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ESP32 UDP 05

news 2025/6/21 15:26:50

1.在上一文章基础上修改，文章网址

ESP32-Ethernet-04-CSDN博客

2.基本代码

/* Ethernet Basic ExampleThis example code is in the Public Domain (or CC0 licensed, at your option.)Unless required by applicable law or agreed to in writing, thissoftware is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES ORCONDITIONS OF ANY KIND, either express or implied.
*/
#include <stdio.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_netif.h"
#include "esp_eth.h"
#include "esp_event.h"
#include "esp_log.h"
#include "ethernet_init.h"
#include "sdkconfig.h"
#include "nvs_flash.h"
#include "lwip/err.h"
#include "lwip/sockets.h"
#include "lwip/sys.h"
#include <lwip/netdb.h>static const char *TAG = "eth_example";/** Event handler for Ethernet events */
static void eth_event_handler(void *arg, esp_event_base_t event_base,int32_t event_id, void *event_data)
{uint8_t mac_addr[6] = {0};/* we can get the ethernet driver handle from event data */esp_eth_handle_t eth_handle = *(esp_eth_handle_t *)event_data;esp_netif_t *eth_netif=(esp_netif_t *)arg;switch (event_id) {case ETHERNET_EVENT_CONNECTED:esp_netif_dhcpc_stop(eth_netif);esp_netif_ip_info_t eth;esp_netif_set_ip4_addr(&eth.ip,192, 168, 1, 22);esp_netif_set_ip4_addr(&eth.gw,192, 168, 1, 1);esp_netif_set_ip4_addr(&eth.netmask, 255, 255, 255, 0);esp_netif_set_ip_info(eth_netif,&eth);esp_eth_ioctl(eth_handle, ETH_CMD_G_MAC_ADDR, mac_addr);ESP_LOGI(TAG, "Ethernet Link Up");ESP_LOGI(TAG, "Ethernet HW Addr %02x:%02x:%02x:%02x:%02x:%02x",mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3], mac_addr[4], mac_addr[5]);break;case ETHERNET_EVENT_DISCONNECTED:ESP_LOGI(TAG, "Ethernet Link Down");break;case ETHERNET_EVENT_START:ESP_LOGI(TAG, "Ethernet Started");break;case ETHERNET_EVENT_STOP:ESP_LOGI(TAG, "Ethernet Stopped");break;default:break;}
}//IP_EVENT_ETH_GOT_IP的事件处理程序
static void got_ip_event_handler(void *arg, esp_event_base_t event_base,int32_t event_id, void *event_data)
{ip_event_got_ip_t *event = (ip_event_got_ip_t *) event_data;const esp_netif_ip_info_t *ip_info = &event->ip_info;ESP_LOGI(TAG, "Ethernet Got IP Address");ESP_LOGI(TAG, "~~~~~~~~~~~");ESP_LOGI(TAG, "ETHIP:" IPSTR, IP2STR(&ip_info->ip));ESP_LOGI(TAG, "ETHMASK:" IPSTR, IP2STR(&ip_info->netmask));ESP_LOGI(TAG, "ETHGW:" IPSTR, IP2STR(&ip_info->gw));ESP_LOGI(TAG, "~~~~~~~~~~~");
}//UDP 接受任务函数
static void udp_recv_task(void* arg)
{char rx_buffer[128];int sock = *(int *)arg;struct sockaddr_in source_addr; // Large enough for both IPv4 or IPv6socklen_t socklen = sizeof(source_addr);for (;;) {//清空缓存memset(rx_buffer, 0, sizeof(rx_buffer));//接受数据int len = recvfrom(sock, rx_buffer, sizeof(rx_buffer), 0, (struct sockaddr *)&source_addr, &socklen);//发送数据int err = sendto(sock, rx_buffer, len, 0, (struct sockaddr *)&source_addr, sizeof(source_addr));if(err < 0) {printf("Error occurred during sending: errno %d", errno);}}
}void app_main(void)
{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();}//初始化TCP/IP网络接口esp_netif_init();//创建一个在后台运行的默认事件循环esp_event_loop_create_default();//初始化MAC和PHY默认配置eth_mac_config_t mac_config = ETH_MAC_DEFAULT_CONFIG();eth_phy_config_t phy_config = ETH_PHY_DEFAULT_CONFIG();//PHY地址和复位引脚配置phy_config.phy_addr = CONFIG_EXAMPLE_ETH_PHY_ADDR;phy_config.reset_gpio_num = CONFIG_EXAMPLE_ETH_PHY_RST_GPIO;//初始化EMAC默认配置eth_esp32_emac_config_t esp32_emac_config = ETH_ESP32_EMAC_DEFAULT_CONFIG();//MDC的信号引脚esp32_emac_config.smi_mdc_gpio_num = CONFIG_EXAMPLE_ETH_MDC_GPIO;//MDIO的信号引脚esp32_emac_config.smi_mdio_gpio_num = CONFIG_EXAMPLE_ETH_MDIO_GPIO;//创建MAC实例esp_eth_mac_t *mac = esp_eth_mac_new_esp32(&esp32_emac_config, &mac_config);//创建PHY实例esp_eth_phy_t *phy = esp_eth_phy_new_lan87xx(&phy_config);//驱动程序安装完毕后，将得到驱动程序的句柄esp_eth_handle_t eth_handle = NULL;//应用默认驱动程序配置esp_eth_config_t config = ETH_DEFAULT_CONFIG(mac, phy);//安装驱动程序esp_eth_driver_install(&config, &eth_handle);//应用以太网默认的网络接口配置esp_netif_config_t cfg = ESP_NETIF_DEFAULT_ETH();//为以太网驱动程序创建网络接口esp_netif_t *eth_netif = esp_netif_new(&cfg);//将以太网驱动程序连接至TCP/IP协议栈esp_netif_attach(eth_netif, esp_eth_new_netif_glue(eth_handle));//注册以太网事件处理程序esp_event_handler_register(ETH_EVENT, ESP_EVENT_ANY_ID, &eth_event_handler, eth_netif);//注册用户定义的IP事件处理程序esp_event_handler_register(IP_EVENT, IP_EVENT_ETH_GOT_IP, &got_ip_event_handler, eth_netif);//启动以太网驱动程序状态机esp_eth_start(eth_handle);//新建socketint sock =  socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);//绑定本机地址的IP和端口struct sockaddr_in dest_addr;dest_addr.sin_family = AF_INET;dest_addr.sin_addr.s_addr = htonl(INADDR_ANY);dest_addr.sin_port = htons(10000);//绑定本机IPint err = bind(sock, (struct sockaddr *)&dest_addr, sizeof(dest_addr));if(err < 0){printf("Socket unable to bind: errno %d", errno);close(sock);}//创建任务xTaskCreate(udp_recv_task, "udp_recv_task", 2048, &sock, 10, NULL);
}