mirror of
https://github.com/espressif/esp-idf.git
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109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/* WiFi station 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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#include <string.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/event_groups.h"
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#include "esp_system.h"
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#include "esp_wifi.h"
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#include "esp_event_loop.h"
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#include "esp_log.h"
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#include "nvs_flash.h"
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#include "lwip/err.h"
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#include "lwip/sys.h"
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/* The examples use WiFi configuration that you can set via 'make menuconfig'.
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If you'd rather not, just change the below entries to strings with
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the config you want - ie #define EXAMPLE_WIFI_SSID "mywifissid"
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*/
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#define EXAMPLE_ESP_WIFI_SSID CONFIG_ESP_WIFI_SSID
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#define EXAMPLE_ESP_WIFI_PASS CONFIG_ESP_WIFI_PASSWORD
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#define EXAMPLE_ESP_MAXIMUM_RETRY CONFIG_ESP_MAXIMUM_RETRY
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/* FreeRTOS event group to signal when we are connected*/
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static EventGroupHandle_t s_wifi_event_group;
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/* The event group allows multiple bits for each event, but we only care about one event
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* - are we connected to the AP with an IP? */
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const int WIFI_CONNECTED_BIT = BIT0;
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static const char *TAG = "wifi station";
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static int s_retry_num = 0;
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static esp_err_t event_handler(void *ctx, system_event_t *event)
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{
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switch(event->event_id) {
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case SYSTEM_EVENT_STA_START:
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esp_wifi_connect();
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break;
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case SYSTEM_EVENT_STA_GOT_IP:
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ESP_LOGI(TAG, "got ip:%s",
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ip4addr_ntoa(&event->event_info.got_ip.ip_info.ip));
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s_retry_num = 0;
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xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
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break;
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case SYSTEM_EVENT_STA_DISCONNECTED:
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{
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if (s_retry_num < EXAMPLE_ESP_MAXIMUM_RETRY) {
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esp_wifi_connect();
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xEventGroupClearBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
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s_retry_num++;
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ESP_LOGI(TAG,"retry to connect to the AP");
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}
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ESP_LOGI(TAG,"connect to the AP fail\n");
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break;
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}
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default:
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break;
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}
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return ESP_OK;
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}
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void wifi_init_sta()
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{
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s_wifi_event_group = xEventGroupCreate();
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tcpip_adapter_init();
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ESP_ERROR_CHECK(esp_event_loop_init(event_handler, NULL) );
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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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wifi_config_t wifi_config = {
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.sta = {
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.ssid = EXAMPLE_ESP_WIFI_SSID,
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.password = EXAMPLE_ESP_WIFI_PASS
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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(ESP_IF_WIFI_STA, &wifi_config) );
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ESP_ERROR_CHECK(esp_wifi_start() );
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ESP_LOGI(TAG, "wifi_init_sta finished.");
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ESP_LOGI(TAG, "connect to ap SSID:%s password:%s",
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EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
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}
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void app_main()
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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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ESP_LOGI(TAG, "ESP_WIFI_MODE_STA");
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wifi_init_sta();
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}
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