Design and implementation of MP3 player based on STM32 (MDK complete source code provided)

The design will introduce a design example that uses an STM32 processor to implement a simple MP3 Player. This comprehensive application example will help readers understand the applications of STM32, SPI interface, SD card, TIMER, interrupt, FAT file system, USB, etc.
Two design solutions are provided here. The first solution is a simple sound wave player, using only the STM103V100 evaluation board, making the timer TIM4 work in PWM mode, and reading the sound wave file in wav format from the SD card, generated by TIM4 Square waves of different frequencies are sent to the speakers through low-pass filters and amplifiers, as shown in Figure 1; the second solution is a simple MP3 player, which also requires the use of an additional decoding chip to read MP3 format files from the SD card. , and then send the decoding chip to decode and play, as shown in Figure 2. This section will first introduce the SD card, FAT16 file format, VS1003 codec and other key parts, and then give the software design of the two design solutions.