How to use nRF52 series to play mp3 audio file

[arctommy20]

Hello Sir,

I will use Nordic nRF52 series(832 or 840) to develop smart bluetooth device. As I need to store mp3 audio files in external flash and then will play mp3 audio file to drive speaker. Do I need to add external DAC (or mp3 decoder) and audio amplifier to meet this requirement? Please suggest decoder and audio amplifier to me for reference. Thanks.
Best Regards,

Thomas

[NewtoM]

Hi Thomas, this is possible. For simple (voice quality) tasks, you can use PWM output (have a look a this thread: https://devzone.nordicsemi.com/f/nordic-q-a/52878/pwm-audio-driver), for high-quality output use e.g. the MAX98357A I2S amplifier. I managed to combine both with a minimalistic mp3 decoder implementation (https://github.com/lieff/minimp3) and they work great. Unfortunately I am not allowed to show full source code, though.