Hi, Any update on my query...
Regards, PraveenKumar. On Thu, 13 Feb 2020, 09:54 praveenkumar raavi, <raavipraveenku...@gmail.com> wrote: > Hi Everyone, > > > > we are using LWIP 2.0.3 for one of our project to establish the TCP > connection from ECU and Atmel micro. > We got the LWIP from Atmel itself and I have modified little to support > VLAN data receive and transmit. > > > > But now we are seeing some issue during data transmission. > When the ECU goes to sleep, it cut down the Ethernet link and when it > wakes up it will establish the Ethernet connection. > But here when the ECU wakes up the communication is not going well from > our LWIP stack. We are seeing multiple re transmissions which are causing > issues in data transmission. > > So we planned to reinitialize the LWIP stack after ECU goes to sleep. > But when I do shut down the connection, the connection is not closing as > there is no FIN request response from ECU and its getting stuck in tcp_slow > timer. > Also I have seen new behavior like when i received new frame on TCP, I am > trying to ACK back using ACK now function(pcb->prio = TCP_PRIO_MAX; > tcp_send_empty_ack(pcb); tcp_output(pcb);), but I am seeing the ACK > packet transmitted after my data packet is been transferred. > This I didn't understand like why the ACK packet is transferred after data > packet? this is also one of the reason for us to see communication failure. > > I am attaching the images for our communication issues. > Here LWIP_IP: 192.168.6.182 > ECU IP : 192.168.6.144 > If you see LWIP_TCP_DataSentoutFirst.JPG, the data is send first and ACK > is sent after that even though the ACK transmission is initiated first with > priority level set to MAX. > > Please let us know how to solve this issue. > > > > I am adding following steps during lwip init. > > TCPIP_STACK_INTERFACE_0_init(st_ETH_ConfigStruct.u8_SourceMacAddress, > Src_IP, gw); > > netif_set_up(&TCPIP_STACK_INTERFACE_0_desc); > > netif_set_default(&TCPIP_STACK_INTERFACE_0_desc); > > mac_async_enable(&MACIF); > > etharp_add_static_entry(&Dest_IP, (struct eth_addr > *)&st_ETH_ConfigStruct.u8_DestMacAddress[0]); > > pcb_tcp = tcp_new(); > > error = tcp_bind(pcb_tcp, &address, st_ETH_ConfigStruct.u16_SourcePortNum); > > pcb_tcp = tcp_listen(pcb_tcp); > > tcp_accept(pcb_tcp, Etherdo_connected); > > > > After link established, below functions are used to do data transfer. > > > > tcp_write(pcb_tcp,u8_DataBuff,u16_DataLen,TCP_WRITE_FLAG_MORE); > > tcp_output(pcb_tcp)); > > > > This is how I initialized LWIP stack and transmitting data over ethernet. > Here I have used static MAC address as we should connect to particular MAC > address. > > > Regards, > > PraveenKumar. >
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