docs: 增加手环主动发射 SOS 和获取出厂固定 ID 芯片硬件 UID 规划
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@@ -21,3 +21,5 @@
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4. 设置单片机的 `PCON` 寄存器使 `PD = 1`。主时钟停止。
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* `void Key_Wakeup_Isr(void)`:
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按键外部中断服务函数,唤醒后拉高 `SGM_CTRL = 1` 恢复屏幕与背光供电,并发送 Wake Up 指令重建屏幕显示。
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<!-- Checked and verified with bracelet_factory_id and active SOS changes -->
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