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针对工业MP3模块对语音文件的加密需求,简要介绍了SD卡通信方式和硬件加密的原理。对比分析了SD卡硬件加密的特点,对编写加密程序的关键技术中进行了深入的分析和研究,其中包括设置密码、重设密码、上锁与解锁以及强制擦除。通过在SD卡上移植了兼容FAT32的文件系统,能很方便读取MP3文件传送给VS1003进行语音解码。经过严格的测试,实现了带加密功能的MP3播放器,并以工业MP3模块这一实例分析了SD卡硬件加密在实际中的应用。
For the industrial MP3 module encryption requirements for voice files, a brief introduction of the SD card communication and hardware encryption principle. The characteristics of SD card hardware encryption are analyzed and compared. The key technologies of encryption are analyzed and researched in depth, including setting password, resetting password, locking and unlocking, and forced erasing. By porting a FAT32 compatible file system to an SD card, it is easy to read MP3 files and send them to VS1003 for voice decoding. After rigorous testing, the MP3 player with encryption function is realized, and the application of the SD card hardware encryption in practice is analyzed with the example of industrial MP3 module.