Rust - Sound Intensity Bricklet

This is the description of the Rust API bindings for the Sound Intensity Bricklet. General information and technical specifications for the Sound Intensity Bricklet are summarized in its hardware description.

An installation guide for the Rust API bindings is part of their general description. Additional documentation can be found on docs.rs.

Examples

The example code below is Public Domain (CC0 1.0).

Simple

Download (example_simple.rs)

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use std::{error::Error, io};

use tinkerforge::{ip_connection::IpConnection, sound_intensity_bricklet::*};

const HOST: &str = "localhost";
const PORT: u16 = 4223;
const UID: &str = "XYZ"; // Change XYZ to the UID of your Sound Intensity Bricklet.

fn main() -> Result<(), Box<dyn Error>> {
    let ipcon = IpConnection::new(); // Create IP connection.
    let si = SoundIntensityBricklet::new(UID, &ipcon); // Create device object.

    ipcon.connect((HOST, PORT)).recv()??; // Connect to brickd.
                                          // Don't use device before ipcon is connected.

    // Get current intensity.
    let intensity = si.get_intensity().recv()?;
    println!("Intensity: {}", intensity);

    println!("Press enter to exit.");
    let mut _input = String::new();
    io::stdin().read_line(&mut _input)?;
    ipcon.disconnect();
    Ok(())
}

Callback

Download (example_callback.rs)

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use std::{error::Error, io, thread};
use tinkerforge::{ip_connection::IpConnection, sound_intensity_bricklet::*};

const HOST: &str = "localhost";
const PORT: u16 = 4223;
const UID: &str = "XYZ"; // Change XYZ to the UID of your Sound Intensity Bricklet.

fn main() -> Result<(), Box<dyn Error>> {
    let ipcon = IpConnection::new(); // Create IP connection.
    let si = SoundIntensityBricklet::new(UID, &ipcon); // Create device object.

    ipcon.connect((HOST, PORT)).recv()??; // Connect to brickd.
                                          // Don't use device before ipcon is connected.

    let intensity_receiver = si.get_intensity_callback_receiver();

    // Spawn thread to handle received callback messages.
    // This thread ends when the `si` object
    // is dropped, so there is no need for manual cleanup.
    thread::spawn(move || {
        for intensity in intensity_receiver {
            println!("Intensity: {}", intensity);
        }
    });

    // Set period for intensity receiver to 0.05s (50ms).
    // Note: The intensity callback is only called every 0.05 seconds
    //       if the intensity has changed since the last call!
    si.set_intensity_callback_period(50);

    println!("Press enter to exit.");
    let mut _input = String::new();
    io::stdin().read_line(&mut _input)?;
    ipcon.disconnect();
    Ok(())
}

Threshold

Download (example_threshold.rs)

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use std::{error::Error, io, thread};
use tinkerforge::{ip_connection::IpConnection, sound_intensity_bricklet::*};

const HOST: &str = "localhost";
const PORT: u16 = 4223;
const UID: &str = "XYZ"; // Change XYZ to the UID of your Sound Intensity Bricklet.

fn main() -> Result<(), Box<dyn Error>> {
    let ipcon = IpConnection::new(); // Create IP connection.
    let si = SoundIntensityBricklet::new(UID, &ipcon); // Create device object.

    ipcon.connect((HOST, PORT)).recv()??; // Connect to brickd.
                                          // Don't use device before ipcon is connected.

    // Get threshold receivers with a debounce time of 1 second (1000ms).
    si.set_debounce_period(1000);

    let intensity_reached_receiver = si.get_intensity_reached_callback_receiver();

    // Spawn thread to handle received callback messages.
    // This thread ends when the `si` object
    // is dropped, so there is no need for manual cleanup.
    thread::spawn(move || {
        for intensity_reached in intensity_reached_receiver {
            println!("Intensity: {}", intensity_reached);
        }
    });

    // Configure threshold for intensity "greater than 2000".
    si.set_intensity_callback_threshold('>', 2000, 0);

    println!("Press enter to exit.");
    let mut _input = String::new();
    io::stdin().read_line(&mut _input)?;
    ipcon.disconnect();
    Ok(())
}

API

To allow non-blocking usage, nearly every function of the Rust bindings returns a wrapper around a mpsc::Receiver. To block until the function has finished and get your result, call one of the receiver's recv variants. Those return either the result sent by the device, or any error occured.

