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//! A platform agnostic Rust driver for the Sensirion SGP30 gas sensor, based
//! on the [`embedded-hal`](https://github.com/japaric/embedded-hal) traits.
//!
//! ## The Device
//!
//! The Sensirion SGP30 is a low-power gas sensor for indoor air quality
//! applications with good long-term stability. It has an I²C interface with TVOC
//! (*Total Volatile Organic Compounds*) and CO₂ equivalent signals.
//!
//! - [Datasheet](https://www.sensirion.com/file/datasheet_sgp30)
//! - [Product Page](https://www.sensirion.com/sgp)
//!
//! ## Usage
//!
//! ### Instantiating
//!
//! Import this crate and an `embedded_hal` implementation, then instantiate
//! the device:
//!
//! ```no_run
//! use linux_embedded_hal as hal;
//!
//! use hal::{Delay, I2cdev};
//! use sgp30::Sgp30;
//!
//! # fn main() {
//! let dev = I2cdev::new("/dev/i2c-1").unwrap();
//! let address = 0x58;
//! let mut sgp = Sgp30::new(dev, address, Delay);
//! # }
//! ```
//!
//! ### Fetching Device Information
//!
//! You can fetch the serial number of your sensor as well as the [feature
//! set](struct.FeatureSet.html):
//!
//! ```no_run
//! # use linux_embedded_hal as hal;
//! # use hal::{Delay, I2cdev};
//! # use sgp30::Sgp30;
//! use sgp30::FeatureSet;
//!
//! # fn main() {
//! # let dev = I2cdev::new("/dev/i2c-1").unwrap();
//! # let mut sgp = Sgp30::new(dev, 0x58, Delay);
//! let serial_number: [u8; 6] = sgp.serial().unwrap();
//! let feature_set: FeatureSet = sgp.get_feature_set().unwrap();
//! # }
//! ```
//!
//! ### Doing Measurements
//!
//! Before you do any measurements, you need to initialize the sensor.
//!
//! ```no_run
//! # use linux_embedded_hal as hal;
//! # use hal::{Delay, I2cdev};
//! # use sgp30::Sgp30;
//! # fn main() {
//! # let dev = I2cdev::new("/dev/i2c-1").unwrap();
//! # let mut sgp = Sgp30::new(dev, 0x58, Delay);
//! sgp.init().unwrap();
//! # }
//! ```
//!
//! The SGP30 uses a dynamic baseline compensation algorithm and on-chip
//! calibration parameters to provide two complementary air quality signals.
//! Calling this method starts the air quality measurement. **After
//! initializing the measurement, the `measure()` method must be called in
//! regular intervals of 1 second** to ensure proper operation of the dynamic
//! baseline compensation algorithm. It is the responsibility of the user of
//! this driver to ensure that these periodic measurements are being done!
//!
//! ```no_run
//! # use linux_embedded_hal as hal;
//! # use hal::I2cdev;
//! # use sgp30::Sgp30;
//! use embedded_hal::blocking::delay::DelayMs;
//! use hal::Delay;
//! use sgp30::Measurement;
//!
//! # fn main() {
//! # let dev = I2cdev::new("/dev/i2c-1").unwrap();
//! # let mut sgp = Sgp30::new(dev, 0x58, Delay);
//! # sgp.init().unwrap();
//! loop {
//! let measurement: Measurement = sgp.measure().unwrap();
//! println!("CO₂eq parts per million: {}", measurement.co2eq_ppm);
//! println!("TVOC parts per billion: {}", measurement.tvoc_ppb);
//! Delay.delay_ms(1000u16 - 12);
//! }
//! # }
//! ```
//!
//! *(Note: In the example we're using a delay of 988 ms because the
//! measurement takes up to 12 ms according to the datasheet. In reality, it
//! would be better to use a timer-based approach instead.)*
//!
//! For the first 15 s after initializing the air quality measurement, the
//! sensor is in an initialization phase during which it returns fixed
//! values of 400 ppm CO₂eq and 0 ppb TVOC. After 15 s (15 measurements)
//! the values should start to change.
