Jilin Nengxing Electrical Equipment Co. Ltd. , https://www.nengxingelectric.com
Application of STC89C58RD+ MCU in MP3 Player Design (1)
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MP3 players have become increasingly popular due to their compact size and high-quality sound. Initially, MP3 files were played on computers, but with the rise of the internet, dedicated MP3 players emerged. These devices have evolved over time, becoming more compact, user-friendly, and feature-rich. Today, most MP3 players integrate both the decoder and memory in one unit, making them easy to carry but limiting expandable storage and versatility. To address these issues, separating the player from the memory has become a key development direction.
This system utilizes the STC89C58RD+ microcontroller along with the CH375 USB interface chip, the VS1011E audio decoder, and the Nokia 5110 LCD to create a functional MP3 player. The system reads MP3 files from a U-disk in USB-HOST mode, decodes them, and supports features like reading music tags, viewing e-books, and playing Snake games.
The overall system design includes a data reading module, an audio decoding module, and a display module. Upon startup, the STC89C58RD+ MCU retrieves MP3 data from the U-disk via the CH375 chip and stores it in internal RAM for buffering. It then sends the data to the VS1011E for decoding and outputs the audio to headphones or speakers. Users can control playback functions like play, stop, next/previous track, and volume adjustment using a keyboard, while the Nokia 5110 LCD displays the current status.
The STC89C58RD+ is a powerful 51-series microcontroller with 32KB of FLASH, 16KB of EEPROM, and 1KB of SRAM, allowing it to handle large data buffers efficiently. It operates at up to 33MHz, which is sufficient for the system’s requirements.
The CH375 chip acts as a USB interface, supporting both USB-HOST and USB-SLAVE modes. It includes built-in USB protocols, reducing the need for external firmware and simplifying integration with the microcontroller.
The VS1011E is a third-generation audio decoder capable of handling MP3, WMA, and MIDI formats. It includes a DSP core, RAM, and various interfaces for audio processing and output. Its workflow involves receiving audio data, decoding it, adjusting bass and treble, and finally sending the processed signal to the headphone amplifier.
Overall, this MP3 player system demonstrates a practical approach to integrating hardware and software for efficient audio playback, offering flexibility and expandability beyond traditional designs.