我在 VS Code 上获得了对 DHT22 库中函数的未定义引用我如何解决它？

如何解决我在 VS Code 上获得了对 DHT22 库中函数的未定义引用我如何解决它？

我有一个项目，涉及 ESP32 从 DHT22 收集温度和湿度数据。我正在尝试使用从 github 下载的外部 DHT22 库的功能。 当我尝试构建我的代码以在 ESP32 上测试它时，我得到了对函数的未定义引用，如此 image 所示。我该如何解决这个问题？

main.c:

#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "rom/ets_sys.h"
#include "nvs_flash.h"
#include "driver/gpio.h"
#include "sdkconfig.h"
#include "DHT22.h"

void DHT_task(void *pvParameter)
{
    setDHTgpio( 4 );
    printf( "Starting DHT Task\n\n");

    while(1) {
    
        printf("=== Reading DHT ===\n" );
        int ret = readDHT();
        
        errorHandler(ret);

        printf( "Hum %.1f\n",getHumidity() );
        printf( "Tmp %.1f\n",getTemperature() );
        
        vTaskDelay( 3000 / portTICK_RATE_MS );
    }
}

void app_main()
{
    nvs_flash_init();
    vTaskDelay( 1000 / portTICK_RATE_MS );
    xTaskCreate( &DHT_task,"DHT_task",2048,NULL,5,NULL );
}

tasks.json：

{
    "version": "2.0.0","tasks": [
        {
            "label": "Build - Build project","type": "shell","command": "${config:idf.pythonBinPath} ${config:idf.espIdfPath}/tools/idf.py build","windows": {
                "command": "${config:idf.pythonBinPathWin} ${config:idf.espIdfPathWin}\\tools\\idf.py build","options": {
                    "env": {
                        "PATH": "${env:PATH};${config:idf.customExtraPaths}"
                    }
                }
            },"options": {
                "env": {
                    "PATH": "${env:PATH}:${config:idf.customExtraPaths}"
                }
            },"problemMatcher": [
                {
                    "owner": "cpp","fileLocation": [
                        "relative","${workspaceFolder}"
                    ],"pattern": {
                        "regexp": "^\\.\\.(.*):(\\d+):(\\d+):\\s+(warning|error):\\s+(.*)$","file": 1,"line": 2,"column": 3,"severity": 4,"message": 5
                    }
                },{
                    "owner": "cpp","fileLocation": "absolute","pattern": {
                        "regexp": "^[^\\.](.*):(\\d+):(\\d+):\\s+(warning|error):\\s+(.*)$","message": 5
                    }
                }
            ],"group": {
                "kind": "build","isDefault": true
            }
        },{
            "label": "Set ESP-IDF Target","command": "${command:espIdf.setTarget}","problemMatcher": {
                "owner": "cpp","pattern": {
                    "regexp": "^(.*):(//d+):(//d+)://s+(warning|error)://s+(.*)$","message": 5
                }
            }
        },{
            "label": "Clean - Clean the project","command": "${config:idf.pythonBinPath} ${config:idf.espIdfPath}/tools/idf.py fullclean","windows": {
                "command": "${config:idf.pythonBinPathWin} ${config:idf.espIdfPathWin}\\tools\\idf.py fullclean","message": 5
                    }
                }
            ]
        },{
            "label": "Flash - Flash the device","command": "${config:idf.pythonBinPath} ${config:idf.espIdfPath}/tools/idf.py -p ${config:idf.port} -b ${config:idf.flashBaudRate} flash","windows": {
                "command": "${config:idf.pythonBinPathWin} ${config:idf.espIdfPathWin}\\tools\\idf.py flash -p ${config:idf.portWin} -b ${config:idf.flashBaudRate}",{
            "label": "Monitor: Start the monitor","command": "${config:idf.pythonBinPath} ${config:idf.espIdfPath}/tools/idf.py -p ${config:idf.port} monitor","windows": {
                "command": "${config:idf.pythonBinPathWin} ${config:idf.espIdfPathWin}\\tools\\idf.py -p ${config:idf.portWin} monitor","dependsOn": "Flash - Flash the device"
        },{
            "label": "OpenOCD: Start openOCD","presentation": {
                "echo": true,"reveal": "never","focus": false,"panel": "new"
            },"command": "openocd -s ${command:espIdf.getOpenOcdScriptValue} ${command:espIdf.getOpenOcdConfigs}","windows": {
                "command": "openocd.exe -s ${command:espIdf.getOpenOcdScriptValue} ${command:espIdf.getOpenOcdConfigs}","pattern": {
                    "regexp": "^(.*):(\\d+):(\\d+):\\s+(warning|error):\\s+(.*)$",{
            "label": "adapter","command": "${config:idf.pythonBinPath}","isBackground": true,"options": {
                "env": {
                    "PATH": "${env:PATH}:${config:idf.customExtraPaths}","PYTHONPATH": "${command:espIdf.getExtensionPath}/esp_debug_adapter/debug_adapter"
                }
            },"problemMatcher": {
                "background": {
                    "beginsPattern": "\bDEBUG_ADAPTER_STARTED\b","endsPattern": "DEBUG_ADAPTER_READY2CONNECT","activeOnStart": true
                },"pattern": {
                    "regexp": "(\\d+)-(\\d+)-(\\d+)\\s(\\d+):(\\d+):(\\d+),(\\d+)\\s-(.+)\\s(ERROR)","file": 8,"message": 9
                }
            },"args": [
                "${command:espIdf.getExtensionPath}/esp_debug_adapter/debug_adapter_main.py","-e","${workspaceFolder}/build/${command:espIdf.getProjectName}.elf","-s","${command:espIdf.getOpenOcdScriptValue}","-ip","localhost","-dn","${config:idf.adapterTargetName}","-om","connect_to_instance","-I","C:\\Users\\vorte\\ESP-IDF\\Projects\\hello_world\\main",],"windows": {
                "command": "${config:idf.pythonBinPathWin}","options": {
                    "env": {
                        "PATH": "${env:PATH};${config:idf.customExtraPaths}","PYTHONPATH": "${command:espIdf.getExtensionPath}/esp_debug_adapter/debug_adapter"
                    }
                }
            }
        }
    ]
}

c_cpp_properties.json：

{
    "configurations": [
        {
            "name": "ESP-IDF","compilerPath": "${default}","cStandard": "c11","cppStandard": "c++17","includePath": [
                "${config:idf.espIdfPath}/components/**","${config:idf.espIdfPathWin}/components/**","${workspaceFolder}/**","C:\\Users\\vorte\\ESP-IDF\\Projects\\hello_world\\main"
            ],"browse": {
                "path": [
                    "${config:idf.espIdfPath}/components","${config:idf.espIdfPathWin}/components","${workspaceFolder}","C:\\Users\\vorte\\ESP-IDF\\Projects\\hello_world\\main"
                ],"limitSymbolsToIncludedHeaders": false
            }
        }
    ],"version": 4
}

解决方法

将 DHT22 c 文件添加到主文件夹内的 CMAKElist 文件