[lwip-users] lwip socket + safeRTOS based on safertos_demo

[Jin Won Seo]

Hi,

I am now testing lwip-socket by modifying safertos_demo example. My development environments are LM3S9B96, StellarisWare 10636, ccs 5.4.x, lwip-1.3.2, f=80Mhz

TCP Listener task is implemented to communicate with Unix server(using lwip-socket) and this listener task runs concurrently with other tasks used in safertos_demo example : led_task, idle_task, lwip_task, and display_task(spider and web server modules are not used).

1. setup tcp ip socket service.

   //
    // Setup the remaining services inside the TCP/IP thread's context.
    //
    tcpip_callback(SetupServices, 0);

2. Initialize lwip-socket in SetupServices()

   lwip_socket_init();

3. Make cmdListnerTaskInit() in cmdListener_task

   if(xTaskCreate(cmdListenerTask, (signed portCHAR *)"TCP_LISTENER",
                   (signed portCHAR *)g_pulcmdListenerTaskStack,
                   sizeof(g_pulcmdListenerTaskStack), NULL, PRIORITY_CMDLISTENER_TASK,
                   NULL) != pdPASS)
    {
        return(1);
    }
    
    TaskCreated();

4. Make main task function, cmdListenerTask(void *pvParameters)

    // Setup the local address.
    memset((char *) &sClient, 0, sizeof(sClient));
    sClient.sin_family = AF_INET;
    sClient.sin_len = sizeof(sClient);
    sClient.sin_addr.s_addr = lwIPLocalIPAddrGet();
    sClient.sin_port = htons(sPort);

    //setup the destination address
    memset((char *) &sDestAddr, 0, sizeof(sDestAddr));
    sDestAddr.sin_family = AF_INET;
    sDestAddr.sin_len = sizeof(sDestAddr);
    sDestAddr.sin_addr.s_addr = inet_addr("192.2.0.3");// for test, hard-corded
    sDestAddr.sin_port = htons(sPort);


    while(1)
    {
        while((socket_fd = lwip_socket(AF_INET, SOCK_DGRAM, 0)) == 0)
        {
            xTaskDelay(CHGD_OPEN_TIME);
        }

        //bind socket to the local address and port
        lwip_bind(socket_fd, (struct sockaddr *) &sClient, sizeof(sClient));

        //receive from server
        length = lwip_recvfrom(socket_fd, (char *) msg_buf, sizeof(msg_buf),
                MSG_DONTWAIT, (struct sockaddr *)&sDestAddr, &size);

        if(length > 0)
        {
            sMsg = (NET_MSG *) (msg_buf);
            mon_cmd_do(socket_fd, &sDestAddr, sMsg, length);
        }
        lwip_close(socket_fd);

    }

5. call cmdListnerTaskInit() in main()

The scenario is as lwip_task is running, the client IP is assigned from server(DHCP) and bind lwip-socket with the given IP, so I LWIP_DHCP and LWIP_SOCKET are defined in lwipopts.h.

Ths priority of each task is led_task= 3, cmd Listener_task =1, display_task=2

As I test this:

1. led_task keeps flashing

2. IP is sent to the client but it doesn't display(Wireshark tells IP was sent to client from server)

3. Idle_task seems like not working. That's why running time and RX packet don't show up on LED.

4. If cmd Listener task is suspended, other tasks work fine.(using xTaskSuspend()).

So far I don't see any clues to figure this out. Whenever I try to debug, the safeRTOS scheduler shows me "Failed to start scheduler", so I don't know how possibly to look inside.

What do I make a mistake?

Regards,

Jin