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3v触发的电磁继电器完好，用3.7v锂电池可以触发，但引脚输出无法触发，引脚是正常的
我的想通过代码获得文件夹下的子文件数量
OPENMV可不可以通过代码新建文件夹？
要求在lcd屏幕上显示出设定的字符
