快速傅立叶变换FFT C代码

客户端和服务器端的聊天室范例客户端和服务器端的聊天室范例(Client and server side of the chat room example client and server-side chat room paradigm)

创建多级目录(The example of creating multilevel dir)

　蔡勒（Zeller）公式：是一个计算星期的公式。 　　随便给一个日期，就能用这个公式推算出是星期几。(Zeller (Zeller) formula: It is a formula for calculating week. Casual to a date, can be calculated using this formula out of the week.)

说明：  针对两种flash所写的读写程序,公布我原来写的针对两种flash所写的读写程序，用的单片机是51系列！(against two flash reader written procedures, I was originally announced against two flash reader written procedures, the MCU is 51!)

说明：  关于nordic的BLE蓝牙空中升级详细流程(about ble nordic nrf5X dfu update)

渗流计算，渗流浸润线的计算，溢出点高程的确定(seepage computation)

能够实现AES加密解密的功能，已经过测试可以使用(Enables AES encryption and decryption functions, have been tested can be used)

stm32硬件SPI方式控制ADS1247采样驱动程序(stm32 hardware SPI driver controls the ADS1247 sampling)

一个驱动级的防火墙源程序，基于ndis hook，可以设定外部设定过滤规则，(A drive source firewall level, based on ndis hook, set the filter can be set to external rules,)

利用在STM32处理器上的，红外测温传感器的应用(Take advantage of the STM32 processor, the application of infrared temperature sensor)