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fuchong,
蓝牙4.0协议:BR/EDR(标准蓝牙)+ BLE 目前CC2540硬件只支持BLE这种单模无线标准,不能够与4.0以前的版本通信。
使用ble单模芯片做主设备是可行的,不过只允许支持ble的设备接入。