Using a DS9490, I have been running the python based Weewx weather station
software for several years on the Raspbian Wheezy OS. Unfortunately, the same
program is failing on the new Raspbian Stretch OS and can be verified with a
simple test case. Run the following program as root (to bypass any permission
issues) on the Raspbian Stretch November Release:
#!/usr/bin/python
import ow
ow.init('u')
and the test program exits with the error message:
File "/usr/lib/python2.7/dist-packages/ow/__init__.py", line 224, in init
raise exNoController
Syslog shows
Dec 7 17:33:27 wx kernel: [436943.136563] usb 1-1.5: new full-speed USB device
number 107 using dwc_otg
Dec 7 17:33:27 wx kernel: [436943.270174] usb 1-1.5: New USB device found,
idVendor=04fa, idProduct=2490
Dec 7 17:33:27 wx kernel: [436943.270189] usb 1-1.5: New USB device strings:
Mfr=0, Product=0, SerialNumber=0
Dec 7 17:33:27 wx mtp-probe: checking bus 1, device 107:
"/sys/devices/platform/soc/3f98.usb/usb1/1-1/1-1.5"
Dec 7 17:33:27 wx mtp-probe: bus: 1, device: 107 was not an MTP device
and after running the above test program:
Dec 11 07:05:46 wx OWFS[30742]: DEFAULT: owlib.c:(208) Cannot open USB bus
master
Dec 11 07:05:46 wx OWFS[30742]: DEFAULT: owlib.c:(52) No valid 1-wire buses
found
For the above test, after running apt-get update and upgrade, library versions
were python-ow 3.1p5-1, libow 3.1.5.
A workaround was found by Glenn McKechnie and posted on the weewx-user Google
group:
apt-get remove libow-3.1-5 python-ow owfs-common
Build and install owfs-2.9p8
The test program now exits normally and syslog shows
Dec 15 10:19:56 wx OWFS[12631]: DEFAULT: ow_ds9490.c:(250) Unclear what <>
means in USB specification, will use first adapter.
Dec 15 10:19:56 wx OWFS[12631]: DEFAULT: ow_usb_msg.c:(292) Opened USB DS9490
bus master at 1:11.
Dec 15 10:19:56 wx OWFS[12631]: DEFAULT: ow_usb_cycle.c:(190) Set DS9490 1:11
unique id to 81 38 0F 31 00 00 00 4E
Unfortunately, I don't have a Debian Stretch system so I can't tell if this a
Debian or a Raspbian issue.--
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