//!
//! A new init command has to be sent after every power-up or soft reset.
//!
//! ### Restoring Baseline Values
//!
//! The SGP30 provides the possibility to read and write the values of the
//! baseline correction algorithm. This feature is used to save the baseline in
//! regular intervals on an external non-volatile memory and restore it after a
//! new power-up or soft reset of the sensor.
//!
//! The [`get_baseline()`](struct.Sgp30.html#method.get_baseline) method
//! returns the baseline values for the two air quality signals. After a
//! power-up or soft reset, the baseline of the baseline correction algorithm
//! can be restored by calling [`init()`](struct.Sgp30.html#method.init)
//! followed by [`set_baseline()`](struct.Sgp30.html#method.set_baseline).
//!
//! ```no_run
//! # use linux_embedded_hal as hal;
//! # use hal::{I2cdev, Delay};
//! # use sgp30::Sgp30;
//! use sgp30::Baseline;
//!
//! # fn main() {
//! # let dev = I2cdev::new("/dev/i2c-1").unwrap();
//! # let mut sgp = Sgp30::new(dev, 0x58, Delay);
//! # sgp.init().unwrap();
//! let baseline: Baseline = sgp.get_baseline().unwrap();
//! // …
//! sgp.init().unwrap();
//! sgp.set_baseline(&baseline).unwrap();
//! # }
//! ```
//!
//! ### Humidity Compensation
//!
//! The SGP30 features an on-chip humidity compensation for the air quality
//! signals (CO₂eq and TVOC) and sensor raw signals (H2 and Ethanol). To use
//! the on-chip humidity compensation, an absolute humidity value from an
//! external humidity sensor is required.
//!
//! ```no_run
//! # use linux_embedded_hal as hal;
//! # use hal::{I2cdev, Delay};
//! # use sgp30::Sgp30;
//! use sgp30::Humidity;
//!
//! # fn main() {
//! # let dev = I2cdev::new("/dev/i2c-1").unwrap();
//! # let mut sgp = Sgp30::new(dev, 0x58, Delay);
//! // This value must be obtained from a separate humidity sensor
//! let humidity = Humidity::from_f32(23.42).unwrap();
//!
//! sgp.init().unwrap();
//! sgp.set_humidity(Some(&humidity)).unwrap();
//! # }
//! ```
//!
//! After setting a new humidity value, this value will be used by the
//! on-chip humidity compensation algorithm until a new humidity value is
//! set. Restarting the sensor (power-on or soft reset) or calling the
//! function with a `None` value sets the humidity value used for
//! compensation to its default value (11.57 g/m³) until a new humidity
//! value is sent.
#![deny(unsafe_code)]
#![deny(missing_docs)]
#![cfg_attr(not(test), no_std)]
use byteorder::{BigEndian, ByteOrder};
use embedded_hal as hal;
use sensirion_i2c::{crc8, i2c};
use crate::hal::blocking::{
delay::{DelayMs, DelayUs},
i2c::{Read, Write, WriteRead},
};
mod types;
pub use crate::types::{Baseline, FeatureSet, Humidity, Measurement, ProductType, RawSignals};
/// All possible errors in this crate
#[derive(Debug)]
pub enum Error<E> {
/// I²C bus error
I2c(E),
/// CRC checksum validation failed
Crc,
/// User tried to measure the air quality without starting the
/// initialization phase.
NotInitialized,
}
impl<E, I2cWrite, I2cRead> From<i2c::Error<I2cWrite, I2cRead>> for Error<E>
where
I2cWrite: Write<Error = E>,
I2cRead: Read<Error = E>,
{
fn from(err: i2c::Error<I2cWrite, I2cRead>) -> Self {
match err {
i2c::Error::Crc => Error::Crc,
i2c::Error::I2cWrite(e) => Error::I2c(e),
i2c::Error::I2cRead(e) => Error::I2c(e),
}
}
}
/// I²C commands sent to the sensor.
