ADC

代码说明：

  DMA1和DMA2同时采集三路的AD值，整体思路是把AD采集的值通过DMA传动到adcbuf,adcbuf3对应的变量内，实时更新，在使用时根据需要的频率进行取对应点的值。(DMA1 and DMA2 simultaneously collect three AD values.The whole idea is to drive the data collected by AD to the variables corresponding to adcbuf and adcbuf3 through DMA, update them in real time, and select the corresponding points according to the frequency needed.)