开发板购买连接windows
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开发板简介
开发环境搭建 windows
源码示例:
0_Hello Bug (ESP_LOGX与printf) 工程模板/打印调试输出
1_LED LED亮灭控制
2_LED_Task 使用任务方式控制LED
3_LEDC_PWM 使用LEDC来控制LED实现呼吸灯效果
4_ADC_LightR 使用ADC读取光敏电阻实现光照传感
5_KEY_Short_Long 按钮长按短按实现
6_TouchPad_Interrupt 电容触摸中断实现
7_WS2812_RMT 使用RMT实现RGB_LED彩虹变色示例
8_DHT11_RMT 使用RMT实现读取DHT11温湿度传感器
9_SPI_SDCard 使用SPI总线实现TF卡文件系统示例
10_IIC_ADXL345 使用IIC总线实现读取ADXL345角度加速度传感器
11_IIC_AT24C02 使用IIC总线实现小容量数据储存测试
12_IR_Rev_RMT 使用RMT实现红外遥控接收解码(NEC编码)
13_IR_Send_RMT 使用RMT实现红外数据发送(NEC编码)
14_WIFI_Scan 附近WIFI信号扫描示例
15_WIFI_AP 建立软AP示例
16_WIFI_AP_TCP_Server 在软AP模式下实现TCP服务端
17_WIFI_AP_TCP_Client 在软AP模式下实现TCP客户端
18_WIFI_AP_UDP 在软AP模式下实现UDP通信
19_WIFI_STA 建立STA站模
20_WIFI_STA_TCP_Server 在站模式STA下实现TCP服务端
21_WIFI_STA_TCP_Client 在站模式STA下实现TCP客户端
22_WIFI_STA_UDP 在站模式STA下实现UDP通信
23_LVGL_Test LVGL图形库简单示例app
在ESP32的设计开发中,咱们必然会须要使用到wifi或ble功能,今天就讲解下如何将WIFI功能归入到ESP32中来。函数
在 ESP-IDF 中,整个网络协议栈包含的状态定义在头文件 components/esp32/include/esp_event.h
中,由枚举类型 system_event_id_t
定义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 */
认证方式测试
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 */
事件循环库是esp提供的一种事件处理方法,而默认事件循环是用于系统事件(例如WiFi事件)的特殊循环类型,这里建立一个默认事件循环用以处理wifi链接事件ui
ESP_ERROR_CHECK(esp_event_loop_create_default()); // 建立默认事件循环
先引用必要头文件编码
// 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事件处理函数加密
// 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就绪 ESP_LOGI(TAG, "event-->ESP32 WiFi ready"); break; case SYSTEM_EVENT_SCAN_DONE: // 扫描AP完成 ESP_LOGI(TAG, "event-->ESP32 finish scanning AP"); break; case SYSTEM_EVENT_STA_START: // 开始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模式链接到AP ESP_LOGI(TAG, "event-->ESP32 station connected to AP"); break; case SYSTEM_EVENT_STA_DISCONNECTED: // STA模式断开与AP的链接 ESP_LOGI(TAG, "event-->ESP32 station disconnected from AP"); break; case SYSTEM_EVENT_STA_AUTHMODE_CHANGE: // ESP32 Station链接的AP的验证模式已更改 ESP_LOGI(TAG, "event-->the auth mode of AP connected by ESP32 station changed"); break; case SYSTEM_EVENT_STA_GOT_IP: // ESP32 Station从链接的AP获取到IP ESP_LOGI(TAG, "event-->ESP32 station got IP from connected AP"); break; case SYSTEM_EVENT_STA_LOST_IP: // ESP32 Station丢失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在注册模式下成功 ESP_LOGI(TAG, "event--> ESP32 station wps succeeds in enrollee mode"); break; case SYSTEM_EVENT_STA_WPS_ER_FAILED: // ESP32 station wps在注册模式下失败 ESP_LOGI(TAG, "event--> ESP32 station wps fails in enrollee mode"); break; case SYSTEM_EVENT_STA_WPS_ER_TIMEOUT: // ESP32 station wps在注册模式超时 ESP_LOGI(TAG, "event--> ESP32 station wps timeout in enrollee mode"); break; case SYSTEM_EVENT_STA_WPS_ER_PIN: // ESP32 Station WPS密码在登记人模式下 ESP_LOGI(TAG, "event--> ESP32 station wps pin code in enrollee mode"); break; case SYSTEM_EVENT_STA_WPS_ER_PBC_OVERLAP:// ESP32 station wps在登记人模式下重叠 ESP_LOGI(TAG, "event--> ESP32 station wps overlap in enrollee mode"); break; case SYSTEM_EVENT_AP_START: // ESP32 AP模式开始 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,有站断开此AP ESP_LOGI(TAG, "event--> a station disconnected from ESP32 soft-AP "); break; case SYSTEM_EVENT_AP_STAIPASSIGNED: // ESP32 AP模式下,为链接的站分配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接口中接收探测请求数据包 ESP_LOGI(TAG, "event--> Receive probe request packet in soft-AP interface"); break; default: break; } return ESP_OK; }
打印WIFI的认证方式.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 配置扫描模式 开始扫描 打印扫描到的AP信息
// 初始化WIFI 配置扫描模式 开始扫描 打印扫描到的AP信息 static void wifi_scan(void) { ESP_ERROR_CHECK(esp_netif_init()); // 初始化底层TCP/IP堆栈。在应用程序启动时,应该调用此函数一次 ESP_ERROR_CHECK(esp_event_loop_create_default()); // 建立默认事件循环 esp_netif_t *sta_netif = esp_netif_create_default_wifi_sta();// 建立一个默认的WIFI-STA网络接口, assert(sta_netif); // 若是初始化错误,此API将停止 wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT(); ESP_ERROR_CHECK(esp_wifi_init(&cfg)); // 使用默认wifi初始化配置 uint16_t number = DEFAULT_SCAN_LIST_SIZE; // 默认扫描列表大小 wifi_ap_record_t ap_info[DEFAULT_SCAN_LIST_SIZE]; // AP信息结构体大小 uint16_t ap_count = 0; // 初始化AP数量0 memset(ap_info, 0, sizeof(ap_info)); // 初始化AP信息结构体 ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA)); // 设置WiFi的工做模式为 STA ESP_ERROR_CHECK(esp_wifi_start()); // 启动WiFi链接 ESP_ERROR_CHECK(esp_wifi_scan_start(NULL, true)); // 开始扫描WIFI(默认配置,阻塞方式) ESP_ERROR_CHECK(esp_wifi_scan_get_ap_records(&number, ap_info));// 获取搜索的具体AP信息 ESP_ERROR_CHECK(esp_wifi_scan_get_ap_num(&ap_count)); //接入点的数量 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名称 ESP_LOGI(TAG, "RSSI \t\t%d", ap_info[i].rssi); // 打印信号强度 print_auth_mode(ap_info[i].authmode); // 打印认证方式 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); } }
主函数
// 主函数 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(); }
打开ESP-IDF Command Prompt
cd命令进入此工程目录
cd F:\ESP32_DevBoard_File\14_WIFI_Scan
查看电脑设备管理器中开发板的串口号
执行idf.py -p COM9 flash monitor从串口9下载并运行打开口显示设备调试信息 Ctrl+c退出运行