ESP32 Forum

Posted: **Fri Mar 17, 2017 7:09 pm**

One of my ESP32 is now dead, unable to boot the Flash, and falling into basic :

rst:0x7 (TG0WDT_SYS_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
flash read err, 1000
Falling back to built-in command interpreter.
OK
>ets Jun  8 2016 00:22:57

rst:0x7 (TG0WDT_SYS_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
flash read err, 1000
Falling back to built-in command interpreter.
OK

I've tested the Flash with esptool.py, and it flashid is read as :

Code: Select all

Manufacturer: ff
Device: ffff

Seeing that wrong Id, I've uncapped the ESP, and replaced the flash, but still the same ...
It seems that SPI port is now broken.

Posted: **Fri Mar 17, 2017 7:18 pm**

What is voltage on flash vcc pin? Did you change flash clk speed, mode (dio/qio)? Is encryption enabled (check efuse)?

Posted: **Fri Mar 17, 2017 7:26 pm**

This ESP32S was working since December.
After, I uncapped ESP, I measured the VCC pin, it was strangely at 0.9V, so while connecting new one, I've lifted it to connect it directly to 3.3V instead of the VDD_SDIO, but was still not working ...
Probably the whole VDD_SDIO bus is defective and some other internal peripherals not working.

Fortunately, I've received an EZSBC using ESP-WROOM32 last week, at least I can still play with this toy.

(Hoping that Rev2 will be come into prod soon, I will then purchase some more)

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