2407上的AD转换功能，很重要的数据采样环节。

代码说明：

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)