mirror of
https://github.com/espressif/esp-idf.git
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129 lines
4.5 KiB
C
129 lines
4.5 KiB
C
/* Scan Example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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/*
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This example shows how to use the All Channel Scan or Fast Scan to connect
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to a Wi-Fi network.
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In the Fast Scan mode, the scan will stop as soon as the first network matching
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the SSID is found. In this mode, an application can set threshold for the
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authentication mode and the Signal strength. Networks that do not meet the
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threshold requirements will be ignored.
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In the All Channel Scan mode, the scan will end only after all the channels
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are scanned, and connection will start with the best network. The networks
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can be sorted based on Authentication Mode or Signal Strength. The priority
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for the Authentication mode is: WPA2 > WPA > WEP > Open
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*/
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#include "freertos/FreeRTOS.h"
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#include "freertos/event_groups.h"
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#include "esp_wifi.h"
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#include "esp_log.h"
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#include "esp_event.h"
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#include "nvs_flash.h"
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/* Set the SSID and Password via project configuration, or can set directly here */
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#define DEFAULT_SSID CONFIG_EXAMPLE_WIFI_SSID
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#define DEFAULT_PWD CONFIG_EXAMPLE_WIFI_PASSWORD
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#if CONFIG_EXAMPLE_WIFI_ALL_CHANNEL_SCAN
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#define DEFAULT_SCAN_METHOD WIFI_ALL_CHANNEL_SCAN
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#elif CONFIG_EXAMPLE_WIFI_FAST_SCAN
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#define DEFAULT_SCAN_METHOD WIFI_FAST_SCAN
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#else
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#define DEFAULT_SCAN_METHOD WIFI_FAST_SCAN
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#endif /*CONFIG_EXAMPLE_SCAN_METHOD*/
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#if CONFIG_EXAMPLE_WIFI_CONNECT_AP_BY_SIGNAL
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#define DEFAULT_SORT_METHOD WIFI_CONNECT_AP_BY_SIGNAL
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#elif CONFIG_EXAMPLE_WIFI_CONNECT_AP_BY_SECURITY
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#define DEFAULT_SORT_METHOD WIFI_CONNECT_AP_BY_SECURITY
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#else
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#define DEFAULT_SORT_METHOD WIFI_CONNECT_AP_BY_SIGNAL
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#endif /*CONFIG_EXAMPLE_SORT_METHOD*/
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#if CONFIG_EXAMPLE_FAST_SCAN_THRESHOLD
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#define DEFAULT_RSSI CONFIG_EXAMPLE_FAST_SCAN_MINIMUM_SIGNAL
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#if CONFIG_EXAMPLE_FAST_SCAN_WEAKEST_AUTHMODE_OPEN
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#define DEFAULT_AUTHMODE WIFI_AUTH_OPEN
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#elif CONFIG_EXAMPLE_FAST_SCAN_WEAKEST_AUTHMODE_WEP
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#define DEFAULT_AUTHMODE WIFI_AUTH_WEP
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#elif CONFIG_EXAMPLE_FAST_SCAN_WEAKEST_AUTHMODE_WPA
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#define DEFAULT_AUTHMODE WIFI_AUTH_WPA_PSK
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#elif CONFIG_EXAMPLE_FAST_SCAN_WEAKEST_AUTHMODE_WPA2
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#define DEFAULT_AUTHMODE WIFI_AUTH_WPA2_PSK
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#else
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#define DEFAULT_AUTHMODE WIFI_AUTH_OPEN
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#endif
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#else
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#define DEFAULT_RSSI -127
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#define DEFAULT_AUTHMODE WIFI_AUTH_OPEN
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#endif /*CONFIG_EXAMPLE_FAST_SCAN_THRESHOLD*/
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static const char *TAG = "scan";
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static void event_handler(void* arg, esp_event_base_t event_base,
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int32_t event_id, void* event_data)
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{
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if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
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esp_wifi_connect();
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} else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
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esp_wifi_connect();
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} else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
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ip_event_got_ip_t* event = (ip_event_got_ip_t*) event_data;
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ESP_LOGI(TAG, "got ip:" IPSTR, IP2STR(&event->ip_info.ip));
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}
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}
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/* Initialize Wi-Fi as sta and set scan method */
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static void fast_scan(void)
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{
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ESP_ERROR_CHECK(esp_netif_init());
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ESP_ERROR_CHECK(esp_event_loop_create_default());
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wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
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ESP_ERROR_CHECK(esp_wifi_init(&cfg));
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ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL, NULL));
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ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler, NULL, NULL));
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// Initialize default station as network interface instance (esp-netif)
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esp_netif_t *sta_netif = esp_netif_create_default_wifi_sta();
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assert(sta_netif);
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// Initialize and start WiFi
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wifi_config_t wifi_config = {
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.sta = {
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.ssid = DEFAULT_SSID,
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.password = DEFAULT_PWD,
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.scan_method = DEFAULT_SCAN_METHOD,
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.sort_method = DEFAULT_SORT_METHOD,
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.threshold.rssi = DEFAULT_RSSI,
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.threshold.authmode = DEFAULT_AUTHMODE,
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},
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};
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ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
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ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
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ESP_ERROR_CHECK(esp_wifi_start());
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}
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void app_main(void)
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{
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// Initialize NVS
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esp_err_t ret = nvs_flash_init();
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if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
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ESP_ERROR_CHECK(nvs_flash_erase());
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ret = nvs_flash_init();
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}
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ESP_ERROR_CHECK( ret );
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fast_scan();
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}
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