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DM6437开发板连接仿真器

一般可以顺利连接。有时候突然连接不上,如图,重新连接多次依然不行。这时连接其他开发板没有问题。而此时连接不上的这块板子过一些时间又再次可以连接。不知道是什么原因,求解决方法呀