esp-idf/examples/protocols/http_server/file_serving/main/main.c

/* HTTP File Server Example

   This example code is in the Public Domain (or CC0 licensed, at your option.)

   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
*/

#include <sys/param.h>

#include "esp_wifi.h"
#include "esp_event_loop.h"
#include "esp_log.h"
#include "esp_system.h"
#include "esp_spiffs.h"
#include "nvs_flash.h"

/* This example demonstrates how to create file server
 * using esp_http_server. This file has only startup code.
 * Look in file_server.c for the implementation */

/* The example uses simple WiFi configuration that you can set via
 * 'make menuconfig'.
 * If you'd rather not, just change the below entries to strings
 * with the config you want -
 * ie. #define EXAMPLE_WIFI_SSID "mywifissid"
*/
#define EXAMPLE_WIFI_SSID CONFIG_WIFI_SSID
#define EXAMPLE_WIFI_PASS CONFIG_WIFI_PASSWORD

static const char *TAG="example";

/* Wi-Fi event handler */
static esp_err_t event_handler(void *ctx, system_event_t *event)
{
    switch(event->event_id) {
    case SYSTEM_EVENT_STA_START:
        ESP_LOGI(TAG, "SYSTEM_EVENT_STA_START");
        ESP_ERROR_CHECK(esp_wifi_connect());
        break;
    case SYSTEM_EVENT_STA_GOT_IP:
        ESP_LOGI(TAG, "SYSTEM_EVENT_STA_GOT_IP");
        ESP_LOGI(TAG, "Got IP: '%s'",
                ip4addr_ntoa(&event->event_info.got_ip.ip_info.ip));
        break;
    case SYSTEM_EVENT_STA_DISCONNECTED:
        ESP_LOGI(TAG, "SYSTEM_EVENT_STA_DISCONNECTED");
        ESP_ERROR_CHECK(esp_wifi_connect());
        break;
    default:
        break;
    }
    return ESP_OK;
}

/* Function to initialize Wi-Fi at station */
static void initialise_wifi(void)
{
    ESP_ERROR_CHECK(nvs_flash_init());
    tcpip_adapter_init();
    ESP_ERROR_CHECK(esp_event_loop_init(event_handler, NULL));
    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
    ESP_ERROR_CHECK(esp_wifi_set_storage(WIFI_STORAGE_RAM));
    wifi_config_t wifi_config = {
        .sta = {
            .ssid = EXAMPLE_WIFI_SSID,
            .password = EXAMPLE_WIFI_PASS,
        },
    };
    ESP_LOGI(TAG, "Setting WiFi configuration SSID %s...", wifi_config.sta.ssid);
    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
    ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config));
    ESP_ERROR_CHECK(esp_wifi_start());
}

/* Function to initialize SPIFFS */
static esp_err_t init_spiffs(void)
{
    ESP_LOGI(TAG, "Initializing SPIFFS");

    esp_vfs_spiffs_conf_t conf = {
      .base_path = "/spiffs",
      .partition_label = NULL,
      .max_files = 5,   // This decides the maximum number of files that can be created on the storage
      .format_if_mount_failed = true
    };

    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));
        return ESP_FAIL;
    }

    ESP_LOGI(TAG, "Partition size: total: %d, used: %d", total, used);
    return ESP_OK;
}

/* Declare the function which starts the file server.
 * Implementation of this function is to be found in
 * file_server.c */
esp_err_t start_file_server(const char *base_path);

void app_main()
{
    initialise_wifi();

    /* Initialize file storage */
    ESP_ERROR_CHECK(init_spiffs());

    /* Start the file server */
    ESP_ERROR_CHECK(start_file_server("/spiffs"));
}