Hello, I'm trying to work through the I2C examples in the Molloy book. But I'm using a Honeywell HMC6352 compass since I had one lying around. It can work from 2.7V to 5V and operates at a bus frequency of 100KHz. I verified that it works by hooking it up to a 5V microcontroller. I can query its registers. But I haven't had any luck communicating with it on a BeagleBone Black.
I'm using 3.9V pull-up resistors for SDA and SCL. Here is info about my kernel version, cape slots, and the I2C pins: debian@beaglebone:~$ uname -a Linux beaglebone 4.4.54-bone16 #1 Fri Mar 17 04:56:31 UTC 2017 armv7l GNU/Linux debian@beaglebone:~$ sudo cat $SLOTS 0: PF---- -1 1: PF---- -1 2: PF---- -1 3: PF---- -1 4: P-O-L- 0 Override Board Name,00A0,Override Manuf,cape-universaln debian@beaglebone:~$ config-pin -i P9.19 Pin is not modifyable: P9_19 i2c2_scl debian@beaglebone:~$ config-pin -i P9.20 Pin is not modifyable: P9_20 i2c2_sda debian@beaglebone:~$ It looks like everything is okay. Am I missing any steps? I saw some info about adding an I2C overlay. Is that still necessary with the universal cape? BTW, I also tried the *4.4.54-ti-r93* kernel without success. Thanks for any advice. This noob is stumped. :-) -- 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/d6f8e3c9-7825-4141-bae9-04c081109d1f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
