Our PIC32 MCUs offer high-resolution audio interfacing for USB applications, enabling higher-quality sound for today's audio designs in an affordable package. Offering scalable performance—from low-cost PIC32MX devices supporting up to 96 kHz audio, to high-performance devices capable of handling up to 192 kHz—these devices are capable of running additional functions including graphics and user interfaces. The following diagram provides a high-level overview of the USB audio functionality supported.
The following are some examples of applications supported in both USB Host Mode and USB Device Mode:
- Mass Storage Device: This provides an interface to a USB thumb drive for audio playback using the FAT file system and Universal Audio Decoders within MPLAB® Harmony.
- Android™ Open Accessory (AoA): Using AOA enables transmission of data between an Android-powered device and an external USB hardware. Moreover, it enables intercommunication control, not just from an Android-powered device to a product, but also from a product to an Android-powered device.
- Headphone: This provides an interface to a headphone that has both speaker and microphone functionality.
- High-Resolution Audio: This delivers up to 192 khz/24-bit audio streamed from the a laptop, for example. The audio is decoded on the laptop and streamed via PCM.
- Audio Device Class (USB 1.0): Examples of USB audio devices include USB speakers, microphones and voice telephony.
- Samsung Audio: Samsung Audio is specific to Samsung devices.
Several demo applications are included within MPLAB Harmony, including:
- mac_audio_hi_res: This demonstration application uses the USB Audio 2.0 Device class to implement a speaker. This application is natively supported on Apple® devices. Microsoft Windows® will require a special driver(1). This is only required for 192 khz audio. Windows supports 96 khz/24-bit audio natively.
- sdcard_usb_audio: The demonstration application creates an audio player that reads audio files (.WAV format only) from an SD card.
- usb_headset: This demonstration application configures a USB headset system with a 48/32/16 kHz sampling rate at 16 bits per sample.
- usb_microphone: This demonstration application configures a USB microphone system operating at a 16 kHz sampling rate with 16-bit data.
- usb_microphone_multirate: This demonstration application configures a USB microphone system operating at a 16 kHz sampling rate with 16-bit data.
- usb_speaker: This demonstration application configures a USB speaker to run at a 48 kHz sampling rate at 16 bits per sample.
These demo applications are available for 96 kHz through 192 kHz audio (mac_audio_hi_res.) Note that an additional Windows driver is also required for 192 kHz and above. Download is available at the bottom of the page.
(1)PIC32 High-Resolution Audio Windows Demo Driver – Provided by Thesycon Software Solutions.
Documentation
- Application Notes
- Data Sheets
Development Tools
- PIC32 Digital Audio Development Boards
- PIC32 Digital Audio Daughter Cards
- 16-bit PIC® MCU and dsPIC® DSC Development Boards for Audio