Re: [lwip-users] LWIP v2.0.0 hangs without Phy

[Stephen Cowell]

We use LWIP l.4.l with RAW (no OS).  I had to query my PHY's control/status register to determine the link status... I did this from main loop (non-interrupt) time.  There is also a protocol for requesting direct PHY access, depending on the uP's interface.  Huge PITA, but entirely necessary for our application.  Nothing about LWIP was involved.  If you're using OS you'll have to suspend the LWIP thread(s) to do this.

-- 
Stephen Cowell
Project Manager/Engineer
Plasmability LLC
www.plasmability.com

On 10/13/2017 6:48 AM, Gustavo Costa TAP wrote:

Hi Jens,

thank you for your colaboration. Is it possible that you share if me your fix? I am trying not to reinvent the wheel. 

As I said to Simon, I am trying to use the LWIP_NETIF_LINK_CALLBACK and LWIP_NETIF_STATUS_CALLBACK functions to keep track of the Phy Link, but these functions never gets called, even if I disconnect the cable.

My demicode is as below:

#if LWIP_NETIF_STATUS_CALLBACK

void status_callback(void) {

LED_BLUE_TOGGLE();

}

#endif /* LWIP_NETIF_STATUS_CALLBACK */

#if LWIP_NETIF_LINK_CALLBACK

void link_callback(void) {

if (netif_is_link_up(&fsl_netif0)) {  //DES link up blink fast

LED_GREEN_ON();

dhcp_start(&fsl_netif0);

netif_set_up(&fsl_netif0);

} else {

LED_GREEN_OFF();

dhcp_stop(&fsl_netif0);

netif_set_down(&fsl_netif0);

}

}

#endif /* LWIP_NETIF_LINK_CALLBACK */

-------------------------------------------------------------------

        PRINTF("TCP/IP initializing...\r\n");

tcpip_init(NULL, NULL);

PRINTF("TCP/IP initialized.\r\n");

xSemaphoreENET = xSemaphoreCreateBinary();

while (netif_add(&fsl_netif0, &fsl_netif0_ipaddr, &fsl_netif0_netmask,

&fsl_netif0_gw,

NULL, ethernetif_init, tcpip_input) == NULL) {

netif_remove(&fsl_netif0);

vTaskDelay(1000 / portTICK_PERIOD_MS);

}

WDOG_Refresh(WDOG);

netif_set_default(&fsl_netif0);

netif_set_up(&fsl_netif0);

#if LWIP_NETIF_STATUS_CALLBACK

netif_set_status_callback(&fsl_netif0, status_callback);

#endif /* LWIP_NETIF_STATUS_CALLBACK */

#if LWIP_NETIF_LINK_CALLBACK

netif_set_link_callback(&fsl_netif0, link_callback);

#endif /* LWIP_NETIF_LINK_CALLBACK */

err = dhcp_start(&fsl_netif0);

---------------------------------------------------------------------------------------

Thank you very much.

Best Regards,

 

Gustavo Costa Engenheiro Eletricista Departamento de P&D Tap Eletro Sistemas Ltda. (31) 3395-1180/9 8769-8593 address@hidden

2017-10-12 12:24 GMT-03:00 Jens Nielsen <address@hidden>:

Yes I fixed this particular problem in a driver recently, it was waiting for autonegotiation to complete. 6th parameter to netif_add is a function pointer to an init function in your code, that's where you'll find your bug.

On 2017-10-12 10:33, Simon Goldschmidt wrote:

When the "netif_add" api is called without the cable being actually plugged the function just hangs and my wdog barks.

Now this can't be an lwIP bug: lwIP knows nothing of phys. That is part of your netif driver, which probably needs fixing.

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