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Embedded-System-<b>Design</b>-Issues

  • 基于ROM單片機(jī)的漢字輸入法的實(shí)現(xiàn)

    在需要實(shí)時(shí)大量輸入漢字的顯示控制處理應(yīng)用中,利用傳統(tǒng)單片機(jī)實(shí)現(xiàn)顯示控制的設(shè)計(jì)方法是較難實(shí)現(xiàn)的。帶漢字字庫(kù)的液晶模塊的使用使得小容量ROM單片機(jī)的大量漢字信息輸入與顯示成為可能。提出了針對(duì)漢字字庫(kù)編碼的二級(jí)索引拼音輸入檢索方法,介紹了以ST7920作為控制器的帶漢字字庫(kù)的液晶顯示模塊的接口方法及漢字顯示和控制原理,給出了通用計(jì)算機(jī)鍵盤(pán)在單片機(jī)中的串行接口,采用該技術(shù)可大大增強(qiáng)單片機(jī)的漢字輸入功能。為小容量ROM單片機(jī)的大批量漢字信息處理提供了一種漢字輸入解決方案。 Abstract:  It is difficult to realize Chinese characters input method based on the embedded system by using the traditional design method of display control. It is possible to input and display Chinese characters based on the embedded system with the ROM of small content by using the LCD module with Chinese characters.Chinese characters input method of the quadric index recall in allusion to Chinese characters code is brought forward.The interface and the principle of Chinese characters display control based on the LCD module controlled with the ST7920 is introduced too.The serial interface of the computer keyboard in common use and the embedded system is given at the same time. It can enhance the embedded system function of Chinese characters input by using this technology, and provide a kind of Chinese characters input scheme for the embedded system with small capacity ROM.

    標(biāo)簽: ROM 單片機(jī) 漢字輸入法

    上傳時(shí)間: 2013-11-19

    上傳用戶(hù):jhksyghr

  • 基于以太網(wǎng)的虛擬示波器設(shè)計(jì)

    為提升虛擬儀器傳輸速率與實(shí)時(shí)性能,擴(kuò)展監(jiān)測(cè)范圍,在VC的軟件平臺(tái)上設(shè)計(jì)了一種全功能虛擬示波器。與傳統(tǒng)虛擬示波器相比,該系統(tǒng)采用嵌入式系統(tǒng)完成信號(hào)采集,采用工業(yè)以太網(wǎng)為傳輸介質(zhì),通過(guò)線性插值算法和多線程編程思想,實(shí)現(xiàn)波形顯示、參數(shù)計(jì)算、頻譜分析以及波形存儲(chǔ)及回放功能。實(shí)驗(yàn)結(jié)果表明,該虛擬示波器可以實(shí)現(xiàn)20 kHz采樣頻率下的波形精確顯示,達(dá)到預(yù)期的各項(xiàng)指標(biāo)。 Abstract:  o enhance the transfer rate and real-time of virtual instrument performance, expand scope of monitoring, this paper uses the VCs software platform to design a fully functional virtual oscilloscope. Compared with traditional virtual oscilloscope, this system adopts the embedded system to complete the data acquisition, industrial Ethernet as the transmission medium used by the linear interpolation algorithm and multi-threaded programming ideas, namely to achieve waveform display, parameter calculation, spectrum analysis and waveform storage and playback. Experimental results show that the virtual oscilloscope can accurately display the waveform with 20kHz sampling frequency, and achieve the desired targets.

    標(biāo)簽: 以太網(wǎng) 虛擬 波器設(shè)計(jì)

    上傳時(shí)間: 2013-11-25

    上傳用戶(hù):wbwyl

  • lpc2292/lpc2294 pdf datasheet

    The LPC2292/2294 microcontrollers are based on a 16/32-bit ARM7TDMI-S CPU with real-time emulation and embedded trace support, together with 256 kB of embedded high-speed flash memory. A 128-bit wide memory interface and a unique accelerator architecture enable 32-bit code execution at the maximum clock rate. For critical code size applications, the alternative 16-bit Thumb mode reduces code by more than 30 pct with minimal performance penalty. With their 144-pin package, low power consumption, various 32-bit timers, 8-channel 10-bit ADC, 2/4 (LPC2294) advanced CAN channels, PWM channels and up to nine external interrupt pins these microcontrollers are particularly suitable for automotive and industrial control applications as well as medical systems and fault-tolerant maintenance buses. The number of available fast GPIOs ranges from 76 (with external memory) through 112 (single-chip). With a wide range of additional serial communications interfaces, they are also suited for communication gateways and protocol converters as well as many other general-purpose applications. Remark: Throughout the data sheet, the term LPC2292/2294 will apply to devices with and without the /00 or /01 suffix. The suffixes /00 and /01 will be used to differentiate from other devices only when necessary.

