開發板購買連接windows
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開發板簡介
開發環境搭建 windows
源碼示例:
0_Hello Bug (ESP_LOGX與printf) 工程模板/打印調試輸出
1_LED LED亮滅控制
2_LED_Task 使用任務方式控制LED
3_LEDC_PWM 使用LEDC來控制LED實現呼吸燈效果
4_ADC_LightR 使用ADC讀取光敏電阻實現光照傳感
5_KEY_Short_Long 按鈕長按短按實現
6_TouchPad_Interrupt 電容觸摸中斷實現
7_WS2812_RMT 使用RMT實現RGB_LED彩虹變色示例
8_DHT11_RMT 使用RMT實現讀取DHT11溫溼度傳感器
9_SPI_SDCard 使用SPI總線實現TF卡文件系統示例
10_IIC_ADXL345 使用IIC總線實現讀取ADXL345角度加速度傳感器
11_IIC_AT24C02 使用IIC總線實現小容量數據儲存測試
12_IR_Rev_RMT 使用RMT實現紅外遙控接收解碼(NEC編碼)
13_IR_Send_RMT 使用RMT實現紅外數據發送(NEC編碼)
14_WIFI_Scan 附近WIFI信號掃描示例
15_WIFI_AP 建立軟AP示例
16_WIFI_AP_TCP_Server 在軟AP模式下實現TCP服務端
17_WIFI_AP_TCP_Client 在軟AP模式下實現TCP客戶端
18_WIFI_AP_UDP 在軟AP模式下實現UDP通信
19_WIFI_STA 建立STA站模
20_WIFI_STA_TCP_Server 在站模式STA下實現TCP服務端
21_WIFI_STA_TCP_Client 在站模式STA下實現TCP客戶端
22_WIFI_STA_UDP 在站模式STA下實現UDP通信
23_LVGL_Test LVGL圖形庫簡單示例app
在ESP32的設計開發中,咱們必然會須要使用到wifi或ble功能,今天就講解下如何將WIFI功能歸入到ESP32中來。函數
在 ESP-IDF 中,整個網絡協議棧包含的狀態定義在頭文件 components/esp32/include/esp_event.h
中,由枚舉類型 system_event_id_t
定義oop
SYSTEM_EVENT_WIFI_READY = 0, /*!< ESP32 WiFi ready */ SYSTEM_EVENT_SCAN_DONE, /*!< ESP32 finish scanning AP */ SYSTEM_EVENT_STA_START, /*!< ESP32 station start */ SYSTEM_EVENT_STA_STOP, /*!< ESP32 station stop */ SYSTEM_EVENT_STA_CONNECTED, /*!< ESP32 station connected to AP */ SYSTEM_EVENT_STA_DISCONNECTED, /*!< ESP32 station disconnected from AP */ SYSTEM_EVENT_STA_AUTHMODE_CHANGE, /*!< the auth mode of AP connected by ESP32 station changed */ SYSTEM_EVENT_STA_GOT_IP, /*!< ESP32 station got IP from connected AP */ SYSTEM_EVENT_STA_LOST_IP, /*!< ESP32 station lost IP and the IP is reset to 0 */ SYSTEM_EVENT_STA_WPS_ER_SUCCESS, /*!< ESP32 station wps succeeds in enrollee mode */ SYSTEM_EVENT_STA_WPS_ER_FAILED, /*!< ESP32 station wps fails in enrollee mode */ SYSTEM_EVENT_STA_WPS_ER_TIMEOUT, /*!< ESP32 station wps timeout in enrollee mode */ SYSTEM_EVENT_STA_WPS_ER_PIN, /*!< ESP32 station wps pin code in enrollee mode */ SYSTEM_EVENT_STA_WPS_ER_PBC_OVERLAP, /*!< ESP32 station wps overlap in enrollee mode */ SYSTEM_EVENT_AP_START, /*!< ESP32 soft-AP start */ SYSTEM_EVENT_AP_STOP, /*!< ESP32 soft-AP stop */ SYSTEM_EVENT_AP_STACONNECTED, /*!< a station connected to ESP32 soft-AP */ SYSTEM_EVENT_AP_STADISCONNECTED, /*!< a station disconnected from ESP32 soft-AP */ SYSTEM_EVENT_AP_STAIPASSIGNED, /*!< ESP32 soft-AP assign an IP to a connected station */ SYSTEM_EVENT_AP_PROBEREQRECVED, /*!< Receive probe request packet in soft-AP interface */ SYSTEM_EVENT_GOT_IP6, /*!< ESP32 station or ap or ethernet interface v6IP addr is preferred */ SYSTEM_EVENT_ETH_START, /*!< ESP32 ethernet start */ SYSTEM_EVENT_ETH_STOP, /*!< ESP32 ethernet stop */ SYSTEM_EVENT_ETH_CONNECTED, /*!< ESP32 ethernet phy link up */ SYSTEM_EVENT_ETH_DISCONNECTED, /*!< ESP32 ethernet phy link down */ SYSTEM_EVENT_ETH_GOT_IP, /*!< ESP32 ethernet got IP from connected AP */