#[derive(Debug, Copy, Clone)]
enum Command {
/// Return the serial number.
GetSerial,
/// Run an on-chip self-test.
SelfTest,
/// Initialize air quality measurements.
InitAirQuality,
/// Get a current air quality measurement.
MeasureAirQuality,
/// Measure raw signals.
MeasureRawSignals,
/// Return the baseline value.
GetBaseline,
/// Set the baseline value.
SetBaseline,
/// Set the current absolute humidity.
SetHumidity,
/// Set the feature set.
GetFeatureSet,
}
impl Command {
fn as_bytes(self) -> [u8; 2] {
match self {
Command::GetSerial => [0x36, 0x82],
Command::SelfTest => [0x20, 0x32],
Command::InitAirQuality => [0x20, 0x03],
Command::MeasureAirQuality => [0x20, 0x08],
Command::MeasureRawSignals => [0x20, 0x50],
Command::GetBaseline => [0x20, 0x15],
Command::SetBaseline => [0x20, 0x1E],
Command::SetHumidity => [0x20, 0x61],
Command::GetFeatureSet => [0x20, 0x2F],
}
}
}
/// Driver for the SGP30
#[derive(Debug, Default)]
pub struct Sgp30<I2C, D> {
/// The concrete I²C device implementation.
i2c: I2C,
/// The I²C device address.
address: u8,
/// The concrete Delay implementation.
delay: D,
/// Whether the air quality measurement was initialized.
initialized: bool,
}
impl<I2C, D, E> Sgp30<I2C, D>
where
I2C: Read<Error = E> + Write<Error = E> + WriteRead<Error = E>,
D: DelayUs<u16> + DelayMs<u16>,
{
/// Create a new instance of the SGP30 driver.
pub fn new(i2c: I2C, address: u8, delay: D) -> Self {
Sgp30 {
i2c,
address,
delay,
initialized: false,
}
}
/// Destroy driver instance, return I²C bus instance.
pub fn destroy(self) -> I2C {
self.i2c
}
/// Write an I²C command to the sensor.
fn send_command(&mut self, command: Command) -> Result<(), Error<E>> {
self.i2c
.write(self.address, &command.as_bytes())
.map_err(Error::I2c)
}
/// Write an I²C command and data to the sensor.
///
/// The data slice must have a length of 2 or 4.
///
/// CRC checksums will automatically be added to the data.
fn send_command_and_data(&mut self, command: Command, data: &[u8]) -> Result<(), Error<E>> {
assert!(data.len() == 2 || data.len() == 4);
let mut buf = [0; 2 /* command */ + 6 /* max length of data + crc */];
buf[0..2].copy_from_slice(&command.as_bytes());
buf[2..4].copy_from_slice(&data[0..2]);
buf[4] = crc8::calculate(&data[0..2]);
if data.len() > 2 {
buf[5..7].copy_from_slice(&data[2..4]);
buf[7] = crc8::calculate(&data[2..4]);
}
let payload = if data.len() > 2 {
&buf[0..8]
} else {
&buf[0..5]
};
self.i2c.write(self.address, payload).map_err(Error::I2c)
}
/// Return the 48 bit serial number of the SGP30.
pub fn serial(&mut self) -> Result<[u8; 6], Error<E>> {
// Request serial number
self.send_command(Command::GetSerial)?;
// Recommended wait time according to datasheet (6.5)
self.delay.delay_us(500);
// Read serial number
let mut buf = [0; 9];
i2c::read_words_with_crc(&mut self.i2c, self.address, &mut buf)?;
Ok([buf[0], buf[1], buf[3], buf[4], buf[6], buf[7]])
}
/// Run an on-chip self-test. Return a boolean indicating whether the test succeeded.
pub fn selftest(&mut self) -> Result<bool, Error<E>> {
// Start self test
self.send_command(Command::SelfTest)?;
// Max duration according to datasheet (Table 10)
self.delay.delay_ms(220);
// Read result
let mut buf = [0; 3];
i2c::read_words_with_crc(&mut self.i2c, self.address, &mut buf)?;
// Compare with self-test success pattern
Ok(buf[0..2] == [0xd4, 0x00])
}
/// Initialize the air quality measurement.