    標(biāo)簽: lpc datasheet 2292 2294

    上傳時(shí)間: 2014-12-30

    上傳用戶(hù):aysyzxzm

  • Embedded systems for specific applications, usually in the centre, and as the core processor for the

    Embedded systems for specific applications, usually in the centre, and as the core processor for the practical application of soft Hardware systems, the hardware is the basis of the embedded operating system and platform, the software provides the necessary operational Physical platform and communication interface, and general embedded system software, including operating systems and application software, which Control is the core of the whole system, providing information such as HCI.

    標(biāo)簽: the applications for processor

    上傳時(shí)間: 2013-12-29

    上傳用戶(hù):稀世之寶039

  • Programming Embedded Systems in C and C++ is necessary for everyone who want to learn about embedde

    Programming Embedded Systems in C and C++ is necessary for everyone who want to learn about embedded system

    標(biāo)簽: Programming necessary Embedded everyone

    上傳時(shí)間: 2017-07-16

    上傳用戶(hù):大融融rr

  • The main function of the traffic detection system is to examine the speed, the flow, the vehicle typ

    The main function of the traffic detection system is to examine the speed, the flow, the vehicle type and the lane occupancy of the motor vehicles. The method based on ARM embedded system in this paper provides a new means for the traffic detection system research.

    標(biāo)簽: the detection function examine

    上傳時(shí)間: 2013-12-18

    上傳用戶(hù):busterman

  • samba服務(wù)器實(shí)驗(yàn)指導(dǎo)

