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串口下载工具FR8010H_Download_Tool.exe, 下载sample-code, 除了需要选择dat, 还需要选择key文件，请问：key文件如何生成的呢，有没有相关说明文档
不需要，你可以在官网下载最新版本的FR8000的代码 里面有最新版本的烧录工具