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There is such a paragraph in linux-2.6.24.4/arch/arm/kernel/head.S.
* swapper_pg_dir is the virtual address of the initial page table.
* We place the page tables 16K below KERNEL_RAM_VADDR. There...[Details]
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#include "def.h" #include "option.h" #include "2440addr.h" #include "mmu.h" #include "stdio.h" /*Interrupt processing function Press different buttons to enter the interrupt processing, and start...[Details]
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#include
#include macros.h
#define uchar unsigned char
#define uint unsigned int
uchar const table ={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,
0x77,0x7c,0x39,0x5e,0x79,0x71,0X00};...[Details]
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Any consumer product with a power supply, from a personal computer to a flat-screen TV, will have a small fan on the back to cool the circuitry. When it comes to controlling fans, thermistors have be...[Details]
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A new system was built, which uses line laser for real-time 3D reconstruction. It does not need to judge the position every time to start taking pictures. Two proximity switches were added. When the ...[Details]
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Recently, Hechuang Automotive Technology Co., Ltd. ("Hechuang Automobile" for short) and Guangzhou Juwan Technology Research Co., Ltd. ("Juwan Technology Research" for short) signed a strategic coope...[Details]
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According to foreign media reports, on August 19, Vincent Roche, CEO of chip maker Analog Devices (ADI), said in an interview with the media that technology is affecting the future of the automotive ...[Details]
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The integrated development of the Yangtze River Delta requires power safety and quality services to come first. On April 16, the State Grid Shanghai Electric Power Company held a launch event at th...[Details]
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Instrument circuit maintenance has always been an indispensable part in electronic companies. Because only through it can the originally unqualified products finally leave the factory. However, repai...[Details]
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1. LED lighting route analysis
The design of lighting fixtures is based on a three-way game between the LED light-emitting part, the drive control part and the optical heat dissipation str...[Details]
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The self-made charger
introduced in this article
uses LM324's four operational amplifiers as comparators, TL431 to set the voltage reference, and S8550 as the adjustment tube to step down th...[Details]
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In wireless communication systems, diversity technology is often used to improve the spectrum efficiency of the system, generally including time domain diversity, frequency domain diversity and space...[Details]
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Function of the circuit
The peak hold circuit can be used to obtain the maximum value of a continuously changing analog signal, but in many cases, it is often necessary to obtai...[Details]
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As users and enthusiasts of traditional cars, facing the rapid development of new energy vehicles , there will indeed be a period of pain. But from a macro perspective, reducing the use of pure fuel ...[Details]
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introduction
Many electronic devices require a high-precision, high-current, regulated and adjustable DC power supply. This article introduces a general-purpose low-power regulated ...[Details]