ptp clock

Speaking of the 51 MCU clock first thought about 51 o'clock how to work. Micro-controller to work must have a "power", for 51 single-chip microcomputer, this "power" is the clock source. A 12MHz crystal oscillator is used as the clock source for general applications. Generally the first method is used more often. When the internal oscillation mode is selected, th

Understanding the STM32 clock is the basis for our application timers and more, based on recent work:Here is the clock tree for STM32:1. First note is the picture of the green Circle of two, HSE and HSI respectively represents the external clock and internal clock, where HSE is a high-speed external

In the official Application note, we can see that the PCNT oversampling routine uses a 32 Khz clock source as the reference clock source. There is also an orthogonal code. Although the external signal is used as the clock of the PCNT module, we rarely use orthogonal code. In addition, we can better master this function only when we have used it. Therefore, we sti

Instructor song,Hua Qing vision embedded college lecturer. 1.1 Introduction to rtc In an embedded system, RTC is usually used to provide reliable system time, including hour, minute, second, and year, month, and day, it is also required that the system work properly when it is shut down (usually powered by a backup battery ). Its Peripheral does not require too much auxiliary electrical channels. Typically, it only requires a high-precision 32.768khz crystal and resistance capacitor, as shown in

parts of the the system Power and Thermalmanagement controllers), which makes it difficult to createplatform-independent solutions. The "problem" a common clock framework faces is the sheer numberof different struct CLK definitions scattered Oughout the Armtree. There are more than two dozen definitions in arch/armcurrently, but the proposal to a commonframework not surprisingly re Duces that number to one. Implementations canwrap the struct CLK in

Article Title: Linux clock processing mechanism (2 ). Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. 3.3 add or delete a Software Clock After learning about the data organization of the Software Clock, let's take a look at ho

code:Operation Result:Second time:3. Reference code:Address Link: https://www.cnblogs.com/syp172654682/p/7588104.htmlIt's very well written, and it's borrowed.Reference Code replication:External CSS Code: /* Global */* {margin:0; padding:0; }. clock {width:400px; height:400px; border:10px solid #333; box-shadow:0px 0px 20px 3px #444 inset; border-radius:210px; position:relative; MARGIN:5PX Auto; Z-index:10; Background-color: #

To give you illustrator software users to detailed analysis to share the design of the high light alarm clock production tutorial. Tutorial Sharing: Step 1 Create a new document and draw a positive circle Step 2 Use the gradient tool and change the first color block to gray, and the second to dark gray. Pull out vertically as shown at the end of the chart. Step 3 Select the Ellipse and execute the ob

1. Okay, here we go. A set of steps on the "clock", specifically as follows, click on the alarm button on the phone.2. Then in enter to open a new window we click on "Alarm Clock" to open the details to enter, as shown below.3. After this entry we click on the "date", and then we can start to set our alarm date, and then click the "Finish" effect details as shown below.4. Set the alarm time by sliding the n

1. In the mobile phone we find the "Application" button, and then click Enter to find the alarm clock we want. 2. Then we will see in the application of a "clock" icon, click on the clock to enter the following figure shown. 3. Then we enter the clock interface to see that there is an "alarm" but

1. How does one implement the system clock interrupt driver rt-thread when the thread time slice is exhausted or the thread is awakened and scheduled after sleep for a period of time? Who is driving this process? The answer is the clock interruption source. Let's take a look at the clock interruption routine: In bsp/stm32f20x/drivers/board. the c source file cont

This article describes how to implement a small clock program. The Figure 2 shows the execution result of the program example. in the form Load event processing routine, the radius and coordinates of the drawn clock are calculated. when the user adjusts the window size of the clock, the form automatically redraws the content of the

1 6410 Clock SystemFrom the schematic you can know the following:1. Using 12M crystal Oscillator2 has three dividers APLL MPLL EPLL3. Generated four clocks aclk hclk PCLK SCLKHere are the range of applications for several clocks:Which aclk for the system clock, HCLK and PCLK for various peripherals and internal clocks, SCLK for the time being not considered2: initialization ProcessAs can be seen, the SYSCLK

Introduction to Vector clock algorithms. Vector clock algorithm overview 1. Background: first, let's talk about scenarios where Vector clock is needed. When writing data, we often hope that the data will not be stored at a single point. Introduction to Vector clock algorithms for db1 and db2 I. Background Let's talk a

Author:Liu Hongtao, senior lecturer of Huaqing vision embedded College, and an arm ATC authorized training instructor. Recently, I plan to develop a PXA270 system for our far-sighted teaching in Huaqing. I will record some of my software and hardware development processes and share and discuss them with you. Have good suggestions everyone must communicate in time, lht@farsight.com.cn. In the previous article, I wrote "PXA270 embedded system design 1: Power Supply Management". Today, I want to wr

Many hardware functions require bus clock support, such as LCD and I2C. This article analyzes the bus clock of S3C2440 and the operations related to the clock frequency of S3C2440 bus in Linux. First, analyze the bus clock of the hardware S3C2440. 1. S3C2440 fclk hclk pclk: The clo