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Re: ESP32 Flash Download Issue
Posted: Thu Jun 23, 2022 5:09 am
by 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.
Re: ESP32 Flash Download Issue
Posted: Thu Jun 23, 2022 9:44 am
by 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.
Re: ESP32 Flash Download Issue
Posted: Fri Jun 24, 2022 9:22 am
by Ritesh
ESP_Sprite wrote: ↑Thu Jun 23, 2022 5:09 am
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?
Re: ESP32 Flash Download Issue
Posted: Fri Jun 24, 2022 9:30 am
by Ritesh
Stef_Esp32 wrote: ↑Thu Jun 23, 2022 9:44 am
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?
Re: ESP32 Flash Download Issue
Posted: Wed Jun 29, 2022 11:37 am
by Stef_Esp32
Ritesh wrote: ↑Fri Jun 24, 2022 9:30 am
Would you please share your flash problem link?
It's here in the same forum:
viewtopic.php?f=12&t=28486
Re: ESP32 Flash Download Issue
Posted: Wed Jun 29, 2022 4:03 pm
by Ritesh
Thanks for providing updates for the same.
I will check it and let you know if need anything else