[经验分享] 【得捷电子Follow me第4期】基础任务一

任务要求：完成主控板W5500初始化(静态IP配置)，并能使用局域网电脑ping通，同时W5500可以ping通互联网站点；通过抓包软件(Wireshark、Sniffer等)抓取本地PC的ping报文，展示并分析。

通过修改官方代码可以实现上诉要求   官方代码链接W5100S_W5500+RP2040 Micro Python Examples: 使用W5100S或W5500芯片让树莓派RP2040接入到以太网中的应用示例。 - Gitee.com

静态IP配置，代码如下

def w5x00_init():
    #spi init
    spi=SPI(0,2_000_000, mosi=Pin(19),miso=Pin(16),sck=Pin(18))
    nic = network.WIZNET5K(spi,Pin(17),Pin(20)) #spi,cs,reset pin
    nic.active(True)#network active
    nic.ifconfig(('192.168.1.20','255.255.255.0','192.168.1.1','8.8.8.8'))#Set static network address information
    while not nic.isconnected():
        time.sleep(1)
        print(nic.regs())#Print register information
        
    #Print network address information
    print("IP Address:",nic.ifconfig()[0])
    print("Subnet Mask:",nic.ifconfig()[1])
    print("Gateway:",nic.ifconfig()[2])
    print("DNS:",nic.ifconfig()[3])
    return nic

nic = w5x00_init() #w5500初始化 

设置板子的静态IP为192.168.1.20，在电脑上通过命令窗口可以ping通板子，证明静态IP设置成功，效果如下图所示

完成W5500可以ping通互联网站点需要设置dns

设置dns代码如下

def dns_query(domain):
    ip = usocket.getaddrinfo(domain, 80,0, usocket.SOCK_STREAM)
    return ip[0][4][0]

效果如下

 板子ping百度

通过抓包软件Wireshark抓取本地PC的ping报文

在筛选框内输入板子IP地址

总体代码如下所示

#import library
from machine import Pin,SPI,PWM
import framebuf
import usocket 
import network
import time

#LED define
led = Pin(25, Pin.OUT)

BL = 13
DC = 8
RST = 12
MOSI = 11
SCK = 10
CS = 9
"""
W5x00 chip initialization.
 
param: None
returns: None

"""
def w5x00_init():
    #spi init
    spi=SPI(0,2_000_000, mosi=Pin(19),miso=Pin(16),sck=Pin(18))
    nic = network.WIZNET5K(spi,Pin(17),Pin(20)) #spi,cs,reset pin
    nic.active(True)#network active
    nic.ifconfig(('192.168.1.20','255.255.255.0','192.168.1.1','8.8.8.8'))#Set static network address information
    while not nic.isconnected():
        time.sleep(1)
        print(nic.regs())#Print register information
        
    #Print network address information
    print("IP Address:",nic.ifconfig()[0])
    print("Subnet Mask:",nic.ifconfig()[1])
    print("Gateway:",nic.ifconfig()[2])
    print("DNS:",nic.ifconfig()[3])
    return nic

def dns_query(domain):
    ip = usocket.getaddrinfo(domain, 80,0, usocket.SOCK_STREAM)
    return ip[0][4][0]

class LCD_1inch14(framebuf.FrameBuffer):
    def __init__(self):
        self.width = 240
        self.height = 135
        
        self.cs = Pin(CS,Pin.OUT)
        self.rst = Pin(RST,Pin.OUT)
        
        self.cs(1)
        self.spi = SPI(1)
        self.spi = SPI(1,1000_000)
        self.spi = SPI(1,10000_000,polarity=0, phase=0,sck=Pin(SCK),mosi=Pin(MOSI),miso=None)
        self.dc = Pin(DC,Pin.OUT)
        self.dc(1)
        self.buffer = bytearray(self.height * self.width * 2)
        super().__init__(self.buffer, self.width, self.height, framebuf.RGB565)
        self.init_display()
        
