[lwip-users] Re: Resolving- sending data from spartan3 to another (David Empson & all)

[devesh]

Hi,

Thanks for the tricks!

I have resolved my half of the problem of data sending and receiving.
Now I can send at most 1024bytes at a time and can exactly what i
sent. :) Now the code is like:

static err_t client_connected(void *arg, struct tcp_pcb *pcb, err_t err)
{
        char LWIP_UNUSED_ARG(arg);
        int i;
        char test[n+1];
        for(i=0;i<n;i++)
        {
        test[i]='1';
        }
        test[n-9]='A';
        test[n]='\0';
        xil_printf("The test is %s \n\r",test);
   if (err != ERR_OK)

printf("\nclient_connected(): err argument not set to ERR_OK, but is
value is %d\n", err);

   else
   {
       tcp_sent(pcb, client_sent);
      // tcp_write(pcb, string, strlen(string), 0);
       tcp_write(pcb, test, n, 1);
   }

   return err;
}

Now a litlle prob is :- how to send data more than 1024bytes.? andTCP_SND_BUF ?
Here is my lwipopts.h ;
/////////////////////////////

#define MEM_ALIGNMENT 8
#define MEM_SIZE 131072
#define MEMP_NUM_PBUF 16
#define MEMP_NUM_UDP_PCB 4
#define MEMP_NUM_TCP_PCB 32
#define MEMP_NUM_TCP_PCB_LISTEN 8
#define MEMP_NUM_TCP_SEG 256
#define MEM_LIBC_MALLOC 1

#define MEMP_NUM_SYS_TIMEOUT 8
#define PBUF_POOL_SIZE 256
#define PBUF_POOL_BUFSIZE 1600
#define PBUF_LINK_HLEN 16

#define ARP_TABLE_SIZE 10
#define ARP_QUEUEING 1

#define ICMP_TTL 255

#define IP_OPTIONS 0
#define IP_FORWARD 0
#define IP_REASSEMBLY 1
#define IP_FRAG 1
#define IP_REASS_BUFSIZE 5760
#define IP_FRAG_MAX_MTU 1500
#define IP_DEFAULT_TTL 255

#define LWIP_UDP 1
#define UDP_TTL 255

#define LWIP_TCP 1
#define TCP_SND_QUEUELEN   16 * TCP_SND_BUF/TCP_MSS
#define TCP_MSS 1460
#define TCP_SND_BUF 8192
#define TCP_WND 2048
#define TCP_TTL 255
#define TCP_MAXRTX 12
#define TCP_SYNMAXRTX 4
#define TCP_QUEUE_OOSEQ 1
#define CHECKSUM_GEN_TCP 1
#define CHECKSUM_CHECK_TCP 1

#define LWIP_DHCP 0
#define DHCP_DOES_ARP_CHECK true

#define CONFIG_LINKSPEED_AUTODETECT 1

#endif
////////////////////////////


Here #define TCP_SND_BUF 8192
then why only 1024?
Anyways, can I put " tcp_write(pcb, test, n, 1);" in loop, but
conncetion gets closed after sending 1024.

Regards,
devesh