Posted on December 14, 2011 at 20:12 !!!SOLVED!!!
The problem is in PHY or PERIPHERAL hw. If you send to unit a fragmented packed (for example by sending ping with arg -l 1473) then packets are bufferd inside hardware. The IRQ is called, but only once, which result is reading out only the first fragment, the second one keeps remaining in hw. After that if you send to unit an another packet, lets say third packet, the IRQ is called but the second (half of fragmented) packet is readed out and the third remains in hardware. This repeats until reset. The result is as described in first post.
So to repair this issue you have to modify functionethernetif_input andlow_level_input only (blue backround means code changes from origin):
void
ethernetif_input(
void
* pvParameters) {
struct
pbuf *p;
for
(;;) {
if
(xSemaphoreTake( s_xSemaphore, emacBLOCK_TIME_WAITING_FOR_INPUT) == pdTRUE) {
TRY_GET_NEXT_FRAGMENT:
p = low_level_input(s_pxNetIf);
if
(p != NULL) {
if
(ERR_OK != s_pxNetIf->input(p, s_pxNetIf)) {
pbuf_free(p);
p = NULL;
}
else
{
xSemaphoreTake( s_xSemaphore, 0);
goto
TRY_GET_NEXT_FRAGMENT;
}
}
else
{
//PHY buffer is empty, continue to wait for ISR
}
}
}
}
static
struct
pbuf * low_level_input(
struct
netif *netif) {
struct
pbuf *p, *q;
u16_t len;
uint32_t l = 0, i = 0;
FrameTypeDef frame;
u8 *buffer;
__IO ETH_DMADESCTypeDef *DMARxNextDesc;
p = NULL;
/* Get received frame */
frame = ETH_Get_Received_Frame_interrupt();
/* Check if really we have something or not */
if
(frame.descriptor==NULL)
return
p;
/* check that frame has no error */
if
((frame.descriptor->Status & ETH_DMARxDesc_ES) == (uint32_t) RESET) {
/* Obtain the size of the packet and put it into the ''len'' variable. */
len = frame.length;
buffer = (u8 *) frame.buffer;
/* We allocate a pbuf chain of pbufs from the pool. */
p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
/* Copy received frame from eth....and so on the code under that text remains untouched
Regards,
Tomas Kamenicky
