h3lis331dl trigger and data

[CHRISTOA]

Hi,

I am using h3lis331dl accelerometer with imx8mp and also using the default st_accel and st_accel_i2c drivers in Linux. Most of the part works correctly. 

I am using udevadm to monitor the trigger in C# code.

/bin/udevadm monitor iio:device0

This works when I manually trigger with the command "sudo udevadm trigger /sys/bus/iio/devices/iio:device0"

Is it the right way to monitor the trigger/interrupt?

Also, in_accel_*_raw and in_accel_*_scale files are available in /sys/bus/iio/devices/iio:device0 directory. How can I calculate the acceleration with the raw, scale and mount_matrix? 

Could someone please help me?

Here is the device tree node:

accelerometer@19 {

compatible = "st,h3lis331dl-accel"; 

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_accel>;

reg = <0x19>;

        st,drdy-int-pin = <1>;

vdd-supply = <&reg_board>;

vddio-supply = <&reg_board>; 

interrupt-parent = <&gpio3>;

interrupts = <29 IRQ_TYPE_LEVEL_HIGH>, <28 IRQ_TYPE_LEVEL_HIGH>;

};

Thanks

Chris

[Federica Bossi]

Hi @CHRISTOA ,

The drivers you are using are not ours and thus we can't support you.

However you can look at those and I can help you if you have any further questions.

[CHRISTOA]

Hi @Federica Bossi,

Thank you for your help. I have included your drivers into our Yocto build and now h3lis331dl (st_h3lis331dl, st_h3lis331dl_i2c, st_h3lis331dl_spi) drivers are loading correctly.

Also, I am able to read the data. But I am getting the interrupt continuously. I am getting the interrupt only once during startup and after that nothing happens.

Here is my device tree:

accelerometer@19 {

compatible = "st,h3lis331dl";

reg = <0x19>;

        st,drdy-int-pin = <1>;

vdd-supply = <&reg_board>;

vddio-supply = <&reg_board>; 

interrupt-parent = <&gpio4>;

interrupts = <24 IRQ_TYPE_EDGE_FALLING>, <26 IRQ_TYPE_EDGE_FALLING>;

};

Sample C# Code:

_i2cDevice = I2cDevice.Create(new I2cConnectionSettings(ACCELEROMETER_I2C_BUS, ACCELEROMETER_I2C_REGISTER));

_i2cDevice?.Write(new byte[] { 0x25, 0x02 });
_i2cDevice?.Write(new byte[] { 0x20, 0x57 });
_i2cDevice?.Write(new byte[] { 0x22, 0x40 });
_i2cDevice?.Write(new byte[] { 0x23, 0x00 });
_i2cDevice?.Write(new byte[] { 0x24, 0x08 });
_i2cDevice?.Write(new byte[] { 0x33, 0x02 });
_i2cDevice?.Write(new byte[] { 0x32, 0x01 });
_i2cDevice?.Write(new byte[] { 0x30, 0x2a });

_gpioController = new(PinNumberingScheme.Logical, new LibGpiodDriver(3));
_gpioController.OpenPin(ACCELEROMETER_GPIO_PIN, PinMode.Input);
_gpioController.RegisterCallbackForPinValueChangedEvent(ACCELEROMETER_GPIO_PIN, PinEventTypes.Falling | PinEventTypes.Rising, PinChangeEventHandler);

private void PinChangeEventHandler(object sender, PinValueChangedEventArgs pinValueChangedEventArgs)
{
_logger.LogInformation($"AccelerometerService::PinChangeEventHandler:{pinValueChangedEventArgs.ChangeType}");

if (pinValueChangedEventArgs.ChangeType == PinEventTypes.Rising)
{
try
{
Vector3 acceleration = (Vector3)_accelerometer?.Acceleration;
_accel = Math.Sqrt(acceleration.X * acceleration.X + acceleration.Y * acceleration.Y + acceleration.Z * acceleration.Z);
_logger.LogInformation($"X:{acceleration.X:0.0000} Y:{acceleration.Y:0.0000} Z:{acceleration.Z:0.0000} G:{_accel:0.0000}".PadRight(30));
}
catch (Exception e)
{
_logger.LogInformation(e.Message);
}
}
else
{
_logger.LogInformation("AccelerometerService::PinChangeEventHandler Released");
}
}

Can you please help me how to get the interrupt correctly?

Thanks

Chris