problem of udp send

hi :

I am a newbie to nios and i want to use stand-alone lwip stack to transport data form my board (stratix ii ) to PC.

My design is modified from a stand-alone lwip example lwip-web server.

When i run the code ,it did not send any udp message at all ,all it sent are ARPs:the board and PC all ask who has 10.1.1.52(pc itself's ip address),but PC did not answerd. I 've searched this forum ,however ,no post can help me to resove this problem

Here is my code ,could anyone tell me what's wrong?

Best Regards

the_gadfly

-------------------------------------------------------------------------# include "system.h"# include "arch/init.h"# include "lwip/ip_addr.h"# include "lwip/tcpip.h"# include "lwip/netif.h"# include "netif/lan91c111if.h"# include "sys/alt_alarm.h"

/* ---------- IP oriented addresses for ethernet adapter ---------- */# define IPADDR0 10 # define IPADDR1 1# define IPADDR2 1# define IPADDR3 51

# define NETMASK0 255# define NETMASK1 255# define NETMASK2 255# define NETMASK3 0

# define GWADDR0 10# define GWADDR1 1# define GWADDR2 1# define GWADDR3 2

int main(void)

{

//0.6.4 struct netif *netif;

struct netif netif;

struct ip_addr ipaddr, netmask, gw;

struct ip_addr udpDestIpAddr;

struct pbuf *p;

struct udp_pcb *pcb;

err_t err;

char Test[]="hello world !";

int i=0;

alt_avalon_lan91c111_if* dev_list_ptr = (alt_avalon_lan91c111_if*)alt_ethernet_device_list.next;

printf("UDP-server using Light-weight IP (LWIP)\n\n");

/* Initialize lwip */

lwip_init();

printf ("Setting IP address to: %d.%d.%d.%d\n", IPADDR0, IPADDR1, IPADDR2, IPADDR3);

printf ("Setting netmask to: %d.%d.%d.%d\n", NETMASK0, NETMASK1, NETMASK2, NETMASK3);

printf ("Setting gateway address to: %d.%d.%d.%d\n\n\n", GWADDR0, GWADDR1, GWADDR2, GWADDR3);

IP4_ADDR(&ipaddr, IPADDR0, IPADDR1, IPADDR2, IPADDR3);

IP4_ADDR(&netmask, NETMASK0, NETMASK1, NETMASK2, NETMASK3);

IP4_ADDR(&gw, GWADDR0, GWADDR1, GWADDR2, GWADDR3);

//0.6.4 netif = netif_add(&ipaddr, &netmask, &gw,

netif_add(&netif, &ipaddr, &netmask, &gw,(void*)dev_list_ptr,lan91c111if_init, ip_input);

//0.6.4 netif_set_default(&netif);

netif_set_default(&netif);

IP4_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);

err=udp_send(pcb,p);

if(err==ERR_OK)

{printf("send ok !\n");}

pbuf_free(p);

udp_remove(pcb);

while(1)

{

//0.6.4 lan91c111if_service(netif);

lan91c111if_service(&netif);

}

}

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