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boards/adafruit/feather_rfm95_rp2040/doc/index.rst

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.. zephyr:board:: adafruit_feather_rfm95_rp2040

Overview

The Adafruit Feather RP2040 with RFM95 LoRa Radio_ is a board based on the RP2040 microcontroller from Raspberry Pi Ltd. The board has a RFM95 LoRa radio operating at 915 MHz, and a Stemma QT connector for easy sensor usage. It is compatible with the Feather board form factor, and has a USB type C connector.

Hardware

  • Microcontroller Raspberry Pi RP2040, with a max frequency of 133 MHz
  • Dual ARM Cortex M0+ cores
  • 264 kByte SRAM
  • 8 Mbyte QSPI flash
  • 17 GPIO pins
  • 4 ADC pins
  • I2C
  • SPI
  • UART
  • USB type C connector
  • Reset and boot buttons
  • Red LED
  • RGB LED (Neopixel)
  • Stemma QT I2C connector
  • RFM95 LoRa 915 MHz radio with antenna connector
  • Built-in lithium ion battery charger

Default Zephyr Peripheral Mapping

.. rst-class:: rst-columns

- A0 ADC0 : GPIO26
- A1 ADC1 : GPIO27
- A2 ADC2 : GPIO28
- A3 ADC3 : GPIO29
- D24 : GPIO24
- D25 : GPIO25
- SCK SPI1 SCK : GPIO14
- MO SPI1 MOSI : GPIO15
- MI SPI1 MISO : GPIO8
- RX UART0 : GPIO1
- TX UART0 : GPIO0
- GND : -
- SDA I2C1 : GPIO2
- SCL I2C1 : GPIO3
- D5 : GPIO5
- D6 : GPIO6
- D9 : GPIO9
- D10 : GPIO10
- D11 : GPIO11
- D12 : GPIO12
- D13 and red LED : GPIO13
- Button BOOT : GPIO7
- RGB LED (Neopixel) signal : GPIO4
- LORA radio CS : GPIO16
- LORA radio RESET : GPIO17
- LORA radio IO0 : GPIO21
- LORA radio IO1 : GPIO22
- LORA radio IO2 : GPIO23
- LORA radio IO3 : GPIO19
- LORA radio IO4 : GPIO20
- LORA radio IO5 : GPIO18

The LORA radio is also connected to the SPI1 pins SCK, MOSI and MISO.

See also pinout_ and schematic_.

Supported Features

.. zephyr:board-supported-hw::

Programming and Debugging

.. zephyr:board-supported-runners::

The Adafruit Feather RP2040 with RFM95 LoRa Radio board does not expose the SWDIO and SWCLK pins, so programming must be done via the USB port. Press and hold the BOOT button, and then press the RST button, and the device will appear as a USB mass storage unit. Building your application will result in a :file:build/zephyr/zephyr.uf2 file. Drag and drop the file to the USB mass storage unit, and the board will be reprogrammed.

For more details on programming RP2040-based boards, see :ref:rpi_pico_programming_and_debugging.

Flashing

To run the :zephyr:code-sample:blinky sample:

.. zephyr-app-commands:: :zephyr-app: samples/basic/blinky/ :board: adafruit_feather_rfm95_rp2040 :goals: build flash

Also try the :zephyr:code-sample:led-strip, :zephyr:code-sample:input-dump, :zephyr:code-sample:input-dump, :zephyr:code-sample:usb-cdc-acm-console, :zephyr:code-sample:adc_dt, :zephyr:code-sample:lora-send and :zephyr:code-sample:lora-receive samples.

The Stemma QT connector can be used to read sensor data via I2C, for example the :zephyr:code-sample:accel_polling sample:

.. zephyr-app-commands:: :zephyr-app: samples/sensor/accel_polling :board: adafruit_feather_rfm95_rp2040 :shield: adafruit_lis3dh :goals: build flash

References

.. target-notes::

.. _Adafruit Feather RP2040 with RFM95 LoRa Radio: https://learn.adafruit.com/feather-rp2040-rfm95

.. _pinout: https://learn.adafruit.com/feather-rp2040-rfm95/pinouts

.. _schematic: https://learn.adafruit.com/feather-rp2040-rfm95/downloads