Check Card Type V2.2.0 release

条形码程序测试，对条马的打印测试程序，用户可以下载自已测试使用。(barcode testing procedures, the right of the horse's Print testing procedures, users can download their own test to use.)

模拟三维液滴下落飞溅，加入扰动使用周期性边界条件(Simulate 3D drop drop splashes, add disturbances using periodic boundary conditions)

合众达开发板seed-dec5502正弦波产生实验源代码(Triangle up development board seed-dec5502 Sine test source code)

字符设备USB驱动，需要一个应用程序调用测试(Character Device USB Driver)

duilib界面库缺少阴影，这段代码能给duilib的窗口阴影效果。(duilib interface library lacks shadows, give the code window of the shadow effect duilib.)

说明：  利用stm32实现四路pwm输出，使用一个定时器实现功能。(Realization of four-way PWM output by stm32)

完整的DSP C28系列电机控制代码，包括同步机和异步机控制，包括详细的说明文档，说明文档具体到每个功能模块：Park变换，转速观测，磁通观测，电流控制器，转速控制器等。(Motor control code for DSP C28.)

说明：  实现DSP28335内的SCI通信程序，经过测试后可以使用(Implement the SCI communication program in DSP28335, which can be used after testing)

qgis 地图二次开发，为初学者尽快掌握地图开发。对大家有很大帮助(Two the development of QGIS map, for beginners to quickly master the map development. There is a great help to you)

说明：  三维均匀介质的高阶交错网格弹性波方程数值模拟（未加PML吸收边界条件），模拟结果以切边形式显示(Numerical simulation of three-dimensional homogeneous medium of high-order staggered elastic wave equation (not PML absorbing boundary conditions), the simulation results are displayed in the form of trimming)