以STM32F103單片機(jī)與STM32F103單片機(jī)之間進(jìn)行SPI雙機(jī)通信為例,直接使用DMA傳輸進(jìn)行數(shù)據(jù)的發(fā)送與接收,最后通過實驗證明了DMA傳輸?shù)母咝Ш蜏?zhǔn)確性。with the SPI dual-MIC communication between STM32F103 MCU and STM32F103 MCU taken as an example,data TraNSmission and reception are carried out directly by using DMA TraNSmission to prove the efficiency and accuracy of DMA TraNSmission by experiments.
標(biāo)簽： stm32 單片機(jī) spi 通信 proteus
上傳時間： 2022-03-27
上傳用戶：aben
設(shè)計了自動控制系統(tǒng)綜合實驗案例“基于LabVIEW和單片機(jī)的溫度控制系統(tǒng)設(shè)計”。實驗系統(tǒng)硬件部分由單片機(jī)、溫度傳感器、D/A轉(zhuǎn)換模塊、調(diào)壓模塊和電烤箱組成,設(shè)計了單片機(jī)與各個模塊之間的接口電路。軟件部分采用LabVIEW軟件實現(xiàn)控制算法,并設(shè)計監(jiān)控界面實現(xiàn)參數(shù)設(shè)定、溫度數(shù)據(jù)實時監(jiān)控等功能。設(shè)計了單片機(jī)與LabVIEW軟件之間的串口通信程序,實現(xiàn)了輸入、輸出數(shù)據(jù)的傳輸。通過綜合實驗系統(tǒng)設(shè)計,使學(xué)生得到控制系統(tǒng)設(shè)計和實驗調(diào)試等綜合能力的訓(xùn)練。A comprehensive experimental case of the automatic control system is presented,which is the design of the temperature control system based on LabVIEW and SCM.The hardware part of the experimental system is composed of the SCM,temperature sensor,D/A conversion module,voltage regulating module and electric oven.The interface circuit between the SCM and each module is designed.In the software part,LabVIEW software is used to realize the control algorithm,and the monitoring interface is designed to realize the functions of parameter setting,temperature data real-time monitoring,etc.The serial communication program between the SCM and LabVIEW software is designed to realize the TraNSmission of input and output data.Through the design of this comprehensive experimental system,students can get the comprehensive ability training for the control system design,experiment debugging,etc.
標(biāo)簽： labview 單片機(jī) 自動控制系統(tǒng)
上傳時間： 2022-03-27
上傳用戶：qdxqdxqdxqdx
電學(xué)中的測量技術(shù)涉及范圍非常廣,電流測量在電學(xué)計量中占有非常重要的位置。如何精確地進(jìn)行電流測量是精密測量的一大難題。傳統(tǒng)的電流檢測電路多采用運(yùn)算放大芯片與片外電流檢測電路相結(jié)合的方式,電路集成度很低,需要較多的接口和資源才能完成對電路的檢測。本文把所有電路部分都集成在一塊芯片上,包括檢測電阻,運(yùn)算放大器電路及模擬轉(zhuǎn)數(shù)字轉(zhuǎn)換電路,從而在電路內(nèi)部可以進(jìn)行電流檢測,使電路更好的集成化。前置電路使用二級共源共柵結(jié)構(gòu)的運(yùn)算放大器,減小溝道長度調(diào)制效應(yīng)造成的電流誤差。10位SAR ADC中采用電容驅(qū)動能力強(qiáng)的傳輸門保證了模數(shù)轉(zhuǎn)化器的有效精度。比較器模塊采用再生鎖存器與遲滯比較器作為基礎(chǔ)單元組合解決精密測量的問題。本設(shè)計可以作為嵌入芯片內(nèi)的一小部分而檢測芯片中的微小電流1mA~100mA,工作電壓在1.8v左右,電流檢測精度預(yù)期達(dá)到10uA的需求。The measurement technology in electricity involves a wide range,and current measurement plays a very important position in electrical measurement.How to accurately measure current is a big problem in precision measurement. The traditional current detecting circuit adopts the combination of the operational amplifier chip and theoff-chip current detecting circuit, The circuit integration is very low, and more interfaces and resources are needed tocomplete the circuit detection.This topic integrates all the circuit parts into one chip, including detection resistance, operational amplifier circuit andanalog to digital conversion circuit. Highly integrated circuit makes the external resources on the chip more intensive,so that current detection can be carried out inside the circuit, so that the circuit can be better integrated. Thefront-end circuit of this project uses two-stage cascade operational amplifier and cascade tube to reduce the currenterror caused by channel length modulation effect. In 10-bit SAR ADC, the TraNSmission gate with strong capacitivedriving ability ensures the effective accuracy of the analog-to-digital converter. Comparator module uses regenerativelatch and hysteresis comparator as basic unit to solve the difficult problem of precision measurement. This topic can beused as a small part of the embedded chip to detect the micro-current in the chip 1 mA~100 mA, the working voltageis about 1.8v, and the current detection accuracy is expected to reach the requirement of 10 uA.
