Sorry - meant to add this link from RPi forum about running 2 i2c busses: "enable both i2c busses" http://www.raspberrypi.org/phpBB3/viewtopic.php?f=44&t=33092&p=336846#p336846
On 23 April 2013 10:06, Julian Brooks <[email protected]> wrote: > Bit more digging re ic switch: > My understanding is that if we got one of these: > > http://uk.farnell.com/roth-elektronik/re933-03/adaptor-smd-tssop-16-0-65mm/dp/1426182 > and one of these: > http://uk.farnell.com/nxp/pca9546apw/ic-switch-4ch-i2c-16tssop/dp/2212120 > we should in theory be able to run both sensors off the same pins? > BUT - would the current code you wrote function better/easier if the > sensors were run from 2 separate sets of pins - ie how to parse the info > from one patch sounds tricky and presume much simpler with 2 [netreceive] > objects attached to 2 C files? > > J > > > On 23 April 2013 09:42, Julian Brooks <[email protected]> wrote: > >> Hey Martin / all, >> >> Omron tech support finally got back to me re the address issue, this is >> what they had to say: >> >> "D6T sensor can not change the address. >> When you connect multiple sensors we recommend that you use the IC >> switching. >> Please refer to the below document. >> >> http://media.digikey.com/pdf/Data%20Sheets/Omron%20PDFs/D6T44L_8L_Appl_Note.pdf >> " >> >> >> I've been through the spec sheet several times and don't see anything >> (admittedly not sure exactly what I'm looking for though) that relates to >> IC switching. >> >> We've still got 2 of these doing nothing currently if they could be >> brought into action: >> http://adafruit.com/products/757 >> >> Or people on the RPi forum seem to have got the 2nd i2c pins going but >> that seems to be for rev.2 boards only (I think - have posted a question on >> the thread to ask). >> >> Also asked tech support about the PEC errors but no response to that one. >> >> I've noticed that the PEC doesn't trigger errors all the time so am >> wondering if it's possible to filter the errors out of the data somehow in >> the C file? >> >> Still delighted though - the sensors great! >> >> Cheers, >> >> Julian >> >> >> >> On 22 April 2013 00:20, Julian Brooks <[email protected]> wrote: >> >>> Wonder if it's a difference between rev boards on the Pi? >>> >>> I've also built a custom image based on Hexxeh's minimal install which >>> is working great for audio stuff. My Pd patch that wouldn't run without >>> overclocking on a standard Raspian is now working fine on the rev1 256mg >>> board. So I've been adding stuff as and when it comes up to try and keep t >>> is minimal as poss. >>> >>> I'm also not sure what installed libi2c-dev? Guess I'll have to wait >>> and see what squeals. >>> >>> Of possible interest is this message when removing the lib with apt-get: >>> The following packages will be REMOVED: >>> libi2c-dev >>> 0 upgraded, 0 newly installed, 1 to remove and 11 not upgraded. >>> After this operation, 19.5 kB disk space will be freed. >>> Do you want to continue [Y/n]? y >>> (Reading database ... 33610 files and directories currently installed.) >>> Removing libi2c-dev ... >>> Removing 'diversion of /usr/include/linux/i2c-dev.h to >>> /usr/include/linux/i2c-dev.h.kernel by libi2c-dev' >>> >>> So guess the diversion was messing with the compile for the C code. >>> >>> Anyway - code runs and I can compile C files too so all ok so far. >>> >>> Thanks again for everything Martin, >>> >>> Julian >>> >>> >>> >>> >>> >>> On 21 April 2013 06:45, Martin Peach <[email protected]> wrote: >>> >>>> On 2013-04-20 21:09, Julian Brooks wrote: >>>> >>>>> Oh and btw >>>>> >>>>> Still don't know why I can't compile the .c files on the pi with >>>>> libi2c-dev installed but I can't. Presuming the compiling is working >>>>> for you Martin? >>>>> >>>> >>>> Yes it works for me. I don't have the same /usr/include/linux/i2c-dev.h >>>> as you so no redefinition errors, not sure which package(s) install that >>>> file. >>>> >>>> Martin >>>> >>>> >>>> >>> >> >
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