LWIP: Random Initialization Failure

[Rick MC]

Posted on July 10, 2018 at 15:03

I have a STM32F769-Disco board. I used CubeMX to implement ethernet communication in RMII mode. I'm not using any OS. No DHCP. I left the configuration pretty much like default.

I have the ping to the board working normally. The only problem is that, when the microcontroller is

booted or is reset,

the ping does not always work. 

I found out this problem is caused by an

if statement

in function HAL_ETH_GetReceivedFrame() in stm32f7xx_hal_eth, where the following condition happens to be false:

if(((heth->RxDesc->Status & ETH_DMARXDESC_OWN) == (uint32_t)RESET))

I do not understand why this happens in such a random way.. Does anyone have already faced this problem?

Thanks!

[Imen.D]

Posted on July 10, 2018 at 15:15

Hello

marco.pirotta

 ,

Check the PHY address value in ETH configuration and make sure you set the PHY address to 0

With Regards,

Imen

[Rick MC]

Posted on July 10, 2018 at 15:26

Hello

DAHMEN.IMEN

. I already knew about the PHY address and I had already set it to zero!

[Rick MC]

Posted on July 11, 2018 at 15:53

Hello

DAHMEN.IMEN

‌,

do you have any other suggestion about my issue?? I'm pretty stuck and out of ideas..

Thanks

[Imen.D]

Posted on July 12, 2018 at 12:57

Hello 

marco.pirotta

,

Have a look to the 

https://www.st.com/content/ccc/resource/technical/document/errata_sheet/group0/23/a6/11/0b/30/24/46/a5/DM00257543/files/DM00257543.pdf/jcr:content/translations/en.DM00257543.pdf

 to check if you have the same conditions as described in the Ethernet peripheral limitations section.

With Regards,

Imen

[Rick MC]

Posted on July 12, 2018 at 15:07

Hello 

DAHMEN.IMEN

, 

I checked the Errata sheet but I can&39t find anything close to my problem.. 

Here is what I also tried to do: 

- increase the C-STACK to 0x1550 and the HEAP to 0x2AA0 (almost the maximum they can reach)

- Add MPU_Config() and CPU_CACHE_Enable() before HAL_Inith() as in \STM32Cube\Repository\STM32Cube_FW_F7_V1.11.0\Projects\STM32F769I_EVAL\Applications\LwIP\LwIP_HTTP_Server_Raw

Anyway I don&39t think anything has changed..I still have the same problem: the ping to the board works just some times..

[Rick MC]

Posted on July 16, 2018 at 11:03

DAHMEN.IMEN

, 

is it possible that this is some kind of problem not included in the Errata sheet?

Please let me know!