esp32 build, cli

[matrix_esp_thesis] / esp32 / esp_project / main / wifi.c

diff --git a/esp32/esp_project/main/wifi.c b/esp32/esp_project/main/wifi.c
new file mode 100644 (file)
index 0000000..07d1e41
--- /dev/null
+++ b/esp32/esp_project/main/wifi.c
@@ -0,0 +1,104 @@
+// Code taken from the ESP32 IDF WiFi station Example\r
+\r
+#include <string.h>\r
+#include "esp_event.h"\r
+#include "esp_log.h"\r
+#include "esp_system.h"\r
+#include "esp_wifi.h"\r
+#include "freertos/FreeRTOS.h"\r
+#include "freertos/event_groups.h"\r
+#include "freertos/task.h"\r
+#include "nvs_flash.h"\r
+\r
+#include "lwip/err.h"\r
+#include "lwip/sys.h"\r
+\r
+#include "mongoose.h"\r
+\r
+static EventGroupHandle_t s_wifi_event_group;\r
+\r
+/* The event group allows multiple bits for each event, but we only care about\r
+ * two events:\r
+ * - we are connected to the AP with an IP\r
+ * - we failed to connect after the maximum amount of retries */\r
+#define WIFI_CONNECTED_BIT BIT0\r
+#define WIFI_FAIL_BIT BIT1\r
+\r
+static int s_retry_num = 0;\r
+\r
+static void event_handler(void *arg, esp_event_base_t event_base,\r
+                          int32_t event_id, void *event_data) {\r
+  if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {\r
+    esp_wifi_connect();\r
+  } else if (event_base == WIFI_EVENT &&\r
+             event_id == WIFI_EVENT_STA_DISCONNECTED) {\r
+    if (s_retry_num < 3) {\r
+      esp_wifi_connect();\r
+      s_retry_num++;\r
+      MG_INFO(("retry to connect to the AP"));\r
+    } else {\r
+      xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);\r
+    }\r
+    MG_ERROR(("connect to the AP fail"));\r
+  } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {\r
+    ip_event_got_ip_t *event = (ip_event_got_ip_t *) event_data;\r
+    MG_INFO(("IP ADDRESS:" IPSTR, IP2STR(&event->ip_info.ip)));\r
+    s_retry_num = 0;\r
+    xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);\r
+  }\r
+}\r
+\r
+void wifi_init(const char *ssid, const char *pass) {\r
+  esp_err_t ret = nvs_flash_init();\r
+  if (ret == ESP_ERR_NVS_NO_FREE_PAGES ||\r
+      ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {\r
+    ESP_ERROR_CHECK(nvs_flash_erase());\r
+    ret = nvs_flash_init();\r
+  }\r
+  ESP_ERROR_CHECK(ret);\r
+\r
+  s_wifi_event_group = xEventGroupCreate();\r
+\r
+  ESP_ERROR_CHECK(esp_netif_init());\r
+\r
+  ESP_ERROR_CHECK(esp_event_loop_create_default());\r
+  esp_netif_create_default_wifi_sta();\r
+\r
+  wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();\r
+  ESP_ERROR_CHECK(esp_wifi_init(&cfg));\r
+\r
+  esp_event_handler_instance_t instance_any_id;\r
+  esp_event_handler_instance_t instance_got_ip;\r
+  ESP_ERROR_CHECK(esp_event_handler_instance_register(\r
+      WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL, &instance_any_id));\r
+  ESP_ERROR_CHECK(esp_event_handler_instance_register(\r
+      IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler, NULL, &instance_got_ip));\r
+\r
+  wifi_config_t c = {.sta = {.threshold = {.authmode = WIFI_AUTH_WPA2_PSK},\r
+                             .pmf_cfg = {.capable = true, .required = false}}};\r
+  snprintf((char *) c.sta.ssid, sizeof(c.sta.ssid), "%s", ssid);\r
+  snprintf((char *) c.sta.password, sizeof(c.sta.password), "%s", pass);\r
+  ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));\r
+  ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_STA, &c));\r
+  ESP_ERROR_CHECK(esp_wifi_start());\r
+  MG_DEBUG(("wifi_init_sta finished."));\r
+\r
+  EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group,\r
+                                         WIFI_CONNECTED_BIT | WIFI_FAIL_BIT,\r
+                                         pdFALSE, pdFALSE, portMAX_DELAY);\r
+\r
+  if (bits & WIFI_CONNECTED_BIT) {\r
+    MG_INFO(("connected to ap SSID:%s password:%s", ssid, pass));\r
+  } else if (bits & WIFI_FAIL_BIT) {\r
+    MG_ERROR(("Failed to connect to SSID:%s, password:%s", ssid, pass));\r
+  } else {\r
+    MG_ERROR(("UNEXPECTED EVENT"));\r
+  }\r
+\r
+  /* The event will not be processed after unregister */\r
+  ESP_ERROR_CHECK(esp_event_handler_instance_unregister(\r
+      IP_EVENT, IP_EVENT_STA_GOT_IP, instance_got_ip));\r
+  ESP_ERROR_CHECK(esp_event_handler_instance_unregister(\r
+      WIFI_EVENT, ESP_EVENT_ANY_ID, instance_any_id));\r
+  vEventGroupDelete(s_wifi_event_group);\r
+}
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