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28377用定时器控制AD采样



我这里是用定时器控制AD采样,然后再用SCI将得到的AD数据发送到串口调试助手上。是12的精度采样率为 500 

但是采样计算后的结果却又好多是一样的,这是怎么回事啊?这算是采集对了吗?还是错在哪里了?