///
/// The SGP30 uses a dynamic baseline compensation algorithm and on-chip
/// calibration parameters to provide two complementary air quality
/// signals.
///
/// Calling this method starts the air quality measurement. After
/// initializing the measurement, the `measure()` method must be called in
/// regular intervals of 1 s to ensure proper operation of the dynamic
/// baseline compensation algorithm. It is the responsibility of the user
/// of this driver to ensure that these periodic measurements are being
/// done.
///
/// For the first 15 s after initializing the air quality measurement, the
/// sensor is in an initialization phase during which it returns fixed
/// values of 400 ppm CO₂eq and 0 ppb TVOC. After 15 s (15 measurements)
/// the values should start to change.
///
/// A new init command has to be sent after every power-up or soft reset.
pub fn init(&mut self) -> Result<(), Error<E>> {
if self.initialized {
// Already initialized
return Ok(());
}
self.force_init()
}
/// Like [`init()`](struct.Sgp30.html#method.init), but without checking
/// whether the sensor is already initialized.
///
/// This might be necessary after a sensor soft or hard reset.
pub fn force_init(&mut self) -> Result<(), Error<E>> {
// Send command to sensor
self.send_command(Command::InitAirQuality)?;
// Max duration according to datasheet (Table 10)
self.delay.delay_ms(10);
self.initialized = true;
Ok(())
}
/// Get an air quality measurement.
///
/// Before calling this method, the air quality measurements must have been
/// initialized using the [`init()`](struct.Sgp30.html#method.init) method.
/// Otherwise an [`Error::NotInitialized`](enum.Error.html#variant.NotInitialized)
/// will be returned.
///
/// Once the measurements have been initialized, the
/// [`measure()`](struct.Sgp30.html#method.measure) method must be called
/// in regular intervals of 1 s to ensure proper operation of the dynamic
/// baseline compensation algorithm. It is the responsibility of the user
/// of this driver to ensure that these periodic measurements are being
/// done.
///
/// For the first 15 s after initializing the air quality measurement, the
/// sensor is in an initialization phase during which it returns fixed
/// values of 400 ppm CO₂eq and 0 ppb TVOC. After 15 s (15 measurements)
/// the values should start to change.
pub fn measure(&mut self) -> Result<Measurement, Error<E>> {
if !self.initialized {
// Measurements weren't initialized
return Err(Error::NotInitialized);
}
// Send command to sensor
self.send_command(Command::MeasureAirQuality)?;
// Max duration according to datasheet (Table 10)
self.delay.delay_ms(12);
// Read result
let mut buf = [0; 6];
i2c::read_words_with_crc(&mut self.i2c, self.address, &mut buf)?;
let co2eq_ppm = (u16::from(buf[0]) << 8) | u16::from(buf[1]);
let tvoc_ppb = (u16::from(buf[3]) << 8) | u16::from(buf[4]);
Ok(Measurement {
co2eq_ppm,
tvoc_ppb,
})
}
/// Return sensor raw signals.
///
/// This command is intended for part verification and testing purposes. It
/// returns the raw signals which are used as inputs for the on-chip
/// calibration and baseline compensation algorithm. The command performs a
/// measurement to which the sensor responds with the two signals for H2
/// and Ethanol.
pub fn measure_raw_signals(&mut self) -> Result<RawSignals, Error<E>> {
if !self.initialized {
// Measurements weren't initialized
return Err(Error::NotInitialized);
}
// Send command to sensor
self.send_command(Command::MeasureRawSignals)?;
// Max duration according to datasheet (Table 10)
self.delay.delay_ms(25);
// Read result
let mut buf = [0; 6];
i2c::read_words_with_crc(&mut self.i2c, self.address, &mut buf)?;
let h2_signal = (u16::from(buf[0]) << 8) | u16::from(buf[1]);
let ethanol_signal = (u16::from(buf[3]) << 8) | u16::from(buf[4]);
Ok(RawSignals {
h2: h2_signal,
ethanol: ethanol_signal,
})
}
/// Return the baseline values of the baseline correction algorithm.
