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[FreeRTOS Home] [Live FreeRTOS Forum] [FAQ] [Archive Top] [April 2009 Threads] Start lwIP UDP in a TaskPosted by Mathias Zenger on April 16, 2009 Hi,
I've been trying for hours to run a simple UDP example from the lwIP documentation in a FreeRTOS task.
My application does not return from the method call netconn_connect(). Although it is likely to be a lwIP problem I am not sure if I can use the netconn/netbuf methods in FreeRTOS.
Does anybody have experience with this? Is there an example available which also uses netconn_recv()?
The task function looks as follows:
portTASK_FUNCTION(vNTPClient, pvParameters) { struct netconn *conn; struct netbuf *buf; struct ip_addr addr; char *data; char text[] = "A static text"; int i;
portTickType xLastWakeTime; // Initialize with current tick count xLastWakeTime = xTaskGetTickCount();
// Task loop for (;;) { // Check if interface is ready if (netif_is_up(&MACB_if)) { /* create a new connection */ conn = netconn_new(NETCONN_UDP); /* set up the IP address of the remote host */ addr.addr = htonl(0x0a000001); /* connect the connection to the remote host */ netconn_connect(conn, &addr, 7000); /* create a new netbuf */ buf = netbuf_new(); data = netbuf_alloc(buf, 10); /* create some arbitrary data */ for(i = 0; i < 10; i++) data = i; /* send the arbitrary data */ netconn_send(conn, buf); /* reference the text into the netbuf */ netbuf_ref(buf, text, sizeof(text)); /* send the text */ netconn_send(conn, buf); /* deallocate connection and netbuf */ netconn_delete(conn); netbuf_delete(buf); } else { print_dbg("Waiting for IP...\n"); } // Delay the task vTaskDelayUntil(&xLastWakeTime, ntpclientTICK_RATE); } }
Thanks for your help. Regards, Mathias
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