ESP32 Flash Download Issue

[ESP_Sprite]

It's a bootstrap pin, it needs to be low on boot. Alternatively, you can use e.g. espefuse.py to burn the fuses to force the flash voltage to some value independent of that bootstrap pin.

[Stef_Esp32]

GPIO_12 = MTDI

When pulled high it sets the VDD_SDIO voltage to 1.8V, pulled low sets it to 3.3V. This matches your observed change in flash voltage.

Level is sampled on release of reset only, so level after that does not matter.

See ESP32 datasheet: 2.4 Strapping Pins

The strapping pins can be overruled by burning eFuses (as I learned yesterday).

See also my post about flash problem on ESP32-U4HWD. I think the information there applies to your situation as well.

[Ritesh]

It's a bootstrap pin, it needs to be low on boot. Alternatively, you can use e.g. espefuse.py to burn the fuses to force the flash voltage to some value independent of that bootstrap pin.

Hello ESP_Sprite,

Thanks for your quick response. So, It should be only pulled down on boot and then it can be used for any purpose once system will be started successfully? or it should be required forever pulled down?

[Ritesh]

GPIO_12 = MTDI

When pulled high it sets the VDD_SDIO voltage to 1.8V, pulled low sets it to 3.3V. This matches your observed change in flash voltage.

Level is sampled on release of reset only, so level after that does not matter.

See ESP32 datasheet: 2.4 Strapping Pins

The strapping pins can be overruled by burning eFuses (as I learned yesterday).

See also my post about flash problem on ESP32-U4HWD. I think the information there applies to your situation as well.

Thanks for sharing details

Would you please share your flash problem link?

[Stef_Esp32]

Would you please share your flash problem link?

It's here in the same forum:
viewtopic.php?f=12&t=28486

[Ritesh]

Would you please share your flash problem link?

It's here in the same forum:
viewtopic.php?f=12&t=28486

Thanks for providing updates for the same.

I will check it and let you know if need anything else