Ethernet - pins being pulled down after Ethernet.begin()

[xRadx]

Hi,

have anyone faced such situation that following pins are begin pulled down:
PB11, PB12, PB5, PC2, PE2, PG14, PG8 after calling Ethernet.begin() ?

Firstly I init Serial, Serial4, Serial5, then most pins avaliable on the board as input_pullup.
Then I read them and all are high. Next I call Ethernet.begin() and read all the pins again and the above ones are low (the rest stays as high)...

I use Nucleo F746GZ.

[fpistm]

Hi,
by defauolt Ethernet pins are set to PU:

Arduino_Core_STM32/variants/STM32F7xx/F745Z(E-G)T_F746Z(E-G)(T-Y)_F750Z8T_F756ZG(T-Y)/PeripheralPins.c

Lines 391 to 417 in 50629bd

	WEAK const PinMap PinMap_Ethernet[] = {
	{PA_0, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_CRS
	{PA_1, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_REF_CLK
	{PA_1_ALT1, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_RX_CLK
	{PA_2, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_MDIO
	{PA_3, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_COL
	{PA_7, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_CRS_DV
	{PA_7_ALT1, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_RX_DV
	{PB_0, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_RXD2
	{PB_1, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_RXD3
	{PB_5, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_PPS_OUT
	{PB_8, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_TXD3
	{PB_10, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_RX_ER
	{PB_11, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_TX_EN
	{PB_12, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_TXD0
	{PB_13, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_TXD1
	{PC_1, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_MDC
	{PC_2, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_TXD2
	{PC_3, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_TX_CLK
	{PC_4, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_RXD0
	{PC_5, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_RXD1
	{PE_2, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_TXD3
	{PG_8, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_PPS_OUT
	{PG_11, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_TX_EN
	{PG_13, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_TXD0
	{PG_14, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)}, // ETH_TXD1
	{NC, NP, 0}

but probably the HAL set it to down.
Note that you have to redefine this weak array with the pins used for ETH.
See https://github.com/stm32duino/Arduino_Core_STM32/wiki/Custom-definitions#custom-pinmap-array

[xRadx]

I made a file "build_opt.h" (in the sketch folder) with lines:
const PinMap PinMap_Ethernet[] = {
{PA_1, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)},
{PA_2, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)},
{PA_7, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)},
{PB_13, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)},
{PC_1, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)},
{PC_4, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)},
{PC_5, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)},
{PG_11, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)},
{PG_13, ETH, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF11_ETH)},
{NC, NP, 0}
}
(these pins used are as generated by CubeMX and it works in a CubdeIDE) and included (#include "build_opt.h") in the project.ino file.

However it does not compile and gives errors:
arm-none-eabi-g++: warning: const: linker input file unused because linking not done
arm-none-eabi-g++: error: const: linker input file not found: No such file or directory
arm-none-eabi-g++: warning: PinMap: linker input file unused because linking not done
arm-none-eabi-g++: error: PinMap: linker input file not found: No such file or directory
arm-none-eabi-g++: warning: PinMap_Ethernet[]: linker input file unused because linking not done
arm-none-eabi-g++: error: PinMap_Ethernet[]: linker input file not found: No such file or directory
...
arm-none-eabi-g++: warning: {PA_1,: linker input file unused because linking not done
arm-none-eabi-g++: error: {PA_1,: linker input file not found: No such file or directory
arm-none-eabi-g++: warning: ETH,: linker input file unused because linking not done
arm-none-eabi-g++: error: ETH,: linker input file not found: No such file or directory
...

I was trying to find a help/tips on internet/youtube, but nothing found...

[fpistm]

No build_opt.h is not a C file. Put your new array on top of your sketch.

[xRadx]

Now it works. Thanks!