OneWireBus does not seem to detect a DS18B20 on featherS2

[Neradoc]

Tested a DS18B20 temperature sensor (with the appropriate resistor) on a Feather S2 and other boards (like Feather M0 express) and the device is not found on the S2. I think I correctly checked it's connected to the right pin (it throws an error otherwise).

Feather S2:

import board
from adafruit_onewire.bus import OneWireBus
ow_bus = OneWireBus(board.IO17)
devices = ow_bus.scan()
print("Devices:",devices)

code.py output:
Devices: []

Feather M0 Express

import board
from adafruit_onewire.bus import OneWireBus
ow_bus = OneWireBus(board.A0)
devices = ow_bus.scan()
print("Devices:",devices)

code.py output:
Devices: [<OneWireAddress object at 20001b20>]

[tannewt]

OneWire is bit banged so it might be digitalio or timing related.

[CrossLAN]

Seems to be the same issue with STM32F405 Cortex M4 CPU on Adafruit Feather STM32F405 Express.
Find my investigations here: OneWire support STM32F405

Perhaps stm32duino / Arduino_Core_STM32 group is working on something similar (no. 412)?
Like @tannewt estimated something with timing.

Maybe this post is helpful even it is not CircuitPython related: Support OneWire device (ex: DS1822) #412

[CrossLAN]

For STM32F405 I filed a fresh issue #3935

[Hyna]

Hello,
I'm having the same issue on ESP32-S2 and nucleoG7.

with this simple code reset() returns always false:

import board
from adafruit_onewire.bus import OneWireBus
ow_bus = OneWireBus(board.XXX)
print("Resetting bus...", end="")
if ow_bus.reset():
    print("OK.")
else:
    print("Nothing found on bus.")

When i probe the bus (on nucleoG7), timing is not correct. According to source there should be common_hal_mcu_delay_us(480); with BUS low. Then bus is switched to input followed by common_hal_mcu_delay_us(70); After that the bus level is read.
In my case, first delay is only about 420 us, which is outside the spec for most of the 1wire devices.
Reset() returns false.

Even more strange behavior with 1wire eeprom AT21:

[dhalbert]

@Hyna see if #5866 helps for you.

[dhalbert]

Closing in favor of #5865, but will xref to here.