Figure 2: The Role of MMU MCUs have an address set known as the virtual address range. For example, the virtual address range for Cortex-M 32-bit is 0 ~ 0xFFFFFFFF (4G address space). When this controller addresses a 256M memory, its usable address range is limited to 0 ~ 0x0FFFFFFF (256M). 1. In processors without … Read more
Abstract The CAN-FD bus protocol has a high effective data rate and is widely used in automotive internal buses. This paper introduces the design of a CAN-FD protocol controller driver based on the Cortex-M0 processor, detailing the development process of the CAN-FD driver. It achieves multi-node communication by communicating with other CAN-FD nodes and captures … Read more
In the era of the Internet of Everything, IoT technology is changing our lives and work methods at an unprecedented speed. From smart homes to industrial automation, from smart transportation to remote healthcare, the presence of IoT is everywhere. Behind this, the MQTT protocol plays a key role as an important cornerstone of IoT communication. … Read more
After introducing memory virtualization technology, there are three types of addresses in the memory system. Machine Address (MA): The real hardware machine address, visible on the address bus as address signals. Guest Physical Address (GPA): The pseudo-physical address seen by the virtual machine after abstraction by the VMM. Virtual Address (VA): The linear address space … Read more
In today’s booming era of the Internet of Things (IoT), microcontrollers play a crucial role as core control units. Bluetooth technology, with its convenient wireless communication characteristics, has expanded the application space for microcontrollers. The STM32 series microcontrollers are favored by developers for their high performance and low power consumption. 1. Overview of Bluetooth (1) … Read more
Source | Chip Xiao Er’s Afternoon Tea Knowledge Circle | Entering the Camera Lens/Module/CMOS Chip Group, Add WeChat yijijuechen2023 As a widely used communication bus between automotive ECUs, CAN has some fundamental questions related to its application, such as Since it is a bus, why aren’t all connected together, and why are so many CAN … Read more
RS232 and RS485 are common interfaces in low voltage applications. Many friends have mentioned the differences between them, so today let’s learn about them together. 1. Physical Structure of the Interfaces 1. RS232 Interface: One of the computer communication interfaces, RS-232 interfaces typically appear in the form of 9 pins (DB-9) or 25 pins (DB-25). … Read more
Introduction: This article aims to discuss knowledge about TCP. Please forgive any inappropriate metaphors. In the fourth year of the Tianqi era of the Ming Dynasty, early morning. As dawn broke, I drove a horse-drawn cart full of goods to the South City Gate, which was the central location for handling goods. A line of … Read more
This article is a prequel to “The Ming Dynasty Postman of TCP/IP”, discussing how the ministers of the Ming Dynasty’s cabinet designed the TCP/IP network. During the Tianqi period of the Ming Dynasty, Emperor Zhu Youjiao was obsessed with carpentry and heavily relied on the eunuch Wei Zhongxian, having not attended court for a long … Read more
Canopen is an open and widely used fieldbus. This article mainly introduces the various products from Schneider that support Canopen communication. Canopen Master Stations: Twido, M238, M258, M241, M251, LMC058/LMC078, M340, Premium (The number of supported slave devices varies for each master station; please refer to the manual for details.) Canopen Slave Stations: ATV312/61/71 IMC … Read more