【得捷电子Follow me第4期】交作业

leihaozhuce

【得捷电子Follow me第4期】交作业 [复制链接]

代码：

https://download.eeworld.com.cn/detail/leihaozhuce/631463

视频：

https://training.eeworld.com.cn/video/39558

按照官方要求使用W5500-EVB-Pico、 Adafruit Sharp Memory Display两种器件完成开发。软件选用python语言进行编程，circuit python的库很全，更新也很快，非常好用，大大降低了开发难度。

在树莓派平台上进行开发，体验还不错。

编译器用树莓派自带的Thonny，简单易用。

首先搭建开发环境，去官网下载最新固件，写入到w5500中，常规操作就不再重复写了。

第一步电灯，代码如下：

濠电姷鏁告慨鐑藉极閸涘﹥鍙忓ù鍏兼綑閸ㄥ倿鏌ｉ幘宕囧哺闁哄鐗楃换娑㈠箣閻愬娈ら梺娲诲幗閹瑰洭寮婚悢铏圭＜闁靛繒濮甸悘鍫ユ⒑閸濆嫬顏ラ柛搴ｆ暬瀵濡搁埡鍌氫簽闂佺ǹ鏈粙鎴︻敂閿燂拷

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import machine  
import time

# 初始化LED引脚为输出模式  
led = machine.Pin('LED', machine.Pin.OUT)  
  
while True:  
    # 点亮LED  
    led.on()  
    time.sleep(1)  # 等待1秒钟  
      
    # 熄灭LED  
    led.off()  
    time.sleep(1)  # 等待1秒钟

运行程序

效果见下图

驱动lcd显示屏，先安装好必要的库文件，去官网下载，比较慢，费了大劲才下载下来。

将adafruit_sharpmemorydisplay.mpy和adafruit_framebuf.mpy两个库文件拷贝到w5500的lib目录下。

连接lcd显示器，接线如下，还有3.3v和GND

	GP15	显示模块DI
	GP14	显示模块CLK
	GP13	显示模块CS

如图所示

代码如下

濠电姷鏁告慨鐑藉极閸涘﹥鍙忓ù鍏兼綑閸ㄥ倿鏌ｉ幘宕囧哺闁哄鐗楃换娑㈠箣閻愬娈ら梺娲诲幗閹瑰洭寮婚悢铏圭＜闁靛繒濮甸悘鍫ユ⒑閸濆嫬顏ラ柛搴ｆ暬瀵濡搁埡鍌氫簽闂佺ǹ鏈粙鎴︻敂閿燂拷

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import time
import board
import busio
import digitalio

import adafruit_sharpmemorydisplay

def led_flush():
    led.value = not led.value
    time.sleep(0.5)

def clear_disp():
    # Clear the display.  Always call show after changing pixels to make the display
    # update visible!
    display.fill(1)
    display.show()

def disp_helloworld():
    print("hello EEWORLD")
    display.fill(1)
    display.text(" hello EEWORLD!", 30, 50, 0)
    display.show()

if __name__ == '__main__':
    led = digitalio.DigitalInOut(board.GP25)
    led.direction = digitalio.Direction.OUTPUT

    # Initialize SPI bus and control pins
    spi = busio.SPI(board.GP14, MOSI=board.GP15)
    scs = digitalio.DigitalInOut(board.GP13)  # inverted chip select

    # pass in the display size, width and height, as well
    # display = adafruit_sharpmemorydisplay.SharpMemoryDisplay(spi, scs, 96, 96)
    display = adafruit_sharpmemorydisplay.SharpMemoryDisplay(spi, scs, 144, 168)

    clear_disp()
    disp_helloworld()
    while True:
        led_flush()

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。

通过网线将w5500接入到交换机上。

安装树莓派版的wireshark软件

安装好后用

$ sudo wireshark &

命令取得root权限，才能看到端口。

因为树莓派用的无线链接，这里选择 wlan0 ，就可以开始抓包了。

配置代码如下

濠电姷鏁告慨鐑藉极閸涘﹥鍙忓ù鍏兼綑閸ㄥ倿鏌ｉ幘宕囧哺闁哄鐗楃换娑㈠箣閻愬娈ら梺娲诲幗閹瑰洭寮婚悢铏圭＜闁靛繒濮甸悘鍫ユ⒑閸濆嫬顏ラ柛搴ｆ暬瀵濡搁埡鍌氫簽闂佺ǹ鏈粙鎴︻敂閿燂拷

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

##SPI0
SPI0_SCK = board.GP18
SPI0_TX = board.GP19
SPI0_RX = board.GP16
SPI0_CSn = board.GP17

