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Some time ago, mmap was used to implement a file copy operation. Now, Linux I/O is used to implement file copy. The basic idea is to copy the file to a common buf, and then copy the data in buf to the...[Details]
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The FLASH memory module of the MSP430 FLASH microcontroller is divided into several segments according to different capacities, among which the information memory SegmengA and SegmentB each have 128 ...[Details]
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First, here is a general block diagram of the page table structure of the arm mmu (the following discussion is gradually expanded from this diagram): The above is the typical structure of the arm's...[Details]
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1 Introduction Ultrasonic waves have strong directivity, slow energy consumption, and can propagate over long distances in the medium, so they are used for distance measurement. Ultrasonic detectio...[Details]
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本文章研究了基于Zeta／Sepic双向变换器的光伏半导体发光二极管照明系统，提出了一种充电控制算法，其既能实现太阳能电池的最大功率点跟踪(MPPT)又能满足蓄电池电压限制条件和浮充特性；设计一种基于HV9930控制芯片的LED恒流驱动电路。构建实验系统，测试表明，控制器可以根据蓄电池状态准确地在MPPT、恒压、浮充算法之间切换，MPPT充电效率较恒压充电显著提升，LED驱动电路恒流效果好。
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The SOF (Start Of Frame) package in USB is a very simple concept that is frequently encountered in USB development: SOF is sent regularly by the USB host (FS) every 1ms. It has many functions and is ...[Details]
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High voltage insulation resistance tester is suitable for measuring the insulation resistance of various transformers, motors, cables, switches, electrical equipment and insulating materials.
Hig...[Details]
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We often see traffic police using breathalyzers to check whether drivers are under the influence of alcohol when checking for drunk driving. In fact, the alcohol tester is actually very easy to make....[Details]
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As the use of solar energy becomes more and more widespread, the requirements for the use of reserve power in photovoltaic off-grid systems are becoming higher and higher. At present, the use of c...[Details]
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Recently, nearly 60 young entrepreneurs from the Shanghai Federation of Industry and Commerce Youth Entrepreneurs Association Dual Carbon Development Committee, Pudong New Area Federation of Industry ...[Details]
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Function: Relocate the printf function to use it as the serial port print output function. Replace the usart_send_string() function step: usart.c contains the USART initialization function 1. US...[Details]
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High-brightness light-emitting diodes (LEDs) have the characteristics of low power consumption, long life, fast response speed, small size, no pollution, and easy integration. They are a new genera...[Details]
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Apple quietly released a new version of its 30W USB-C Power Adapter today, model number MY1W2. The external design of this adapter has not changed, so if there are any changes, it is likely to be int...[Details]
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With the advancement of industrial control technology and the intensification of market competition, developers usually need to design a measurement and control system that meets user requirements ...[Details]
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ARM system clock initialization:
This requires knowing what is a clock pulse signal, what is a clock frequency, and what is a clock source.
Clock pulse signal:
Clock pulse ...[Details]
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