        self.red   =   0x07E0
        self.green =   0x001f
        self.blue  =   0xf800
        self.white =   0xffff
        
    def write_cmd(self, cmd):
        self.cs(1)
        self.dc(0)
        self.cs(0)
        self.spi.write(bytearray([cmd]))
        self.cs(1)

    def write_data(self, buf):
        self.cs(1)
        self.dc(1)
        self.cs(0)
        self.spi.write(bytearray([buf]))
        self.cs(1)

    def init_display(self):
        """Initialize dispaly"""  
        self.rst(1)
        self.rst(0)
        self.rst(1)
        
        self.write_cmd(0x36)
        self.write_data(0x70)

        self.write_cmd(0x3A) 
        self.write_data(0x05)

        self.write_cmd(0xB2)
        self.write_data(0x0C)
        self.write_data(0x0C)
        self.write_data(0x00)
        self.write_data(0x33)
        self.write_data(0x33)

        self.write_cmd(0xB7)
        self.write_data(0x35) 

        self.write_cmd(0xBB)
        self.write_data(0x19)

        self.write_cmd(0xC0)
        self.write_data(0x2C)

        self.write_cmd(0xC2)
        self.write_data(0x01)

        self.write_cmd(0xC3)
        self.write_data(0x12)   

        self.write_cmd(0xC4)
        self.write_data(0x20)

        self.write_cmd(0xC6)
        self.write_data(0x0F) 

        self.write_cmd(0xD0)
        self.write_data(0xA4)
        self.write_data(0xA1)

        self.write_cmd(0xE0)
        self.write_data(0xD0)
        self.write_data(0x04)
        self.write_data(0x0D)
        self.write_data(0x11)
        self.write_data(0x13)
        self.write_data(0x2B)
        self.write_data(0x3F)
        self.write_data(0x54)
        self.write_data(0x4C)
        self.write_data(0x18)
        self.write_data(0x0D)
        self.write_data(0x0B)
        self.write_data(0x1F)
        self.write_data(0x23)

        self.write_cmd(0xE1)
        self.write_data(0xD0)
        self.write_data(0x04)
        self.write_data(0x0C)
        self.write_data(0x11)
        self.write_data(0x13)
        self.write_data(0x2C)
        self.write_data(0x3F)
        self.write_data(0x44)
        self.write_data(0x51)
        self.write_data(0x2F)
        self.write_data(0x1F)
        self.write_data(0x1F)
        self.write_data(0x20)
        self.write_data(0x23)
        
        self.write_cmd(0x21)

        self.write_cmd(0x11)

        self.write_cmd(0x29)

    def show(self):
        self.write_cmd(0x2A)
        self.write_data(0x00)
        self.write_data(0x28)
        self.write_data(0x01)
        self.write_data(0x17)
        
        self.write_cmd(0x2B)
        self.write_data(0x00)
        self.write_data(0x35)
        self.write_data(0x00)
        self.write_data(0xBB)
        
        self.write_cmd(0x2C)
        
        self.cs(1)
        self.dc(1)
        self.cs(0)
        self.spi.write(self.buffer)
        self.cs(1)
def main():
    pwm = PWM(Pin(BL))
    pwm.freq(1000)
    pwm.duty_u16(32768)#max 65535

    LCD = LCD_1inch14()
    nic = w5x00_init()
    #color BRG
    ip = dns_query("www.baidu.com")
    print("IP address is %s"%(ip))
    LCD.fill(LCD.white)

    LCD.show()

    LCD.text("Follow me NO.4",20,20,LCD.red)
    LCD.text("www.baidu.com:",20,40,LCD.green)
    LCD.text("IP address is %s"%(ip),20,60,LCD.red)
    LCD.show()
   
    time.sleep(1)
    LCD.fill(0xFFFF)    

    while True:
        led.value(1)
        time.sleep(1)
        led.value(0)
        time.sleep(1)
        print("try ping",nic.ifconfig()[0])

if __name__ == "__main__":
    main()