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28335的AD采集到数据不对

使用的方法是:

1、采用内部电压参考;

2、将ADCLO接模拟地;

3、ADCREFIN悬空;

4、采用ADCIN0通道,待测信号“低”接模拟地;

5、采用TI标准例程;

ADC采集一次都未能成功。