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01 / Embedded systems

nRF52840 Wireless Audio Link

A one-way digital audio connection designed around Nordic Enhanced ShockBurst, packet integrity, and practical bandwidth constraints.

PCM2706→I2S→nRF TX→ESB→nRF RX→I2S→PCM5102
2 Mbit/sNordic ESB radio link
48 kHzStereo source input
8 kHz8-bit mono radio payload
System architecture

PCM2706 I2S source → XIAO nRF52840 transmitter → 2 Mbit/s Nordic ESB link → XIAO nRF52840 receiver → PCM5102 DAC.

Signal handling

Converted 48 kHz, 16-bit stereo input to an 8 kHz, 8-bit mono stream before packaging each 20 ms audio block into eight 32-byte packets.

Reliability

Implemented CRC-16 validation, acknowledgements and retry behavior, sequence checks, and link-loss recovery for a more dependable one-way connection.