Connect Ethernet Cable
Make sure you have your Ethernet FeatherWing or Ethernet Shield firmly plugged into your hardware, and an Ethernet cable connected to your router or switch.
# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT
import board
import busio
import digitalio
import adafruit_requests as requests
from adafruit_wiznet5k.adafruit_wiznet5k import WIZNET5K
import adafruit_wiznet5k.adafruit_wiznet5k_socket as socket
print("Wiznet5k WebClient Test")
TEXT_URL = "http://wifitest.adafruit.com/testwifi/index.html"
JSON_URL = "http://api.coindesk.com/v1/bpi/currentprice/USD.json"
# For Adafruit Ethernet FeatherWing
cs = digitalio.DigitalInOut(board.D10)
# For Particle Ethernet FeatherWing
# cs = digitalio.DigitalInOut(board.D5)
spi_bus = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
# Initialize ethernet interface with DHCP
eth = WIZNET5K(spi_bus, cs)
# Initialize a requests object with a socket and ethernet interface
requests.set_socket(socket, eth)
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"))
)
# 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()
print("Done!")
Save the code.py file and open the REPL.
If you don't get an IP address, check you have a green link light, and that your Ethernet is going out to an internet connected router. You may also have to set up the MAC address to allow it access, check with your system admin if you're not sure.
In order, the example code:
Initializes the Ethernet chipset over SPI using the SPI port and the CS pin.
cs = digitalio.DigitalInOut(board.D10) spi_bus = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO) eth = WIZNET5K(spi_bus, cs)
Tells the requests library the socket, and interface we'll be using. The interface is set to an eth object. This is a little bit of a hack, but it lets us use requests like CPython does.
requests.set_socket(socket, eth)
Verifies the Ethernet hardware was found, checks the chip version and MAC address.
print("Chip Version:", eth.chip)
print("MAC Address:", [hex(i) for i in eth.mac_address])
Prints out the local IP and attempts to perform an IP address lookup for adafruit.com.
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")))
OK now we're getting to the really interesting part. With a SAMD51 or other large-RAM (well, over 32 KB) device, we can do a lot of neat tricks. Like, for example, we can implement an interface a lot like requests - which makes getting data really really easy
To read in all the text from a web URL, call requests.get -
print("Fetching text from", TEXT_URL)
r = requests.get(TEXT_URL)
print('-'*40)
print(r.text)
print('-'*40)
r.close()
Or, if the data is in structured JSON, you can get the json pre-parsed into a Python dictionary that can be easily queried or traversed. (Again, only for nRF52840, M4 and other high-RAM boards)
print()
print("Fetching json from", JSON_URL)
r = requests.get(JSON_URL)
print('-'*40)
print(r.json())
print('-'*40)
r.close()
Manual Network Configuration
The Wiznet5k library automatically takes care of DHCP and DNS configuration, so you can get your project online quickly. However, there are cases where a network administrator will provide you with an IP address or you may need to manually configure the interface.
This code performs the same Ethernet simpletest as the above section, but allows you to configure your network interface.
# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT
import board
import busio
import digitalio
import adafruit_requests as requests
from adafruit_wiznet5k.adafruit_wiznet5k import WIZNET5K
import adafruit_wiznet5k.adafruit_wiznet5k_socket as socket
TEXT_URL = "http://wifitest.adafruit.com/testwifi/index.html"
# Setup your network configuration below
IP_ADDRESS = (192, 168, 10, 1)
SUBNET_MASK = (255, 255, 0, 0)
GATEWAY_ADDRESS = (192, 168, 0, 1)
DNS_SERVER = (8, 8, 8, 8)
print("Wiznet5k WebClient Test (no DHCP)")
cs = digitalio.DigitalInOut(board.D10)
spi_bus = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
# Initialize ethernet interface without DHCP
eth = WIZNET5K(spi_bus, cs, is_dhcp=False)
# Set network configuration
eth.ifconfig = (IP_ADDRESS, SUBNET_MASK, GATEWAY_ADDRESS, DNS_SERVER)
# Initialize a requests object with a socket and ethernet interface
requests.set_socket(socket, eth)
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"))
)
# eth._debug = True
print("Fetching text from", TEXT_URL)
r = requests.get(TEXT_URL)
print("-" * 40)
print(r.text)
print("-" * 40)
r.close()
print()
You will need to manually set your network configuration:
-
Set
IP_ADDRESSto your desired IP address. -
Set
SUBNET_MASKto the router's subnet mask -
Set
GATEWAY_ADDRESSto the router's IP address. -
Set
DNS_SERVERto the DNS server you'd like to use. We're using 8.8.8.8 which is Google's Public DNS.
# Setup your network configuration below IP_ADDRESS = (192, 168, 10, 1) SUBNET_MASK = (255, 255, 0, 0) GATEWAY_ADDRESS = (192, 168, 0, 1) DNS_SERVER = (8, 8, 8, 8)
When the Ethernet interface is initialized, we'll disable the automatic DHCP process.
# Initialize ethernet interface without DHCP eth = WIZNET5K(spi_bus, cs, is_dhcp=False)
Then, we'll set up the network configuration by passing the ifconfig property a tuple containing the IP address, subnet mask, gateway address and DNS server.
# Set network configuration eth.ifconfig = (IP_ADDRESS, SUBNET_MASK, GATEWAY_ADDRESS, DNS_SERVER)
