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你好，请教一下通过TMS320C5535开发板的J3 line in口录音生成录音文件保存到开发板自带的SD卡上，再通过控制SD卡实现录音从J4 line out口播放，这样的思路TMS320C5535可以用软件控制实现吗？好像还要用到按键控制。
请问“还要用到按键控制”是指什么按键？
奥，是开发板上的按键，sw1,sw2
