CircuitPython version

Adafruit CircuitPython 9.1.2 on 2024-08-22; Adafruit Feather ESP32-C6 4MB Flash No PSRAM with ESP32C6

Code/REPL

import board
from digitalio import DigitalInOut, Direction, Pull

pwr = DigitalInOut(board.NEOPIXEL_I2C_POWER)
pwr.direction = Direction.OUTPUT
print(pwr.value)
pwr.value = True
print(pwr.value)

Behavior

Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.
code.py output:
False
True

Description

the board definition for the C6 has the pin reset function in board.c:

bool espressif_board_reset_pin_number(gpio_num_t pin_number) {
    if (pin_number == 20) {
        // Turn on I2C power by default.
        gpio_set_direction(pin_number, GPIO_MODE_DEF_OUTPUT);
        gpio_set_level(pin_number, true);
        return true;
    }

    return false;
}

but for some reason does not seem to be working. i tested an esp32-s2 and esp32-s3 feather that have the same functions and they are setting the pin high on startup, so it seems to be isolated to the C6. i discovered this while running an i2c scan and continually getting:
RuntimeError: No pull up found on SDA or SCL; check your wiring
i had assumed incorrectly that the i2c pins were included in the pins that had been changed before 9.1.2 so i hadn't looked into it more closely.

Additional information

In Arduino, the pin is automatically being set high so the pin number is correct (20).