DSP28335源程序 电流采样模块，初始化及采样计算-DSP28335 source， current sampling module, initialization and sampling calculation

DSP28335的AD采样程序，实现将外部模拟量转换成内部数字量的功能(DSP28335's AD sampling program that implements the function of converting external simulations into internal digital quantities)

光伏逆变锁相环，使用DSP28335，实现频率跟踪，首先采样，然后PI，然后输出(Photovoltaic inverter PLL, using DSP28335, to achieve frequency tracking, first sampling, then PI, and then output)