認證方式測試
WIFI_AUTH_OPEN = 0, /**< authenticate mode : open */ WIFI_AUTH_WEP, /**< authenticate mode : WEP */ WIFI_AUTH_WPA_PSK, /**< authenticate mode : WPA_PSK */ WIFI_AUTH_WPA2_PSK, /**< authenticate mode : WPA2_PSK */ WIFI_AUTH_WPA_WPA2_PSK, /**< authenticate mode : WPA_WPA2_PSK */ WIFI_AUTH_WPA2_ENTERPRISE, /**< authenticate mode : WPA2_ENTERPRISE */ WIFI_AUTH_WPA3_PSK, /**< authenticate mode : WPA3_PSK */ WIFI_AUTH_WPA2_WPA3_PSK, /**< authenticate mode : WPA2_WPA3_PSK */
事件循環庫是esp提供的一種事件處理方法,而默認事件循環是用於系統事件(例如WiFi事件)的特殊循環類型,這裏建立一個默認事件循環用以處理wifi鏈接事件ui
ESP_ERROR_CHECK(esp_event_loop_create_default()); // 建立默認事件循環
先引用必要頭文件編碼
// WIFI_Scan Example #include <string.h> #include "freertos/FreeRTOS.h" #include "freertos/event_groups.h" #include "esp_wifi.h" #include "esp_log.h" #include "esp_event.h" #include "nvs_flash.h" #include "freertos/event_groups.h"
WIFI事件處理函數加密
// wifi 事件 static esp_err_t event_handler(void *ctx, system_event_t *event) { switch (event->event_id) { case SYSTEM_EVENT_WIFI_READY: // ESP32 WIFI就緒 ESP_LOGI(TAG, "event-->ESP32 WiFi ready"); break; case SYSTEM_EVENT_SCAN_DONE: // 掃描AP完成 ESP_LOGI(TAG, "event-->ESP32 finish scanning AP"); break; case SYSTEM_EVENT_STA_START: // 開始STA模式 ESP_LOGI(TAG, "event-->ESP32 station start"); break; case SYSTEM_EVENT_STA_STOP: // 中止STA模式 ESP_LOGI(TAG, "event-->ESP32 station stop"); break; case SYSTEM_EVENT_STA_CONNECTED: // STA模式鏈接到AP ESP_LOGI(TAG, "event-->ESP32 station connected to AP"); break; case SYSTEM_EVENT_STA_DISCONNECTED: // STA模式斷開與AP的鏈接 ESP_LOGI(TAG, "event-->ESP32 station disconnected from AP"); break; case SYSTEM_EVENT_STA_AUTHMODE_CHANGE: // ESP32 Station鏈接的AP的驗證模式已更改 ESP_LOGI(TAG, "event-->the auth mode of AP connected by ESP32 station changed"); break; case SYSTEM_EVENT_STA_GOT_IP: // ESP32 Station從鏈接的AP獲取到IP ESP_LOGI(TAG, "event-->ESP32 station got IP from connected AP"); break; case SYSTEM_EVENT_STA_LOST_IP: // ESP32 Station丟失IP或IP重置 ESP_LOGI(TAG, "event-->ESP32 station lost IP and the IP is reset to 0"); break; case SYSTEM_EVENT_STA_WPS_ER_SUCCESS: // ESP32 station wps在註冊模式下成功 ESP_LOGI(TAG, "event--> ESP32 station wps succeeds in enrollee mode"); break; case SYSTEM_EVENT_STA_WPS_ER_FAILED: // ESP32 station wps在註冊模式下失敗 ESP_LOGI(TAG, "event--> ESP32 station wps fails in enrollee mode"); break; case SYSTEM_EVENT_STA_WPS_ER_TIMEOUT: // ESP32 station wps在註冊模式超時 ESP_LOGI(TAG, "event--> ESP32 station wps timeout in enrollee mode"); break; case SYSTEM_EVENT_STA_WPS_ER_PIN: // ESP32 Station WPS密碼在登記人模式下 ESP_LOGI(TAG, "event--> ESP32 station wps pin code in enrollee mode"); break; case SYSTEM_EVENT_STA_WPS_ER_PBC_OVERLAP:// ESP32 station wps在登記人模式下重疊 ESP_LOGI(TAG, "event--> ESP32 station wps overlap in enrollee mode"); break; case SYSTEM_EVENT_AP_START: // ESP32 AP模式開始 ESP_LOGI(TAG, "event--> ESP32 soft-AP start"); break; case SYSTEM_EVENT_AP_STOP: // ESP32 AP模式中止 ESP_LOGI(TAG, "event--> ESP32 soft-AP stop"); break; case SYSTEM_EVENT_AP_STACONNECTED: // ESP32 AP模式下,有站接入此AP ESP_LOGI(TAG, "event--> a station connected to ESP32 soft-AP "); break; case SYSTEM_EVENT_AP_STADISCONNECTED: // ESP32 AP模式下,有站斷開此AP ESP_LOGI(TAG, "event--> a station disconnected from ESP32 soft-AP "); break; case SYSTEM_EVENT_AP_STAIPASSIGNED: // ESP32 AP模式下,爲鏈接的站分配IP ESP_LOGI(TAG, "event--> ESP32 soft-AP assign an IP to a connected station"); break; case SYSTEM_EVENT_AP_PROBEREQRECVED: // ESP32 AP模式下,在soft-AP接口中接收探測請求數據包 ESP_LOGI(TAG, "event--> Receive probe request packet in soft-AP interface"); break; default: break; } return ESP_OK; }
打印WIFI的認證方式.net
static void print_auth_mode(int authmode) { switch (authmode) { case WIFI_AUTH_OPEN: ESP_LOGI(TAG, "Authmode \tWIFI_AUTH_OPEN"); break; case WIFI_AUTH_WEP: ESP_LOGI(TAG, "Authmode \tWIFI_AUTH_WEP"); break; case WIFI_AUTH_WPA_PSK: ESP_LOGI(TAG, "Authmode \tWIFI_AUTH_WPA_PSK"); break; case WIFI_AUTH_WPA2_PSK: ESP_LOGI(TAG, "Authmode \tWIFI_AUTH_WPA2_PSK"); break; case WIFI_AUTH_WPA_WPA2_PSK: ESP_LOGI(TAG, "Authmode \tWIFI_AUTH_WPA_WPA2_PSK"); break; case WIFI_AUTH_WPA2_ENTERPRISE: ESP_LOGI(TAG, "Authmode \tWIFI_AUTH_WPA2_ENTERPRISE"); break; case WIFI_AUTH_WPA3_PSK: ESP_LOGI(TAG, "Authmode \tWIFI_AUTH_WPA3_PSK"); break; case WIFI_AUTH_WPA2_WPA3_PSK: ESP_LOGI(TAG, "Authmode \tWIFI_AUTH_WPA2_WPA3_PSK"); break; default: ESP_LOGI(TAG, "Authmode \tWIFI_AUTH_UNKNOWN"); break; } }
打印WIFI的加密方式
static void print_cipher_type(int pairwise_cipher, int group_cipher) { switch (pairwise_cipher) { case WIFI_CIPHER_TYPE_NONE: ESP_LOGI(TAG, "Pairwise Cipher \tWIFI_CIPHER_TYPE_NONE"); break; case WIFI_CIPHER_TYPE_WEP40: ESP_LOGI(TAG, "Pairwise Cipher \tWIFI_CIPHER_TYPE_WEP40"); break; case WIFI_CIPHER_TYPE_WEP104: ESP_LOGI(TAG, "Pairwise Cipher \tWIFI_CIPHER_TYPE_WEP104"); break; case WIFI_CIPHER_TYPE_TKIP: ESP_LOGI(TAG, "Pairwise Cipher \tWIFI_CIPHER_TYPE_TKIP"); break; case WIFI_CIPHER_TYPE_CCMP: ESP_LOGI(TAG, "Pairwise Cipher \tWIFI_CIPHER_TYPE_CCMP"); break; case