RE: [lwip-users] lwIP API without OS

Nishen Naidu Thu, 10 Aug 2006 03:16:06 -0700

Make sure you define NO_SYS in your lwip opts file and use the raw api.

basically you have to implement the functions like

netio_recv,netio_accept,netio_init

SYS_MBOX_NULL should be defined to NULL

example implementation:

static err_t netio_accept(void *arg, struct tcp_pcb *pcb, err_t err)
{

            tcp_arg(pcb, NULL);
           tcp_sent(pcb, NULL);
            tcp_recv(pcb, netio_recv);
           return ERR_OK;
}

void netio_init(void)
{
struct tcp_pcb *pcb;

pcb = tcp_new();
tcp_bind(pcb, IP_ADDR_ANY, 1000);
pcb = tcp_listen(pcb);
tcp_accept(pcb, netio_accept);
}

static err_t netio_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
{

struct pbuf* ptr;

int pktlen = 0;

if (err == ERR_OK && p != NULL)
{
  tcp_recved(pcb, p->tot_len);
  //just echo the same string

  //pkt received..
//do something with your pkt
  if (ptr!=NULL)
  {

err = tcp_write(pcb, ptr->payload, pktlen, 0);
}

//send the packet back out again using tcp_write

pbuf_free(p);

pbuf_free(ptr);

}
else
pbuf_free(p);

if (err == ERR_OK && p == NULL)
{
//check if we come here..
// free the connection number
  tcp_arg(pcb, NULL);
  tcp_sent(pcb, NULL);
  tcp_recv(pcb, NULL);
  tcp_close(pcb);

}

return ERR_OK;
}

Nishen

www.punky.co.za

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of Mauricio brazuka
Sent: 10 August 2006 10:23
To: [email protected]
Subject: [lwip-users] lwIP API without OS

Hi everybody,

i am using Nios II 5.0 IDE and i try to create one project with the NIOS using the lwIP as Standalone.
Is it possible to use the lwIP 0.7.1 without an operating system running with the NIOS II?
I use the Linux as development platform and i tried to run the example "unixsim/simhost" from lwIP together with the NIOS but dont works.
I thought the lwIP (api_lib.c) can provide the emulation of the operating system, but i dont understand why can I define the architecture (sys_arch.c, sys_arch.h) to my Hardware(NIOSII). I need really to do this?
I am getting error "SYS_MBOX_NULL undefined" when i try to compile with the Nios IDE. Under Linux the unixsim run ok.

Can someone help me please?

Thanks a lot
Mauricio

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