … Read more