freemodbus

一个基于STM32F103 处理器的飞行控制源码，程序注释全面，结构层次清晰，可实现一键起飞和航向控制功能，详细注释有四元数转欧拉角的全过程，以及PID算法的运算和姿态角的融合，代码简单，适合新手！

C#实现的USB HID设备访问，实现USB设备的数据收发功能(Access to USB HID Device by C# to Realize Data Transmitting and Receiving Function of USB Device)

基于STM8S单片机自身的EEPROM，测试可用。

简单的vc++界面设计，vc++在c++的基础之上加入了界面设计。(Simple vc++ interface design, vc++ in c++ based on joined the interface design.)

郭天祥tx-1c单片机驱动超声波完整程序 超声波为hc-sr04(Debates tx-1c MCU-driven ultrasonic ultrasonic complete program for the hc-sr04)

已经在STM32F103RCT6上移植成功的FreeRTOS嵌入式操作系统。基于STM32F103裸机例程（标准库函数非HAL库）移植FreeRTOS官方源码V9.0.0版本。

zoj094 Matrix multiplication problem is a typical example of dynamical programming. Suppose you have to evaluate an expression like A*B*C*D*E where A,B,C,D and E are matrices. Since matrix multiplication is associative, the order in which multiplications are performed is arbitrary. However, the number of elementary multiplications needed strongly depends on the evaluation order you choose. For example, let A be a 50*10 matrix, B a 10*20 matrix and C a 20*5 matrix. There are two different strategies to compute A*B*C, namely (A*B)*C and A*(B*C). The first one takes 15000 elementary multiplications, but the second one only 3500. Your job is to write a program that determines the number of elementary multiplications needed for a given evaluation strategy. (Matrix multiplication problem is a typical example of dynamical programming. Suppose you have to evaluate an expression like A*B*C*D*E where A,B,C,D and E are matrices. Since matrix multiplication is associative, the order in which multiplications are performed is arbitrary. However, the number of elementary multiplications needed strongly depends on the evaluation order you choose. For example, let A be a 50*10 matrix, B a 10*20 matrix and C a 20*5 matrix. There are two different strategies to compute A*B*C, namely (A*B)*C and A*(B*C). The first one takes 15000 elementary multiplications, but the second one only 3500. Your job is to write a program that determines the number of elementary multiplications needed for a given evaluation strategy. )

各种解决序列问题-solve various problems sequence

TMS320F2812的bios的使用例程，可以使初学者认识bios的优点(TMS320F2812 bios use routines can help beginners understand the advantages bios)