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WSAL22002 – SX1262 XXXM LoRaWAN – GNSS HAT/en

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Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The Waveshare SX1262 XXXM LoRaWAN/GNSS HAT is a Raspberry Pi expansion board using the new-generation SX1262 RF chipset. It supports Sub-GHz bands (433/470 MHz or 868/915 MHz), communicates via SPI, and offers an optional GNSS positioning function with GPS/BD support. The board targets developers of LoRaWAN nodes that connect to networks through gateways such as TTN.

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Technical overview

  • Connects via the standard Raspberry Pi 40-pin GPIO header; communication with the SX1262 uses the SPI bus interface.
  • The BUSY pin indicates chip operating state: low means idle and ready, high means busy; register access is only possible during idle.
  • The RESET signal must be pulled low for at least 100 µs to restore factory settings; it remains high during normal operation.
  • RXEN and TXEN control the RF single-pole switch (SPDT): RXEN low + TXEN high = receive mode; RXEN high + TXEN low = transmit mode.
  • TXEN is connected to BCM(6), RXEN is unused by default (-1); DIO2 is directly connected to RXEN and controls the RF switch during transmission.
  • DIO1 is typically configured as an interrupt output; DIO3 and GPIO4 are reserved pins per datasheet sections 8.3.2 and 8.5.
  • Maximum SPI speed is 18 MHz; register access follows the Opcode + Address + Data pattern per datasheet chapters 8, 10, 11, and 12.
  • The GNSS version includes an L76K module with GPS/BD support and a battery holder for ML1220 rechargeable batteries to preserve data during power loss and enable hot starts.

Commands and examples – verify before use:  

sudo su
sudo apt remove python3-rpi.gpio
sudo apt install python3-rpi.lgpio
wget https://www.waveshare.net/w/upload/a/a1/Sx126x_lorawan_hat_code.zip
unzip Sx126x_lorawan_hat_code.zip
cd sx126x_lorawan_hat_code/python/lora/
python3 setup.py install
cd examples/SX126x/
python3 transmitter.py
python3 receiver_continuous.py
cd sx126x_lorawan_hat_code/python/lora/examples/network
python3 LoRa_simple_node.py
python3 LoRa_simple_gateway.py

Notes and version constraints

  • The current version of the SX1262 XXXM LoRaWAN/GNSS HAT has no TTN-related routines; for TTN server communication, the Pico-LoRa-SX1262-XXXM is recommended instead.
  • The example programs each require two identical HATs for transmitter/receiver tests; a single module alone is insufficient.
  • Firmware modifications (DFU) are not supported; firmware can only be controlled via the demo examples.
  • Version-specific steps may vary depending on software version; verify current compatibility before execution.
  • The GNSS function requires additional hardware (L76K module) and is only available in the GNSS variant.

Source and revision record

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