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http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=swru270&fileType=pdf
http://processors.wiki.ti.com/index.php/Category:CC2540DK_Mini_BTool_Connection
BTOOL可通过串口向cc2540 usbdongle 发送标准HCI命令。主要用于开发用途。基本就是模拟了一个4.0master设备。