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请问一下开发板的例程ble_simple_peripheral，显示屏CODEC_TEST怎么测试啊？按了K1切换到这个界面，打印一个大写的E，按K2打印Test_Codec_demo，喇叭只响一声。
或者有没有演示视频中的代码？那个是按K1录音，再按K2播放，sdk中好像没有这个程序的代码