一、简介

将ESP32——WEB服务程序测试项目移植到一个现有项目中，现有项目包括基于固定IP的WIFI连接、OTA升级、Websocket等功能。

二、移植

2.1 参考restful_server项目下分区表文件partitions_example.csv修改项目分区

因模块采用ESP32-WROVER-E(4MB)，故分区表内容修改如下（后发现问题，下面会提到）。

# Name,   Type, SubType,  Offset,   Size,  Flags
nvs,      data, nvs,      0x9000,  0x4000
otadata,  data, ota,      0xd000,  0x2000
phy_init, data, phy,      0xf000,  0x1000
ota_0,    app,  ota_0,    0x10000,  1M
ota_1,    app,  ota_1,    ,         1M
www,      data, spiffs,   ,         1M

并修改配置如下图项。

2.2 复制前端代码

将restful_server项目front目录及其下所有内容复制到现有项目根目录下。

2.3 复制rest_server.c文件到现有项目main目录下

并在main目录下CMakeLists.txt文件中添加 "rest_server.c"

idf_component_register(SRCS "ota.c" "wifi.c" "websocket.c" "rest_server.c" "main.c"
                    INCLUDE_DIRS "."
                    # Embed the server root certificate into the final binary
                    EMBED_TXTFILES ${project_dir}/server_certs/ca_cert.pem)

2.4 复制esp_rest_main.c文件中如下内容到现有项目main.c文件中

//此处略去了必要的头文件和变量定义

esp_err_t start_rest_server(const char *base_path);

#if CONFIG_EXAMPLE_WEB_DEPLOY_SF
esp_err_t init_fs(void)
{
    esp_vfs_spiffs_conf_t conf = {
        .base_path = CONFIG_EXAMPLE_WEB_MOUNT_POINT,
        .partition_label = NULL,
        .max_files = 5,
        .format_if_mount_failed = false
    };
    esp_err_t ret = esp_vfs_spiffs_register(&conf);

    if (ret != ESP_OK) {
        if (ret == ESP_FAIL) {
            ESP_LOGE(TAG, "Failed to mount or format filesystem");
        } else if (ret == ESP_ERR_NOT_FOUND) {
            ESP_LOGE(TAG, "Failed to find SPIFFS partition");
        } else {
            ESP_LOGE(TAG, "Failed to initialize SPIFFS (%s)", esp_err_to_name(ret));
        }
        return ESP_FAIL;
    }

    size_t total = 0, used = 0;
    ret = esp_spiffs_info(NULL, &total, &used);
    if (ret != ESP_OK) {
        ESP_LOGE(TAG, "Failed to get SPIFFS partition information (%s)", esp_err_to_name(ret));
    } else {
        ESP_LOGI(TAG, "Partition size: total: %d, used: %d", total, used);
    }
    return ESP_OK;
}
#endif

void app_main(void)
{
    esp_err_t err = nvs_flash_init();
    if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND) {
        ESP_ERROR_CHECK(nvs_flash_erase());
        err = nvs_flash_init();
    }
    ESP_ERROR_CHECK( err );

    IO_Init();  
    ip_set();
    wifi_init_sta();
    xTaskCreate(&advanced_ota_example_task, "advanced_ota_example_task", 1024 * 8, service_ip, 5, NULL);
    websocket_app_start(service_ip);
    ESP_ERROR_CHECK(init_fs());
    ESP_ERROR_CHECK(start_rest_server(CONFIG_EXAMPLE_WEB_MOUNT_POINT));
    // tasklist_show();   
    while (1)
    {
        LED_Run();
        Key_Read();
        vTaskDelay(100 / portTICK_PERIOD_MS);
    }    
}

2.5 复制main目录下Kconfig.projbuild中如下内容到现有项目对应文件中

注：项目Kconfig.projbuild中原来的内容因实际未用到，故删除了。

menu "Example Configuration"

    config EXAMPLE_MDNS_HOST_NAME
        string "mDNS Host Name"
        default "esp-home"
        help
            Specify the domain name used in the mDNS service.
            Note that webpage also take it as a part of URL where it will send GET/POST requests to.

    choice EXAMPLE_WEB_DEPLOY_MODE
        prompt "Website deploy mode"
        default EXAMPLE_WEB_DEPLOY_SEMIHOST
        help
            Select website deploy mode.
            You can deploy website to host, and ESP32 will retrieve them in a semihost way (JTAG is needed).
            You can deploy website to SD card or SPI flash, and ESP32 will retrieve them via SDIO/SPI interface.
            Detailed operation steps are listed in the example README file.
        config EXAMPLE_WEB_DEPLOY_SEMIHOST
            bool "Deploy website to host (JTAG is needed)"
            help
                Deploy website to host.
                It is recommended to choose this mode during developing.
        config EXAMPLE_WEB_DEPLOY_SD
            depends on IDF_TARGET_ESP32
            bool "Deploy website to SD card"
            help
                Deploy website to SD card.
                Choose this production mode if the size of website is too large (bigger than 2MB).
        config EXAMPLE_WEB_DEPLOY_SF
            bool "Deploy website to SPI Nor Flash"
            help
                Deploy website to SPI Nor Flash.
                Choose this production mode if the size of website is small (less than 2MB).
    endchoice

    if EXAMPLE_WEB_DEPLOY_SEMIHOST
        config EXAMPLE_HOST_PATH_TO_MOUNT
            string "Host path to mount (e.g. absolute path to web dist directory)"
            default "PATH-TO-WEB-DIST_DIR"
            help
                When using semihost in ESP32, you should specify the host path which will be mounted to VFS.
                Note that only absolute path is acceptable.
    endif

    config EXAMPLE_WEB_MOUNT_POINT
        string "Website mount point in VFS"
        default "/www"
        help
            Specify the mount point in VFS.

endmenu

保存后，重新打开配置出现如下选项，并做如下设置

2.6 复制main目录下CMakeLists.txt中如下内容到现有项目对应文件中

if(CONFIG_EXAMPLE_WEB_DEPLOY_SF)
    set(WEB_SRC_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../front/web-demo")
    if(EXISTS ${WEB_SRC_DIR}/dist)
        spiffs_create_partition_image(www ${WEB_SRC_DIR}/dist FLASH_IN_PROJECT)
    else()
        message(FATAL_ERROR "${WEB_SRC_DIR}/dist doesn't exit. Please run 'npm run build' in ${WEB_SRC_DIR}")
    endif()
endif()

2.7 复制根目录下Makefilet中如下内容到现有项目对应文件中

ifdef CONFIG_EXAMPLE_WEB_DEPLOY_SF
WEB_SRC_DIR = $(shell pwd)/front/web-demo
ifneq ($(wildcard $(WEB_SRC_DIR)/dist/.*),)
SPIFFS_IMAGE_FLASH_IN_PROJECT := 1
$(eval $(call spiffs_create_partition_image,www,$(WEB_SRC_DIR)/dist))
else
$(error $(WEB_SRC_DIR)/dist doesn't exist. Please run 'npm run build' in $(WEB_SRC_DIR))
endif
endif