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
From: http://blog.chinaunix.net/uid-22917448-id-1765503.html
Audio ClockingAudio clock====================
This text describes the audio clocking terms in ASoC and digital audio inGeneral. Note: Audio clocking can be complex!This document describes the ASoC and audio clock terms in digital audio.
Master ClockMaster Clock------------
Every audio subsystem is driv
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
DSP/BIOS getting a glimpse of the door path-ticking clock and burning FlashOperating platform and environment DSP model: TMS320C6713Simulator: XDS510PLUSFlash model: Both AM29LV800BT and AM29LV800BT have been tried (the general interface is the same, but the difference is not big)RAM model: MT48LC16M16A2P (pay attention to the 16-Bit Data Line Interface)DSP/BIOS Library: V5.31.02CSL Library: (assuming the reader is already using) write the LED program
Tags: 28335 clock
Listen 335 clock
On the 335, there is an on-chip clock Module Based on the PLL circuit. 1 shows that there are two ways to provide clock for the CPU and peripherals:
One is to use an external clock source, connect it to the X1 pin or the xclkin pin, X
IntroducedMany programs in a computer rely on precise time to work properly, such as how a script executes at a specified time.The computer has two clocks, one is always running, a battery (CMOS)-powered hardware clock, and the other is a system clock (also known as a software clock) maintained by the operating system running on your computer. At startup, the ker
In the Linux operating system, many activities are related to time, such as process scheduling and network processing, and so on. Therefore, understanding the clock processing mechanism in the Linux operating system helps to better understand how the Linux operating system works. This paper analyzes the clock processing mechanism of Linux 2.6.25 kernel, first introduces some hardware timers in computer syst
Clock in the game development, sometimes we need a clock to record the game time, if the end of time to end the game. This article describes how to use timer and timertask to implement such a clock in J2ME and give specific code examples.
There is a TimerTask class in the Java.util package that you can extend this class and implement his run () method to write ou
Introduction
List several registers to use first: LOCKCON0 LOCKCON1 oscset mpllcon epllcon epllcon_k
These 6 registers control 2 internal PLL phase-locked loops, an external crystal oscillator. The output values of these two independent PLL phase-locked loops are determined by the setting values of Mpllcon and Epllcon , respectively. The stable output time of the PLL is determined by LOCKCON0 and LOCKCON1 . The stability time of the crystal oscillator is determined by Oscset .
Normally, the PL
STM32 A total of five clock sources, namely:
HSI is a high-speed internal clock, rc oscillator, the frequency of 8MHz;
HSE is a high-speed external clock with a frequency range of 4~6mhz; (can connect quartz/ceramic resonator or external clock source)
LSI is low speed internal
Transferred from: http://blog.csdn.net/droidphone/article/details/7975694Clock source is used to provide a time baseline for the Linux kernel, and if you get the current time with the Linux Date command, the kernel reads the current clock source, transforms and returns the appropriate time units to the user space. At the hardware level, it is usually implemented as a counter driven by a fixed clock frequenc
This paper interprets the SHARC clock systemclkin: Clock input. pre-divider: Front dividerPost-divider: Rear dividerCCLK: Kernel clockPCLK: Peripheral ClockRegister Overview Power Management Control Register (pmctl). Governs the operationof the PLL and configures the PLL settings.Power Management Control Register 1 (PMCTL1). This register controls the various peripheral ' s clocks.Clock Control: Programmabl
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