Re: [lwip-users] Are UDP packets received at tcpip stack in lwip1.3.2 +safeRTOS

[Jin Won Seo]

Hi Marty,

Thanks for your answer.

Regardless of 1.4 or 1.3.2 udp_input() is called from ip_input().

My question is a bit different from your answer since safeRTOS is being used in my  case. Without safeRTOS, yes you are right.

As I mentioned in the first post, tcpip_init(lwIPPrivateInit, 0) in lwiplib.c of StellarisWare as safeRTOS is used, then call tcpip_thread() in tcpip.c.

Inside of tcpip_thread() there is switch (msg->type) to distinguish message type both 1.4 and 1.3.2

Either ethernet_input() or ip_input actually end up calling udp_input(), but the thing is mes->type should be TCPIP_MSG_INPKT in order to get into case clause and call either ethernet_input() or ip_input() otherwise those functions are not called.

This codes seem like only accepting tcpip message not udp since I don't see an udp message type something like TCPIP_MSG_INPKT filtered by swithch~case to call either ethernet_input() or ip_input().

I am not sure this is clear for you regarding my question.

Thanks,
Jin

On Fri, Jul 26, 2013 at 3:54 AM, Pomeroy, Marty <address@hidden> wrote:

Jin

 

I have 1.4.0 and this is how it works there:

 

Make sure you have LWIP_UDP set to 1 in lwipopts.h.  Then udp_input() is called from ip_input() if it is a UDP packet type.

 

Hope that helps!

 

Marty

---

From: lwip-users-bounces+martypomeroy=address@hidden [mailto:lwip-users-bounces+martypomeroy=address@hidden] On Behalf Of Jin Won Seo
Sent: Tuesday, July 23, 2013 3:47 PM
To: Mailing list for lwIP users
Subject: [lwip-users] Are UDP packets received at tcpip stack in lwip1.3.2 +safeRTOS

Hi all,

My project uses StellarisWare+lwip1.3.2+BOOTP+TFTP.

Now I am analyzing lwip1.3.2 codes and if RTOS is used then call tcpip_init(lwIPPrivateInit, 0) in lwiplib.c.

Then tcpip_thread() is called in tcpip.c

Depending on received message's type either ethernet_input() or ip_input() are executed.

sys_mbox_fetch(mbox, (void *)&msg);

    switch (msg->type) {
case TCPIP_MSG_INPKT:
      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: PACKET %p\n", (void *)msg));
#if LWIP_ARP
      if (msg->msg.inp.netif->flags & NETIF_FLAG_ETHARP) {
        ethernet_input(msg->msg.inp.p, msg->msg.inp.netif);
      } else
#endif /* LWIP_ARP */
      {
        ip_input(msg->msg.inp.p, msg->msg.inp.netif);
      }
      memp_free(MEMP_TCPIP_MSG_INPKT, msg);
      break;

case TCPIP_MSG_CALLBACK:
......
......
}

I am not sure once UDP packets are received, they get through this codes. safeRtos seems like only binding tcpip stack, so I am now tracing lwip codes to see if UDP packets can be received from tcpip_init(lwiPPrivateInit,0) in lwip+safeRTOS.

I know UDP and TCP/IP are different, but I don't how I can receive UDP packets using lwip+safeRTOS.

Thanks,
Jin

_______________________________________________
lwip-users mailing list
address@hidden
https://lists.nongnu.org/mailman/listinfo/lwip-users