Functions returning a result directly will block until the device has finished processing the request.

All functions listed below are thread-safe, those which return a receiver are lock-free.

Basic Functions

pub fn SoundIntensityBricklet::new(uid: &str, ip_connection: &IpConnection) → SoundIntensityBricklet

Creates a new SoundIntensityBricklet object with the unique device ID uid and adds it to the IPConnection ipcon:

This device object can be used after the IP connection has been connected (see examples above).

pub fn SoundIntensityBricklet::get_intensity(&self) → ConvertingReceiver<u16>

Returns the current sound intensity. The value has a range of 0 to 4095.

The value corresponds to the upper envelop of the signal of the microphone capsule.

If you want to get the intensity periodically, it is recommended to use the SoundIntensityBricklet::get_intensity_callback_receiver callback and set the period with SoundIntensityBricklet::set_intensity_callback_period.

Advanced Functions

pub fn SoundIntensityBricklet::get_api_version(&self) → [u8; 3]

Returns the version of the API definition (major, minor, revision) implemented by this API bindings. This is neither the release version of this API bindings nor does it tell you anything about the represented Brick or Bricklet.

pub fn SoundIntensityBricklet::get_response_expected(&mut self, function_id: u8) → bool

Returns the response expected flag for the function specified by the function ID parameter. It is true if the function is expected to send a response, false otherwise.

For getter functions this is enabled by default and cannot be disabled, because those functions will always send a response. For callback configuration functions it is enabled by default too, but can be disabled by SoundIntensityBricklet::set_response_expected. For setter functions it is disabled by default and can be enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is send and errors are silently ignored, because they cannot be detected.

See SoundIntensityBricklet::set_response_expected for the list of function ID constants available for this function.

pub fn SoundIntensityBricklet::set_response_expected(&mut self, function_id: u8, response_expected: bool) → ()

Changes the response expected flag of the function specified by the function ID parameter. This flag can only be changed for setter (default value: false) and callback configuration functions (default value: true). For getter functions it is always enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is send and errors are silently ignored, because they cannot be detected.

The following function ID constants are available for this function:

  • SOUND_INTENSITY_BRICKLET_FUNCTION_SET_INTENSITY_CALLBACK_PERIOD = 2
  • SOUND_INTENSITY_BRICKLET_FUNCTION_SET_INTENSITY_CALLBACK_THRESHOLD = 4
  • SOUND_INTENSITY_BRICKLET_FUNCTION_SET_DEBOUNCE_PERIOD = 6
pub fn SoundIntensityBricklet::set_response_expected_all(&mut self, response_expected: bool) → ()

Changes the response expected flag for all setter and callback configuration functions of this device at once.

pub fn SoundIntensityBricklet::get_identity(&self) → ConvertingReceiver<Identity>

Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

The position can be 'a', 'b', 'c' or 'd'.

The device identifier numbers can be found here. There is also a constant for the device identifier of this Bricklet.

Callback Configuration Functions

pub fn SoundIntensityBricklet::set_intensity_callback_period(&self, period: u32) → ConvertingReceiver<()>

Sets the period in ms with which the SoundIntensityBricklet::get_intensity_callback_receiver callback is triggered periodically. A value of 0 turns the callback off.

The SoundIntensityBricklet::get_intensity_callback_receiver callback is only triggered if the intensity has changed since the last triggering.

The default value is 0.

pub fn SoundIntensityBricklet::get_intensity_callback_period(&self) → ConvertingReceiver<u32>

Returns the period as set by SoundIntensityBricklet::set_intensity_callback_period.

pub fn SoundIntensityBricklet::set_intensity_callback_threshold(&self, option: char, min: u16, max: u16) → ConvertingReceiver<()>

Sets the thresholds for the SoundIntensityBricklet::get_intensity_reached_callback_receiver callback.

