Revert "软件触发改为用ADC看门狗中断的方式来寻找触发的位置， 边沿触发包含上升沿和下降沿触发， 修改水平位置左边为最近的AD值， ------------------------------------------------------------------ Change software trigger to the way of ADC watchdog interrupt to find the trigger position , Edge trigger contains the rising and falling, Modify the horizontal position left for the recent AD values,"

This reverts commit 9b7b528b867933af4188846091b5ecb7d804f06c.
ADC看门狗中断的方式来寻找触发的位置方法会导致数据不连贯，特别是2M采样率的时候，所以回溯到软件找触发的方法的版本。
修复LCD第一列有彩条的问题。
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ADC watchdog interrupt the way to find the position trigger method leads
AD data to incoherence, especially when 2M sampling rate, so revert to
the software search trigger position version.
Fix LCD first column with striped problem.