hello everyone,

in the morning at 9:50 AM my board stops working (everything was fine bevor). Nothing special happend, no reboot, no system update, or something else...

I see the board on the console at address 0x18:

[root@1-wire ~]# i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- 18 -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --                         

But my 1-wire server give up...

[root@1-wire ~]# owserver --foreground --i2c=/dev/i2c-1 --error_level=9
  DEBUG: ow_daemon.c:(170) main thread id = 547805967488
  DEBUG: ow_inotify.c:(80) No configuration files to monitor
CONNECT: ow_dnssd.c:(81) Zeroconf/Bonjour is disabled since dnssd library isn't found
   CALL: ow_parsename.c:(174) path=[]
  DEBUG: owlib.c:(77) Global temp limit 0C to 100C (for fake and mock adapters)
  DEBUG: ow_regex.c:(24) Reg Ex expression <^$> compiled to 0x7f8c45f1d0
  DEBUG: ow_regex.c:(24) Reg Ex expression <^all$> compiled to 0x7f8c45f210
  DEBUG: ow_regex.c:(24) Reg Ex expression <^scan$> compiled to 0x7f8c45f250
  DEBUG: ow_regex.c:(24) Reg Ex expression <^\*$> compiled to 0x7f8c45f290
  DEBUG: ow_regex.c:(24) Reg Ex expression <^[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}$> compiled to 0x7f8c45f2d0
  DEBUG: ow_regex.c:(24) Reg Ex expression <^-?[[:digit:]]+$> compiled to 0x7f8c45f310
]*$> compiled to 0x7f8c45f350Ex expression <^ *([^ ]+)[ 
]*$> compiled to 0x7f8c45f390Ex expression <^ *([^ ]+) *: *([^ ]+)[ 
]*$> compiled to 0x7f8c45f3d0Ex expression <^ *([^ ]+) *: *([^ ]+) *: *([^ ]+)[ 
  DEBUG: ow_regex.c:(53) Not found
  DEBUG: ow_regex.c:(53) Not found
  DEBUG: ow_regex.c:(100) 0: 0->10 found <></dev/i2c-1><>
  DEBUG: ow_regex.c:(100) 1: 0->10 found <></dev/i2c-1><>
  DEBUG: ow_parse_address.c:(87) Text </dev/i2c-1>
  DEBUG: ow_parse_address.c:(142) First </dev/i2c-1>
CONNECT: ow_ds2482.c:(396) Found an i2c device at /dev/i2c-1 address 18
  DEBUG: ow_ds2482.c:(516) ok
CONNECT: ow_ds2482.c:(422) i2c device at /dev/i2c-1 address 18 cannot be reset. Not a DS2482.
CONNECT: ow_ds2482.c:(396) Found an i2c device at /dev/i2c-1 address 19
CONNECT: ow_ds2482.c:(422) i2c device at /dev/i2c-1 address 19 cannot be reset. Not a DS2482.
CONNECT: ow_ds2482.c:(396) Found an i2c device at /dev/i2c-1 address 1A
CONNECT: ow_ds2482.c:(422) i2c device at /dev/i2c-1 address 1A cannot be reset. Not a DS2482.
CONNECT: ow_ds2482.c:(396) Found an i2c device at /dev/i2c-1 address 1B
CONNECT: ow_ds2482.c:(422) i2c device at /dev/i2c-1 address 1B cannot be reset. Not a DS2482.
CONNECT: ow_ds2482.c:(396) Found an i2c device at /dev/i2c-1 address 1C
CONNECT: ow_ds2482.c:(422) i2c device at /dev/i2c-1 address 1C cannot be reset. Not a DS2482.
CONNECT: ow_ds2482.c:(396) Found an i2c device at /dev/i2c-1 address 1D
CONNECT: ow_ds2482.c:(422) i2c device at /dev/i2c-1 address 1D cannot be reset. Not a DS2482.
CONNECT: ow_ds2482.c:(396) Found an i2c device at /dev/i2c-1 address 1E
CONNECT: ow_ds2482.c:(422) i2c device at /dev/i2c-1 address 1E cannot be reset. Not a DS2482.
CONNECT: ow_ds2482.c:(396) Found an i2c device at /dev/i2c-1 address 1F
CONNECT: ow_ds2482.c:(422) i2c device at /dev/i2c-1 address 1F cannot be reset. Not a DS2482.
  DEBUG: ow_com_close.c:(42) Unimplemented!!!
CONNECT: owlib.c:(145) Cannot detect an i2c DS2482-x00 on /dev/i2c-1
DEFAULT: owlib.c:(52) No valid 1-wire buses found
  DEBUG: ow_exit.c:(17) Exit code = 1
   CALL: ow_lib_close.c:(21) Starting Library cleanup
   CALL: ow_lib_stop.c:(22) Clear Cache
  DEBUG: ow_cache.c:(295) Flipping cache tree (purging timed-out data)
  DEBUG: ow_cache.c:(313) flip cache. tdestroy() will be called.
  DEBUG: ow_cache.c:(295) Flipping cache tree (purging timed-out data)
  DEBUG: ow_cache.c:(313) flip cache. tdestroy() will be called.
   CALL: ow_lib_stop.c:(24) Closing input devices
   CALL: ow_lib_stop.c:(26) Closing output devices
   CALL: ow_lib_close.c:(42) Finished Library cleanup
  DEBUG: ow_lib_close.c:(50) Libraries closed

Is there any other way to check what happened or whether or not the board is working correctly?

[root@1-wire ~]# cat /boot/config.txt | grep dtparam
dtparam=i2c_arm=on
#dtparam=i2s=on
dtparam=spi=off
dtparam=audio=on

[root@1-wire ~]# cat /boot/cmdline.txt 
console=tty1 root=PARTUUID=07a63d15-02 fsck.repair=yes rootwait dtparam=i2c_baudrate=400000

[root@1-wire ~]# i2cdetect -l
i2c-20	i2c       	Broadcom STB :                  	I2C adapter
i2c-1	i2c       	bcm2835 (i2c@7e804000)          	I2C adapter
i2c-21	i2c       	Broadcom STB :                  	I2C adapter

[root@1-wire ~]# raspi-config nonint get_i2c
0

regards Lutz

OK, so I disconnected all cables from the board and reset all components and the Pi...
now everything seems to be working again...
but unfortunately I don't know what or why it happened...

Hello Lutz

If the board started working again after a reset it may have been a software bug in owfs or the i2c driver that caused the I2C bus to stop responding. Normally if it was a hardware fault the board would not appear on i2cdetect.

If it happens again try running "sudo apt-get update" and "sudo apt-get upgrade" to check for a newer version of owfs.