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 <[email protected]> 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" <[email protected]> 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, [email protected] >>> 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAPTvsHhB1sa-5vUFL%3DCyjVUkNwQ5y%2BoR3ynNczm66bY6DFc8VA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
