Under Debian 8, the external I2C bus is now I2C-2. I2C-1 is internal only, and used for talking to the PMIC and things like that. Don't use it, unless you really understand what you are doing. --- Graham
== On Fri, Mar 10, 2017 at 8:08 AM, christ christ <mamanechri...@gmail.com> wrote: > Hi Graham, > I have been using the latest version of Debien, for three days now with > the same result. > On the other hand i checked with the oscilloscope the SDA and SCL lines > are not acting like they are supposed to act (even on the default P9_19 and > P9_20). > > Thought maybe they all need to be enable.Tried the following method but in > vain (NO such file or directory is the response i'm getting) > *To enable the I2c-1 on the BeagleBone Black Rev A, B and C:* > > 1. Rev A/B: Open the file /media/BEAGLEBONE/uEnv.txt in an editor > (vim/nano) > 2. Rec C: Open the file /boot/uboot/uEnv.txt in an editor (vim/nano) > 3. Add the key "capemgr.enable_partno=" > 4. Add the ports you want to enable, comma separated (BB-I2C0, > BB-I2C1, etc) > 5. Reboot. > > Am i right to say the I2c buses are not enable? or is it another proble? > > On Thu, Mar 9, 2017 at 4:25 PM, Graham <gra...@flex-radio.com> wrote: > >> Then it is not wired or connected correctly. >> Put an oscilloscope on the data and clock lines and see if they are doing >> what they are supposed to do. >> It also looks like you are using an old version of the OS. >> Move to Debian 8, and you should see the I2C devices on bus 2. >> Hook the I2C Clock to P9-19. Hook the I2C data to P9-20. >> You should not have to mess with the device tree or pin configuration. >> Power and ground also required. >> >> --- Graham >> >> == >> >> On Thursday, March 9, 2017 at 6:52:04 AM UTC-6, christ christ wrote: >>> >>> The MPU-9250 breakout from spark fun come with pull up resistors. >>> >>> On 09 Mar 2017 00:42, "Graham" <gra...@flex-radio.com> wrote: >>> >>>> Something is not wired right. >>>> Did you put pull-up resistors on the I2C lines? >>>> --- Graham >>>> >>>> == >>>> >>>> On Wednesday, March 8, 2017 at 12:02:04 PM UTC-6, mamane...@gmail.com >>>> wrote: >>>>> >>>>> Hi Guys, >>>>> >>>>> I’m struggling to get the device address (MPU-9250). i got to the >>>>> following stage: >>>>> >>>>> >>>>> root@beaglebone:~# sudo i2cdetect -r 0 >>>>> WARNING! This program can confuse your I2C bus, cause data loss and >>>>> worse! >>>>> I will probe file /dev/i2c-0 using read byte commands. >>>>> I will probe address range 0x03-0x77. >>>>> Continue? [Y/n] y >>>>> 0 1 2 3 4 5 6 7 8 9 a b c d e f >>>>> 00: — — — — — — — — — — — — — >>>>> 10: — — — — — — — — — — — — — — — — >>>>> 20: — — — — UU — — — — — — — — — — — >>>>> 30: — — — — UU — — — — — — — — — — — >>>>> 40: — — — — — — — — — — — — — — — — >>>>> 50: UU — — — — — — — — — — — — — — — >>>>> 60: — — — — — — — — — — — — — — — — >>>>> 70: UU — — — — — — — >>>>> root@beaglebone:~# sudo i2cdetect -r 1 >>>>> WARNING! This program can confuse your I2C bus, cause data loss and >>>>> worse! >>>>> I will probe file /dev/i2c-1 using read byte commands. >>>>> I will probe address range 0x03-0x77. >>>>> Continue? [Y/n] y >>>>> 0 1 2 3 4 5 6 7 8 9 a b c d e f >>>>> 00: — — — — — — — — — — — — — >>>>> 10: — — — — — — — — — — — — — — — — >>>>> 20: — — — — — — — — — — — — — — — — >>>>> 30: — — — — — — — — — — — — — — — — >>>>> 40: — — — — — — — — — — — — — — — — >>>>> 50: — — — — UU UU UU UU — — — — — — — — >>>>> 60: — — — — — — — — — — — — — — — — >>>>> 70: — — — — — — — — >>>>> >>>>> >>>>> But even after connecting my device It is still the same (I mean it >>>>> still doesn't show the device's address). Any advise? >>>>> >>>>> Thanks >>>>> >>>> > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CANN_KV5OQzLvi9ckb%3D8yDKubQbbCQri8t-VO4aEVe4zSx2O64Q%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
