basic wifi station

.gitignore

@@ -1,3 +1,4 @@
+secrets.h
 
 # esp-idf stuff
 build/

main/main.c

@@ -1,14 +1,127 @@
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
+#include "freertos/event_groups.h"
+#include "esp_system.h"
+#include "esp_wifi.h"
+#include "esp_event.h"
+#include "esp_log.h"
+#include "lwip/err.h"
+#include "lwip/sys.h"
 #include "nvs_flash.h"
 #include "nvs.h"
-#include "esp_log.h"
-#include "esp_err.h"
 #include "esp_check.h"
 #include "esp_memory_utils.h"
 #include "lvgl.h"
 #include "bsp/esp-bsp.h"
 #include "bsp/display.h"
+#include "secrets.h"
+
+/* FreeRTOS event group to signal when we are connected*/
+static EventGroupHandle_t s_wifi_event_group;
+
+/* The event group allows multiple bits for each event, but we only care about two events:
+ * - we are connected to the AP with an IP
+ * - we failed to connect after the maximum amount of retries */
+#define WIFI_CONNECTED_BIT BIT0
+#define WIFI_FAIL_BIT      BIT1
+
+static EventGroupHandle_t s_wifi_event_group;
+
+static const char *TAG = "wifi station";
+
+static int s_retry_num = 0;
+
+
+static void event_handler(void* arg, esp_event_base_t event_base,
+                                int32_t event_id, void* event_data)
+{
+    if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
+        esp_wifi_connect();
+    } else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
+        if (s_retry_num < 10000) {
+            esp_wifi_connect();
+            s_retry_num++;
+            ESP_LOGI(TAG, "retry to connect to the AP");
+        } else {
+            xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
+        }
+        ESP_LOGI(TAG,"connect to the AP fail");
+    } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
+        ip_event_got_ip_t* event = (ip_event_got_ip_t*) event_data;
+        ESP_LOGI(TAG, "got ip:" IPSTR, IP2STR(&event->ip_info.ip));
+        s_retry_num = 0;
+        xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
+    }
+}
+
+void wifi_init_sta(void)
+{
+    s_wifi_event_group = xEventGroupCreate();
+
+    ESP_ERROR_CHECK(esp_netif_init());
+
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    esp_netif_create_default_wifi_sta();
+
+    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
+
+    esp_event_handler_instance_t instance_any_id;
+    esp_event_handler_instance_t instance_got_ip;
+    ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT,
+                                                        ESP_EVENT_ANY_ID,
+                                                        &event_handler,
+                                                        NULL,
+                                                        &instance_any_id));
+    ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT,
+                                                        IP_EVENT_STA_GOT_IP,
+                                                        &event_handler,
+                                                        NULL,
+                                                        &instance_got_ip));
+
+
+    wifi_config_t wifi_config = {
+        .sta = {
+            .ssid = WIFI_SSID,
+            .password = WIFI_PASS,
+            /* Authmode threshold resets to WPA2 as default if password matches WPA2 standards (password len => 8).
+             * If you want to connect the device to deprecated WEP/WPA networks, Please set the threshold value
+             * to WIFI_AUTH_WEP/WIFI_AUTH_WPA_PSK and set the password with length and format matching to
+             * WIFI_AUTH_WEP/WIFI_AUTH_WPA_PSK standards.
+             */
+            .threshold.authmode = WIFI_AUTH_OPEN,
+            //.sae_pwe_h2e = WPA3_SAE_PWE_BOTH,
+            //.sae_h2e_identifier = CONFIG_ESP_WIFI_PW_ID,
+	    //            .disable_wpa3_compatible_mode = 0,
+        },
+    };
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA) );
+    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config) );
+    ESP_ERROR_CHECK(esp_wifi_start() );
+
+    ESP_LOGI(TAG, "wifi_init_sta finished.");
+
+    /* Waiting until either the connection is established (WIFI_CONNECTED_BIT) or connection failed for the maximum
+     * number of re-tries (WIFI_FAIL_BIT). The bits are set by event_handler() (see above) */
+    EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group,
+            WIFI_CONNECTED_BIT | WIFI_FAIL_BIT,
+            pdFALSE,
+            pdFALSE,
+            portMAX_DELAY);
+
+    /* xEventGroupWaitBits() returns the bits before the call returned, hence we can test which event actually
+     * happened. */
+    if (bits & WIFI_CONNECTED_BIT) {
+        ESP_LOGI(TAG, "connected to ap SSID:%s password:%s",
+                 WIFI_SSID, WIFI_PASS);
+    } else if (bits & WIFI_FAIL_BIT) {
+        ESP_LOGI(TAG, "Failed to connect to SSID:%s, password:%s",
+                 WIFI_SSID, WIFI_PASS);
+    } else {
+        ESP_LOGE(TAG, "UNEXPECTED EVENT");
+    }
+}
+
 
 static const lv_font_t * font_large;
 static lv_style_t style_bw;
@@ -16,6 +129,19 @@ static lv_style_t style_bw;
 void app_main(void)
 {
 
+  //Initialize NVS
+  esp_err_t ret = nvs_flash_init();
+  if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
+    ESP_ERROR_CHECK(nvs_flash_erase());
+    ret = nvs_flash_init();
+  }
+  ESP_ERROR_CHECK(ret);
+  
+
+
+  ESP_LOGI(TAG, "ESP_WIFI_MODE_STA");
+  wifi_init_sta();
+  
     bsp_display_start();
 
     bsp_display_lock(100);