在需要实时大量输入汉字的显示控制处理应用中,利用传统单片机实现显示控制的设计方法是较难实现的。带汉字字库的液晶模块的使用使得小容量ROM单片机的大量汉字信息输入与显示成为可能。提出了针对汉字字库编码的二级索引拼音输入检索方法,介绍了以ST7920作为控制器的带汉字字库的液晶显示模块的接口方法及汉字显示和控制原理,给出了通用计算机键盘在单片机中的串行接口,采用该技术可大大增强单片机的汉字输入功能。为小容量ROM单片机的大批量汉字信息处理提供了一种汉字输入解决方案。 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.
上传时间: 2013-11-19
上传用户:jhksyghr
为提升虚拟仪器传输速率与实时性能,扩展监测范围,在VC的软件平台上设计了一种全功能虚拟示波器。与传统虚拟示波器相比,该系统采用嵌入式系统完成信号采集,采用工业以太网为传输介质,通过线性插值算法和多线程编程思想,实现波形显示、参数计算、频谱分析以及波形存储及回放功能。实验结果表明,该虚拟示波器可以实现20 kHz采样频率下的波形精确显示,达到预期的各项指标。 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.
上传时间: 2013-11-25
上传用户:wbwyl
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.
上传时间: 2014-12-30
上传用户:aysyzxzm
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.
标签: the applications for processor
上传时间: 2013-12-29
上传用户:稀世之宝039
Programming Embedded Systems in C and C++ is necessary for everyone who want to learn about embedded system
标签: Programming necessary Embedded everyone
上传时间: 2017-07-16
上传用户:大融融rr
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.
标签: the detection function examine
上传时间: 2013-12-18
上传用户:busterman
第一节、samba是干什么的?它有什么用? Samba(SMB是其缩写) 是一个网络服务器,它是Linux作为本地服务器最重要的一个服务,用于Linux和Windows共享文件之用;Samba可以用于Windows和 Linux之间的共享文件,也一样用于Linux和Linux之间的共享文件;不过对于Linux和Linux之间共享文件有更好的网络文件系统 NFS,NFS也是需要架设服务器的; 2、安装及服务操作命令 安装samba程序非常简单,使用rpm -q samba查看当前系统是否已经安装了samba软件。 如果没有那就进入光盘,rpm -ivh *samba*.rpm即可。 仔细说下安装的包: samba-common-3.0.28-0.el5.8 //samba服务器和客户端中的最基本文件 samba-3.0.28-0.el5.8 //samba服务器核心软件包 system-config-samba-1.2.39-1.el5 //samba图形配置界面 samba-client-3.0.28-0.el5.8 //samba客户端软件 启动、暂停和停止服务: /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 第二节、由最简单的一个例子说起,匿名用户可读可写的实现 第一步: 更改smb.conf 我们来实现一个最简单的功能,让所有用户可以读写一个Samba 服务器共享的一个文件夹;我们要改动一下smb.conf ;首先您要备份一下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 & 然后我们把下面这段写入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]这段是全局配置,是必段写的。其中有如下的几行; workgroup 就是Windows中显示的工作组;在这里我设置的是WORKGROUP (用大写); netbios name 就是在Windows中显示出来的计算机名; server string 就是Samba服务器说明,可以自己来定义;这个不是什么重要的; security 这是验证和登录方式,这里我们用了share ;验证方式有好多种,这是其中一种;另外一种常用的是user的验证方式;如果用share呢,就是不用设置用户和密码了; [test] 这个在Windows中显示出来是共享的目录; path = 可以设置要共享的目录放在哪里; writeable 是否可写,这里我设置为可写; browseable 是否可以浏览,可以;可以浏览意味着,我们在工作组下能看到共享文件夹。