Hi ankish sharma,
Thanks for your reply.
Whether the demo code pause at the breakpoint when the TCP/IP layer handles the time-out ACK event with retransmitting the segment, in trace data, as I can't find the record when the server transmits this segment data (Seq: 6185~6444).
Have a great day,
TIC
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Hi I am using Lauterbach script for debugging the firmware
It is a Modbus server communicating with a Modbus client at 100mbs ethernet link with lwip stack in it.
It works fine for couple of hours but then it shows me random delays of approximately an 1 sec which causes the Modbus client to retransmit the data
I am not getting any trace of packet drop even after debugging the lwip stack for sometime so i suspected it to be a emac driver issue so i put a break point in the ethernet port form the Lwip demo in the LPCOpen library ethernet IRQ function where it gets the tx underun interrupt.
I have attached the Wireshark trace for the mentioned delay as well 192.168.72.1 is my Modbus client and 192.168.72.231 is my lpc 1768 Modbus server with lwip stack for tcp/ip communication.
{
#if NO_SYS == 1
/* Interrupts are not used without an RTOS */
NVIC_DisableIRQ(ETHERNET_IRQn);
#else
signed portBASE_TYPE xRecTaskWoken = pdFALSE, XTXTaskWoken = pdFALSE;
uint32_t ints;
interrupt, kick off the receive or transmit (cleanup) task */
ints = Chip_ENET_GetIntStatus(LPC_ETHERNET);
/* RX group interrupt(s) */
/* Give semaphore to wakeup RX receive task. Note the FreeRTOS
method is used instead of the LWIP arch method. */
int_rx_cnt++;
xSemaphoreGiveFromISR(lpc_enetdata.rx_sem, &xRecTaskWoken);
}
if (ints & (ENET_INT_TXUNDERRUN | ENET_INT_TXERROR))
tx_error++;
/* TX group interrupt(s) */
/* Give semaphore to wakeup TX cleanup task. Note the FreeRTOS
method is used instead of the LWIP arch method. */
int_tx_cnt++;
xSemaphoreGiveFromISR(lpc_enetdata.tx_clean_sem, &XTXTaskWoken);
}
Chip_ENET_ClearIntStatus(LPC_ETHERNET, ints);
portEND_SWITCHING_ISR(xRecTaskWoken || XTXTaskWoken);
#endif
}
Hi ankish sharma,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
The underrun error would happen by these causes, just according to your description, it's hard to say which cause you may encounter.
So I'd like to suggest you do more test to find the exact cause, in further, LPCOpen library has provided the Lwip demo, you can refer to it for details.
LPCOpen Software for LPC17XX | NXP
Have a great day,
TIC
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