Published April 12, 2021 © MIT

How to add W5500 Ethernet to Raspberry Pi Pico (Python) - 2

HOWTO: Raspberry Pi Pico + WIZnet W5500 Ethernet + CircuitPython - DHCP + Echo + WebClient (html, JSON) Demo

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How to add W5500 Ethernet to Raspberry Pi Pico (Python) - 2

Things used in this project

Hardware components

Raspberry Pi Pico

Adafruit Ethernet FeatherWing

WIZnet W5500

Story

1. Preview

Need to install CircuitPython on Raspberry Pi Pico board. because we can use WIZNET5K library for W5500 Ethernet function. For more detail, I already upload 1st project with Raspberry Pi Pico, WIZ850io (W5500), Circuit Python env., Hardware connection, Ping demo example. Please visit the below project first.

https://www.hackster.io/bjnhur/how-to-add-w5500-ethernet-to-raspberry-pi-pico-python-1-c7340c

2. DHCP Example

visit my source repo.

https://github.com/bjnhur/pico-W5500

Download (or fork, copy,...) samples and copy them into your Raspberry Pi Pico board.

1. copy "lib" folder into your Raspberry Pi Pico board.

2. open "Pico_W5500_Echo_Demo.py" OR get the code "Pico_W5500_DHCP_Echo" from below code section in this project.

Pico W5500 DHCP Demo github repo

in the lib, I modified some codes in WIZNET5K library from Adafruit.

In adafruit_wiznet5k.py - before DHCP, check link status first.

# in the def __init__ function

start_time = time.monotonic()
while True:
    if self.link_status or ((time.monotonic() - start_time) > 5) :
        break
    time.sleep(1)
    if self._debug:
        print("My Link is:", self.link_status)

In adafruit_wiznet5k_dhcp.py - before DHCP message sending, init _BUFF byte array.

def send_dhcp_message(self, state, time_elapsed):
    # before making send packet, should init _BUFF. if not, DHCP sometimes fails, wrong padding, garbage bytes, ...
    for i in range(len(_BUFF)):
        _BUFF[i] = 0

Latest code, you can download from

https://github.com/bjnhur/pico-W5500/tree/main/lib/adafruit_wiznet5k

https://github.com/bjnhur/Adafruit_CircuitPython_Wiznet5k (fork version)

3. copy all contents into "code.py" on your Pico board.

copy lib and edit code.py from Pico_W5500_DHCP_Echo demo code

4. save "code.py" and open REPL.

3. DHCP processing

my REPL console window log:

DHCP start

DHCP process is ok.

DHCP Done and listen socket

tcp server socket is also opened.

4. ECHO Demo

First I try to ping to the board. no problem.

ping command

Second, I tried to TCP connect to (as described on our python code) - I used "Hercules" freeware tool for socket test.

Destination IP - 192.168.0.20
Port - 50007
Send data - "12345"

1 / 2 • TCP Echo Demo result

5. WebClient Demo

You can find WebClient Demo easily from Adafruit WIZNET5K Ethernet library. Let's try this sample code as well. It's easy. Powerful CircuitPython!!

original example, visit https://github.com/adafruit/Adafruit_CircuitPython_Wiznet5k/blob/master/examples/wiznet5k_simpletest.py

I also prepared "Pico_W5500_WebClient_Demo.py" on my repo.

https://github.com/bjnhur/pico-W5500/blob/main/Pico_W5500_WebClient_Demo.py
or can copy code from "Pico_W5500_WebClient_Demo" in below code section

Just copy this code (or download, rename, copy) into "code.py" on your Raspberry Pi Pico board, then save. Done!

you can see the result log in your REPL console window as below.

Raspberry Pi Pico W5500 Ethernet WebClient Demo result

1. IP lookup adafruit.com result

2. Getting page from "http://wifitest.adafruit.com/testwifi/index.html"

3. Getting JSON data from "http://api.coindesk.com/v1/bpi/currentprice/USD.json"

*) Check again! This example, you need "adafruit_requests.mpy" file in lib folder.

adafruit_requests.mpy location

Resource

All code, you can find the below repo.

https://github.com/bjnhur/pico-W5500

Happy coding!

Good V!

Code

import board
import busio
import digitalio
import time
from adafruit_wiznet5k.adafruit_wiznet5k import WIZNET5K
import adafruit_wiznet5k.adafruit_wiznet5k_socket as socket

SPI1_SCK = board.GP10
SPI1_TX = board.GP11
SPI1_RX = board.GP12
SPI1_CSn = board.GP13
W5500_RSTn = board.GP15

print("Wiznet5k SimpleServer Test (DHCP)")

# Setup your network configuration below
# random MAC, later should change this value on your vendor ID
MY_MAC = (0x00, 0x01, 0x02, 0x03, 0x04, 0x05)
IP_ADDRESS = (192, 168, 0, 111)
SUBNET_MASK = (255, 255, 0, 0)
GATEWAY_ADDRESS = (192, 168, 0, 1)
DNS_SERVER = (8, 8, 8, 8)

led = digitalio.DigitalInOut(board.GP25)
led.direction = digitalio.Direction.OUTPUT

ethernetRst = digitalio.DigitalInOut(W5500_RSTn)
ethernetRst.direction = digitalio.Direction.OUTPUT

# For Adafruit Ethernet FeatherWing
cs = digitalio.DigitalInOut(SPI1_CSn)
# For Particle Ethernet FeatherWing
# cs = digitalio.DigitalInOut(board.D5)

spi_bus = busio.SPI(SPI1_SCK, MOSI=SPI1_TX, MISO=SPI1_RX)

