facing issue in enabling ethernet in esp32 wrover kit with idf version release/4.2

[ESP_ondrej]

OK, so it seems the PHY Reset is always pulled up (probably, since I don't have the full schematics). It is definitely not connected to GPIO19 since this one is used by TXD[0] RMII signal. If it is really pulled up, please set RST GPIO to "-1" in menuconfig.

Anyway, there is external RMII REF CLK oscillator (Y1) which needs to be enabled. Search to which GPIO is "osc_en" connected. Once you find it, update appropriately your code. The oscillator needs to be enabled prior ESP-IDF Ethernet initialization.

The code could be something like this:

Code: Select all

    // Enable external CLK
    esp_rom_gpio_pad_select_gpio(EXTERNAL_CLK_EN_GPIO);
    gpio_set_direction(EXTERNAL_CLK_EN_GPIO, GPIO_MODE_OUTPUT);
    gpio_set_level(EXTERNAL_CLK_EN_GPIO, 1);

Where EXTERNAL_CLK_EN_GPIO is GPIO number the "osc_en" is connected to.

[ESP_ondrej]

I also noticed that PHY address should be set to 0 based on comment in the schematics.

[kesha.modhia]

this is the full schematic for NLG1200 I hope this will be helpful for guiding me meanwhile I am doing changes as you mentioned below

[Edit]
Attachment was deleted by administrator.

[ESP_ondrej]

I see. The general idea is still the same - you need to enable CLK oscillator. However, the way how to do it will be more complicated. You need to enable it via PCAL6416AH IO expander which is controlled via I2C. Therefore, you need to properly configure & initialize I2C bus, study how to control the IO expander and send proper command.

[kesha.modhia]

Okay, Could you please guide me for what reason phy used and what is the role of crystal oscillator in this case, because, from where to configure OSC, that i am not aware of.

[ESP_ondrej]

Here is some information related to MAC/PHY clocking https://docs.espressif.com/projects/esp ... ac-and-phy.

Just note that you don't need to configure oscillator, you just need to enable it which is done via IO expander in your case.