是des的一种算法,被称为计数器模式(counter mode)
上传时间: 2014-11-27
上传用户:大三三
Vxworks 下的视频采集程序,该驱动程序是PCI类视频卡,测试程序为:test.cpp 通过初始化后,运行UTL_LVE("1.mpg",5,1),将视频文件保存为1.mpg。 其中1.mpg为文件名,5为时间秒,1为mode。
上传时间: 2017-01-29
上传用户:miaochun888
本例展示了如何利用外设TIM2来产生四路频率不同的信号。 TIM2时钟设置为36MHz,预分频设置为2,使用输出比较-翻转模式(Output Compare Toggle Mode)。 TIM2计数器时钟可表达为:TIM2 counter clock = TIMxCLK / (Prescaler +1) = 12 MHz 设置TIM2_CCR1寄存器值为32768,则CC1更新频率为TIM2计数器时钟频率除以CCR1寄存器值,为366.2 Hz。因此,TIM2通道1可产生一个频率为183.1 Hz的周期信号。 同理,根据寄存器TIM2_CCR2 、TIM2_CCR3和 TIM2_CCR4的值,TIM2通道2可产生一个频率为366.3 Hz的周期信号;TIM2通道3可产生一个频率为732.4 Hz的周期信号;TIM2通道4可产生一个频率为1464.8 Hz的周期信号。 可以通过示波器观察各路输出
上传时间: 2014-01-22
上传用户:plsee
Free open-source disk encryption software for Windows Vista/XP, Mac OS X, and Linux Main Features: * Creates a virtual encrypted disk within a file and mounts it as a real disk. * Encrypts an entire partition or storage device such as USB flash drive or hard drive. * Encrypts a partition or drive where Windows is installed (pre-boot authentication). * Encryption is automatic, real-time (on-the-fly) and transparent. * Provides two levels of plausible deniability, in case an adversary forces you to reveal the password: 1) Hidden volume (steganography) and hidden operating system. 2) No TrueCrypt volume can be identified (volumes cannot be distinguished from random data). * Encryption algorithms: AES-256, Serpent, and Twofish. Mode of operation: XTS. Further information regarding features of the software may be found in the:http://www.truecrypt.org/
标签: open-source encryption Features software
上传时间: 2013-12-20
上传用户:123啊
采用VHDL语言设计一个4通道的数据采集控制模块。系统的功能描述如下: 1.系统主时钟为100 MHz。 2.数据为16位-数据线上连续2次00FF后数据传输开始。 3.系统内部总线宽度为8位。 4.共有4个通道(ch1、ch2、ch3、ch4),每个通道配备100 Bytes的RAM,当存满数据后停止数据采集并且相应通道的状态位产生报警信号。 5.数据分为8位串行输出,输出时钟由外部数据读取电路给出。 6.具备显示模块驱动功能。由SEL信号设置显示的通道,DISPLAY信号启动所选通道RAM中数值的显示过程。数值顺次显示一遍后显示结束,可以重新设定SEL的值选择下一个通道。模块数据线为8位,显示器件为4个8段LED。 7.数据采集模式如下:单通道采集(由SEL信号选择通道),多通道顺次采集(当前通道采满后转入下一通道),多通道并行采集(每通道依次采集一个数据)。模式由控制信号MODE选择,采集数据的总个数由NUM_COLLECT给出。 8.数据采集过程中不能读取,数据读取过程中不能采集
上传时间: 2013-12-25
上传用户:zycidjl
The SP486 and SP487 are low–power quad differential line drivers meeting RS-485 and RS-422 standards. The SP486 features a common driver enable control the SP487 provides independent driver enable controls for each pair of drivers. Both feature tri–state outputs and wide common–mode input range. Both are available in 16–pin plastic DIP and SOIC packages.
标签: differential and standard drivers
上传时间: 2014-01-13
上传用户:tianyi223
Murphy 大俠 GPL 的 C++/x86 RTOS, 支持 MMU, 用戶/核心 模式區隔. http://hpc.ee.ntu.edu.tw/~murphy/me/EKernel.html part 2 of 3: user mode LIB
标签: EKernel Murphy murphy RTOS
上传时间: 2013-12-23
上传用户:小鹏
cordic methods describe essentially the same algorithm that with suitably chosen inputs can be used to calculate a whole range of scientific functions including sin, cos, tan, arctan, arcsin, arccos, sinh, cosh, tanh, arctanh, log, exp, square root and even multiply and divide. the method dates back to volder [1959], and due to its versatility and compactness, it made possible the microcoding of the hp35 pocket scientific calculator in 1972. here is some code to illustrate the techniques. ive split the methods into three parts linear, circular and hyperbolic. in the hp35 microcode these would be unified into one function (for space reasons). because the linear mode can perform multiply and divide, you only need add/subtract and shift to complete the implementation. you can select in the code whether to do the multiples and divides also by cordic means. other multiplies and divides are all powers of 2 (these dont count). to eliminate these too, would involve ieee hackery.
标签: essentially algorithm describe suitably
上传时间: 2017-03-02
上传用户:litianchu
介绍计算机上实现gsm modem短消息收发的模式,描述gsm modem PDU 模式,包括PDU 模式下的gsm modem模块UCS2 编码、解码原理,以及gsm modem发送与接收PDU 串的编制方式, VB 中的MSCOMM 控件,实现gsm modem短消息收发的核心内容。-briefed on computer modem gsm SMS transceiver model, described GSM modem PDU models, including the PDU mode GSM modem module UCS2 encoding, decoding principle, and GSM modems send and receive PDU Series presentation, the VB MSCOMM Control and achieve short GSM modem news transceiver core content
上传时间: 2017-03-10
上传用户:cxl274287265
//获得当前的模式 oldmode = vga_getcurrentmode[] //初始化 vga_init[] //判断是否支持该模式 if[vga_hasmode[mode]] vga_setmode[mode] else { printf["No such mode\n"] exit[1] } //取得信息 width = vga_getxdim[] height = vga_getydim[] colors = vga_getcolors[] //绘图 for[i=0 i<colors i++]{ vga_setcolor[i] vga_drawline[0, i, width-1, i] }
标签: vga_getcurrentmode vga_init oldmode vga_ha
上传时间: 2014-12-19
上传用户:maizezhen