8000 Unable to configure pin 18 & 19 as GPIO output in ESP32C3 · Issue #12479 · micropython/micropython · GitHub
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Unable to configure pin 18 & 19 as GPIO output in ESP32C3 #12479

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pbdaran opened this issue Sep 19, 2023 · 5 comments
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Unable to configure pin 18 & 19 as GPIO output in ESP32C3 #12479

pbdaran opened this issue Sep 19, 2023 · 5 comments
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@pbdaran
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pbdaran commented Sep 19, 2023

I compiled the micropython code by cloning it from github, for ESP32C3. After flashing the firmware.bin, I tried to configure the pins 18 and 19 as GPIO output. But getting an error as invalid pins.
I did the same procedure few weeks back and it was all fine then.
Is it caused by any recent changes in micropython?
@pbdaran pbdaran added the bug label Sep 19, 2023
@jimmo
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jimmo commented Sep 19, 2023

@pbdaran We changed the firmware to enable the USB serial/jtag interface by default. Originally we didn't enable this because the engineering sample chips didn't support it.

This is on pins 18 & 19 (which are the D+/D- pins for the USB interface).

You can override this (to disable it again) by setting CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG=n in boards/ESP32_GENERIC_C3/sdkconfig.c3usb`.

@pbdaran
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pbdaran commented Sep 20, 2023

Thank you, @jimmo!
I set CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG=n in the sdkconfig file.
Now I can use the pins 18 & 19 as GPIO.

@pbdaran pbdaran closed this as completed Sep 20, 2023
@MetroMushrooms MetroMushrooms mentioned this issue Dec 19, 2024
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@MetroMushrooms
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@jimmo Have you figured out a way to go about this with the s3? I've tried a few solutions including this one and the closest I've come is logging a ton of external interference on gpio 19, but no control over it.

@rini711
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rini711 commented Mar 13, 2025 •
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I am using ESP-IDF v5.2.2 and micropython version v5.2 for ESP32C3.

After flashing the firmware.bin, I tried to configure the pins 18 and 19 as GPIO output. But getting an error as invalid pins.

I set CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG=n in boards/ESP32_GENERIC_C3/sdkconfig.c3usb` and set #define MICROPY_HW_ESP_USB_SERIAL_JTAG 0 in mpconfigport.h file,

Also, Tried commenting out below lines in - /mpconfigport.h
// Enable stdio over USB Serial/JTAG peripheral
#ifndef MICROPY_HW_ESP_USB_SERIAL_JTAG
#define MICROPY_HW_ESP_USB_SERIAL_JTAG (SOC_USB_SERIAL_JTAG_SUPPORTED && !MICROPY_HW_USB_CDC)

but still getting error as invalid pins.

How can i resolve this issue and configure the pins 18 and 19 as GPIO output.
@jimmo @pbdaran @andrewleech @projectgus @garywill @ALL @MetroMushrooms

@fortuna
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fortuna commented Apr 2, 2025

I figure it out.

You need to configure those pins as input with a pull-up resistor, as per https://gitlab.com/tidklaas/hip-badge/-/blob/4e7ef0a6cbe69c84d8b86f08941768e6e8785b10/firmware/blinkenlights/main/control.c#L422-424

To flash is a pain. I wrote the instructions at https://github.com/fortuna/ESPHomeBadge?tab=readme-ov-file#known-flashing-issue.

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