freertos pppos服务器代码

以下是基于 FreeRTOS 的 PPPoS 服务器代码示例。该示例使用了 lwIP 协议栈来实现 PPPoS 服务器功能。

/* FreeRTOS PPPoS server example using lwIP */
#include <stdio.h>
#include <stdlib.h>
#include "FreeRTOS.h"
#include "task.h"
#include "semphr.h"
#include "queue.h"
#include "timers.h"
#include "lwip/err.h"
#include "lwip/sys.h"
#include "lwip/api.h"
#include "lwip/opt.h"
#include "lwip/tcpip.h"
#include "lwip/netif.h"
#include "netif/ppp/pppos.h"

/* PPPoS server configuration */
#define PPP_SERVER_DEVICE_NAME "ppp0"
#define PPP_SERVER_IPADDR "192.168.1.1"
#define PPP_SERVER_NETMASK "255.255.255.0"
#define PPP_SERVER_GATEWAY "192.168.1.254"
#define PPP_SERVER_USERNAME "user"
#define PPP_SERVER_PASSWORD "password"

/* PPPoS server task */
static void pppos_server_task(void *pvParameters)
{
    LWIP_UNUSED_ARG(pvParameters);
    
    /* Create PPPoS server netif */
    struct netif pppos_server_netif;
    memset(&pppos_server_netif, 0, sizeof(pppos_server_netif));
    pppos_server_netif.name[0] = PPP_SERVER_DEVICE_NAME[0];
    pppos_server_netif.mtu = PPP_MRU;
    pppos_server_netif.flags = NETIF_FLAG_POINTTOPOINT | NETIF_FLAG_UP;
    pppos_server_netif.output = pppos_output_cb;
    pppos_server_netif.state = pppos_create(&pppos_server_netif, ppp_input_cb, ppp_output_cb, ppp_link_status_cb, NULL);
    
    /* Set PPPoS server IP configuration */
    ip4_addr_t ipaddr, netmask, gw;
    IP4_ADDR(&ipaddr, PPP_SERVER_IPADDR[0], PPP_SERVER_IPADDR[1], PPP_SERVER_IPADDR[2], PPP_SERVER_IPADDR[3]);
    IP4_ADDR(&netmask, PPP_SERVER_NETMASK[0], PPP_SERVER_NETMASK[1], PPP_SERVER_NETMASK[2], PPP_SERVER_NETMASK[3]);
    IP4_ADDR(&gw, PPP_SERVER_GATEWAY[0], PPP_SERVER_GATEWAY[1], PPP_SERVER_GATEWAY[2], PPP_SERVER_GATEWAY[3]);
    netif_set_addr(&pppos_server_netif, &ipaddr, &netmask, &gw);
    
    /* Start PPPoS server netif */
    netif_set_up(&pppos_server_netif);
    
    /* Authenticate PPPoS server */
    ppp_set_auth(PPP_SERVER_USERNAME, PPP_SERVER_PASSWORD);
    
    /* Wait forever */
    for (;;)
    {
        vTaskDelay(portMAX_DELAY);
    }
}

/* Application entry point */
int main(void)
{
    /* Initialize lwIP */
    tcpip_init(NULL, NULL);
    
    /* Create PPPoS server task */
    xTaskCreate(pppos_server_task, "pppos_server", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY + 1, NULL);
    
    /* Start FreeRTOS scheduler */
    vTaskStartScheduler();
    
    /* Should never get here */
    return 0;
}

请注意，此处的示例代码仅用于参考。实际运行时，您需要根据自己的需求和硬件平台进行适当的修改。