Adafruit Feather RP2040

The Feather RP2040 is a general purpose RP2040 board supplied by Adafruit.

../../../../../_images/Feather.png

Features

  • RP2040 microcontroller chip

  • Dual-core ARM Cortex M0+ processor, flexible clock running up to 133 MHz

  • 264kB of SRAM, and 8MB of on-board Flash memory

  • Castellated module allows soldering direct to carrier boards

  • USB Host and Device support via type C connector.

  • Low-power sleep and dormant modes

  • Drag & drop programming using mass storage over USB

  • 26 multi-function GPIO pins

  • 2× SPI, 2× I2C, 2× UART, 3× 12-bit ADC, 16× controllable PWM channels

  • Accurate clock and timer on-chip

  • Temperature sensor

  • Accelerated floating point libraries on-chip

  • 8 × Programmable IO (PIO) state machines for custom peripheral support

  • LiPoly Battery connector

Serial Console

By default a serial console appears on pins 14 (RX GPIO0) and pin 15 (TX GPIO1). This console runs a 115200-8N1.

The board can be configured to use the USB connection as the serial console.

Buttons and LEDs

User LED controlled by GPIO13.

A ws2812 (NeoPixel) smart RGB LED controlled by GPIO16.

An LED (CHG LED) that indicates the charging status of connected LiPo cell.

There is a BOOT button which if held down when power is first applied or the RESET button is pressed will cause the RP2040 to boot into program mode and appear as a storage device to a USB connecte . Saving a .UF2 file to this device will replace the Flash ROM contents on the RP2040.

A RESET button that allows rebooting the board without disconnecting the power.

Pin Mapping

Pads numbered anticlockwise from USB connector.

Pad

Signal

Notes

1

Reset

Pull to ground to reset the RP2040 processor.

2

3.3V

Power out to peripherals.

3

3.3V

Power out to peripherals.

4

Ground

5

GPIO26

ADC0

6

GPIO27

ADC1

7

GPIO28

ADC2

8

GPIO29

ADC3

9

GPIO24

10

GPIO25

11

GPIO18

12

GPIO19

13

GPIO20

14

GPIO1

Default RX for UART1 serial console

15

GPIO0

Default TX for UART0 serial console

16

GPIO6

17

GPIO2

18

GPIO3

19

GPIO7

20

GPIO8

21

GPIO9

22

GPIO10

23

GPIO11

24

GPIO12

25

GPIO13

26

VBUS

Connected to USB +5V

27

EN

Pull to ground to turn off 3.3V regulator.

28

VBAT

Connected to LiPo battery 3.3V.

The board has a STEMMA QT connector that is also connected to pins GPIO2 (I2C1 SDA) and GPIO3 (I2C1 SDA).

The board has a two pin JST PH socket that accepts a single 3.3V LiPo cell. The cell connected to this port can be charged by connecting the board to a USB power supply.

There are solder pads on the board that allow the addition of a 10-pin serial debug (SWD) connector.

Power Supply

The Raspberry Pi Pico can be powered via the USB connector, or by supplying +5V to pin 39. The board had a diode that prevents power from pin 39 from flowing back to the USB socket, although the socket can be power via pin 30.

The Raspberry Pi Pico chip run on 3.3 volts. This is supplied by an onboard voltage regulator. This regulator can be disabled by pulling pin 37 to ground.

The regulator can run in two modes. By default the regulator runs in PFM mode which provides the best efficiency, but may be switched to PWM mode for improved ripple by outputting a one on GPIO23.

Configurations

audiopack

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for NSPlayer audio player.

composite

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for CDC/ACM with MSC USB composite driver.

displaypack

NuttShell configuration (console enabled in USB Port, at 115200 bps) supporting ST7789 video display.

enc28j60

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for NC28J60.

lcd1602

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for LCD1602.

nsh

Basic NuttShell configuration (console enabled in UART0, at 115200 bps).

nsh-flash

Basic NuttShell configuration (console enabled in UART0, at 115200 bps with SMART flash filesystem.

nshsram

NuttShell configuration (console enabled in UART0, at 115200 bps) with interrupt vectors in RAM.

smp

Basic NuttShell configuration (console enabled in UART0, at 115200 bps) with both ARM cores enabled.

spisd

NuttShell configuration (console enabled in UART0, at 115200 bps) with SPI configured.

ssd1306

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for ssd1306.

st7735

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for st7735.

usbmsc

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for usbmsc.

usbnsh

Basic NuttShell configuration (console enabled in USB Port, at 115200 bps).

waveshare-lcd-1.14

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for st7789.

waveshare-lcd-1.3

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for usbmsc.