Hackers uncover SDR capabilities in ESP32 and LoRa chips
Independent researchers have discovered ways to access raw IQ data and transmission capabilities in common chips like the ESP32 and LR2021 LoRa.
Summary
A series of independent discoveries has revealed software-defined radio (SDR) functionality in hardware previously thought to be limited. Researchers found a debug mode in the ESP32 family that allows access to raw radio data upstream of the MAC hardware, while others have successfully implemented transmission. Additionally, SDR capabilities have been identified in the LR2021 LoRa chip, covering frequencies from 150 MHz to 960 MHz.
Unlocking hidden radio hardware
- ESP32 discovery: A secret debug mode allows access to raw IQ data, bypassing the standard MAC hardware conversion.
- Transmission support: Researchers have implemented TX functionality and integrated it with the osmosdr data flow.
- LR2021 LoRa chip: Provides 16-bit resolution SDR capabilities across the 150 MHz to 960 MHz spectrum.
- Tool compatibility: New ESP32 implementations are becoming compatible with existing SDR software ecosystems.
Why it matters
These discoveries lower the barrier to entry for digital radio experimentation by repurposing widely available, low-cost silicon for SDR tasks.
Original reference: hackaday.com →