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之前可以顺利下载,放了几天重新下载程序就不能了,求各位大神帮忙看一看
用了两种软件,都不能,这是单片机的电路板
建议先查看一下rst、tck和test引脚相关各个焊点,以及相关的电阻、电容情况
或者用示波器观察一下rst、tck和test引脚的时序。