前一段参考本程序为AT91RM9200开发板添加了一个USB MSD Bulk-Only下载接口，Philips MSD code for the PDIUSBD12D包括完整的源代码，极具参考价值！-earlier reference to the procedures for AT91RM9200 development board adds a USB MSD Bul k-Only download interface, Phil

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前一段参考本程序为AT91RM9200开发板添加了一个USB MSD Bulk-Only下载接口，Philips MSD code for the PDIUSBD12D包括完整的源代码，极具参考价值！-earlier reference to the procedures for AT91RM9200 development board adds a USB MSD Bul k-Only download interface, Phil

For USB program, low pass filter for audio,Audio low-frequency Pass filter.-For USB program, low pass filter for audio, Audio low-frequency Pass filter.