Enabling Ethernet on the STM32H745I-DISCO Board with TouchGFX Integration

[frosty]

Hello,

I’m working on a project with the STM32H745I-DISCO board and need to utilize the Ethernet interface on the M4 core.

I’ve created a graphical application using TouchGFX that runs on the M7 core, and a user application that runs on the M4 core, using STM32CubeIDE. The generated code indicates a dependency on QUADSPI libraries for the TouchGFX framework. However, according to the User Manual UM2488, to enable Ethernet, SB3 and SB4 must be connected, and resistors R38 and R40 need to be removed. This configuration would disconnect the QUADSPI, creating a conflict with the requirements for TouchGFX.

Given these constraints, what is the best way to configure Ethernet on the STM32H745I-DISCO board without disrupting the necessary connections for TouchGFX?

Kind regards,
Frosty

[STea]

Hello @frosty ,

this conflict between QUADSPI and Ethernet is only present in MII mode thus this constraint :
For 10 Mbit/s half-duplex MII communication, SB3 and SB4 must be ON.

you can try to configure Ethernet in RMII mode that will not use these pins:

RMII pinconfig is as follows for STM32H745I-DISCO:

    /**ETH GPIO Configuration

    PG11     ------> ETH_TX_EN

    PG12     ------> ETH_TXD1

    PG13     ------> ETH_TXD0

    PC1     ------> ETH_MDC

    PA2     ------> ETH_MDIO

    PA1     ------> ETH_REF_CLK

    PA7     ------> ETH_CRS_DV

    PC4     ------> ETH_RXD0

    PC5     ------> ETH_RXD1

    */
Regards