///
/// The SGP30 provides the possibility to read and write the baseline
/// values of the baseline correction algorithm. This feature is used to
/// save the baseline in regular intervals on an external non-volatile
/// memory and restore it after a new power-up or soft reset of the sensor.
///
/// This function returns the baseline values for the two air quality
/// signals. These two values should be stored on an external memory. After
/// a power-up or soft reset, the baseline of the baseline correction
/// algorithm can be restored by calling
/// [`init()`](struct.Sgp30.html#method.init) followed by
/// [`set_baseline()`](struct.Sgp30.html#method.set_baseline).
pub fn get_baseline(&mut self) -> Result<Baseline, Error<E>> {
// Send command to sensor
self.send_command(Command::GetBaseline)?;
// Max duration according to datasheet (Table 10)
self.delay.delay_ms(10);
// Read result
let mut buf = [0; 6];
i2c::read_words_with_crc(&mut self.i2c, self.address, &mut buf)?;
let co2eq_baseline = (u16::from(buf[0]) << 8) | u16::from(buf[1]);
let tvoc_baseline = (u16::from(buf[3]) << 8) | u16::from(buf[4]);
Ok(Baseline {
co2eq: co2eq_baseline,
tvoc: tvoc_baseline,
})
}
/// Set the baseline values for the baseline correction algorithm.
///
/// Before calling this method, the air quality measurements must have been
/// initialized using the [`init()`](struct.Sgp30.html#method.init) method.
/// Otherwise an [`Error::NotInitialized`](enum.Error.html#variant.NotInitialized)
/// will be returned.
///
/// The SGP30 provides the possibility to read and write the baseline
/// values of the baseline correction algorithm. This feature is used to
/// save the baseline in regular intervals on an external non-volatile
/// memory and restore it after a new power-up or soft reset of the sensor.
///
/// This function sets the baseline values for the two air quality
/// signals.
pub fn set_baseline(&mut self, baseline: &Baseline) -> Result<(), Error<E>> {
if !self.initialized {
// Measurements weren't initialized
return Err(Error::NotInitialized);
}
// Send command and data to sensor
// Note that the order of the two parameters is inverted when writing
// compared to when reading.
let mut buf = [0; 4];
BigEndian::write_u16(&mut buf[0..2], baseline.tvoc);
BigEndian::write_u16(&mut buf[2..4], baseline.co2eq);
self.send_command_and_data(Command::SetBaseline, &buf)?;
// Max duration according to datasheet (Table 10)
self.delay.delay_ms(10);
Ok(())
}
/// Set the humidity value for the baseline correction algorithm.
///
/// The SGP30 features an on-chip humidity compensation for the air quality
/// signals (CO₂eq and TVOC) and sensor raw signals (H2 and Ethanol). To
/// use the on-chip humidity compensation, an absolute humidity value from
/// an external humidity sensor is required.
///
/// After setting a new humidity value, this value will be used by the
/// on-chip humidity compensation algorithm until a new humidity value is
/// set. Restarting the sensor (power-on or soft reset) or calling the
/// function with a `None` value sets the humidity value used for
/// compensation to its default value (11.57 g/m³) until a new humidity
/// value is sent.
///
/// Before calling this method, the air quality measurements must have been
/// initialized using the [`init()`](struct.Sgp30.html#method.init) method.
/// Otherwise an [`Error::NotInitialized`](enum.Error.html#variant.NotInitialized)
/// will be returned.
pub fn set_humidity(&mut self, humidity: Option<&Humidity>) -> Result<(), Error<E>> {
if !self.initialized {
// Measurements weren't initialized
return Err(Error::NotInitialized);
}
// Send command and data to sensor
let buf = match humidity {
Some(humi) => humi.as_bytes(),
None => [0, 0],
};
self.send_command_and_data(Command::SetHumidity, &buf)?;
// Max duration according to datasheet (Table 10)
self.delay.delay_ms(10);
Ok(())
}
/// Get the feature set.
