topic Re: Problem in ethernet starts while LAN cable disconnected in MCUXpresso SDK

Problem in ethernet starts while LAN cable disconnected

biafra — Tue, 17 Oct 2023 11:21:16 GMT

Hi everyone,

I'm using a custom board based on RT1064, with MCUXpresso 11.8.0 and SDK 2.12.0.

The board uses a LAN8720A ethernet tranceiver that is working fine.

I have a trouble when the system starts with then LAN cable disconnected: if I connect the cable after the init is completed, a ping packet from another device is not answered.

Here is a summary of my code:

tcpip_init( NULL, NULL ); ... netif_add( &NetIfLAN, &IPAddress, &NetMask, &DGAddress, &EthConfig, ethernetif0_init, tcpip_input ); netif_set_default( &NetIfLAN ); StartNetworkSupervisor();

void NetWorkSupervisor( void ) { bool link, oldlink = false; while( 1 ) { if( PHY_GetLinkStatus( EthConfig.phyHandle, &link ) != kStatus_Success ) link = false; if( link != oldlink ) { if( link != false ) { PRINTF( "LINK UP\n" ); sys_lock_tcpip_core(); //netif_set_link_up( &NetIfLAN ); netif_set_up( &NetIfLAN ); sys_unlock_tcpip_core(); } else { PRINTF( "LINK DOWN\n" ); sys_lock_tcpip_core(); //netif_set_down( &NetIfLAN ); netif_set_link_down( &NetIfLAN ); sys_unlock_tcpip_core(); } oldlink = link; } ... } }

In the terminal I can see the "LINK UP" and "LINK DOWN" strings, so the connection and disconnection events are handled. I tried both with and without the netif_set_link_up() and netif_set_link_down() calls, but the behaviour is the same.

Does anyone have some suggestion?

Many thanks

Biafra

Re: Problem in ethernet starts while LAN cable disconnected

Pavel_Hernandez — Tue, 17 Oct 2023 23:17:34 GMT

Hello, my name is Pavel, and I will be supporting your case, I reviewed your comments, and I suggest reviewing the example on the SDK because there are some states in the protocol that need to wait. Maybe you could do a porting.

Pavel_Hernandez_0-1697584609430.png

Best regards,
Pavel

Re: Problem in ethernet starts while LAN cable disconnected

biafra — Wed, 18 Oct 2023 14:24:48 GMT

Hi Pavel,

Many thanks for your answer.

I reviewed some example in SDK about LwIP, and I noticed that in freertos examples netifapi_netif_xxx functions are used.

So in my code I replaced the netif_xxx functions with the corresponding netifapi_netif_xxx functions, but the behaviour is the same.

In such examples I couldn't find the states to wait you mentioned: can you give me some details about them?

Many thanks

Biafra

Re: Problem in ethernet starts while LAN cable disconnected

Pavel_Hernandez — Tue, 31 Oct 2023 20:49:25 GMT

Hello, sorry for the late response I apologize for the last response I was not clear; I recommend reviewing how the examples work they have a blocking mode of wait state until connecting the LAN cable.

Pavel_Hernandez_0-1698785290261.png

Best regards,
Pavel

Re: Problem in ethernet starts while LAN cable disconnected

biafra — Thu, 02 Nov 2023 08:54:03 GMT

Hi @Pavel_Hernandez,

Many thanks for your answer.

Sorry for my my lack of clarity, I'll try to explain myself better.

The blocking mode have a configurable max numer of attempts (ENET_ATONEGOTIATION_TIMEOUT) to wait until connecting the LAN cable. If I connect the LAN cable before the number of attempts reaches ENET_ATONEGOTIATION_TIMEOUT the system works fine.

The system doesn't work if I connect the LAN cable after the max numer of attempts is reached.

The NetWorkSupervisor task is intended to recognize the cable connection/disconnection and to do the needed operartions to make the system work in all situations.

Many thanks

Biafra

Re: Problem in ethernet starts while LAN cable disconnected

Pavel_Hernandez — Tue, 07 Nov 2023 22:43:09 GMT

Hello, sorry for the late response what is the example where you find that functions NetWorkSupervisor, I reviewed the httpsrv_freertos but I can't find this.

Best regards,
Pavel

Re: Problem in ethernet starts while LAN cable disconnected

biafra — Wed, 08 Nov 2023 08:28:46 GMT

Hi @Pavel_Hernandez,

Many thanks for your answer.

There isn't the NetWorkSupervisor() function in the examples, it's a function I've written thinking that it's needed to make the network work if it starts with the cable disconnected.

Many thanks

Biafra

Re: Problem in ethernet starts while LAN cable disconnected

Pavel_Hernandez — Wed, 08 Nov 2023 23:51:36 GMT

Hello, sorry but I´m afraid there is no nothing like this, I suggest creating a task supervisor to avoid using the counter.

Best regards,
Pavel