2407上的AD转换功能，很重要的数据采样环节。-This program initializes the ADC module of the　240x and does a conversion of all the analog input channels. The results of the conversion are available in the RESULTSn register, which can be accessed by the user　application. The ADC operates as one 16-state sequencer & the conversions　are stopped once the sequencer reaches EOS (End of sequence)