keil4 与 keil5 安装

首先安装了 Keil4 ,配置了nrf51822的环境，然后安装的keil5， http://www2.keil.com/mdk5 1 首先安装：MDK522.exe file:///C:/Keil_v5/ARM/HLP/Release_Notes.htm The next sections list the changes for each release of the MDK-ARM tool

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