    第一節(jié)、samba是干什么的?它有什么用? Samba(SMB是其縮寫(xiě)) 是一個(gè)網(wǎng)絡(luò)服務(wù)器,它是Linux作為本地服務(wù)器最重要的一個(gè)服務(wù),用于Linux和Windows共享文件之用;Samba可以用于Windows和 Linux之間的共享文件,也一樣用于Linux和Linux之間的共享文件;不過(guò)對(duì)于Linux和Linux之間共享文件有更好的網(wǎng)絡(luò)文件系統(tǒng) NFS,NFS也是需要架設(shè)服務(wù)器的; 2、安裝及服務(wù)操作命令 安裝samba程序非常簡(jiǎn)單,使用rpm -q samba查看當(dāng)前系統(tǒng)是否已經(jīng)安裝了samba軟件。 如果沒(méi)有那就進(jìn)入光盤(pán),rpm -ivh *samba*.rpm即可。 仔細(xì)說(shuō)下安裝的包: samba-common-3.0.28-0.el5.8    //samba服務(wù)器和客戶(hù)端中的最基本文件 samba-3.0.28-0.el5.8           //samba服務(wù)器核心軟件包 system-config-samba-1.2.39-1.el5     //samba圖形配置界面 samba-client-3.0.28-0.el5.8          //samba客戶(hù)端軟件   啟動(dòng)、暫停和停止服務(wù): /etc/init.d/smb start /etc/init.d/smb stop /etc/init.d/smb restart 或 service smb start service smb stop service smb restart   第二節(jié)、由最簡(jiǎn)單的一個(gè)例子說(shuō)起,匿名用戶(hù)可讀可寫(xiě)的實(shí)現(xiàn) 第一步: 更改smb.conf 我們來(lái)實(shí)現(xiàn)一個(gè)最簡(jiǎn)單的功能,讓所有用戶(hù)可以讀寫(xiě)一個(gè)Samba 服務(wù)器共享的一個(gè)文件夾;我們要改動(dòng)一下smb.conf ;首先您要備份一下smb.conf文件; [root@localhost ~]# cd /etc/samba [root@localhost samba]# cp smb.conf smb.conf.bak [root@localhost samba]# vi smb.conf 或geidt smb.conf & 然后我們把下面這段寫(xiě)入smb.conf中:   [global] workgroup = WORKGROUP netbios name = Liukai server string = Liukai's Samba Server security = share [test]         path = /opt/test         writeable = yes         browseable = yes         guest ok = yes 注解: [global]這段是全局配置,是必段寫(xiě)的。其中有如下的幾行; workgroup 就是Windows中顯示的工作組;在這里我設(shè)置的是WORKGROUP (用大寫(xiě)); netbios name 就是在Windows中顯示出來(lái)的計(jì)算機(jī)名; server string 就是Samba服務(wù)器說(shuō)明,可以自己來(lái)定義;這個(gè)不是什么重要的; security 這是驗(yàn)證和登錄方式,這里我們用了share ;驗(yàn)證方式有好多種,這是其中一種;另外一種常用的是user的驗(yàn)證方式;如果用share呢,就是不用設(shè)置用戶(hù)和密碼了; [test] 這個(gè)在Windows中顯示出來(lái)是共享的目錄; path = 可以設(shè)置要共享的目錄放在哪里; writeable 是否可寫(xiě),這里我設(shè)置為可寫(xiě); browseable 是否可以瀏覽,可以;可以瀏覽意味著,我們?cè)诠ぷ鹘M下能看到共享文件夾。如果您不想顯示出來(lái),那就設(shè)置為 browseable=no,guest ok 匿名用戶(hù)以guest身份是登錄; 第二步:建立相應(yīng)目錄并授權(quán) [root@localhost ~]# mkdir -p /opt/test [root@localhost ~]# id nobody uid=99(nobody) gid=99(nobody) groups=99(nobody) [root@localhost ~]# chown -R nobody:nobody /opt/test 注釋?zhuān)宏P(guān)于授權(quán)nobody,我們先用id命令查看了nobody用戶(hù)的信息,發(fā)現(xiàn)他的用戶(hù)組也是nobody,我們要以這個(gè)為準(zhǔn)。有些系統(tǒng)nobody用戶(hù)組并非是nobody ; 第三步:?jiǎn)?dòng)服務(wù)器 第四步:訪問(wèn)Samba 服務(wù)器的共享; 1、在Linux 中您可以用下面的命令來(lái)訪問(wèn); [root@localhost ~]# smbclient -L //liukai或 smbclient //192.168.0.94/test Password: 注:直接按回車(chē) 2、在Windows中,您可以用下面的辦法來(lái)訪問(wèn); \\liukai  或  \\192.168.0.94 3、說(shuō)明:如果用了netbiosname,就可以用“\\主機(jī)名”來(lái)訪問(wèn),如果沒(méi)用netbiosname,就不能用主機(jī)名訪問(wèn)。   第三節(jié)、簡(jiǎn)單的密碼驗(yàn)證服務(wù)器 修改smb.conf文件: security = user guest account = liukai encrypt passwords = yes smb passwd file = /etc/samba/smbpasswd 然后,建立一個(gè)新用戶(hù) useradd liukai passwd liukai 成功后,cat /etc/passwd | mksmbpasswd.sh > /etc/samba/smbpasswd smbpasswd -a liukai 這就成功地添加了一個(gè)smb用戶(hù)。 重啟服務(wù),使用這個(gè)用戶(hù)進(jìn)行登錄即可。    

    標(biāo)簽: samba 嵌入式

    上傳時(shí)間: 2015-05-13

    上傳用戶(hù):yangkang1192

  • VIVADO集成開(kāi)發(fā)環(huán)境時(shí)序約束

    本文主要介紹如何在Vivado設(shè)計(jì)套件中進(jìn)行時(shí)序約束,原文出自Xilinx中文社區(qū)。 Vivado軟件相比于ISE的一大轉(zhuǎn)變就是約束文件,ISE軟件支持的是UCF(User Constraints File),而Vivado軟件轉(zhuǎn)換到了XDC(Xilinx Design Constraints)。XDC主要基于SDC(Synopsys Design Constraints)標(biāo)準(zhǔn),另外集成了Xilinx的一些約束標(biāo)準(zhǔn),可以說(shuō)這一轉(zhuǎn)變是Xilinx向業(yè)界標(biāo)準(zhǔn)的靠攏。Altera從TimeQuest開(kāi)始就一直使用SDC標(biāo)準(zhǔn),這一改變,相信對(duì)于很多工程師來(lái)說(shuō)是好事,兩個(gè)平臺(tái)之間的轉(zhuǎn)換會(huì)更加容易些。

