Could not open COM4, the port doesn't exist

Barczi
Posts: 5
Joined: Sat Mar 08, 2025 10:15 am

Could not open COM4, the port doesn't exist

Postby Barczi » Sat Mar 08, 2025 10:28 am

I am trying to program "esp32 c3 mini 1". I soldered usb wires directly to module:
IO18 - D-
IO19 - D+
3v3 and enable - 5V wire through 3.3V regulator (with 10uF capacitors on Input and Output)
Gnd - Gnd
When I try to program in Arduino IDE I see a port that the board is connected to, but I get:
"A fatal error occurred: Could not open COM4, the port doesn't exist"
When I program development boards there is no problem. What should I do?

Sprite
Espressif staff
Espressif staff
Posts: 10609
Joined: Thu Nov 26, 2015 4:08 am

Re: Could not open COM4, the port doesn't exist

Postby Sprite » Sun Mar 09, 2025 1:11 am

You also need a RC network on the EN pin, as well as potentially pull-up/downs on GPIO8/9.

Barczi
Posts: 5
Joined: Sat Mar 08, 2025 10:15 am

Re: Could not open COM4, the port doesn't exist

Postby Barczi » Sun Mar 09, 2025 11:23 am

It turned out that I I needed to swap D+ and D- lines and it works. Without RC circuit on enable. I needed tho to enter bootloader mode at first power up.

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