Design of Cortex-M4F-Based Intelligent Audio Player

Abstract

This design overcomes disadvantages of traditional MP3 players which include few supported file formats, absence of intelligent interface and incapability of replacing storage devices. In this system, the latest ARM® CortexTM-M4F-based STM32F4 chip is adopted to be the host controller to read out audio files stored in Secure Digital (SD) memory card via SPI2 and send the data into VS1003 via SPI1. VS1003 chip decodes and plays audio files. Meanwhile, the song information and lyrics are displayed on Thin Film Transistor (TFT) LCD which integrates with touch panel to realize song switchover and volume adjusting and other control functions. The separation of decoding module and storage module makes it possible to expand capacity and share music. Experimental results show that the data transmission speed is enhanced for the adoption of SD card. In addition, the number of audio file formats supported by this system is greater than the traditional MP3 players'.