asm330lhhxg1 can't read any buffer data with iio_generic_buffer

[Alyson Chen]

Hi,

I'm porting the asm330lhhxg1 on my embedded system device(Linux/arm 4.9.257). I am attempting to use the IIO buffer to continuously read data at its sampling_frequency. However, the process seems to be stuck as shown below:

# Enable Y-axis acceleration
echo 1 > /sys/bus/iio/devices/iio:device2/scan_elements/in_accel_y_en

# Enable X-axis acceleration
echo 1 > /sys/bus/iio/devices/iio:device2/scan_elements/in_accel_x_en

# Enable timestamp
echo 1 > /sys/bus/iio/devices/iio:device2/scan_elements/in_timestamp_en

# Enable Z-axis acceleration
echo 1 > /sys/bus/iio/devices/iio:device2/scan_elements/in_accel_z_en

# Attempt to enable buffer
echo 1 > /sys/bus/iio/devices/iio:device2/buffer/enable

# Run generic buffer utility
./iio_generic_buffer -a -g -n asm330lhhx_accel
# Output from incomplete command
  iio device number being used is 2
  trigger-less mode selected
  Auto-channels selected but some channels are already activated in sysfs
  Proceeding without activating any channels
##stuck here

#Here is my device tree configuration under `i2c0`:

&i2c0 {
   asm330lhhx-imu@0x6b {
        compatible = "st,asm330lhhx";
        reg = <0x6b>;
        interrupt-parent = <&gpio0>;
        interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
        /*vddio-supply = <&sensors_vddio>;*/
        /*vdd-supply = <&sensors_vdd>;*/
	    drive-open-drain;
        st,int-pin = <1>;
        st,mlc-int-pin = <2>;
        mount-matrix = "1", "0", "0",
                   "0", "1", "0",
                   "0", "0", "1";
        };
    }

Here is the output similar to the content on this webpage:

root@tegra-ubuntu:~# ./iio_generic_buffer -a -c 10 --device-name accelerometer -g
iio device number being used is 2
trigger-less mode selected
scan element filename:/sys/bus/iio/devices/iio:device2/scan_elements/in_accel_y_en , enabled:0
scan element filename:/sys/bus/iio/devices/iio:device2/scan_elements/in_accel_x_en , enabled:0
scan element filename:/sys/bus/iio/devices/iio:device2/scan_elements/in_timestamp_en , enabled:0
scan element filename:/sys/bus/iio/devices/iio:device2/scan_elements/in_accel_z_en , enabled:0
No channels are enabled, enabling all channels
Enabling: in_accel_y_en
Enabling: in_accel_x_en
Enabling: in_timestamp_en
Enabling: in_accel_z_en
scan element filename:/sys/bus/iio/devices/iio:device2/scan_elements/in_accel_y_en , enabled:1
scan element filename:/sys/bus/iio/devices/iio:device2/scan_elements/in_accel_x_en , enabled:1
scan element filename:/sys/bus/iio/devices/iio:device2/scan_elements/in_timestamp_en , enabled:1
scan element filename:/sys/bus/iio/devices/iio:device2/scan_elements/in_accel_z_en , enabled:1
buffer directory: /sys/bus/iio/devices/iio:device2/buffer
X Axis   Y Axis    Z Axis   Timestamp [This row is not present in the output]
-9.484633 -0.103250 1.109713 4515182411776
-9.560051 -0.098761 1.115998 4515261579264
-9.547482 -0.096965 1.116896 4515340746752
-9.543890 -0.092476 1.117793 4515419914240
-9.547482 -0.096067 1.112406 4515499606016
-9.542993 -0.096965 1.112406 4515578773504
-9.550175 -0.107739 1.112406 4515657940992
-9.548379 -0.105046 1.115100 4515737108480
-9.540298 -0.101454 1.109713 4515816275968
-9.545686 -0.095170 1.116896 4515895443456
Disabling: in_accel_y_en
Disabling: in_accel_x_en
Disabling: in_timestamp_en
Disabling: in_accel_z_en

I expected to see information similar to what's on the webpage, but it did not appear.

[Mario Tesi]

Hi AlysonQ,

We kindly ask you to consider that this project has been discontinued, therefore we recommend you to switch to the new IIO project st-mems-android-linux-drivers-iio which will soon also support the asm330lhhxg1 device.
In this new project the IIO drivers support continuously data reading via buffer and are constantly updated.