Thanks for your answer. I now have some more questions. 1. Where can I find BB-ADC overlay? 2. There is no more bone_capemgr in my kernel 3.17.1-armv7-x3. They removed it and oly use "simple" Device Trees at bootup. 3. Can I use the BB-ADC overlay as DeviceTree?
Roy 2014-11-07 19:34 GMT+01:00 Chad Baker <[email protected]>: > config-pin was developed to work with gpios enabled with the > cape-universal-00A0.dtbo overlay. > To access the ADC inputs, you need to load the BB-ADC overlay. You can > then access the AIN inputs with sysfs. > > als $OCP/helper.* > ls: cannot access /sys/devices/ocp.*/helper.*: No such file or > directory > echo BB-ADC > /sys/devices/bone_capemgr.*/slots > tail -1 /sys/devices/bone_capemgr.*/slots > 7: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-ADC > als /sys/devices/ocp.*/helper.* > total 0 > 0 drwxr-xr-x 3 root root 0 Nov 7 12:28 . > 0 drwxr-xr-x 33 root root 0 May 14 21:40 .. > 0 -r--r--r-- 1 root root 4096 Nov 7 12:29 AIN0 > 0 -r--r--r-- 1 root root 4096 Nov 7 12:29 AIN1 > 0 -r--r--r-- 1 root root 4096 Nov 7 12:29 AIN2 > 0 -r--r--r-- 1 root root 4096 Nov 7 12:29 AIN3 > 0 -r--r--r-- 1 root root 4096 Nov 7 12:29 AIN4 > 0 -r--r--r-- 1 root root 4096 Nov 7 12:29 AIN5 > 0 -r--r--r-- 1 root root 4096 Nov 7 12:29 AIN6 > 0 -r--r--r-- 1 root root 4096 Nov 7 12:29 AIN7 > 0 lrwxrwxrwx 1 root root 0 Nov 7 12:29 driver -> > ../../../bus/platform/drivers/bone-iio-helper > 0 -r--r--r-- 1 root root 4096 Nov 7 12:29 modalias > 0 drwxr-xr-x 2 root root 0 Nov 7 12:29 power > 0 lrwxrwxrwx 1 root root 0 Nov 7 12:28 subsystem -> > ../../../bus/platform > 0 -rw-r--r-- 1 root root 4096 Nov 7 12:28 uevent > cat /sys/devices/ocp.*/helper.*/AIN1 > 1554 > > Chad > > Chad Baker > Professor Emeritus > Christian Brothers University > Electrical and Computer Engineering > > [email protected] > [email protected] > > > On Nov 7, 2014, at 9:58 AM, Tux Leonard <[email protected]> wrote: > > > > Hi, > > > > I am using kernel 3.17.1-armv7-x3 on my BBB and I want to read the > analog inputs available. > > > > I found this website > > https://github.com/cdsteinkuehler/beaglebone-universal-io > > for hadling gpio but I don't understand how to read analog inputs: > > P9 31-40 Analog Signals, no pinmux > > > > Could someone explain how to read these inputs? > > > > Thanks > > > > Roy > > > > -- > > 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]. > > For more options, visit https://groups.google.com/d/optout. > > -- > 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]. > For more options, visit https://groups.google.com/d/optout. > -- 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]. For more options, visit https://groups.google.com/d/optout.
