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TM4C1231D5PZ程序下载问题

Other Parts Discussed in Thread: TM4C1231D5PZ

工程师: 你好,我在使用TM4C1231D5PZ芯片时,板子可以正常下载程序,但是过一段时间在想烧写程序,我用的是KEil开发环境,JINK下载,但是不可以,界面提示“no cortex m sw device found”,开发环境没有变过,为什么以前下载正常,现在怎么不能正常下载,问题出在什么地方。