单次多通道adc程序

代码说明：

MSP430F552x Demo - ADC12, Repeated Single Channel Conversions // //  Description: This example shows how to perform repeated conversions on a //  single channel using "repeat-single-channel" mode.  AVcc is used for the //  reference and repeated conversions are performed on Channel A0. Each //  conversion result is moved to an 8-element array called results[].  Test by //  applying a voltage to channel A0, then running. Open a watch window in //  debugger and view the results. Set Breakpoint1 in the index increment line //  to see the array value change sequentially and Breakpoint to see the entire //  array of conversion results in "results[]" for the specified Num_of_Results. //  This can run even in LPM4 mode as ADC has its own clock // //                MSP430F552x //         &nb