STM32H7S78-DK: Issues with ETH and LwIP

[BartekTaczala]

Hi,

I'm having a project that uses LTDC (565) UART4 (for printf debugging purposes) and ETH/LwIP. 

The issue i'm having is an infinite loop in `LAN8742_Init` : 

```

while(regvalue & LAN8742_BCR_SOFT_RESET)

```

always evalute to true and 

```

if((pObj->IO.GetTick() - tickstart) <= LAN8742_SW_RESET_TO)

``` 

evalutes to true as well (tickstart is 0 and pObj->IO.GetTick() also returns 0).

STM32CubeMX warns me about possible conflicts with PIN - but I don't think LTDC and UART/ETH are using the same pins. Ater enabling ETH CubeMX warned about Clock but autoresolver fixed the issue. 

[Pavel A.]

One of reasons can be failure of handshake with the PHY.

If you suspect conflict with other components, disable them and get the ETH working first.

> tickstart is 0 and pObj->IO.GetTick() also returns 0).

Maybe the PHY setup is broken too. Replace this to HAL_GetTick(). If HAL_GetTick keeps returning 0, the tick timer is broken. Too bad.