    標(biāo)簽: VIVADO 集成開(kāi)發(fā)環(huán)境 時(shí)序約束

    上傳時(shí)間: 2018-07-13

    上傳用戶(hù):yalsim

  • PCB 焊盤(pán)與孔設(shè)計(jì)工藝規(guī)范

    1. 目的 規(guī)范產(chǎn)品的PCB焊盤(pán)設(shè)計(jì)工藝, 規(guī)定PCB焊盤(pán)設(shè)計(jì)工藝的相關(guān)參數(shù),使得PCB 的設(shè)計(jì)滿(mǎn)足可生產(chǎn)性、可測(cè)試性、安規(guī)、EMC、EMI 等的技術(shù)規(guī)范要求,在產(chǎn)品設(shè)計(jì)過(guò)程中構(gòu)建產(chǎn)品的工藝、技術(shù)、質(zhì)量、成本優(yōu)勢(shì)。 2. 適用范圍本規(guī)范適用于空調(diào)類(lèi)電子產(chǎn)品的PCB 工藝設(shè)計(jì),運(yùn)用于但不限于PCB 的設(shè)計(jì)、PCB 批產(chǎn)工藝審查、單板工藝審查等活動(dòng)。本規(guī)范之前的相關(guān)標(biāo)準(zhǔn)、規(guī)范的內(nèi)容如與本規(guī)范的規(guī)定相抵觸的,以本規(guī)范為準(zhǔn)3.引用/參考標(biāo)準(zhǔn)或資料TS-S0902010001 <〈信息技術(shù)設(shè)備PCB 安規(guī)設(shè)計(jì)規(guī)范〉>TS—SOE0199001 <〈電子設(shè)備的強(qiáng)迫風(fēng)冷熱設(shè)計(jì)規(guī)范〉〉TS—SOE0199002 〈<電子設(shè)備的自然冷卻熱設(shè)計(jì)規(guī)范>>IEC60194 〈<印制板設(shè)計(jì)、制造與組裝術(shù)語(yǔ)與定義>> (Printed Circuit Board designmanufacture and assembly-terms and definitions)IPC—A-600F 〈<印制板的驗(yàn)收條件>〉 (Acceptably of printed board)IEC609504。規(guī)范內(nèi)容4。1焊盤(pán)的定義  通孔焊盤(pán)的外層形狀通常為圓形、方形或橢圓形。具體尺寸定義詳述如下,名詞定義如圖所示。1)   孔徑尺寸:若實(shí)物管腳為圓形:孔徑尺寸(直徑)=實(shí)際管腳直徑+0。20∽0。30mm(8。0∽12。0MIL)左右;若實(shí)物管腳為方形或矩形:孔徑尺寸(直徑)=實(shí)際管腳對(duì)角線的尺寸+0.10∽0。20mm(4.0∽8。0MIL)左右。2)   焊盤(pán)尺寸: 常規(guī)焊盤(pán)尺寸=孔徑尺寸(直徑)+0.50mm(20.0 MIL)左右.…………

    標(biāo)簽: PCB

    上傳時(shí)間: 2022-05-24

    上傳用戶(hù):canderile

  • 微電腦型數(shù)學(xué)演算式隔離傳送器

    特點(diǎn): 精確度0.1%滿(mǎn)刻度 可作各式數(shù)學(xué)演算式功能如:A+B/A-B/AxB/A/B/A&B(Hi or Lo)/|A|/ 16 BIT類(lèi)比輸出功能 輸入與輸出絕緣耐壓2仟伏特/1分鐘(input/output/power) 寬范圍交直流兩用電源設(shè)計(jì) 尺寸小,穩(wěn)定性高

    標(biāo)簽: 微電腦 數(shù)學(xué)演算 隔離傳送器

    上傳時(shí)間: 2014-12-23

    上傳用戶(hù):ydd3625

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