///
/// The SGP30 features a versioning system for the available set of
/// measurement commands and on-chip algorithms. This so called feature set
/// version number can be read out with this method.
pub fn get_feature_set(&mut self) -> Result<FeatureSet, Error<E>> {
// Send command to sensor
self.send_command(Command::GetFeatureSet)?;
// Max duration according to datasheet (Table 10)
self.delay.delay_ms(2);
// Read result
let mut buf = [0; 3];
i2c::read_words_with_crc(&mut self.i2c, self.address, &mut buf)?;
Ok(FeatureSet::parse(buf[0], buf[1]))
}
}
#[cfg(test)]
mod tests {
use embedded_hal_mock as hal;
use self::hal::eh0::{
delay::NoopDelay,
i2c::{Mock as I2cMock, Transaction},
};
use super::*;
/// Test the `serial` function
#[test]
fn serial() {
let expectations = [
Transaction::write(0x58, Command::GetSerial.as_bytes()[..].into()),
Transaction::read(0x58, vec![0, 0, 129, 0, 100, 254, 204, 130, 135]),
];
let mock = I2cMock::new(&expectations);
let mut sgp = Sgp30::new(mock, 0x58, NoopDelay);
let serial = sgp.serial().unwrap();
assert_eq!(serial, [0, 0, 0, 100, 204, 130]);
sgp.destroy().done();
}
/// Test the `selftest` function
#[test]
fn selftest_ok() {
let expectations = [
Transaction::write(0x58, Command::SelfTest.as_bytes()[..].into()),
Transaction::read(0x58, vec![0xD4, 0x00, 0xC6]),
];
let mock = I2cMock::new(&expectations);
let mut sgp = Sgp30::new(mock, 0x58, NoopDelay);
assert!(sgp.selftest().unwrap());
sgp.destroy().done();
}
/// Test the `selftest` function
#[test]
fn selftest_fail() {
let expectations = [
Transaction::write(0x58, Command::SelfTest.as_bytes()[..].into()),
Transaction::read(0x58, vec![0x12, 0x34, 0x37]),
];
let mock = I2cMock::new(&expectations);
let mut sgp = Sgp30::new(mock, 0x58, NoopDelay);
assert!(!sgp.selftest().unwrap());
sgp.destroy().done();
}
/// Test the `measure` function: Require initialization
#[test]
fn measure_initialization_required() {
let mock = I2cMock::new(&[]);
let mut sgp = Sgp30::new(mock, 0x58, NoopDelay);
match sgp.measure() {
Err(Error::NotInitialized) => {}
Ok(_) => panic!("Error::NotInitialized not returned"),
Err(_) => panic!("Wrong error returned"),
}
sgp.destroy().done();
}
/// Test the `measure` function: Calculation of return values
#[test]
fn measure_success() {
let expectations = [
Transaction::write(0x58, Command::InitAirQuality.as_bytes()[..].into()),
Transaction::write(0x58, Command::MeasureAirQuality.as_bytes()[..].into()),
Transaction::read(0x58, vec![0x12, 0x34, 0x37, 0xD4, 0x02, 0xA4]),
];
let mock = I2cMock::new(&expectations);
let mut sgp = Sgp30::new(mock, 0x58, NoopDelay);
sgp.init().unwrap();
let measurements = sgp.measure().unwrap();
assert_eq!(measurements.co2eq_ppm, 4_660);
assert_eq!(measurements.tvoc_ppb, 54_274);
sgp.destroy().done();
}
/// Test the `get_baseline` function
#[test]
fn get_baseline() {
let expectations = [
Transaction::write(0x58, Command::InitAirQuality.as_bytes()[..].into()),
Transaction::write(0x58, Command::GetBaseline.as_bytes()[..].into()),
