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现象：
2640r2f 7x7的官方ble例程移植到5x5版本，插上xds仿真器运行没问题，去掉仿真器 重新上电，晶振只起振很短暂一点时间，然后主晶振和32.768Khz晶振都停了，就再也不起来了。
