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自动扫描的问题

我现在自己的小板子9个按键都好了。

还有一个扫描设备的按键,连接键省去了。我已改成自动连接。

可是自动扫描该怎么办呢?弄一个定时器吗?我对OSAL操作系统不熟。

请高手支招,谢谢!