[作品提交] 【得捷电子Follow me第4期】基础任务二：主控板建立TCPIP或UDP服务器

zygalaxy 2024-2-24 21:30 楼主

基础任务二：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)

由于之前的任务，已经完成了基本的网络配置，本任务只需要在本地启动一个http服务即可。

根据示例中的代码修改即可成为一个完整的http服务器。通过网页控制灯的开关

以下是具体代码：

#include <SPI.h>
#include <Ethernet.h>

// Screen
#include "PDLS_EXT3_Basic_Global.h"

// SDK
// #include <Arduino.h>
#include "hV_HAL_Peripherals.h"

// Include application, user and local libraries
// #include <SPI.h>

// Configuration
#include "hV_Configuration.h"

Screen_EPD_EXT3 myScreen(eScreen_EPD_EXT3_370, boardRaspberryPiPico_RP2040);

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
    0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
IPAddress ip(192, 168, 0, 122);

// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);

String reqArgs;
// Utilities
///
/// [url=home.php?mod=space&uid=159083]@brief[/url] Wait with countdown
/// @param second duration, s
///
void wait(uint8_t second)
{
    for (uint8_t i = second; i > 0; i--)
    {
        Serial.print(formatString(" > %i  \r", i));
        delay(1000);
    }
    Serial.print("         \r");
}

void handlerHttp()

{
    myScreen.clear();
    if (reqArgs.indexOf("LED=on") > -1)
    {
        digitalWrite(25, HIGH);
        myScreen.gText(10, 10, "LED is on");
        myScreen.flush();
    }

    if (reqArgs.indexOf("LED=off") > -1)
    {
        digitalWrite(25, LOW);
        myScreen.gText(10, 10, "LED is off");
        myScreen.flush();
    }

    if (reqArgs.indexOf("LED=sw") > -1)
    {
        digitalWrite(25, !digitalRead(25));
        myScreen.gText(10, 10, formatString("LED is %s", digitalRead(25) ? "on" : "off"));
        myScreen.flush();
    }
}
void setup()

{
    // 配置LED
    pinMode(25, OUTPUT);
    digitalWrite(25, LOW);
    // Ethernet.init(17);
    // Open serial communications and wait for port to open:
    Serial.begin(9600);
    while (!Serial)
    {
        ; // wait for serial port to connect. Needed for native USB port only
    }
    Serial.println("Ethernet WebServer Example");

    // start the Ethernet connection and the server:
    Ethernet.begin(mac, ip);

    // Check for Ethernet hardware present
    if (Ethernet.hardwareStatus() == EthernetNoHardware)
    {
        Serial.println("Ethernet shield was not found.  Sorry, can't run without hardware. :(");
        while (true)
        {
            delay(1); // do nothing, no point running without Ethernet hardware
        }
    }
    if (Ethernet.linkStatus() == LinkOFF)
    {
        Serial.println("Ethernet cable is not connected.");
    }

    // start the server
    myScreen.begin();
    Serial.println(formatString("%s %ix%i", myScreen.WhoAmI().c_str(), myScreen.screenSizeX(), myScreen.screenSizeY()));
    myScreen.clear();
    myScreen.setOrientation(7);

    myScreen.selectFont(Font_Terminal12x16);
    myScreen.flush();
    server.begin();
    Serial.print("server is at ");
    Serial.println(Ethernet.localIP());
}

void loop()
{
    // listen for incoming clients
    EthernetClient client = server.available();
    if (client)
    {
        Serial.println("new client");
        // an HTTP request ends with a blank line
        bool currentLineIsBlank = true;
        while (client.connected())
        {
            if (client.available())
            {
                char c = client.read();
                Serial.write(c);
                reqArgs += c;
                // if you've gotten to the end of the line (received a newline
                // character) and the line is blank, the HTTP request has ended,
                // so you can send a reply
                if (c == '\n' && currentLineIsBlank)
                {
                    // send a standard HTTP response header
                    client.println("HTTP/1.1 200 OK");
                    client.println("Content-Type: text/html");
                    client.println("Connection: close"); // the connection will be closed after completion of the response
                    client.println("Refresh: 5");        // refresh the page automatically every 5 sec
                    client.println();
                    client.println("<!DOCTYPE HTML>");
                    client.println("<html>");

                    client.println("</html>");
                    handlerHttp();
                    break;
                }
                if (c == '\n')
                {
                    // you're starting a new line
                    currentLineIsBlank = true;
                }
                else if (c != '\r')
                {
                    // you've gotten a character on the current line
                    currentLineIsBlank = false;
                }
            }
        }
        // give the web browser time to receive the data
        delay(1);
        // close the connection:
        client.stop();
        Serial.println("client disconnected");
    }
}

上传代码到pico以后，观察串口等待服务器启动

然后在浏览器地址栏目输入http://192.168.0.122/?led=on 即可打开板载的灯

输入http://192.168.0.122/?led=off ，就会把打开的灯再次关闭，输入http://192.168.0.122/?led=sw 板载的led灯会切换亮灭