mp2 和mp3 的 音频解码 源码，具体的 我还没看懂

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uart 44b0 rs232 send receive

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两个文件夹：circuit and code ! code 源码包包括3个文件夹： 脚本文件boot ---- 下载down----- 主函数main-Folder 2: circuit and code! Code source packages, including three folders: boot---- download script file down----- main function main-----

44b0 beep gpio beep voice -44b0 beepgpio beep voice

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