Re: [lwip-users] LWIP client code causes hard fault error

[Sanchayan]

Hello,

Yes, i did get such faults. To trace the cause of a hard fault, refer to 
the Technical Reference Manual.

Here is a link for some help. 
http://coherentmusings.wordpress.com/2012/06/11/debugging-a-hard-fault-in-arm-cortex-m3s/

I use to get a bus fault generally once in a few hours or so. But, my 
problem started occurring  after i incorporated firmware update over 
Ethernet functionality in my code. I had no problems with sending or 
receiving data. I wrote a bus fault handler in which i do a software 
reset of the system.


On 26-06-2012 17:14, shettys wrote:
> Yes i am using the arm cortex m3. Did you have such problems ?
>
>
> Sanchayan wrote:
> > Hello,
> >
> > Which processor are you using?
> >
> > Are you using ARM Cortex M3?
> >
> >
> > On 26-06-2012 16:23, shettys wrote:
> > > Hello,
> > >
> > > Could somebody please help me with my problem in setting up a TCP client.
> > > The code is as posted below.
> > > I call the TCPConnection_start before i go into the main loop, which
> > > initializes the connection. Then i call the TCP_send periodically( to
> > > send
> > > some ADC values).
> > > When my server opens a connection on Port 7 and I run my program it works
> > > fine and the ADC values are sent. However sometimes it just goes into a
> > > hard
> > > fault handler. Could someone please let me know where i am wrong?
> > >
> > > void TCPConnection_start(void)
> > > {
> > >     struct ip_addr DestIPaddr;
> > >    
> > >     /* create new tcp pcb */
> > >     pcb = tcp_new();
> > >     if (pcb != NULL)
> > >     {
> > >       IP4_ADDR( &DestIPaddr, DEST_IP_ADDR0, DEST_IP_ADDR1, DEST_IP_ADDR2,
> > > DEST_IP_ADDR3 );
> > >          
> > >       /* connect to destination address/port */
> > >       tcp_connect(pcb,&DestIPaddr,DEST_PORT,TCPConnection_Established);
> > >     }
> > > }
> > >
> > > /**
> > >     * @brief Function called when TCP connection established
> > >     * @param tpcb: pointer on the connection contol block
> > >     * @param err: when connection correctly established err should be
> > > ERR_OK
> > >     * @retval err_t: returned error
> > >     */
> > > static err_t TCPConnection_Established(void *arg, struct tcp_pcb *pcb,
> > > err_t
> > > err)
> > > {
> > >     if (err == ERR_OK)
> > >     {
> > >     /* allocate structure es to maintain tcp connection informations */
> > >       es = (struct echoclient *)mem_malloc(sizeof(struct echoclient));
> > >     
> > >       if (es != NULL)
> > >       {
> > >           es->state = ES_CONNECTED;
> > >         es->pcb = pcb;
> > >          }
> > >      }
> > > }
> > >
> > >
> > > void TCP_send(void)
> > > {
> > >         uint32_t (*ptr)[3]; // pointer to the   ADC_TDstamped_SRAM array.
> > >         #ifdef UserButton_InteruptFor_ADCConversion
> > >         sprintf((char*)data, "Potentiometer value is, %d\n",
> > > ADC3ConvertedValue);
> > >
> > >         /* allocate pbuf */
> > >         es->p_tx = pbuf_alloc(PBUF_TRANSPORT, strlen((char*)data) ,
> > > PBUF_POOL);
> > >            
> > >         if (es->p_tx)
> > >         {
> > >        
> > > 	    /* copy data to pbuf */
> > >           pbuf_take(es->p_tx, (char*)data, strlen((char*)data));
> > >           
> > >           /* send data */
> > >                 TCPData_send(pcb,es);
> > >         }
> > > }
> > >
> > >     
> > > /**
> > >     * @brief function used to send data
> > >     * @param  tpcb: tcp control block
> > >     * @param  es: pointer on structure of type echoclient containing info
> > > on
> > > data
> > >     *             to be sent
> > >     * @retval None
> > >     */
> > > static void TCPData_send(struct tcp_pcb *pcb, struct echoclient * es)
> > > {
> > >     struct pbuf *ptr;
> > >     err_t wr_err = ERR_OK;
> > >    
> > >     while ((wr_err == ERR_OK) &&
> > >            (es->p_tx != NULL) &&
> > >            (es->p_tx->len <= tcp_sndbuf(pcb)))
> > >     {
> > >       
> > >       /* get pointer on pbuf from es structure */
> > >       ptr = es->p_tx;
> > >
> > >       /* enqueue data for transmission */
> > >       wr_err = tcp_write(pcb, ptr->payload, ptr->len, 1);
> > >       
> > >       if (wr_err == ERR_OK)
> > >       {
> > >         /* continue with next pbuf in chain (if any) */
> > >         es->p_tx = ptr->next;
> > >         
> > >         if(es->p_tx != NULL)
> > >         {
> > >           /* increment reference count for es->p */
> > >           pbuf_ref(es->p_tx);
> > >         }
> > >         
> > >         /* free pbuf: will free pbufs up to es->p (because es->p has a
> > > reference count > 0) */
> > >         pbuf_free(ptr);
> > >      }
> > >      else if(wr_err == ERR_MEM)
> > >      {
> > >         /* we are low on memory, try later, defer to poll */
> > >        es->p_tx = ptr;
> > >      }
> > >      else
> > >      {
> > >       }
> > >     }
> > > }
> >
> >
> >
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