標(biāo)簽： 電流檢測 電路 運(yùn)算放大器 adc
上傳時間： 2022-04-03
上傳用戶：
為了實時檢測血氧量,能使缺氧特別敏感的腦組織或心臟類疾病患者得到及時治療,采用近紅外雙波長透射式光電脈搏血氧測定法,以H橋電路對發(fā)射光源進(jìn)行控制及通用運(yùn)算放大器搭建濾波電路。運(yùn)用參數(shù)理論計算和計算機(jī)仿真結(jié)果相對比的方法,通過Mu ltisim軟件對所設(shè)計電路進(jìn)行仿真,仿真結(jié)果與理論參數(shù)計算相吻合,證明了電路參數(shù)設(shè)計的可行性,為血氧儀的實物制作提供參考。For real-time detection of oxygen saturation for timely treatment of the brain or heart,which are very sensitive to oxygen inadequacy,the near-infrared wavelengths double photoelectric pulse oximeter TraNSmission method is adopted.The illuminant is controlled with the H bridge circuit and the filter circuit is built with general op-amps.Parameters by theoretical calculation is compared with the computer simulation results in Multisim and satisfactory results are obtained.It is shown that the design of the circuit parameters is feasible and can be a help in making the physical blood-oxygen monitor.
上傳時間： 2022-05-12
上傳用戶：
說明： 基于CC2541藍(lán)牙模塊與單片機(jī)的串口通信，ble藍(lán)牙透傳 ，安卓手機(jī)app與源碼，串口調(diào)試助手(Based on CC2541 Bluetooth module and MCU serial communication, ble Bluetooth transparent TraNSmission, Android mobile app and source code, serial debugging assistant)
標(biāo)簽： cc2541 藍(lán)牙 單片機(jī) 串口通信
上傳時間： 2022-05-16
上傳用戶：
0引言對于一個程序員，如果要從頭開始完全由自己來編寫一個用于通信的應(yīng)用程序，必須對相關(guān)的網(wǎng)絡(luò)協(xié)議及其它的一些底層技術(shù)有較深入的了解，編程難度比較大。Visual Basic（VB）為廣大程序員提供了基于WindowsSockets網(wǎng)絡(luò)編程接口的Winsock控件，它封裝了所有繁瑣的技術(shù)細(xì)節(jié)，并提供了訪問TCP和UDP網(wǎng)絡(luò)服務(wù)的方便途徑，只需通過設(shè)置控件的屬性并調(diào)用其方法就可輕易連接到一臺遠(yuǎn)程計算機(jī)中，并且還可以實現(xiàn)雙向交換數(shù)據(jù)。因此，利用VB的Winsock 控件來編寫基于TCP和UDP協(xié)議的通信程序，可以降低編程難度，簡化應(yīng)用程序。1TCP和UDP協(xié)議介紹TCP和UDP是TCP/IP協(xié)議中的兩個傳輸層協(xié)議，它們使用IP路由功能把數(shù)據(jù)包發(fā)送到目的地，從而為應(yīng)用程序及應(yīng)用層協(xié)議提供網(wǎng)絡(luò)服務(wù)。TCP（TraNSmission Control Protocol，傳輸控制協(xié)議）是面向連接的協(xié)議。“面向連接”就是在正式通信前必須要與對方建立起可靠的連接，這就好象平時的打電話，必須等線路接通了、對方拿起話筒才能相互通話。一個TCP連接必須要經(jīng)過三次“對話“才能建立起來，其中的過程非常復(fù)雜。UDP（User Data Protocol，用戶數(shù)據(jù)報協(xié)議）是與TCP相對應(yīng)的協(xié)議，是面向非連接的協(xié)議。“面向非連接”就是在正式通信前不必與對方先建立連接，不考慮對方狀態(tài)就直接發(fā)送數(shù)據(jù)，這就好象平時的發(fā)手機(jī)短信，不必考慮對方狀態(tài)，只需要輸入對方手機(jī)號就行。TCP提供的是面向連接的、可靠的數(shù)據(jù)流傳輸，而UDP提供的是面向非連接的、不可靠的數(shù)據(jù)流傳輸。面向連接的協(xié)議在任何數(shù)據(jù)傳輸前就建立好了點到點的連接，面向非連接的協(xié)議在數(shù)據(jù)傳輸之前不建立連接，而是在每個中間節(jié)點對面向非連接的包和數(shù)據(jù)包進(jìn)行路由。
標(biāo)簽： tcp udp協(xié)議 通信
上傳時間： 2022-06-24
上傳用戶：
