What cape did you load?
When I reboot, I see as you did
>: ls -als /sys/bus/iio/devices/
total 0
0 drwxr-xr-x 2 root root 0 Dec 31 1999 .
0 drwxr-xr-x 4 root root 0 Dec 31 1999 ..
0 lrwxrwxrwx 1 root root 0 Dec 31 1999 iio_sysfs_trigger ->
../../../devices/iio_sysfs_trigger
After I
echo cape-bone-iio > /sys/devices/bone_capemgr.9/slots
then I see
>: ls -als /sys/bus/iio/devices/
total 0
0 drwxr-xr-x 2 root root 0 Dec 31 1999 .
0 drwxr-xr-x 4 root root 0 Dec 31 1999 ..
0 lrwxrwxrwx 1 root root 0 Feb 26 10:07 iio:device0 ->
../../../devices/ocp.3/44e0d000.tscadc/tiadc/iio:device0
0 lrwxrwxrwx 1 root root 0 Dec 31 1999 iio_sysfs_trigger ->
../../../devices/iio_sysfs_trigger
and
>: cat /sys/devices/bone_capemgr.9/slots
0: 54:PF---
1: 55:PF---
2: 56:PF---
3: 57:PF---
4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G
5: ff:P-O-- Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI
6: ff:P-O-- Bone-Black-HDMIN,00A0,Texas Instrument,BB-BONELT-HDMIN
7: ff:P-O-L Override Board Name,00A0,Override Manuf,cape-bone-iio
Chad
On 2/26/2015 4:03 AM, [email protected] wrote:
Hi,
How come in my system, there is no /sys/bus/iio/devices/iio:device0?
Under /sys/bus/iio/devices/, there is only one file iio_sysfs_trigger,
which is a symbolic link to some other directory.
Is there any configuration I need to do?
I am using the latest BB black Rev C by Element14. It is OS is
3.8.13-bone47.
Thx.
On Wednesday, February 25, 2015 at 8:36:18 PM UTC+8,
[email protected] wrote:
Thanks for the suggestion. I'll keep that in mind if I need higher
sampling rates. However, I did find a way to read ADC through IIO
so that it doesn't hang.
First set up the channels and the buffer through sysfs:
echo 1 >
/sys/bus/iio/devices/iio\:device0/scan_elements/in_voltage0_en
echo 256 > /sys/bus/iio/devices/iio\:device0/buffer/length
echo 1 > /sys/bus/iio/devices/iio\:device0/buffer/enable
and then read from /dev/iio:device0. This way I can achieve about
8 kHz sampling rate with a single channel, 4 kHz with two channels
and down to ~300 Hz with all eight channels.
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