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CC2642R: bootloader backdoor 升级遇到的问题

Part Number: CC2642R


将例程multi_role例程中的Bootloader Backdoor DIO 修改成29 ,Trigger Level of Bootloader Backdoor 低电平有效,

烧录程序后,手机查看有广播,然后P29 接地,按下复位键,蓝牙广播消失,tx(p03)发送数据, 为图中绿色部分,我这边发送 55 55  无回复,问下这个是什么情况,怎么解决这个问题 进入正常的bootloader 后门升级?