Transaction::read(0x58, vec![0x12, 0x34, 0x37, 0xD4, 0x02, 0xA4]),
];
let mock = I2cMock::new(&expectations);
let mut sgp = Sgp30::new(mock, 0x58, NoopDelay);
sgp.init().unwrap();
let baseline = sgp.get_baseline().unwrap();
assert_eq!(baseline.co2eq, 4_660);
assert_eq!(baseline.tvoc, 54_274);
sgp.destroy().done();
}
/// Test the `set_baseline` function
#[test]
fn set_baseline() {
#[rustfmt::skip]
let expectations = [
Transaction::write(0x58, Command::InitAirQuality.as_bytes()[..].into()),
Transaction::write(0x58, vec![
/* command: */ 0x20, 0x1E,
/* data + crc8: */ 0x56, 0x78, 0x7D, 0x12, 0x34, 0x37,
]),
];
let mock = I2cMock::new(&expectations);
let mut sgp = Sgp30::new(mock, 0x58, NoopDelay);
sgp.init().unwrap();
let baseline = Baseline {
co2eq: 0x1234,
tvoc: 0x5678,
};
sgp.set_baseline(&baseline).unwrap();
sgp.destroy().done();
}
/// Test the `set_humidity` function
#[test]
fn set_humidity() {
#[rustfmt::skip]
let expectations = [
Transaction::write(0x58, Command::InitAirQuality.as_bytes()[..].into()),
Transaction::write(0x58, vec![
/* command: */ 0x20, 0x61,
/* data + crc8: */ 0x0F, 0x80, 0x62,
]),
];
let mock = I2cMock::new(&expectations);
let mut sgp = Sgp30::new(mock, 0x58, NoopDelay);
sgp.init().unwrap();
let humidity = Humidity::from_f32(15.5).unwrap();
sgp.set_humidity(Some(&humidity)).unwrap();
sgp.destroy().done();
}
/// Test the `set_humidity` function with a None value
#[test]
fn set_humidity_none() {
#[rustfmt::skip]
let expectations = [
Transaction::write(0x58, Command::InitAirQuality.as_bytes()[..].into()),
Transaction::write(0x58, vec![
/* command: */ 0x20, 0x61,
/* data + crc8: */ 0x00, 0x00, 0x81,
]),
];
let mock = I2cMock::new(&expectations);
let mut sgp = Sgp30::new(mock, 0x58, NoopDelay);
sgp.init().unwrap();
sgp.set_humidity(None).unwrap();
sgp.destroy().done();
}
/// Test the `get_feature_set` function.
#[test]
fn get_feature_set() {
let expectations = [
Transaction::write(0x58, Command::InitAirQuality.as_bytes()[..].into()),
Transaction::write(0x58, Command::GetFeatureSet.as_bytes()[..].into()),
Transaction::read(0x58, vec![0x00, 0x42, 0xDE]),
];
let mock = I2cMock::new(&expectations);
let mut sgp = Sgp30::new(mock, 0x58, NoopDelay);
sgp.init().unwrap();
let feature_set = sgp.get_feature_set().unwrap();
assert_eq!(feature_set.product_type, ProductType::Sgp30);
assert_eq!(feature_set.product_version, 0x42);
sgp.destroy().done();
}
/// Test the `measure_raw_signals` function.
#[test]
fn measure_raw_signals() {
let expectations = [
Transaction::write(0x58, Command::InitAirQuality.as_bytes()[..].into()),
Transaction::write(0x58, Command::MeasureRawSignals.as_bytes()[..].into()),
Transaction::read(0x58, vec![0x12, 0x34, 0x37, 0x56, 0x78, 0x7D]),
];
let mock = I2cMock::new(&expectations);
let mut sgp = Sgp30::new(mock, 0x58, NoopDelay);
sgp.init().unwrap();
let signals = sgp.measure_raw_signals().unwrap();
assert_eq!(signals.h2, (0x12 << 8) + 0x34);
assert_eq!(signals.ethanol, (0x56 << 8) + 0x78);
sgp.destroy().done();
}
}