SD 卡（Secure Digital Memory cARd）是一种为满足安全性、容量、性能和使用环境等各方面的需求而设计的一种新型存储器件，SD 卡允许在两种模式下工作，即SD 模式和SPI 模式，本系统采用SPI 模式。本小节仅简要介绍在SPI 模式下，STM32 处理器如何读写SD 卡，如果读者如希望详细了解SD 卡，可以参考相关资料。
标签： SD卡
上传时间： 2013-11-12
上传用户：huannan88
多媒体卡MMC(MultiMedia cARd)是由美国SanDisk 公司和德国Simens 公司于1997 年共 同开发推出的一种多功能存储卡。内置控制电路，可以使用在手机、数码相机、MP3、PDA 等多种数字设备上，可反复记录30 万次。现在市场上的主流容量有128 MB～2 GB。 文中首先介绍单片机对SPI 协议下的MMC 卡的底层读写操作，然后分析MMC 卡文件系统 的结构，最后详细说明MMC 卡文件的创建、读写、删除等操作。该方法可应用到与Window s 有交互的嵌入式系统中，便于文件的统一管理。
上传时间： 2013-11-05
上传用户：lionlwy
在航电系统维护过程中，为解决定位故障的效率和降低维修成本等问题，提出了基于ICD（Interface Control Document，接口控制文件）的1553B总线的信息监控系统模型。该系统运用数据采集卡对总线中传输的信号有无失真、偏差等电气特性进行检测，并使用1553B通讯卡通过测控软件LabWindows/CVI编程与ICD数据库的动态链接，实现总线信息的解析和故障的判断。与传统的维护过程相比，这种模型能够从信号的电气特性以及信息的解析等全方位的去检测判断故障的来源，并且能够广泛在其他1553B总线系统内扩展应用。验证表明该监控系统可以对总线信息进行快速有效地监测分析，能满足应用需求。 Abstract: In the process of avionics system maintenance， to solve the problems such as improving the efficiency of fast orientation to troubles and reducing maintenance cost， system of 1553B bus information monitor model based on ICD was proposed. The system observed whether the data which transmitted on the bus appear distortion and deviation by using data acquisition cARd. And using 1553B communication cARd programming of the measure software LabWindows/CVI and the dynamic linking of ICD database， message analysis and fault estimation could be realized. Compared with traditional maintenance， this model can all-dimensionally detect and analyze the source of faults from both electrical characteristics of the signal and message analysis， and it can be widely applied in the other 1553B system. Experiment shown that this monitor system can effectively detect and analyze the bus message and can meet the application requirements.
上传时间： 2013-11-23
上传用户：18752787361
AVR32801: UC3A3 Schematic Checklist Features • Power circuit • Reset circuit • USB connection • External bus interface • ABDAC sound DAC interface • JTAG and Nexus debug ports • Clocks and crystal oscillators • MMC, SD-cARd, SDHC, SDIO and CE-ATA interface 1 Introduction A good hardware design comes from a proper schematic. Since UC3A3 devices have a fair number of pins and functions, the schematic for these devices can be large and quite complex. This application note describes a common checklist which should be used when starting and reviewing the schematics for a UC3A3 design.
标签： Schematic 32801 UC3A3 Chec
上传时间： 2014-12-26
上传用户：DXM35
详细介绍了PCI9052接口器件的功能、结构和使用方法，并结合实际给出了基于PCI9052器件开发PCI总线接口卡的应用实例。 Abstract: The main functions,structures and usage of PCI9052inferface chip are introduced in detail in this paper.And an application example of designing PCI bus interface cARd based on PCI9052is proposed in this paper.
上传时间： 2013-10-16
上传用户：togetsomething
MMC/SD卡以其优越的性能，在单片机嵌入式设备中得到广泛应用。将MMC/SD卡作为外部掉电存储介质应用于音频信号发生器中，通过8051F330单片机上的SPI接口，实现单片机—MMC/SD卡的存储扩展，设计了此硬件平台上的MMC/SD卡的单片机驱动程序，并给出了相应的程序代码，满足音频信号发生器的大容量存储要求。 Abstract: MMC/SD cARd is more and more widely used in the single chip embedded devices for their excellent performances.This article introduces the application of MMC/SD cARd as the external power down storage medium in audio signal generator. The extension technology especially for storage of single chip-MMC/SD cARd via SPI interfaces in 8051F330 single chip, including designs single chip drive program of MMC/SD cARd based on hardware platform,and also gives the key coding of the program. The implementation of big capacity storage is meaningful in audio signal generator.
上传时间： 2014-12-27
上传用户：黄华强
针对众多低成本数据采集需求，采用带有片上USB控制器和D/A转换器的混合信号微处理器C8051F340，设计了一款可通过USB接口和LabVIEW图形用户界面实现与PC机联机的数据采集器，同时借助系统的SD卡存储独立实现现场长时间采集数据。该数据采集器成本低，结构简单，体积小，已成功用于工业现场。 Abstract: Aiming at the need of low cost data acquisition, a data acquisition device is designed based on C8051F340 which is a mixed-signal microcontroller and integrates USB controller and A/D controller on a chip.The data acquisition device which can combine with PC by USB interface and LabVIEW graphical user interface,can realize data acquisition. At the same time,it can be solely run a long time in virtue of SD cARd in field.The date aequisition device features low cost,simple structure and little sharp, and it has been used in industry field.
上传时间： 2014-05-31
上传用户：1109003457
将现行的供暖计费方式由按建筑面积计费变为按消耗的热能计费是供暖计费方式发展趋势，为了满足这一计费方式变化的需要，设计了基于IC卡的预付费式新型供暖计费系统，通过测量用户采暖系统进出口的温度和流量，计算用户消耗的热能，利用IC卡记录用户预付费的金额和当年热能的单价，根据热能消耗和当年热能的单价计算用户采暖费，根据实际发生的供暖费用和预付费金额控制供暖的开停，这一计费方式的变化使供暖计费更趋合理。 Abstract: It is trend that the mode of heat charging is changed from billing by building area to by thermal energy. In order to meet the needs of heat charging mode changing， a new system of heat charging based on IC cARd is proposed. The user?蒺s energy consumption is calculated by measuring the user inlet and outlet temperature and flow，using the IC cARd to record the prepaid amount and the current price of heat. The user?蒺s heating costs is calculated according to energy consumption and current price， according to actual heating costs and prepaid amount，the system controls the heating opening or stopping. It is more reasonable that calculated heating costs by user heat consumption
上传时间： 2013-10-14
上传用户：大融融rr
Features• Complete DTMF Receiver• Low power consumption• Internal gain setting amplifier• Adjustable guard time• Central office quality• Power-down mode• Inhibit mode• Backward compatible withMT8870C/MT8870C-1Applications• Receiver system for British Telecom (BT) orCEPT Spec (MT8870D-1)• Paging systems• Repeater systems/mobile radio• Credit cARd systems• Remote control• Personal computers• Telephone answering machine
上传时间： 2013-11-20
上传用户：mpquest
LLCR Pin Socket Testing with the Model 3732 High Density Matrix cARd Computer processors (CPUs) today have come a long way from the computer processors of the past. They draw more power, run at lower voltages, and have more pins than ever before.
上传时间： 2013-10-24
上传用户：whenfly
