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cc2530在下载程序时,提示识别设备失败,会是什么问题呢?

Other Parts Discussed in Thread: CC2530

cc2530在下载程序时,提示 ,检查了电源和接线都没有问题,也换了cc2530芯片了,会是什么问题呢,在调试的时候,调试接口引脚的电平是什么样子的,哪个为高电平,哪个为低电平呢?