ESP32 Forum

Posted: **Mon Apr 19, 2021 9:23 pm**

Hello,

I have this PCB that I designed around the esp32-wroom-32D and I am using an esp32-wroom-32 programmer to be able to connect it through serial. But when I connect it I get the following error in the serial output:

Code: Select all

rst:0x10 (RTCWDT_RTC_RESET),boot:0x32 (SPI_FAST_FLASH_BOOT)
flash read err, 1000
ets_main.c 371 
ets Jun  8 2016 00:22:57

I am not sure what the problem is, The board was assembled from jlcpcb, so I soldered nothing on there. I have posted the schematic. Am I missing something? Thanks in advance.

Posted: **Tue Apr 20, 2021 5:27 am**

boot:0x32

Gpio12 is high which is selecting 1.8v sdio voltage. You need to burn the efuse to lock it to 3.3v

Posted: **Tue Apr 20, 2021 6:40 am**

You need to burn the efuse to lock it to 3.3v

How would I do that? Could I also ground gpio12 to fix the problem?

Posted: **Tue Apr 20, 2021 7:56 am**

https://github.com/espressif/esptool/wi ... e-vdd_sdio

Posted: **Tue Apr 20, 2021 4:13 pm**

https://github.com/espressif/esptool/wi ... -Selection

ESP32 Forum

Flash read error, 1000 on custom PCB

Flash read error, 1000 on custom PCB

Re: Flash read error, 1000 on custom PCB

Re: Flash read error, 1000 on custom PCB

Re: Flash read error, 1000 on custom PCB

Re: Flash read error, 1000 on custom PCB