STM32F4发现USB测试

有关2812的一些文章，包括测频、数字滤波和采样等-2812 relating to a number of articles, including frequency measurement, digital filtering and sampling, etc.

STM32 MP3 播放的实现代码，可以在开发板上直接运行，使用方便快捷，具体内容请看代码，具体使用方法可以参考文章http://www.openedv.com/posts/list/36595.htm。

KEIL FOR ARM RTOS.rar　是keil公司开发的针对ＡＲＭ的实时操作系统．-KEIL FOR ARM RTOS.rar is keil developed real-time operating system for ARM.

S08例程：本程序是I2C模块的例程，所用资源为单片机内部集成总线I2C模块，所接器件为24C04-S08 routines: This procedure is routine I2C module, the resources used for the single-chip integrated I2C bus module, the access device for the 24C04

这是 59:99 计时器倒计数，按下按钮它将重置为 59:99，当计时器获取到 00:00 3 发光二极管轮流。 主要的这是最令人渴望的作业在微实验室之一。

FM25L256B是采用先进的铁电技术制造的256Kb非易失性存储器。铁电随机存储器（FRAM）具有非易失性，并且可以象RAM一样快速读写。数据在掉电后可以保存10年，同时消除由EEPROM和其他非易失性存储器导致的复杂性，开销和系统级别可靠性问题。 -FM25L256B is the use of advanced technology manufacturing ferroelectric 256Kb nonvolatile memory. Ferroelectric random access memory (FRAM) with a non-volatile, and can read and write as quickly as RAM. Data can be saved in the power-down after 10 years, while eliminating by EEPROM and other nonvolatile memory led to the complexity, overhead and system level reliability problems.

EasyARM2131开发板源码之一___________1．GPIO输出实验－蜂鸣器控制-EasyARM2131 development board ___________1 one source. GPIO output experimental- control buzzers

SC44B0的测试程序，此程序为4*4键盘的测试程序，基于扫描式读取键值并在LED上显示。-SC44B0 testing procedures, the procedures for the 4* 4 keyboard testing procedures based on scan-read keys on the LED display.

可以加载到嵌入式系统终端的鼠标驱动程序，实现了鼠标初始化，鼠标数据读写及复位等功能。-can be loaded to end embedded systems mouse drivers, achieved a mouse initialization, reading and writing data on the mouse and reset functions.

EasyARM2131开发板源码之一--- -----5．IOPIN的特殊应用-EasyARM2131 one source development board----------- 5. The special application IOPIN