一个4X4的键盘程序设计，希望能对大家有一定的帮助

读招行，建行，工行类磁卡信息 可以正反刷卡源程序-Reading Merchants Bank, China Construction Bank, ICBC type of magnetic card information can be both positive and negative source

PCB电路板。键盘控制，矩阵键盘的电路图。-PCB circuit boards. Keyboard control, matrix keyboard circuit.

With the program AD9854C.exe one can set and tune the frequency in CW-mode. For use as a receiver LO also IF can be given and the both possible receiving frequencies are printed on the screen. The level in Q-outputs can be varied by giving the wanted attenuation in dB. This function is done by controlling a 12b digital multiplier in the device. In this case the level decreases somewhat with increasing frequency as it does in DDS devices. Alternatively the inverse sinc correction can be chosen, in which case the output is flat and high. -With the program AD9854C.exe one can set and tune the frequency in CW-mode. For use as a receiver LO also IF can be given and the both possible receiving frequencies are printed on the screen. The level in Q-outputs can be varied by giving the wanted attenuation in dB. This function is done by controlling a 12b digital multiplier in the device. In this case the level decreases somewhat with increasing frequency as it does in DDS devices. Alternatively t

一个M1读卡器的驱动程序，基于51单片机-an M1 reader of the driver, based on 51 MCU

关于8051单片机的学习，汇编和C语言编程。-On the 8051 study, compile and C language programming.

在MSP430下操作IC卡以及FLASH以及ADS1242-operate under the MSP430 IC cards and FLASH and ADS1242

DDS数字信号发生器,采用AD9835DDS 专用芯片 输出范围1K--10MHZ 采用X25045作看门狗及数据存储器，用于设置各项参数的存储 内含电路图， 源程序 及一些相关资料-DDS digital signal generator, using AD9835DDS ASIC output range 1K-- Knoxville watchdog for the use of X25045 and data memory, used to set various parameters of storage containing circuit, the source and related information

高质量的18b20，显示非常清晰，而且使用1602显示，方便，实惠，值得推荐

输入所需资源,给出常用代码-bring in the necessary resources, is commonly used code

DES算法的ST7单片机实现程序-DES algorithm ST7 MCU procedure