esp32-pico-d4 flash error

Posts: 1
Joined: Sun Oct 18, 2020 11:44 am

esp32-pico-d4 flash error

Postby wxlf512 » Sun Oct 18, 2020 11:59 am

Hi, I soldered the Board on an esp32-pico-d4 chip, GPIO12 is pulled up to the GND, and EN and BOOT are connected to the GND via a 10 UF capacitor, and EN is also pulled up to 3.3V via a 10K resistor, when trying to flash this happens:

Code: Select all v2.8                                                                                                         
Serial port COM3
A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header
And if you connect via the serial port at a frequency of 115200, writes:

Code: Select all


flash read err, 1000

ets_main.c 371 

ets Jun  8 2016 00:22:57
And if you short BOOT to GND:

Code: Select all


waiting for download
But the download still doesn't happen.
What could be the problem?

Posts: 62
Joined: Mon Mar 09, 2020 7:36 pm

Re: esp32-pico-d4 flash error

Postby Scott.Bonomi » Mon Nov 02, 2020 11:58 pm

I had a similar issue on my custom board, to activate the serial load feature GPIO0 has to be low at reset. The dev kits do that with a couple of transistors and using the DSR line from the USB.
I have to take a probe,, and ground a pad on the board before hitting the system reset switch. Next spin will be slightly different.
You seem to be be getting RTC Watchdog failures rather than just a power blink reset.
I would expect a reset to give you:
waiting for download

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