This might be an alignment issue. What is the values of R0 and SP when this happens? LDR arguments must be 4-byte aligned.
Kjetil Østerås
Den fredag 12. juni 2015 skrev Xun Chen <
address@hidden> følgende:
More on the configuration:
1) No RTOS
2) 80000KB heap
A few more faults generated, always the same place inside tcp_output
It seems the image were dropped.
So I am going to add some text to it.
Hi there,
I am using TI's TiVa (TM4C1294) for a TCP-based project
The code is developed on CCS, and the TiVaware contains lwip 1.4.1.
I got my codes working (sort of), pumping out data acquired from SSI
port (via ISR) to TCP port at around 200kb/sec.
After hours running, it ran into a hard fault, with NVIC_FAULT_STAT_IMPRE
flag, which means Imprecise Data Bus Error
<This screen capture is not so important to lwip community since it only deal with TiVa status>
Then I began to study the stack to see what caused this fault, here is
the SP pointer and the memory dump of the stack
<This screen capture is not so important to lwip community since it is only a memory dump that leads to the next section>
>From there, I can track down the last instruction before the hardfault
The fault is inside tcp_output.c, around the highlighted area.
Here are the codes inside tcp_output.c
----------------------------------------
tcp_output(struct tcp_pcb *pcb)
{
...........
if (TCP_TCPLEN(seg) > 0) {
seg->next = NULL;
/* unacked list is empty? */
if (pcb->unacked == NULL) {
pcb->unacked = seg;
useg = seg;
/* unacked list is not empty? */
} else {
/* In the case of fast retransmit, the packet should not go to the tail
* of the unacked queue, but rather somewhere before it. We need to check for
* this case. -STJ Jul 27, 2004 */
if (TCP_SEQ_LT(ntohl(seg->tcphdr->seqno), ntohl(useg->tcphdr->seqno))) {
/* add segment to before tail of unacked list, keeping the list sorted */
struct tcp_seg **cur_seg = &(pcb->unacked);
while (*cur_seg &&
TCP_SEQ_LT(ntohl((*cur_seg)->tcphdr->seqno), ntohl(seg->tcphdr->seqno))) {
cur_seg = &((*cur_seg)->next );
}
seg->next = (*cur_seg);
(*cur_seg) = seg; <<<<<<<<<<<<<<< hardfault around here
} else {
/* add segment to tail of unacked list */
useg->next = seg;
useg = useg->next;
}
}
/* do not queue empty segments on the unacked list */
} else {
tcp_seg_free(seg);
}
seg = pcb->unsent;
........
}
---------------------------------------
(*cur_seg) = seg; <<<<<<<<<<<<<<< hardfault around here
Does any one have suggestion on what I should trace next? Or is there a
known bug in lwip around this area?
Thanks!
On 6/12/2015 1:18 PM, address@hidden wrote:
----------------------------------------------------------------------
Hi there,
I am using TI's TiVa (TM4C1294) for a TCP-based project
The code is developed on CCS, and the TiVaware contains lwip 1.4.1.
I got my codes working (sort of), pumping out data acquired from SSI
port (via ISR) to TCP port at around 200kb/sec.
Once hours running, it ran into a hard fault, with NVIC_FAULT_STAT_IMPRE
flag, which means Imprecise Data Bus Error
Then I began to study the stack to see what caused this fault, here is
the SP pointer and the memory dump of the stack
From there, I can track down the last instruction before the hardfault
The fault is inside tcp_output.c, around the highlighted area.
Does any one have suggestion on what I should trace next? Or is this a
known bug in lwip?
Thanks!
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