PrefaceDuring the past years, there has been a quickly rising interest in radio access technologies for providingmobile as well as nomadic and fixed services for voice, video, and data. The difference indesign, implementation, and use between telecom and datacom technologies is also becoming moreblurred. One example is cellular technologies from the telecom world being used for broadband dataand wireless LAN from the datacom world being used for voice-over IP.Today, the most widespread radio access technology for mobile communication is digital cellular,with the number of users passing 5 billion by 2010, which is more than half of the world’s population.It has emerged from early deployments of an expensive voice service for a few car-borne users,to today’s widespread use of mobile-communication devices that provide a range of mobile servicesand often include camera, MP3 player, and PDA functions. With this widespread use and increasinginterest in mobile communication, a continuing evolution ahead is foreseen.This book describes LTE, developed in 3GPP (Third Generation Partnership Project) and providingtrue 4G broadband mobile access, starting from the first version in release 8 and through the continuingevolution to release 10, the latest version of LTE. Release 10, also known as LTE-Advanced,is of particular interest as it is the major technology approved by the ITU as fulfilling the IMTAdvancedrequirements. The description in this book is based on LTE release 10 and thus provides acomplete description of the LTE-Advanced radio access from the bottom up.Chapter 1 gives the background to LTE and its evolution, looking also at the different standardsbodies and organizations involved in the process of defining 4G. It also gives a discussion of the reasonsand driving forces behind the evolution.Chapters 2–6 provide a deeper insight into some of the technologies that are part of LTE and itsevolution. Because of its generic nature, these chapters can be used as a background not only for LTEas described in this book, but also for readers who want to understand the technology behind othersystems, such as WCDMA/HSPA, WiMAX, and CDMA2000.Chapters 7–17 constitute the main part of the book. As a start, an introductory technical overviewof LTE is given, where the most important technology components are introduced based onthe generic technologies described in previous chapters. The following chapters provide a detaileddescription of the protocol structure, the downlink and uplink TraNSmission schemes, and the associatedmechanisms for scheduling, reTraNSmission and interference handling. Broadcast operation andrelaying are also described. This is followed by a discussion of the spectrum flexibility and the associated
上傳時間： 2022-07-08
上傳用戶：
此強(qiáng)而有力的工具將會增加網(wǎng)站聯(lián)機(jī)速度。它最佳化了操作系統(tǒng)的設(shè)定及連結(jié)。Amplify修改了MTU(Maximum TraNSmission Unit)、RWIN(Receive Window)，TTL(Time to Live)、PMTU's(Path Maximum TraNSmission Unit)。這些改改將的減少數(shù)據(jù)處理的分割次數(shù)，可以將資料快速的呈現(xiàn)在使用者面前。
標(biāo)簽：
上傳時間： 2013-06-29
上傳用戶：eeworm
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