[Digi-Key Follow me Issue 4] Basic Task 1: Complete the initialization of the main control board W5500 (static IP configuration)

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[Digi-Key Follow me Issue 4] Basic Task 1: Complete the initialization of the main control board W5500 (static IP configuration) [Copy link]

 

2.1 Mission Statement

Complete the initialization of the main control board W5500 (static IP configuration), and be able to use the LAN computer to ping, and W5500 can ping Internet sites; use packet capture software (Wireshark, Sniffer, etc.) to capture the local PC's ping message, display and analyze it.

2.2 Code Implementation

import time
import board
import busio
import asyncio
import digitalio
from adafruit_wiznet5k.adafruit_wiznet5k import WIZNET5K

# 网口 SPI 引脚定义
SPI0_SCK = board.GP18
SPI0_TX = board.GP19
SPI0_RX = board.GP16
SPI0_CSn = board.GP17
# RESET 引脚定义
W5x00_RSTn = board.GP20

print("Wiznet5k Ping Test (no DHCP)")

# 静态IP设置
# MAC地址
MAC = (0x00, 0x01, 0x02, 0x03, 0x04, 0x05)
# IP地址
IP_ADDRESS = (192, 168, 1, 101)
# 子网掩码
SUBNET_MASK = (255, 255, 255, 0)
# 网关
GATEWAY_ADDRESS = (192, 168, 1, 1)
# DNS
DNS_SERVER = (8, 8, 8, 8)
# 网络接口对象
eth = None 

''' 网络初始化 '''
async def init():
    global eth
    # REST引脚初始化
    rst_pin = digitalio.DigitalInOut(W5x00_RSTn)
    rst_pin.direction = digitalio.Direction.OUTPUT

    # SPI CS引脚初始化
    cs = digitalio.DigitalInOut(SPI0_CSn)
    # SPI初始化
    spi_bus = busio.SPI(SPI0_SCK, MOSI=SPI0_TX, MISO=SPI0_RX)

    # 官网示例先重置 W5500
    rst_pin.value = False
    time.sleep(1)
    rst_pin.value = True

    # 网口初始化
    eth = WIZNET5K(spi_bus, cs, is_dhcp=False, mac=MAC)

    # 配置网络
    eth.ifconfig = (IP_ADDRESS, SUBNET_MASK, GATEWAY_ADDRESS, DNS_SERVER)

    print("芯片版本:", eth.chip)
    print("MAC地址:", [hex(i) for i in eth.mac_address])
    print("IP地址:", eth.pretty_ip(eth.ip_address))
    print("请求电子工程世界IP地址: %s" % eth.pretty_ip(eth.get_host_by_name("www.eeworld.com.cn")))
    while True:
        await asyncio.sleep_ms(1)

2.3 Effect Display

From the screenshot of Wireshark , when the computer PINGs the IP of the development board, there are request and response packets, as shown in the figure above. Please see the attached file for the packet capture file. From the console in the screenshot, we can see that when requesting the IP address from the Electronic Engineering World website, we get a response and print out the real IP address of the Electronic Engineering World website, which is consistent with the IP address obtained by the computer terminal PINGing the Electronic Engineering World .

2.4 Summary

After the CircuitPython development environment of W5500-EVB-Pico is installed, load the w5500 driver library, and you can easily achieve network access, which is very convenient and friendly. However, the library currently does not support SocketPool very well, which makes it difficult to use in some occasions.

2.5 Video Demonstration

2.6 Capture file

ping-test.pcapng (1.87 MB, downloads: 0)

2024-2-22 12:19 上传

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