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类似的蓝牙耳机或其他蓝牙设备连接了手机以后会有个电量信息提醒。
1、CC2640链接手机后如何显示电量信息？是哪条指令
2、如果电压过低了。蓝牙耳机通常会给手机发条指令，手机会有弹窗报警提醒蓝牙耳机没电。这种用CC2640如何实现？
