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

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

or

• 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!