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
>
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