如果您不想显示出来,那就设置为 browseable=no,guest ok 匿名用户以guest身份是登录; 第二步:建立相应目录并授权 [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 注释:关于授权nobody,我们先用id命令查看了nobody用户的信息,发现他的用户组也是nobody,我们要以这个为准。有些系统nobody用户组并非是nobody ; 第三步:启动服务器 第四步:访问Samba 服务器的共享; 1、在Linux 中您可以用下面的命令来访问; [root@localhost ~]# smbclient -L //liukai或 smbclient //192.168.0.94/test Password: 注:直接按回车 2、在Windows中,您可以用下面的办法来访问; \\liukai 或 \\192.168.0.94 3、说明:如果用了netbiosname,就可以用“\\主机名”来访问,如果没用netbiosname,就不能用主机名访问。 第三节、简单的密码验证服务器 修改smb.conf文件: security = user guest account = liukai encrypt passwords = yes smb passwd file = /etc/samba/smbpasswd 然后,建立一个新用户 useradd liukai passwd liukai 成功后,cat /etc/passwd | mksmbpasswd.sh > /etc/samba/smbpasswd smbpasswd -a liukai 这就成功地添加了一个smb用户。 重启服务,使用这个用户进行登录即可。
上传时间: 2015-05-13
上传用户:yangkang1192
本文主要介绍如何在Vivado设计套件中进行时序约束,原文出自Xilinx中文社区。 Vivado软件相比于ISE的一大转变就是约束文件,ISE软件支持的是UCF(User Constraints File),而Vivado软件转换到了XDC(Xilinx Design Constraints)。XDC主要基于SDC(Synopsys Design Constraints)标准,另外集成了Xilinx的一些约束标准,可以说这一转变是Xilinx向业界标准的靠拢。Altera从TimeQuest开始就一直使用SDC标准,这一改变,相信对于很多工程师来说是好事,两个平台之间的转换会更加容易些。
上传时间: 2018-07-13
上传用户:yalsim
1. 目的 规范产品的PCB焊盘设计工艺, 规定PCB焊盘设计工艺的相关参数,使得PCB 的设计满足可生产性、可测试性、安规、EMC、EMI 等的技术规范要求,在产品设计过程中构建产品的工艺、技术、质量、成本优势。 2. 适用范围本规范适用于空调类电子产品的PCB 工艺设计,运用于但不限于PCB 的设计、PCB 批产工艺审查、单板工艺审查等活动。本规范之前的相关标准、规范的内容如与本规范的规定相抵触的,以本规范为准3.引用/参考标准或资料TS-S0902010001 <〈信息技术设备PCB 安规设计规范〉>TS—SOE0199001 <〈电子设备的强迫风冷热设计规范〉〉TS—SOE0199002 〈<电子设备的自然冷却热设计规范>>IEC60194 〈<印制板设计、制造与组装术语与定义>> (Printed Circuit Board designmanufacture and assembly-terms and definitions)IPC—A-600F 〈<印制板的验收条件>〉 (Acceptably of printed board)IEC609504。规范内容4。1焊盘的定义 通孔焊盘的外层形状通常为圆形、方形或椭圆形。具体尺寸定义详述如下,名词定义如图所示。1) 孔径尺寸:若实物管脚为圆形:孔径尺寸(直径)=实际管脚直径+0。20∽0。30mm(8。0∽12。0MIL)左右;若实物管脚为方形或矩形:孔径尺寸(直径)=实际管脚对角线的尺寸+0.10∽0。20mm(4.0∽8。0MIL)左右。2) 焊盘尺寸: 常规焊盘尺寸=孔径尺寸(直径)+0.50mm(20.0 MIL)左右.…………
标签: PCB
上传时间: 2022-05-24
上传用户:canderile
特点: 精确度0.1%满刻度 可作各式數學演算式功能如:A+B/A-B/AxB/A/B/A&B(Hi or Lo)/|A|/ 16 BIT类比输出功能 输入与输出绝缘耐压2仟伏特/1分钟(input/output/power) 宽范围交直流兩用電源設計 尺寸小,穩定性高
上传时间: 2014-12-23
上传用户:ydd3625