88 lines
3.4 KiB
C
88 lines
3.4 KiB
C
#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.h"
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#include "esp_log.h"
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#include "lwip/err.h"
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#include "lwip/sys.h"
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#include "wifi_connection.h"
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static const char *TAG = "wifi_connection";
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#define WIFI_CONNECTED_BIT BIT0
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#define WIFI_FAIL_BIT BIT1
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static EventGroupHandle_t s_wifi_event_group;
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static uint8_t gRetryCounter = 0;
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static uint8_t gRetryMax = 3;
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static void event_handler(void* arg, esp_event_base_t event_base, int32_t event_id, void* event_data) {
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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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if (gRetryCounter < 3) {
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esp_wifi_connect();
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gRetryCounter++;
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ESP_LOGI(TAG, "retry to connect to the AP");
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} else {
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ESP_LOGI(TAG,"connect to the AP fail");
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xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
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}
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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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gRetryCounter = 0;
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xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
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}
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}
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bool wifi_init(const char* aSsid, const char* aPassword, wifi_auth_mode_t aAuthmode, uint8_t aRetryMax) {
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gRetryCounter = 0;
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gRetryMax = aRetryMax;
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s_wifi_event_group = xEventGroupCreate();
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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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esp_netif_create_default_wifi_sta();
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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_event_handler_instance_t instance_any_id;
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esp_event_handler_instance_t instance_got_ip;
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ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL, &instance_any_id));
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ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler, NULL, &instance_got_ip));
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wifi_config_t wifi_config = {0};
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strcpy((char*) wifi_config.sta.ssid, aSsid);
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strcpy((char*) wifi_config.sta.password, aPassword);
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wifi_config.sta.threshold.authmode = aAuthmode;
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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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ESP_LOGI(TAG, "Connecting to WiFi...");
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/* Waiting until either the connection is established (WIFI_CONNECTED_BIT) or connection failed for the maximum
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* number of re-tries (WIFI_FAIL_BIT). The bits are set by event_handler() (see above) */
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EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group, WIFI_CONNECTED_BIT | WIFI_FAIL_BIT, pdFALSE, pdFALSE, portMAX_DELAY);
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/* xEventGroupWaitBits() returns the bits before the call returned, hence we can test which event actually happened. */
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if (bits & WIFI_CONNECTED_BIT) {
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ESP_LOGI(TAG, "Connected to WiFi");
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return true;
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} else if (bits & WIFI_FAIL_BIT) {
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ESP_LOGE(TAG, "Failed to connect");
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ESP_ERROR_CHECK(esp_wifi_stop());
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} else {
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ESP_LOGE(TAG, "Unknown event received while waiting on connection");
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ESP_ERROR_CHECK(esp_wifi_stop());
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}
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return false;
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}
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