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c++ - ESP32 上网络服务器循环的看门狗定时器错误

问题描述

我正在将 ESP32 CAM 模块用于线跟随机器人。而且，我正在尝试创建一个带有 3 个提交按钮的网络服务器。但是现在，我只是观察串口上的输入并且只使用一个提交栏。这些按钮指定电机的 PWM 值和一些常数。这是我的代码：

#include "Arduino.h"
#include "WiFi.h"
#include "AsyncTCP.h"
#include "ESPAsyncWebServer.h"


AsyncWebServer server(80);

// Internet ID and Password
const char* ssid = "TURKSAT-KABLONET-BC75-2.4G";
const char* password = "d942d3db";

const char* PARAM_INPUT_1 = "input1";
const char* PARAM_INPUT_2 = "input2";
const char* PARAM_INPUT_3 = "input3";

// HTML web page to handle 3 input fields (input1, input2, input3)
const char index_html[] PROGMEM = R"rawliteral( // Webserver design part
<!DOCTYPE HTML><html><head>
  <title>ESP Input Form</title>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  </head><body>
  <form action="/get">
    input1: <input type="text" name="input1">
    <input type="submit" value="Submit"> // Submit bar 1
  </form><br>
  <form action="/get">
    input2: <input type="text" name="input2">
    <input type="submit" value="Submit"> // Submit bar 2
  </form><br>
  <form action="/get">
    input3: <input type="text" name="input3">
    <input type="submit" value="Submit"> // Submit bar 3
  </form>
</body></html>)rawliteral";

void notFound(AsyncWebServerRequest *request) {
  request->send(404, "text/plain", "Not found");
}
String inputMessage;
void Setup_to_Loop(String inputMessage); // Prototype of function

void Setup_to_Loop(String inputMessage){ // Function to observe the variable
  while(1){
    Serial.print(inputMessage); // Observe submit bar on serial port of Arduino
    delay(200);
  }
}

void setup() {
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  if (WiFi.waitForConnectResult() != WL_CONNECTED) {
    Serial.println("WiFi Failed!");
    return;
  }
  Serial.println();
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());

  // Send web page with input fields to client
  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/html", index_html);
  });
// Send a GET request to <ESP_IP>/get?input1=<inputMessage>
  server.on("/get", HTTP_GET, [] (AsyncWebServerRequest *request) {
    String inputMessage;
    String inputParam;
    // GET input1 value on <ESP_IP>/get?input1=<inputMessage>
    if (request->hasParam(PARAM_INPUT_1)) { // Check for which bar is filled ( bar 1 )
      inputMessage = request->getParam(PARAM_INPUT_1)->value();
      inputParam = PARAM_INPUT_1;
    }
    // GET input2 value on <ESP_IP>/get?input2=<inputMessage>
    else if (request->hasParam(PARAM_INPUT_2)) { // Check for which bar is filled ( bar 2 )
      inputMessage = request->getParam(PARAM_INPUT_2)->value();
      inputParam = PARAM_INPUT_2;
    }
    // GET input3 value on <ESP_IP>/get?input3=<inputMessage>
    else if (request->hasParam(PARAM_INPUT_3)) { // Check for which bar is filled ( bar 3 )
      inputMessage = request->getParam(PARAM_INPUT_3)->value();
      inputParam = PARAM_INPUT_3;
    }
    else {
      inputMessage = "No message sent";
      inputParam = "none";
    }
    Serial.println(inputMessage);
    request->send(200, "text/html", "HTTP GET request sent to your ESP on input field ("
                                     + inputParam + ") with value: " + inputMessage +
                                     "<br><a href=\"/\">Return to Home Page</a>");  // Send the values that were written on submit bars
    Setup_to_Loop(inputMessage);  // Call of function
  });
  server.onNotFound(notFound);
  server.begin();
}
void loop() {
}

收到的错误是：

(20281) task_wdt: Task watchdog got triggered. The following tasks did not reset the watchdog in time:
E (20281) task_wdt:  - async_tcp (CPU 0/1)
E (20281) task_wdt: Tasks currently running:
E (20281) task_wdt: CPU 0: IDLE0
E (20281) task_wdt: CPU 1: loopTask
E (20281) task_wdt: Aborting.
abort() was called at PC 0x400e5def on core 0

Backtrace: 0x4008efe0:0x3ffbe160 0x4008f211:0x3ffbe180 0x400e5def:0x3ffbe1a0 0x40081a15:0x3ffbe1c0 0x40147e4f:0x3ffbc170 0x400e1c53:0x3ffbc190 0x4008ce7d:0x3ffbc1b0 0x4008af7d:0x3ffbc1d0

Rebooting...

标签： c++webserveresp32watchdog

解决方案

您的函数Setup_to_Loop()调用delay(). 它是从"/get"请求的处理程序中调用的。

该ESPAsyncWebServer文档明确指出您不得这样做：

You can not use yield or delay or any function that uses them inside the callbacks

我不太确定你想用这个函数做什么以及为什么它使用无限循环，但你需要重写它。它应该及时返回而不是调用delay()。

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