W5500-EVB-Pico

The W5500-EVB-Pico is a microcontroller evaluation board based on the Raspberry Pi RP2040 and fully hardwired TCP/IP controller W5500 – and basically works the same as Raspberry Pi Pico board but with additional Ethernet via W5500.

../../../../../_images/W5500-EVB-Pico.png

Features

  • RP2040 microcontroller chip

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

  • 264kB of SRAM, and 2MB of on-board Flash memory

  • Castellated module allows soldering direct to carrier boards

  • USB 1.1 Host and Device support

  • 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

  • Ethernet port via WIZnet W5500, hardwired to SPI0 and two GPIO pins.

Supported RP2040 capabilities

  • UART (console port)

    • GPIO 0 (UART0 TX) and GPIO 1 (UART0 RX) are used for the console.

  • I2C

  • SPI (master only)

  • DMAC

  • PWM

  • ADC

  • Watchdog

  • USB device

    • MSC, CDC/ACM serial and these composite device are supported.

    • CDC/ACM serial device can be used for the console.

  • PIO (RP2040 Programmable I/O)

  • Flash ROM Boot

  • SRAM Boot

    • If Pico SDK is available, nuttx.uf2 file which can be used in BOOTSEL mode will be created.

    • Persistent flash filesystem in unused flash ROM

Currently unsupported RP2040 capabilities

  • SPI Slave Mode

  • SSI

  • RTC

  • Timers

Serial Console

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

Buttons and LEDs

User LED controlled by GPIO25.

A BOOTSEL button, which if held down when power is first applied to the board, will cause the RP2040 to boot into programming mode and appear as a storage device to a computer connected via USB. Saving a .UF2 file to this device will replace the Flash ROM contents on the RP2040.

Pin Mapping

Pads numbered anticlockwise from USB connector.

Pad

Signal

Notes

1

GPIO0

Default TX for UART0 serial console

2

GPIO1

Default RX for UART1 serial console

3

Ground

4

GPIO2

5

GPIO3

6

GPIO4

7

GPIO5

8

Ground

9

GPIO6

10

GPIO7

11

GPIO8

12

GPIO9

13

Ground

14

GPIO10

15

GPIO11

16

GPIO12

17

GPIO13

18

Ground

19

GPIO14

20

GPIO15

21

GPIO16

W5500 MISO

22

GPIO17

W5500 CSn

23

Ground

24

GPIO18

W5500 SCLK

25

GPIO19

W5500 MOSI

26

GPIO20

W5500 RSTn

27

GPIO21

W5500 INTn

28

Ground

29

GPIO22

30

Run

31

GPIO26

ADC0

32

GPIO27

ADC1

33

AGND

Analog Ground

34

GPIO28

ADC2

35

ADC_VREF

36

3V3

Power output to peripherals

37

3V3_EN

Pull to ground to turn off.

38

Ground

39

VSYS

+5V Supply to board

40

VBUS

Connected to USB +5V

Other RP2040 Pins

Signal

Notes

GPIO23

Output - Power supply control.

GPIO24

Input - High if USB port or Pad 40 supplying power.

GPIO25

Output - On board LED.

ADC3

Input - Analog voltage equal to one third of VSys voltage.

Separate pins for the Serial Debug Port (SDB) are available

Power Supply

The W5500-EVB-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 W5500-EVB-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.

Installation

  1. Download Raspberry Pi Pico SDK

$ git clone -b 2.0.0 https://github.com/raspberrypi/pico-sdk.git

  1. Set PICO_SDK_PATH environment variable

$ export PICO_SDK_PATH=<absolute_path_to_pico-sdk_directory>

  1. Configure and build NuttX

$ git clone https://github.com/apache/nuttx.git nuttx
$ git clone https://github.com/apache/nuttx-apps.git apps
$ cd nuttx
$ make distclean
$ ./tools/configure.sh w5500-evb-pico:usbnsh
$ make V=1

  1. Connect W5500-EVB-Pico board to USB port while pressing BOOTSEL. The board will be detected as USB Mass Storage Device. Then copy “nuttx.uf2” into the device. (Same manner as the standard Pico SDK applications installation.)

  2. usbnsh configuration provides the console access by USB CDC/ACM serial devcice. The console is available by using a terminal software on the USB host.

Configurations

usbnsh

USB CDC/ACM serial console with NuttShell. TCP/IPv4 & IPv6 networking is supported via the Ethernet port.

License exceptions

The following files are originated from the files in Pico SDK. So, the files are licensed under 3-Clause BSD same as Pico SDK.

Created by referring to the Pico SDK clock initialization

  • arch/arm/src/rp2040/rp2040_clock.c

  • arch/arm/src/rp2040/rp2040_pll.c

  • arch/arm/src/rp2040/rp2040_xosc.c

Providing an API similar to the Pico SDK’s hardware_pio API

  • arch/arm/src/rp2040/rp2040_pio.c

  • arch/arm/src/rp2040/rp2040_pio.h

  • arch/arm/src/rp2040/rp2040_pio_instructions.h

Generated from rp2040.svd originally provided in Pico SDK

  • arch/arm/src/rp2040/hardware/*.h