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

[shettys]

Thanks for this sanchayan. went through this article but cannot pin point
where the fault lies

Sanchayan wrote:
> 
> 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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> 
> 
> 
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