基于STM32F4的实时时钟设计

我在使用陈明计先生写的small RTOS和51单片机做过几个小项目，起初都很好，开发变的容易了，程序变的容易修改。后来随着任务个数的增多，RAM很快就不够用了。51系列的芯片内部RAM普遍都是256个,很难找出1024个字节RAM或更多，而价格又合适的。记得上一次我没有办法被迫使用了64K flash内部带768字节的XRAM的51芯片，而我根本用不到那么多flash。-I use Mr. Chen Mingji written small RTOS and 51 MCU done several small projects at first were very good to develop easy to change the program become easier to modify. Subsequently, the increase in the number of tasks, RAM is not fast enough. 51 series of chip RAM are generally 256, it is difficult to find 1024 bytes of RAM or more, while prices will be appropriate. I remember the last time I had no way forced to use a 64K flash with 768 bytes of internal XRAM of 51 chips, and I will never use that much flash.

针对OK2440 ARM920T(S3C2440)的USB设备接口载windows下的驱动-For OK2440 ARM920T (S3C2440) contains the USB device interface of the drive under windows

AT91SAM7 SWI, Remap, GPIO, PIT and stdio Example ( Gamma )

就像在嵌入系统中使用C语言替代汇编一样,在嵌入系统中使用RTOS是大势所趋。原因主要是现在在大多数情况下编程效率比执行效率重要（单片机便宜嘛）。-As in embedded systems using C language as an alternative assembly, the use of RTOS in the embedded systems is a general trend. The main reason is now in most cases more efficient than the implementation of the efficiency of programming important (SCM cheap Well).

这是一个ARM体系的介绍，对ARM编程感兴趣的同同可以-This a system of ARM, the ARM program with the same interest can s

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.

easyarm2013工程模板，这是为开发lpc2103写的模板-easyarm2013 project template for the development of lpc2103 This is the template Writing

audio talktrough code. platform bf533 + audio card.-audio talktrough code. Bf533 platform aud io card.

arm9软中断的一个例子。。。。想要了解swi软中断详细处理过程的朋友可以下-ARM9 soft interrupted an example. . . . Want to learn the soft interrupt SWI detailed friends can deal with the process under

应用背景ADI的DDS芯片AD9834，可以进行扫频，点频程序，实现频率的输出，可以修改后，运用到DSP/ARM等嵌入式芯片中。关键技术兼具点频模式和频率扫描模式;上位机选择工作方式;输入数值，单位：Hz;单片机串口工作方式1，波特率9600