##reset
W5x00_RSTn = board.GP20

print("Wiznet5k Ping Test (no 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, 1, 100)
SUBNET_MASK = (255, 255, 255, 0)
GATEWAY_ADDRESS = (192, 168, 1, 1)
DNS_SERVER = (8, 8, 8, 8)

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

ethernetRst = digitalio.DigitalInOut(W5x00_RSTn)
ethernetRst.direction = digitalio.Direction.OUTPUT

# For Adafruit Ethernet FeatherWing
cs = digitalio.DigitalInOut(SPI0_CSn)
# For Particle Ethernet FeatherWing
# cs = digitalio.DigitalInOut(board.D5)
spi_bus = busio.SPI(SPI0_SCK, MOSI=SPI0_TX, MISO=SPI0_RX)

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

# Initialize ethernet interface with DHCP
# eth = WIZNET5K(spi_bus, cs)
# Initialize ethernet interface without DHCP
eth = WIZNET5K(spi_bus, cs, is_dhcp=False, mac=MY_MAC)

# Set network configuration
eth.ifconfig = (IP_ADDRESS, SUBNET_MASK, GATEWAY_ADDRESS, DNS_SERVER)

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))

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

print("Done!")

运行结果如下图

下显示开发板地址为192.168.1.100,下面进行ping测试，

能ping到开发板。抓包结果如下图。

抓包结果

主控板建立TCPIP或UDP服务器，局域网PC使用TCPIP或UDP客户端进行连接并发送数据，主控板接收到数据后，送液晶屏显示(没有则通过串口打印显示)；通过抓包软件抓取交互报文，展示并分析。(TCP和UDP二选一，或者全都操作)

采用基础任务一的软件为基础，完成TCP和UDP服务器，服务器IP = 172.17.100.101，端口号Port = 40001 。

利用adafruit_wiznet5k_socket库，创建一个TCP服务器。函数输入参数为服务器端口。

接收到的信息会显示到LCD显示器上，显示分为三个区域：

区域1：以太网参数区，区域2：TCP连接信息显示区，区域3：接收到的信息显示区，显示函数的输入参数为待显示的字符串和显示的位置。

代码如下：

濠电姷鏁告慨鐑藉极閸涘﹥鍙忓ù鍏兼綑閸ㄥ倿鏌ｉ幘宕囧哺闁哄鐗楃换娑㈠箣閻愬娈ら梺娲诲幗閹瑰洭寮婚悢铏圭＜闁靛繒濮甸悘鍫ユ⒑閸濆嫬顏ラ柛搴ｆ暬瀵濡搁埡鍌氫簽闂佺ǹ鏈粙鎴︻敂閿燂拷

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import time
import board
import busio
import digitalio
import array
import struct

import adafruit_sharpmemorydisplay
from adafruit_wiznet5k.adafruit_wiznet5k import WIZNET5K
import adafruit_wiznet5k.adafruit_wiznet5k_socket as socket

IP_ADDRESS = (172, 17, 100, 101)
SUBNET_MASK = (255, 255, 0, 0)
GATEWAY_ADDRESS = (172, 17, 64, 1)
DNS_SERVER = (218, 203, 59, 116)


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

    # Initialize SPI bus and control pins
    spi = busio.SPI(board.GP14, MOSI=board.GP15)
    scs = digitalio.DigitalInOut(board.GP13)  # inverted chip select

    # pass in the display size, width and height, as well
    # display = adafruit_sharpmemorydisplay.SharpMemoryDisplay(spi, scs, 96, 96)
    display = adafruit_sharpmemorydisplay.SharpMemoryDisplay(spi, scs, 144, 168)
    
    return led,display

def led_flush():
    led.value = not led.value
    time.sleep(0.5)

def clear_disp():
    # Clear the display.  Always call show after changing pixels to make the display
    # update visible!
    display.fill(1)
    display.show()

def disp_helloworld():
    print("hello world")
    display.fill(1)
    display.text(" hello world!", 30, 50, 0)
    display.show()

def init_w5500(ip, subnet, gateway, dns):
    ##SPI0
    SPI0_SCK = board.GP18
    SPI0_TX = board.GP19
    SPI0_RX = board.GP16
    SPI0_CSn = board.GP17    
    ##reset
    W5x00_RSTn = board.GP20
    
    print("Wiznet5k Ping Test (no DHCP)")
    
    ethernetRst = digitalio.DigitalInOut(W5x00_RSTn)
    ethernetRst.direction = digitalio.Direction.OUTPUT
    
    # For Adafruit Ethernet FeatherWing
    cs = digitalio.DigitalInOut(SPI0_CSn)
    # For Particle Ethernet FeatherWing
    # cs = digitalio.DigitalInOut(board.D5)
    spi_bus = busio.SPI(SPI0_SCK, MOSI=SPI0_TX, MISO=SPI0_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)

