HPM6700——以太网通信lwip_udpecho_freertos

HPM6700——以太网通信lwip_udpecho_freertos_socket

1. 概述

本示例展示在FreeRTOS系统下的UDP回送通讯

PC 通过以太网发送UDP数据帧至MCU，MCU将接收的数据帧回发至PC

2. 硬件设置

使用USB Type-C线缆连接PC USB端口和PWR DEBUG端口
使用以太网线缆连接PC以太网端口和开发板RGMII或RMII端口

3. 工程配置

以太网端口配置：参考以太网通用工程设置
以太网DHCP配置
- lwIP sample: 在 CMakeLists.txt中，支持如下配置:
  - sdk_compile_definitions(-DLWIP_DHCP=0): 禁用DHCP功能
  - sdk_compile_definitions(-DLWIP_DHCP=1): 启用DHCP功能

主线程示例

void Main_task(void *pvParameters)
{(void)pvParameters;TimerHandle_t timer_handle;/* Initialize MAC and DMA */enet_init(ENET);/* Initialize LwIP stack */tcpip_init(NULL, NULL);netif_config(&gnetif);udp_echo_init();#if defined(LWIP_DHCP) && LWIP_DHCP/* Start DHCP Client */xTaskCreate(LwIP_DHCP_task, "DHCP", configMINIMAL_STACK_SIZE * 2, &gnetif, DHCP_TASK_PRIO, NULL);
#endifxTaskCreate(netif_update_link_status, "netif update status", configMINIMAL_STACK_SIZE * 2, &gnetif, NETIF_STA_TASK_PRIO, NULL);timer_handle = xTimerCreate((const char *)NULL,(TickType_t)1000,(UBaseType_t)pdTRUE,(void * const)1,(TimerCallbackFunction_t)timer_callback);if (NULL != timer_handle)  {xTimerStart(timer_handle, 0);}vTaskDelete(NULL);
}

UDP_ECHO线程

static void udp_echo_thread(void *arg)
{(void)arg;int sock = -1;char *recv_data;struct sockaddr_in udp_addr, seraddr;int recv_data_len;socklen_t addrlen;while (1) {recv_data = (char *)pvPortMalloc(RECV_DATA);if (recv_data == NULL) {printf("Memory error\n");goto __exit;}sock = socket(AF_INET, SOCK_DGRAM, 0);if (sock < 0) {printf("Socket error\n");goto __exit;}udp_addr.sin_family = AF_INET;udp_addr.sin_addr.s_addr = INADDR_ANY;udp_addr.sin_port = htons(UDP_ECHO_PORT);memset(&(udp_addr.sin_zero), 0, sizeof(udp_addr.sin_zero));if (bind(sock, (struct sockaddr *)&udp_addr, sizeof(struct sockaddr)) == -1) {printf("Bind error\n");goto __exit;}while (1) {recv_data_len = recvfrom(sock, recv_data, RECV_DATA, 0, (struct sockaddr *)&seraddr, &addrlen);sendto(sock, recv_data, recv_data_len, 0, (struct sockaddr *)&seraddr, addrlen);}__exit:if (sock >= 0) {closesocket(sock);}if (recv_data) {free(recv_data);}}
}
/*-----------------------------------------------------------------------------------*/
void udp_echo_init(void)
{sys_thread_new("udp_echo_thread", udp_echo_thread, NULL, DEFAULT_THREAD_STACKSIZE, DEFAULT_THREAD_PRIO);
}

4. 运行示例

编译下载程序

串口终端显示如下信息：

This is an ethernet demo: UDP Echo With Socket API On FreeRTOS
LwIP Version: 2.1.2
Enet phy init passed !
Link Status: Down
Link Status: Up
Link Speed:  1000Mbps
Link Duplex: Full duplex
IPv4 Address: 192.168.100.10
IPv4 Netmask: 255.255.255.0
IPv4 Gateway: 192.168.100.1