The following options are possible:

Option Description
'x' Callback is turned off
'o' Callback is triggered when the intensity is outside the min and max values
'i' Callback is triggered when the intensity is inside the min and max values
'<' Callback is triggered when the intensity is smaller than the min value (max is ignored)
'>' Callback is triggered when the intensity is greater than the min value (max is ignored)

The default value is ('x', 0, 0).

The following constants are available for this function:

  • SOUND_INTENSITY_BRICKLET_THRESHOLD_OPTION_OFF = 'x'
  • SOUND_INTENSITY_BRICKLET_THRESHOLD_OPTION_OUTSIDE = 'o'
  • SOUND_INTENSITY_BRICKLET_THRESHOLD_OPTION_INSIDE = 'i'
  • SOUND_INTENSITY_BRICKLET_THRESHOLD_OPTION_SMALLER = '<'
  • SOUND_INTENSITY_BRICKLET_THRESHOLD_OPTION_GREATER = '>'
pub fn SoundIntensityBricklet::get_intensity_callback_threshold(&self) → ConvertingReceiver<IntensityCallbackThreshold>

Returns the threshold as set by SoundIntensityBricklet::set_intensity_callback_threshold.

The following constants are available for this function:

  • SOUND_INTENSITY_BRICKLET_THRESHOLD_OPTION_OFF = 'x'
  • SOUND_INTENSITY_BRICKLET_THRESHOLD_OPTION_OUTSIDE = 'o'
  • SOUND_INTENSITY_BRICKLET_THRESHOLD_OPTION_INSIDE = 'i'
  • SOUND_INTENSITY_BRICKLET_THRESHOLD_OPTION_SMALLER = '<'
  • SOUND_INTENSITY_BRICKLET_THRESHOLD_OPTION_GREATER = '>'
pub fn SoundIntensityBricklet::set_debounce_period(&self, debounce: u32) → ConvertingReceiver<()>

Sets the period in ms with which the threshold callback

is triggered, if the thresholds

keeps being reached.

The default value is 100.

pub fn SoundIntensityBricklet::get_debounce_period(&self) → ConvertingReceiver<u32>

Returns the debounce period as set by SoundIntensityBricklet::set_debounce_period.

Callbacks

Callbacks can be registered to receive time critical or recurring data from the device. The registration is done with the corresponding get_*_callback_receiver function, which returns a receiver for callback events.

Note

Using callbacks for recurring events is always preferred compared to using getters. It will use less USB bandwidth and the latency will be a lot better, since there is no round trip time.

pub fn SoundIntensityBricklet::get_intensity_callback_receiver(&self) → ConvertingCallbackReceiver<u16>

Receivers created with this function receive Intensity events.

This callback is triggered periodically with the period that is set by SoundIntensityBricklet::set_intensity_callback_period. The received variable is the intensity of the sensor.

The SoundIntensityBricklet::get_intensity_callback_receiver callback is only triggered if the intensity has changed since the last triggering.

pub fn SoundIntensityBricklet::get_intensity_reached_callback_receiver(&self) → ConvertingCallbackReceiver<u16>

Receivers created with this function receive Intensity Reached events.

This callback is triggered when the threshold as set by SoundIntensityBricklet::set_intensity_callback_threshold is reached. The received variable is the intensity of the encoder.

If the threshold keeps being reached, the callback is triggered periodically with the period as set by SoundIntensityBricklet::set_debounce_period.

Constants

SoundIntensityBricklet::DEVICE_IDENTIFIER

This constant is used to identify a Sound Intensity Bricklet.

The SoundIntensityBricklet::get_identity function and the IpConnection::get_enumerate_callback_receiver callback of the IP Connection have a device_identifier parameter to specify the Brick's or Bricklet's type.

SoundIntensityBricklet::DEVICE_DISPLAY_NAME

This constant represents the human readable name of a Sound Intensity Bricklet.