# Reset W5500 first
ethernetRst.value = False
time.sleep(1)
ethernetRst.value = True

# # Initialize ethernet interface without DHCP
# eth = WIZNET5K(spi_bus, cs, is_dhcp=False, mac=MY_MAC, debug=True)
# # Set network configuration
# eth.ifconfig = (IP_ADDRESS, SUBNET_MASK, GATEWAY_ADDRESS, DNS_SERVER)

# Initialize ethernet interface with DHCP
eth = WIZNET5K(spi_bus, cs, is_dhcp=True, mac=MY_MAC, debug=True)

print("Chip Version:", eth.chip)
print("MAC Address:", [hex(i) for i in eth.mac_address])
print("My IP address is:", eth.pretty_ip(eth.ip_address))

# Initialize a socket for our server
socket.set_interface(eth)
server = socket.socket()  # Allocate socket for the server
server_ip = None  # IP address of server
server_port = 50007  # Port to listen on
server.bind((server_ip, server_port))  # Bind to IP and Port
server.listen()  # Begin listening for incoming clients

while True:
    led.value = not led.value
    time.sleep(1)
    conn, addr = server.accept()  # Wait for a connection from a client.
    print("socket connected")
    with conn:
        # data = conn.recv()
        # print(data)
        # conn.send(data)  # Echo message back to client
        while True:
            data = conn.recv()
            if data:
                print(data)
                conn.send(data)  # Echo message back to client
                break

print("Done!")

import board
import busio
import digitalio
import time
import adafruit_requests as requests
from adafruit_wiznet5k.adafruit_wiznet5k import WIZNET5K
import adafruit_wiznet5k.adafruit_wiznet5k_socket as socket

SPI1_SCK = board.GP10
SPI1_TX = board.GP11
SPI1_RX = board.GP12
SPI1_CSn = board.GP13
W5500_RSTn = board.GP15

print("Wiznet5k WebClient Test")

TEXT_URL = "http://wifitest.adafruit.com/testwifi/index.html"
JSON_URL = "http://api.coindesk.com/v1/bpi/currentprice/USD.json"

# Setup your network configuration below
# random MAC, later should change this value on your vendor ID
MY_MAC = (0x00, 0x01, 0x02, 0x03, 0x04, 0x05)
# IP_ADDRESS = (192, 168, 0, 111)
# SUBNET_MASK = (255, 255, 0, 0)
# GATEWAY_ADDRESS = (192, 168, 0, 1)
# DNS_SERVER = (8, 8, 8, 8)

led = digitalio.DigitalInOut(board.GP25)
led.direction = digitalio.Direction.OUTPUT

ethernetRst = digitalio.DigitalInOut(W5500_RSTn)
ethernetRst.direction = digitalio.Direction.OUTPUT

# For Adafruit Ethernet FeatherWing
cs = digitalio.DigitalInOut(SPI1_CSn)
# For Particle Ethernet FeatherWing
# cs = digitalio.DigitalInOut(board.D5)

spi_bus = busio.SPI(SPI1_SCK, MOSI=SPI1_TX, MISO=SPI1_RX)

# Reset W5500 first
ethernetRst.value = False
time.sleep(1)
ethernetRst.value = True

# # Initialize ethernet interface without DHCP
# eth = WIZNET5K(spi_bus, cs, is_dhcp=False, mac=MY_MAC, debug=True)
# # Set network configuration
# eth.ifconfig = (IP_ADDRESS, SUBNET_MASK, GATEWAY_ADDRESS, DNS_SERVER)

# Initialize ethernet interface with DHCP
eth = WIZNET5K(spi_bus, cs, is_dhcp=True, mac=MY_MAC, debug=False)

print("Chip Version:", eth.chip)
print("MAC Address:", [hex(i) for i in eth.mac_address])
print("My IP address is:", eth.pretty_ip(eth.ip_address))
print(
    "IP lookup adafruit.com: %s" % eth.pretty_ip(eth.get_host_by_name("adafruit.com"))
)

# Initialize a requests object with a socket and ethernet interface
requests.set_socket(socket, eth)

# eth._debug = True
print("Fetching text from", TEXT_URL)
r = requests.get(TEXT_URL)
print("-" * 40)
print(r.text)
print("-" * 40)
r.close()

print()
print("Fetching json from", JSON_URL)
r = requests.get(JSON_URL)
print("-" * 40)
print(r.json())
print("-" * 40)
r.close()


while True:
    led.value = not led.value
    time.sleep(1)

print("Done!")

Credits

Bongjun Hur

7 projects • 17 followers

How to add W5500 Ethernet to Raspberry Pi Pico (Python) - 2

Things used in this project

Hardware components

Story

1. Preview

2. DHCP Example

3. DHCP processing

4. ECHO Demo

5. WebClient Demo

Resource

Schematics

Pico_WIZ850io

Code

Pico_W5500_DHCP_Echo

Pico_W5500_WebClient_Demo

Credits

Bongjun Hur

Comments

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How to add W5500 Ethernet to Raspberry Pi Pico (Python) - 2

How to add W5500 Ethernet to Raspberry Pi Pico (Python) - 2

Things used in this project

Hardware components

Story

1. Preview

2. DHCP Example

3. DHCP processing

4. ECHO Demo

5. WebClient Demo

Resource

Schematics

Pico_WIZ850io

Code

Pico_W5500_DHCP_Echo

Pico_W5500_WebClient_Demo

Credits

Bongjun Hur

Comments

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