in STM32H7 ping only works when reset button is pressed but not working when i completely shut off the supply and restart the mcu?

[Akash_k]

I am working on STM32H743VIT6 and using LAN8742 as phy. i generated the project using stmcube using repository stm32h7 1.5.0 . I used the same mpu and system clock configuration as in the ST examples. When I switched on the supply to mcu, the ping does not work. After pressing the reset button , ping started working.

Please find the attached system clock, mpu and lwipopts code.

[turboscrew]

It is possible that Cube tries to initialize the chip too soon.

By the data sheet, it takes at least about 26 ms from the power-on before trying to communicate with it. Probably a longer delay is needed.

That 26 ms is a "HW start-up time", so it may be too short, but I didn't do any further investigations.

[Akash_k]

Thank you, It worked but I had to introduce delay of 500 ms and 1 second in the initialization. I hope it works when I enable other modules of the MCU.

int main(void)

{

 MPU_Config();

 SCB_EnableICache();

 SCB_EnableDCache();

 HAL_Init();

 SystemClock_Config();

HAL_Delay(500);

 MX_GPIO_Init();

HAL_Delay(1000);

 MX_LWIP_Init();

 while (1)

 {

MX_LWIP_Process();

 }

}

[Piranha]

https://community.st.com/s/question/0D50X0000C6eNNSSQ2/bug-fixes-stm32h7-ethernet

https://community.st.com/s/question/0D50X0000AhNBoWSQW/actually-working-stm32-ethernet-and-lwip-demonstration-firmware

In other words it does not work and will not work in a foreseeable future, because the intellectual capability of HAL/Cube developers is too low to even understand these problems.

[MStro.4]

@Community member​ 

Hey,

did you solve this problem?

I have an identical problem to yours on the same processor (STM32H743VIT6). After powering my PCB, I have to reset the entire system to make the LAN8742A work properly.