- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Dear all !
I have downloaded stand-alone lwip from our forum "Test IP" .My design is to build a simple udp-client that sending data to PC with stand-alone lwip .But this version seems too old (version 0.7.1,developped on 2005 ,now the lastest version is 1.3.0)I guess MAYBE there is a bug in ARP modle ,here is the problem i hit: If i run my application, it does not send any UDP packets ( see that in Ethereal ). However ,after runing anther application udp_echo (data send and return ) ,stop it and run my application ,my app runs very well .I 'm very confused ! So i guess MAYBE there is a bug in our stand-alone lwip .Here is my reason. when i run the UDP_ECHO app, PC send a udp packet to board ,so our board konw the IP address and MAC addess of PC ,and update it to ARP cache . Then run my app ,the app konws the destination host ' IP address and MAC addess (PC),so it works well. If i run my app only ,it does not konw the PC 's MAC addess , therefore it work fail.Though PC send gratuitous arps ,but the lwip can't update it to the ARP cache . Am i right ? And how to resolve it ? Is there someone work similar with me ? or could send a simple udp-client example (stand-alone lwip version) to me ! Thank you ! My MSN and my email is the_gadfly@163.com ----------my app------------- ... ... P4_ADDR(&udpDestIpAddr, 10, 1 ,1, 52); p = pbuf_alloc(PBUF_TRANSPORT,sizeof(Test),PBUF_RAM); memcpy(p->payload, Test, sizeof(Test)); pcb = udp_new(); udp_bind(pcb, IP_ADDR_ANY, 60000); udp_connect(pcb, &udpDestIpAddr, 60000); for(i=0;i<1000;i++) { udp_send(pcb,p); } pbuf_free(p); udp_remove(pcb); --------udp_echo app------------ void udp_echo_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr, u16_t port) { struct ip_addr ipaddr; IP4_ADDR(&ipaddr,10,1,1,52); if (p != NULL) { udp_connect(pcb,&ipaddr,60000); udp_send(pcb, p); pbuf_free(p); } } void udp_echo_init(void) { struct udp_pcb * pcb; pcb = udp_new(); udp_bind(pcb, IP_ADDR_ANY, 60000) ; udp_recv(pcb, udp_echo_recv, NULL); } ------------------------------------------- Best regards the_gadflyLink Copied
1 Reply
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hi,
I too want to implement the lwip with DE2-115 FPGA , But I am facing difficulty in spoc builder component connections.As I am new Altera I tried with basic Ethernet design based on below link.
When I adding these component and additional peripheral as suggest in message , I unable connect these.
I am confuse what should the component, its value and how to connect with others.Please guide little

Reply
Topic Options
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page