在触摸屏上设置三个按钮，表示三种画板功能：直线、圆和任意手绘线，选择一种功能 后，即可以以这种功能开始用手指在触摸屏上画图。 -Touchscreen in the installation of three button and slate of three functions : straight lines, circles and arbitrary hand-painted lines, choose a function, we can begin to function as

uc/fs文件系统的源码，可配合uc/os构建任意文件系统-uc/fs file system source code, coupled with uc/os build an arbitrary file system

自己写的proteus仿真DAC0808产生任意波形，实际效果很好-proteus simulation source code of arbitrary waveforms. Hardware driver for the DAC0808