SD插卡小音箱的单片机源代码，高度集成，一颗单片机可以完成解码和播放的功能-SD card small speakers microcontroller source code, and a high degree of integration, one the MCU can complete decoding and playback function

SD卡读卡器原理图和程序，源代码是用C语言编写的。-SD card reader schematic and procedures, source code is written using C language.