[Owfs-developers] DS18B20 returns "Invalid Argument" when Reading Temperature

[Daryl]

Hello,   I’ve set up a small test network using owfs and am finding it quite useful. I plan on integrating with the diy-zoning software for furnace control of a church building. I’ve tried a few devices and they are functioning quite well. However I am having trouble with the DS18B20.   I am able to read and control a DS2406 and a DS2502 using a serial (DS9097U) adapter. My trouble is only with the DS18B20. I’ve tried two different computers and two different sensors with the same results. They work with digitemp but not with owfs. Reading the device properties works fine, but asking for the temperature returns an error as shown here:   [EMAIL PROTECTED] 28.053FAA000000]# cat id [EMAIL PROTECTED] 28.053FAA000000]# cat type [EMAIL PROTECTED] 28.053FAA000000]# [EMAIL PROTECTED] 28.053FAA000000]# cat temperature cat: temperature: Invalid argument   After the error is returned all devices disappear from the bus until owfs is restarted.   My setup is like this: tested under FC1 (kernel 2.4.22) and FC2 (kernel 2.6.10). using the latest cvs version of owfs together with fuse-2.4.2 . tested with owhttpd and owfs file system and both get a similar error parasitically powered bus running off of a DS9097U sensor: DS18B20 in TO-92 package with two leads connected to the bus short cables (<20 feet) owfs started with: owfs -C --error_level 3 --foreground -d /dev/ttyS0 /mnt/1wire   I’d appreciate any pointers you can provide on debugging this problem. Recommendations on stable code versions, etc. would be helpful. For logs see below. Thanks, Daryl     Hardware functioning correctly with digitemp:   [EMAIL PROTECTED] root]# digitemp_DS9097U -t 0 -n 3 DigiTemp v3.3.2 Copyright 1996-2004 by Brian C. Lane GNU Public License v2.0 - http://www.brianlane.com Dec 28 13:40:05 Sensor 0 C: 12.94 F: 55.29 Dec 28 13:40:06 Sensor 0 C: 12.94 F: 55.29 Dec 28 13:40:07 Sensor 0 C: 12.94 F: 55.29   This is the debug log when reading through the owfs file system:   <bus operating normally, reading other devices, looking at device id>   INFO: GETDIR path=/28.053FAA000000 INFO: PARSENAME path=[/28.053FAA000000] INFO: DIRECTORY path=/28.053FAA000000 INFO: FSTAT path=/28.053FAA000000/id INFO: PARSENAME path=[/28.053FAA000000/id] INFO: ATTRIBUTES path=/28.053FAA000000/id INFO: OPEN path=/28.053FAA000000/id INFO: READ path=/28.053FAA000000/id size=4096 offset=0 INFO: PARSENAME path=[/28.053FAA000000/id] INFO: FS_parse_read: format=5 s=4096 offset=0 INFO: RELEASE path=/28.053FAA000000/id   <read temperature here with cat temperature>   INFO: FSTAT path=/28.053FAA000000/temperature INFO: PARSENAME path=[/28.053FAA000000/temperature] INFO: ATTRIBUTES path=/28.053FAA000000/temperature INFO: OPEN path=/28.053FAA000000/temperature INFO: READ path=/28.053FAA000000/temperature size=4096 offset=0 INFO: PARSENAME path=[/28.053FAA000000/temperature] INFO: FS_parse_read: format=10 s=4096 offset=0 INFO: READ path=/28.053FAA000000/temperature size=4096 offset=0 INFO: PARSENAME path=[/28.053FAA000000/temperature] INFO: FS_parse_read: format=10 s=4096 offset=0 INFO: PARSENAME path=[] INFO: DS2480 reset error INFO: Failed to reconnect DS2480 adapter! INFO: BUS_selection_error: reconnect error = -5 INFO: RELEASE path=/28.053FAA000000/temperature     This is what I get from reading the owhttpd web page for this device: 28.053FAA000000 uncached version up directory address 28053FAA000000AC crc8 AC die C2 family 28 fasttemp Error: Invalid argument id 053FAA000000 power NO present NO temperature Error: Invalid argument temphigh Error: Invalid argument templow Error: Invalid argument trim Error: Invalid argument trimblanket Error: Invalid argument trimvalid Error: Invalid argument type DS18B20