WIFI_CIPHER_TYPE_TKIP_CCMP: ESP_LOGI(TAG, "Pairwise Cipher \tWIFI_CIPHER_TYPE_TKIP_CCMP"); break; default: ESP_LOGI(TAG, "Pairwise Cipher \tWIFI_CIPHER_TYPE_UNKNOWN"); break; } switch (group_cipher) { case WIFI_CIPHER_TYPE_NONE: ESP_LOGI(TAG, "Group Cipher \tWIFI_CIPHER_TYPE_NONE"); break; case WIFI_CIPHER_TYPE_WEP40: ESP_LOGI(TAG, "Group Cipher \tWIFI_CIPHER_TYPE_WEP40"); break; case WIFI_CIPHER_TYPE_WEP104: ESP_LOGI(TAG, "Group Cipher \tWIFI_CIPHER_TYPE_WEP104"); break; case WIFI_CIPHER_TYPE_TKIP: ESP_LOGI(TAG, "Group Cipher \tWIFI_CIPHER_TYPE_TKIP"); break; case WIFI_CIPHER_TYPE_CCMP: ESP_LOGI(TAG, "Group Cipher \tWIFI_CIPHER_TYPE_CCMP"); break; case WIFI_CIPHER_TYPE_TKIP_CCMP: ESP_LOGI(TAG, "Group Cipher \tWIFI_CIPHER_TYPE_TKIP_CCMP"); break; default: ESP_LOGI(TAG, "Group Cipher \tWIFI_CIPHER_TYPE_UNKNOWN"); break; } }
初始化WIFI 配置掃描模式 開始掃描 打印掃描到的AP信息
// 初始化WIFI 配置掃描模式 開始掃描 打印掃描到的AP信息 static void wifi_scan(void) { ESP_ERROR_CHECK(esp_netif_init()); // 初始化底層TCP/IP堆棧。在應用程序啓動時,應該調用此函數一次 ESP_ERROR_CHECK(esp_event_loop_create_default()); // 建立默認事件循環 esp_netif_t *sta_netif = esp_netif_create_default_wifi_sta();// 建立一個默認的WIFI-STA網絡接口, assert(sta_netif); // 若是初始化錯誤,此API將停止 wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT(); ESP_ERROR_CHECK(esp_wifi_init(&cfg)); // 使用默認wifi初始化配置 uint16_t number = DEFAULT_SCAN_LIST_SIZE; // 默認掃描列表大小 wifi_ap_record_t ap_info[DEFAULT_SCAN_LIST_SIZE]; // AP信息結構體大小 uint16_t ap_count = 0; // 初始化AP數量0 memset(ap_info, 0, sizeof(ap_info)); // 初始化AP信息結構體 ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA)); // 設置WiFi的工做模式爲 STA ESP_ERROR_CHECK(esp_wifi_start()); // 啓動WiFi鏈接 ESP_ERROR_CHECK(esp_wifi_scan_start(NULL, true)); // 開始掃描WIFI(默認配置,阻塞方式) ESP_ERROR_CHECK(esp_wifi_scan_get_ap_records(&number, ap_info));// 獲取搜索的具體AP信息 ESP_ERROR_CHECK(esp_wifi_scan_get_ap_num(&ap_count)); //接入點的數量 ESP_LOGI(TAG, "Total APs scanned = %u", ap_count); for (int i = 0; (i < DEFAULT_SCAN_LIST_SIZE) && (i < ap_count); i++) { ESP_LOGI(TAG, "SSID \t\t%s", ap_info[i].ssid); // 打印WIFI名稱 ESP_LOGI(TAG, "RSSI \t\t%d", ap_info[i].rssi); // 打印信號強度 print_auth_mode(ap_info[i].authmode); // 打印認證方式 if (ap_info[i].authmode != WIFI_AUTH_WEP) { print_cipher_type(ap_info[i].pairwise_cipher, ap_info[i].group_cipher); } ESP_LOGI(TAG, "Channel \t\t%d\n", ap_info[i].primary); } }
主函數
// 主函數 void app_main(void) { ESP_LOGI(TAG, "APP Start......"); // 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 ); wifi_scan(); }
打開ESP-IDF Command Prompt
cd命令進入此工程目錄
cd F:\ESP32_DevBoard_File\14_WIFI_Scan
查看電腦設備管理器中開發板的串口號
執行idf.py -p COM9 flash monitor從串口9下載並運行打開口顯示設備調試信息 Ctrl+c退出運行