Re: [lwip-users] LWIP on LPC1788 uEZ 2.1

[Dinesh Pandey]

The code looks odd. Why would you put tcp_listen and tcp_accept in an infinite loop?

The call sequence should be (for 1.4.1)

tcp_bind

tcp_listen

tcp_accept

while(1)
{
    ethernetif_input     // Look for incoming packets.
    sys_check_timeouts // TCP timers.
}

On Wed, Oct 21, 2015 at 2:54 PM, enricoG <address@hidden> wrote:

Hi, I've a big problem with echo example running in my LPC1788
(DK-57VTS-LPC1788 FDI). I'm using uEZ 2.1 framework and this is my code
(taken here: http://www.ultimaserial.com/avr_lwip_tcp.html) :


#include <sockets.h>
#include <tcp.h>
#include <uEZ.h>
#include <http.h>
#include <init.h>
#include <lwip/ip_addr.h>
#include "lwip/sys.h"
#include "lwip/api.h"

char mydata[1024];
static struct tcp_pcb *ptel_pcb;
int err;


#include "lwip/debug.h"
#include "lwip/stats.h"
#include "lwip/tcp.h"


static struct tcp_pcb *echo_pcb;

enum echo_states
{
  ES_NONE = 0,
  ES_ACCEPTED,
  ES_RECEIVED,
  ES_CLOSING
};

struct echo_state
{
  u8_t state;
  u8_t retries;
  struct tcp_pcb *pcb;
  /* pbuf (chain) to recycle */
  struct pbuf *p;
};

struct ip_addr  ipaddr_local;
struct ip_addr  ipmask_local;

/*
                IP4_ADDR(&ipaddr_local, 192,168,1,3);
                IP4_ADDR(&ipmask_local, 255,255,255,0);

    err = tcp_bind(echo_pcb, &ipaddr_local, 7);

*/


err_t echo_accept(void *arg, struct tcp_pcb *newpcb, err_t err);
err_t echo_recv(void *arg, struct tcp_pcb *tpcb, struct pbuf *p, err_t err);
void echo_error(void *arg, err_t err);
err_t echo_poll(void *arg, struct tcp_pcb *tpcb);
err_t echo_sent(void *arg, struct tcp_pcb *tpcb, u16_t len);
void echo_send(struct tcp_pcb *tpcb, struct echo_state *es);
void echo_close(struct tcp_pcb *tpcb, struct echo_state *es);

static void close_conn(struct tcp_pcb *pcb){
      tcp_arg(pcb, NULL);
      tcp_sent(pcb, NULL);
      tcp_recv(pcb, NULL);
      tcp_close(pcb);
}

static err_t echo_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t
err){
      int i;
      int len;
      char *pc;

      if (err == ERR_OK && p != NULL) {
            /* Inform TCP that we have taken the data. */
            tcp_recved(pcb, p->tot_len);

            //pointer to the pay load
            pc=(char *)p->payload;

            //size of the pay load
            len =p->tot_len;

            //copy to our own buffer
            for (i=0; i<len; i++)mydata[i]= pc[i];

             //Close TCP when receiving &quot;X&quot;
            if (mydata[0]=='X')close_conn(pcb);

           //Free the packet buffer
            pbuf_free(p);

            //check output buffer capacity
            if (len >tcp_sndbuf(pcb)) len= tcp_sndbuf(pcb);
            //Send out the data
            err = tcp_write(pcb, mydata, len, 0);
            tcp_sent(pcb, NULL); /* No need to call back */
      } else {
            pbuf_free(p);
      }

      if (err == ERR_OK && p == NULL) {
            close_conn(pcb);
      }
      return ERR_OK;
}

static err_t echo_accept(void *arg, struct tcp_pcb *pcb, err_t err){
        LWIP_UNUSED_ARG(arg);
        LWIP_UNUSED_ARG(err);
        tcp_setprio(pcb, TCP_PRIO_MIN);
        tcp_recv(pcb, echo_recv);
        tcp_err(pcb, NULL); //Don't care about error here
        tcp_poll(pcb, NULL, 4); //No polling here
        return ERR_OK;
}


unsigned int _ServerTask(T_uezTask aMyTask, void *aParameters){
        struct tcp_pcb *ptel_pcb;
        ptel_pcb = tcp_new();
        IP4_ADDR(&ipaddr_local, 192,168,1,3);
        IP4_ADDR(&ipmask_local, 255,255,255,0);

        err = tcp_bind(echo_pcb, &ipaddr_local, 7);

        while (1){
                                ptel_pcb = tcp_listen(ptel_pcb);
                                tcp_accept(ptel_pcb, echo_accept);
        }
}


void server_setup(){
        T_uezTask      server_task;
        lwip_init();

        if (!(UEZTaskCreate((T_uezTaskFunction)_ServerTask, "ServerTask",  4096, 0,
UEZ_PRIORITY_LOW, &server_task) == UEZ_ERROR_NONE)) {
                printf("ERROR\n");
        }
}


What is wrong? Does exists a simple example test running on uEZ or
externally?



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