    # Set network configuration
    eth.ifconfig = (ip, subnet, gateway, dns)

    print("Chip Version:", eth.chip)
    print("My IP address is:", eth.pretty_ip(eth.ip_address))

    return eth

def disp_w5500():
    clear_disp()
    display.fill(1)
    cst = "chip version:" + eth.chip
    display.text(cst, 0, 0, 0)
    cst = "ip:" + eth.pretty_ip(eth.ip_address)
    display.text(cst, 0, 10, 0)
    cst = "mac:" + eth.pretty_mac(eth.mac_address)
    display.text(cst, 0, 20, 0)
    display.show()

def disp_str(s, addr):
    display.fill_rect(0,addr,144,10,1)
    display.text(s, 0, addr, 0)
    display.show()
    

def inCksum(packet):
    if len(packet) & 1:
        packet = packet + '\0'
    words = array.array('h', packet)
    sum = 0
    for word in words:
        sum += (word & 0xffff)
    sum = (sum>>16) + (sum & 0xffff)
    sum = sum + (sum >> 16)
    return (~sum) & 0xffff

def create_tcpserver(port):
    # Initialize a socket for our server
    socket.set_interface(eth)
    sc = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  # Allocate socket for the server
    sc_ip = None  # IP address of server
    sc_port = port  # Port to listen on
    sc.bind((sc_ip, sc_port))  # Bind to IP and Port
    sc.listen()  # Begin listening for incoming clients
    
    return sc

def create_udpserver(port):
    # Initialize a socket for our server
    socket.set_interface(eth)
    sc = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)  # Allocate socket for the server
#    sc_ip = None  # IP address of server
    sc_port = port  # Port to listen on
    sc.bind((eth.pretty_ip(eth.ip_address), sc_port))  # Bind to IP and Port
    
    return sc


if __name__ == '__main__':
    # 初始化led和显示模块
    led,display = init()
    clear_disp()
    #静态初始化w5500
    eth = init_w5500(IP_ADDRESS, SUBNET_MASK, GATEWAY_ADDRESS, DNS_SERVER)
    disp_w5500()
    
    # 创建一个tcp服务器
#    server = create_tcpserver(40001)
    # 创建一个udp服务器
    server = create_udpserver(40001)
    
#    conn, addr = server.accept()  # Wait for a connection from a client.
    print("socket connected")
#    print(addr)
    disp_str("UDP Server TEST", 30)
    disp_str("socket connected", 40)
#    disp_str('cli:'+addr[0]+','+str(addr[1]), 50)
    disp_str('receive:', 60)
    linenum = 70
    while True:
        led_flush()
        
        with server:
            while True:
#                data = conn.recv(20)
                data,addr = server.recvfrom(20)
                disp_str('cli:'+addr[0]+','+str(addr[1]), 50)
                if data:
                    print(data)
                    disp_str(data.decode('utf-8'),linenum)
                    linenum += 10
                    if linenum > 150:
                        linenum = 70
#                    conn.send(data)  # Echo message back to client

运行结果如下图：

服务器建立起来。

但目前还未找到树莓派上用的TCP和UDP首发软件，具体测试还未进行。

搭建一个sntp的客户端从ntp授时服务器获取时间。

代码如下

濠电姷鏁告慨鐑藉极閸涘﹥鍙忓ù鍏兼綑閸ㄥ倿鏌ｉ幘宕囧哺闁哄鐗楃换娑㈠箣閻愬娈ら梺娲诲幗閹瑰洭寮婚悢铏圭＜闁靛繒濮甸悘鍫ユ⒑閸濆嫬顏ラ柛搴ｆ暬瀵濡搁埡鍌氫簽闂佺ǹ鏈粙鎴︻敂閿燂拷

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import ntptime
import time
for i in range(10):
    try:
        ntptime.settime()
        t = time.localtime(time.time() + 8*3600)
        print("ntp time(BeiJing): %s-%s-%s %s:%s:%s" % (t[0],t[1],t[2],t[3],t[4],t[5]))
        break
    except:
        print("Can not get time!")

    time.sleep_ms(1000)

运行结果如下图

心得体会

python的开发库维护的挺好，器件种类很全，大大加快的开发进度，是开发的选择，网络编程要学习的还有很多，难度还是挺高的。

最后感谢得捷，感谢EEWORLD提。

lugl4313820

python的开发库维护的挺好，器件种类很全，大大加快的开发进度，是开发的选择，网络编程要学习的还有很多，难度还是挺高的。

看来上手任务非常简单，要感谢论坛举办这么好的活动。

【得捷电子Follow me第4期】交作业 [复制链接]

利用adafruit_wiznet5k_socket库，创建一个TCP服务器。函数输入参数为服务器端口。

心得体会

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