ST-link无法下载—— “ access port fault. check the access port selection and ensure it fits the debugging

ST-Link下载报错: “ access port fault. check the access port selection and ensure it fits the debugging context ” 无法下载代码,已经多次检查了下载口引脚(TMS和TCLK)和芯片引脚连接完好,芯片未烧坏,5v供电,稳压功能正常(3.3v),程序0 error , 0 warring; debug
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