STM32F1-series-MP3 STM32 software-based mp3 player via SD card (SDIO 4bits) How to use: Open this project with the stm32cube mx to modify the project. This project is based on Keil MDK 5 version Designer are welcome to use the latest STMCUBE IDE as well. This is a STM32F1 series-based soft mp3 player utilizing the helix mp3 decode library. Please format the SD card to FAT32 and create a folder named as music, where mp3 and wave files should put into the folder accordingly. As always, have fun =] Bloack Diagram: