I have developed a custom PCB board for a personal project which I had assembled in China via JLCPCB. I have problems programming the board via UART using a CP2102 board.
I have tested strapping pins:
* GPIO0: LOW (PCB pull-down)
* GPIO2: LOW (PCB pull-down)
* GPIO5: HIGH (internal pull-up)
* GPIO12: LOW (internal pull-down)
* GPIO15: HIGH (PCB pull-up)
When I try to program the ESP32 Pico I push the button connected to EN so it is LOW (measured with multimeter). I put a probe of my oscilloscope (Analog Discovery) in the TX pin of the ESP32 pico and it is always HIGH, except when I press the EN button. In this case I see high frequency noise (MHz) which makes me believe that the chip is not broken.
The schematics can be found in this image:
I have tried powering it with the CP2102 board and also using a 12V 2A connected to the AMS1117-3.3 in my board. In both cases the results were the same.
Any ideas where the problem could be or what else could I test?
ESP32 Pico custom PCB flashing error
Re: ESP32 Pico custom PCB flashing error
What error do you get when you try to flash it? And how are you flashing it? From ESP-IDF or Arduino IDE?
Re: ESP32 Pico custom PCB flashing error
It will do only if you burn efuse.jpfaguirre wrote:GPIO12: LOW (internal pull-down)
https://github.com/espressif/esptool/wi ... -Selection
-
- Posts: 4
- Joined: Fri Apr 03, 2020 2:58 pm
Re: ESP32 Pico custom PCB flashing error
I tried flashing it both with ESP-IDF and Arduino. In both cases the error was timeout. When I reset putting IO0 to GND and pressing enable nothing is sent by the ESP32 via UART (nothing seen on serial terminal nor in the TX Pin using an oscilloscope).
Re: ESP32 Pico custom PCB flashing error
Connect a terminal like putty and check if you are able to receive some text during boot process.
If not, it could be a problem of the GND PAD soldering. The GND pad footprint shoul not be solid but similar to the one in the following image.
I had also a similar problem with JLPCB because JLPCB normally doesn't correct automatically footprint errors like this.
If not, it could be a problem of the GND PAD soldering. The GND pad footprint shoul not be solid but similar to the one in the following image.
I had also a similar problem with JLPCB because JLPCB normally doesn't correct automatically footprint errors like this.
Who is online
Users browsing this forum: No registered users and 49 guests