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use crate::{
mode, BitFlags, Config, Error, Hdc20xx, Measurement, MeasurementMode, Register, SlaveAddr,
Status,
};
use core::marker::PhantomData;
use embedded_hal::blocking::i2c;
impl<I2C> Hdc20xx<I2C, mode::OneShot> {
pub fn new(i2c: I2C, address: SlaveAddr) -> Self {
Hdc20xx {
i2c,
address: address.addr(),
meas_config: Config { bits: 0 },
was_measurement_started: false,
_mode: PhantomData,
}
}
}
impl<I2C, MODE> Hdc20xx<I2C, MODE> {
pub fn destroy(self) -> I2C {
self.i2c
}
}
impl<I2C, E, MODE> Hdc20xx<I2C, MODE>
where
I2C: i2c::WriteRead<Error = E> + i2c::Write<Error = E>,
{
pub fn set_measurement_mode(&mut self, mode: MeasurementMode) -> Result<(), Error<E>> {
let config = match mode {
MeasurementMode::TemperatureAndHumidity => {
self.meas_config.with_low(BitFlags::TEMP_ONLY)
}
MeasurementMode::TemperatureOnly => self.meas_config.with_high(BitFlags::TEMP_ONLY),
};
self.write_register(Register::MEAS_CONF, config.bits)?;
self.meas_config = config;
Ok(())
}
pub fn status(&mut self) -> Result<Status, Error<E>> {
let status = self.read_register(Register::DRDY)?;
Ok(Status {
data_ready: (status & BitFlags::DRDY_STATUS) != 0,
high_temp_threshold_exceeded: (status & BitFlags::TH_STATUS) != 0,
low_temp_threshold_exceeded: (status & BitFlags::TL_STATUS) != 0,
high_humidity_threshold_exceeded: (status & BitFlags::HH_STATUS) != 0,
low_humidity_threshold_exceeded: (status & BitFlags::HL_STATUS) != 0,
})
}
pub fn device_id(&mut self) -> Result<u16, Error<E>> {
self.read_double_register(Register::DEVICE_ID_L)
}
pub fn manufacturer_id(&mut self) -> Result<u16, Error<E>> {
self.read_double_register(Register::MANUFACTURER_ID_L)
}
}
impl<I2C, E> Hdc20xx<I2C, mode::OneShot>
where
I2C: i2c::WriteRead<Error = E> + i2c::Write<Error = E>,
{
pub fn read(&mut self) -> nb::Result<Measurement, Error<E>> {
if self.was_measurement_started {
let status = self.status()?;
if status.data_ready {
let include_humidity = !self.meas_config.is_high(BitFlags::TEMP_ONLY);
let mut data = [0; 4];
if include_humidity {
self.read_data(Register::TEMP_L, &mut data)?;
} else {
self.read_data(Register::TEMP_L, &mut data[..2])?;
}
self.was_measurement_started = false;
let temp_raw = u16::from(data[0]) | (u16::from(data[1]) << 8);
let temp = f32::from(temp_raw) / 65536.0 * 165.0 - 40.0;
if include_humidity {
let rh_raw = u16::from(data[2]) | (u16::from(data[3]) << 8);
let rh = f32::from(rh_raw) / 65536.0 * 100.0;
Ok(Measurement {
temperature: temp,
humidity: Some(rh),
status,
})
} else {
Ok(Measurement {
temperature: temp,
humidity: None,
status,
})
}
} else {
Err(nb::Error::WouldBlock)
}
} else {
let meas_conf = self.meas_config.with_high(BitFlags::MEAS_TRIG);
self.write_register(Register::MEAS_CONF, meas_conf.bits)?;
self.was_measurement_started = true;
Err(nb::Error::WouldBlock)
}
}
pub fn software_reset(&mut self) -> Result<(), Error<E>> {
let conf = self.meas_config.with_high(BitFlags::SOFT_RESET);
self.write_register(Register::MEAS_CONF, conf.bits)
}
}
impl Config {
fn with_high(self, mask: u8) -> Self {
Config {
bits: self.bits | mask,
}
}
fn with_low(self, mask: u8) -> Self {
Config {
bits: self.bits & !mask,
}
}
fn is_high(self, mask: u8) -> bool {
(self.bits & mask) != 0
}
}