Hi,
I reference the Docs and ADC Driver's Guide to run ADC in continue mode. However, I can't find "/dev/iio:device0".
Our goal is to read ADC value every 10us in C.
===========================Log start==============================================
/ # ls -l /sys/bus/iio/devices/iio\:device0/buffer/
total 0
-rw-r--r-- 1 root 0 4096 Jan 1 01:36 enable
-rw-r--r-- 1 root 0 4096 Jan 1 01:36 length
-rw-r--r-- 1 root 0 4096 Jan 1 01:36 watermark
/ # ls -al /sys/bus/iio/devices/iio\:device0/scan_elements/
total 0
drwxr-xr-x 2 root 0 0 Jan 1 01:37 .
drwxr-xr-x 5 root 0 0 Jan 1 01:36 ..
-rw-r--r-- 1 root 0 4096 Jan 1 01:37 in_voltage0_en
-r--r--r-- 1 root 0 4096 Jan 1 01:37 in_voltage0_index
-r--r--r-- 1 root 0 4096 Jan 1 01:37 in_voltage0_type
/ # cat /sys/bus/iio/devices/iio\:device0/scan_elements/in_voltage0_type
le:u12/16>>0
/ # echo 1 > /sys/bus/iio/devices/iio\:device0/scan_elements/in_voltage0_en
/ # echo 100 > /sys/bus/iio/devices/iio\:device0/buffer/length
/ # echo 1 > /sys/bus/iio/devices/iio\:device0/buffer/enable
/ # /mnt/iio_generic_buffer -N 0 -g
iio device number being used is 0
trigger-less mode selected
Failed to open /dev/iio:device0
/ # cat /sys/bus/iio/devices/iio\:device0/in_voltage0_raw
cat: read error: Device or resource busy
/ # echo 0 > /sys/bus/iio/devices/iio\:device0/buffer/enable
/ # cat /sys/bus/iio/devices/iio\:device0/in_voltage0_raw
1656
===========================Log end===============================================
SDK Version: 04.02.00.09
Kernel version: Linux liteon 4.9.59 #153 PREEMPT Wed Mar 11 08:58:57 CST 2020 armv7l GNU/Linux
DTS:
&tscadc {
status = "okay";
adc {
ti,adc-channels = <0>;
ti,chan-step-opendelay = <0x0>;
ti,chan-step-sampledelay = <0x1>;
ti,chan-step-avg = <0>;
};
};
Thanks
