Christian Magnusson <mag <at> mag.cx> writes:
> You can download the packages from my temporary repository if you want at: > http://home.mag.cx/nslu2/packages/ > > owfs_2.6p5-15_armeb.ipk > owlib_2.6p5-15_armeb.ipk > > This new version defaults into flexible speed, which makes it possible to > set the slewrate to a lower value than 15V/us. > This should lower the risk to get signal-distortion in the cables, > especially when it's a bigger 1-wire network. > > echo 0 > /tmp/1wire/bus.0/system/adapter/overdrive.0 for regular speed > (always 15V/us) > echo 1 > /tmp/1wire/bus.0/system/adapter/overdrive.0 for flexible speed, > slewrate tunable. > echo 2 > /tmp/1wire/bus.0/system/adapter/overdrive.0 for overdrive speed > (always 15V/us) > > Can you try this new version and tell me if your crc-errors disappears? > > Christian, after the installation of 2.65-15 version of owfs, i checked the value of /tmp/1wire/bus.0/system/adapter/overdrive.0 and i found a 0 (zero) there. Reading your posting i understand that, to be able to change the slew param, i must put a 1 on the overdrive.0 parameter. I issued a echo 1 > /tmp/1wire/bus.0/system/adapter/overdrive.0 and then i start tweeking the /tmp/1wire/bus.0/system/adapter/pulldownslewrate.0 parameter ranging from 0 up to 7. The problem is still there but the errors are changed . The output of grep -v " 0" /tmp/1wire/bus.0/statistics/errors/* is now : /tmp/1wire/bus.0/statistics/errors/BUS_select_low_errors: 24 /tmp/1wire/bus.0/statistics/errors/CRC8_tries: 5 Actually i am tweeking even the other parameter you indicated in a previous posting : writeonelowtime.0 and datasampleoffset.0, i don't see any difference on the behaviour of the NSLU2. I don't know if it make sense, i made the same test with /tmp/1wire/bus.0/system/adapter/overdrive.0 set to 0 and 2 with the same results as before. Just a little remark: as said before , my network is composed by just two devices, the Bus master and the 2408 board. The twos are connected via a short (no more than 30 cm) rj45 cable. Regards Giuliano ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
