for benefit of community, I could solve myself: changed Onewire.h line 134 from addr to addr2. And it works 🙂

I am creating an exciting application where I need to read many sensors and also drive many relays. Also I need a Temperature sensor. and all on Core2.
Now I succeeded to run PAHUB together with ExtIO2 so I can read many sensors and drive many relays...which is great!
However, when I want to include a DS18B20 temperature sensor, I need the OneWire library. But when I add this library it throws errors below.
What do I need to do to make it work?

============================
#include <M5Core2.h>
#include "ClosedCube_TCA9548A.h"

#include "UNIT_4RELAY.h"
UNIT_4RELAY relay;

#include "M5_EXTIO2.h"
M5_EXTIO2 extio;
#include <OneWire.h>

========================================================================
errors after compiling:

In file included from /home/pi/Arduino/PAHUB_4RELAY/PaHUB_4RELAY/PaHUB_4RELAY.ino:19:
/home/pi/Arduino/libraries/UNIT_4RELAY/src/UNIT_4RELAY.h:6:14: error: expected ',' or '...' before numeric constant
#define addr 0X26
^~~~
/home/pi/Arduino/libraries/OneWire/OneWire.h:134:40: note: in expansion of macro 'addr'
static uint8_t crc8(const uint8_t *addr, uint8_t len);
^~~~

Felix, you are a star! Now digital outputs and digital inputs are working. Only thing is, I always get returncode 1 back for all extio.x calls so not sure what this one left is?

Didn’t find examples for how to use extio2 on Core2? Anyone can help?

@felmue thank you Felix, that is very helpful and explains. Will check out other pin. Thanks!

I am using OneWire on Pin19 as digital inputs 1,2,3,5,16,17 used. Now I see conflict when initializing SD card. Is File management / SD card management also using Pin 19? Other pin I could use beyond those occupied already?

@felmue thank you very much for your help!

I wanted to measure temperatures with DS18B20 and M5stack using OneWire. Which pin do I need to connect the DATA wire (yellow)?