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Asked: October 11, 2023In:
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Hello, I am trying to put together a design with WROVER and LAN8720A. Based on existing designs similar as the one with WROOM and LAN8720A, GPIO17 is applied as EMAC_CLK_OUT. I wonder if there are any alternate pins for EMAC_CLK_OUT. Since ...Read more

Hello,

I am trying to put together a design with WROVER and LAN8720A. Based on existing designs similar as the one with WROOM and LAN8720A, GPIO17 is applied as EMAC_CLK_OUT. I wonder if there are any alternate pins for EMAC_CLK_OUT. Since WROVER uses GPIO17 for SPIRAM, if I can not apply a different pin, also I am stuck with WROOM only. It’s good to know what my options are.

Thanks in advance.

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designsespLAN8720ApowerSPIRAMwroomwrover
  1. ellasmith
    This answer was edited.

    Hello, I did this numerous years ago, so I'm still determining what has been modified in the software. But back also you could configure to use GPIO0 as the CLK.The problem with this was that it didn't allow uploading the firmware automatically. You had to manually keep GPIO0 low and reset it to putRead more

    Hello,

    I did this numerous years ago, so I’m still determining what has been modified in the software. But back also you could configure to use GPIO0 as the CLK.
    The problem with this was that it didn’t allow uploading the firmware automatically. You had to manually keep GPIO0 low and reset it to put it in bootloader mode for downloading. I wouldn’t say I liked this approach so I did it this way rather.

    I do not use that design presently, mostly because I only use the ESP32- S3, and there’s no stock of the LAN8720A. When I need Ethernet I use the KSZ8851SNL Ethernet Controller. Works great.

    Thank You

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