mux | 易学教程

详解51单片机基本硬件结构

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 硬件结构单片机的内部结构是由CPU、ROM、RAM等组成，现在介绍外部引脚。如图1-3所示为单片机的引脚图，这就是实验中要用的89C51单片机的外部引脚图。如表1-3所示为89C51单片机引脚分配表。图1-3　89C51单片机的引脚图表1-3　89C51单片机引脚分配表端口结构分析从1.3.1节的硬件结构中可以看出，89C51单片机总共有4组端口，P0、P1、P2和P3，了解这4组端口的结构原理对于日后的编程会有很大的帮助，由于这4组端口结构不尽相同，下面分别介绍单片机总的4组端口。由于每组端口都是由8位组成，故在下面的讲解中，只以每组端口的其中一位来解释。 1. P0口的结构及工作原理 P0口字节地址为80H，位地址80H～87H。P0端口8位中的一位结构图如图1-4所示。图1-4　P0端口位结构图由图1-4可见，P0端口由锁存器、输入缓冲器、多路开关、一个非门、一个与门及场效应管驱动电路构成。图1-4中标号为P0.X引脚的图标，表示引脚可以是P0.0～P0.7的任何一位，即在P0口有8个与图1-4所示相同的电路组成。下面先介绍组成P0口的每个单元部分。 (1)输入缓冲器在P0口中，有两个三态的缓冲器，学过数字电路的读者都知道三态门有3个状态，即在其输出端可以是高电平、低电平

Gorilla mux, best way to 'catch' response codes

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问题 I'm using Gorilla mux for all my routing. Now my app is working fine, I want to find a way to log all my response codes to -for example- statds. I have found this package: https://godoc.org/github.com/gorilla/handlers#LoggingHandler Which allows me to output all responses into apache format. Although this is nice, it's not 100% what I want. I just want to extract the response statusses and send them to statds. Now what's the best/easiest way to achieve this? package main import ( "log" "net

28335GPIO及外部中断配置介绍

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本文转载连接： https://blog.csdn.net/E_ROAD_BY_U/article/details/53083151 弄了两周终于把28335的启动流程、寄存器及中断向量表的映射方法、内存的划分等有了一个全面的了解，今天看到久违的LED灯的闪烁，顿扫阴霾。特在此总结下28335GPIO及外部中断配置介绍。其实对于一个微控制器，只要能够独立实现这两个功能，也算是入门了。一、GPIO口介绍外界二进制信息（数字量）要被CPU处理，要给存储器存放，就需要外界信息源与两者之间的交换接口，这样的交换接口若用来进行通用目的数字量的输入输出，就被称为通用数字量输入/输出接口，简称GPIO。F28335 DSP有多达88个GPIO口，对应着芯片引出的88个引脚，随着芯片的封装与尺寸的确定，引脚数目是有限的，所以这88个引脚多数都是功能复用的，即可以灵活配置为输入引脚，也可以灵活配置为输出引脚，即可以作为通用I/O引脚，也可以作为特殊功能口（如SCI、SPI、ECAN等），非常灵活，用户根据需要，可以通过GPIO MUX（输入输出多路选择器，复用开关）寄存器来进行相关配置。 F28335DSP将这88个GPIO口分成了A、B、C三大组，A组包括GPIO0至GPIO31,B组包括GPIO32至GPIO63,C组包括GPIO64至GPIO87,每个引脚都复用了多个功能，同一时刻

ffmpeg for screen capture?

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问题 So I have an Applet that captures the screen, and sound from the computer's microphone, the screenshots are then encoded to ScreenVideo2, and the sound is encoded to AAC. How can I use ffmpeg to mux this, frame by frame, and then send the muxed output to a wowza media server? if it cant be done with ffmpeg, can you kindly provide any suggestions? 回答1: which OS? Under Linux, you might want to consider http://kde-apps.org/content/show.php/FDesktopRecorder?content=147844 The central core of the

Go using mux Router - How to pass my DB to my handlers

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问题 At the moment, I try to create a small Web-Project using Go for data handling on the server. I try to pass my database-connection to my HandlerFunc(tions) but it does not work as expected. I am pretty new to golang, so maybe I did not understand some basic principles of this lang. My main func looks like this: func main() { db, err := config.NewDB("username:password@/databasename?charset=utf8&parseTime=True") if err != nil { log.Panic(err) } env := &config.Env{DB: db} router := NewRouter(env)

Publishing to google pub sub asynchronously through goroutine

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问题 I'm trying to push the message to google pub-sub asynchronously through goroutine but I'm facing below error panic: not an App Engine context I'm using mux and have an api handler n = 1 million func apihandler(w http.ResponseWriter, r *http.Request) { go createuniquecodes(n) return "request running in background" } func createuniquecodes(n) { c := make(chan string) go createuniquecodes(c, n) for val := range c { publishtopubsub(val) } } func createuniquecodes(n) { for i := 0; i < n; i++ {

Chisel3. Functional Module Mux4

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问题 I'm learning Chisel following the documentation on Github Thus far, everything worked flawlessly. But i'm stuck at chapter 13, "Functional Module Creation" I can't get the code to work . I created all my .scala classes in a copy of the chisel-template-project. Here is what i wrote / copied to create a Mux4 with variable bit width : /chisel-template/src/main/scala/ Mux4.scala import Chisel._ class Mux4(w: Int) extends Module { val io = IO(new Bundle { val sel = UInt(INPUT, 2) val in0 = UInt

GAE Golang Gorilla mux - 404 page not found

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问题 I've got some problems to use gorilla mux within GAE. When I try it, I've '404 page not found'. The rootHandler function is not called ( no traces generated) Below is part of my code, any ideas? thk in advance ... func init() { r := mux.NewRouter() r.HandleFunc("/",rootHandler) } func rootHandler(w http.ResponseWriter, r *http.Request) { var functionName = "rootHandler" c := appengine.NewContext(r) c.Infof(functionName+"-start") defer c.Infof(functionName+"-end") ... 回答1: You have to route

PTS and DTS calculation for video and audio frames

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问题 I am receiving video H264 encoded data and audio G.711 PCM encoded data from two different threads to mux / write into mov multimedia container. The writer function signatures are like: bool WriteAudio(const unsigned char *pEncodedData, size_t iLength); bool WriteVideo(const unsigned char *pEncodedData, size_t iLength, bool const bIFrame); And the function for adding audio and video streams looks like: AVStream* AudioVideoRecorder::AddMediaStream(enum AVCodecID codecID) { Log("Adding stream:

mux raw h 264 to an mp4 file, some odd errors

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What I'm doing is on an IOS app with Xcode 7.3. I got h264 data from an ip camera using UDP,the data can be decoded and displayed rightly (decoded by ffmpeg). Now I want to mux the raw H264 data to an mp4 file(some users may want to record what they are watching on his cell-phone), using ffmpeg. Nothing wrong happened when the code is running, and the result file can be played normally with QuickTime on my computer. But when played on iphone with iphone's default video player, it can't be played normally.Here is my code. Wish someone could tell me what should I do, thanks! init AVFormatContext

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