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//! This is a platform agnostic Rust driver for the TMP102 and TMP112 //! high-accuracy, low-power, digital temperature sensors, based on the //! [`embedded-hal`] traits. //! //! [`embedded-hal`]: https://github.com/rust-embedded/embedded-hal //! //! This driver allows you to: //! - Change into one-shot or continuous conversion mode. //! - Read the temperature. //! - Enable/disable the extended measurement mode. //! - Trigger a one-shot measurement. //! - Read whether the one-shot measurement result is ready. //! - Set the conversion rate. //! - Set the high/low temperature threshold. //! - Set the fault queue. //! - Set the alert polarity. //! - Set the thermostat mode. //! - Read whether a comparator mode alert is active. //! //! ## The devices //! //! This driver is compatible with both the TMP102 device as well as the TMP112 //! family of devices, including TMP112A, TMP112B and TMP112N. //! //! These temperature sensors are highly linear and do not require complex //! calculations or lookup tables to derive the temperature. The on-chip //! 12-bit ADC offers resolutions down to 0.0625°C. //! //! The TMP102 device is a digital temperature sensor ideal for NTC/PTC //! thermistor replacement where high accuracy is required. The device offers an //! accuracy of +/-0.5°C without requiring calibration or external component //! signal conditioning. //! //! The TMP112 family of devices are digital temperature sensors designed for //! high-accuracy, low-power, NTC/PTC thermistor replacements where high accuracy //! is required. The TMP112A and TMP112B offers 0.5°C accuracy and are optimized //! to provide the best PSR performance for 3.3V and 1.8V operation respectively, //! while TMP112N offers 1°C accuracy. //! //! The devices feature SMBus(TM), two-wire and I2C interface compatibility, //! and allows up to four devices on one bus. //! //! Datasheets: //! - [TMP102](http://www.ti.com/lit/ds/symlink/tmp102.pdf) //! - [TMP112x](http://www.ti.com/lit/ds/symlink/tmp112.pdf) //! //! ## Usage examples (see also examples folder) //! //! ### Read temperature in continuous mode //! //! Import this crate and an `embedded_hal` implementation, then instantiate //! the device: //! //! ```no_run //! extern crate linux_embedded_hal as hal; //! extern crate tmp1x2; //! use tmp1x2::{Tmp1x2, SlaveAddr}; //! //! # fn main() { //! let dev = hal::I2cdev::new("/dev/i2c-1").unwrap(); //! let address = SlaveAddr::default(); //! // Per default the device is in continuous mode //! let mut sensor = Tmp1x2::new(dev, address); //! let temperature = sensor.read_temperature().unwrap(); //! println!("Temperature: {}", temperature); //! # } //! ``` //! //! ### Provide an alternative address //! //! ```no_run //! extern crate linux_embedded_hal as hal; //! extern crate tmp1x2; //! use tmp1x2::{Tmp1x2, SlaveAddr}; //! //! # fn main() { //! let dev = hal::I2cdev::new("/dev/i2c-1").unwrap(); //! let (a1, a0) = (false, true); //! let address = SlaveAddr::Alternative(a1, a0); //! let mut sensor = Tmp1x2::new(dev, address); //! # } //! ``` //! //! ### Change into one-shot mode and trigger a measurement //! //! ```no_run //! extern crate linux_embedded_hal as hal; //! extern crate tmp1x2; //! extern crate nb; //! //! use tmp1x2::{Tmp1x2, SlaveAddr}; //! use nb::block; //! //! # fn main() { //! let dev = hal::I2cdev::new("/dev/i2c-1").unwrap(); //! let sensor = Tmp1x2::new(dev, SlaveAddr::default()); //! let mut sensor = sensor.into_one_shot().ok().expect("Mode change error"); //! let temperature = block!(sensor.read_temperature()); //! # } //! ``` //! //! ### Get the device back if there was an error during a mode change //! //! ```no_run //! extern crate linux_embedded_hal as hal; //! extern crate tmp1x2; //! //! use tmp1x2::{ModeChangeError, Tmp1x2, SlaveAddr}; //! //! # fn main() { //! let dev = hal::I2cdev::new("/dev/i2c-1").unwrap(); //! let mut sensor_continuous = Tmp1x2::new(dev, SlaveAddr::default()); //! let result = sensor_continuous.into_one_shot(); //! if let Err(ModeChangeError::I2C(e, dev)) = result { //! sensor_continuous = dev; //! } else if let Ok(one_shot_sensor) = result { //! // do something with one-shot sensor... //! } else { //! unreachable!(); //! } //! # } //! ``` //! //! //! ### Enable the extended measurement mode //! //! ```no_run //! extern crate linux_embedded_hal as hal; //! extern crate tmp1x2; //! //! use tmp1x2::{Tmp1x2, SlaveAddr}; //! //! # fn main() { //! let dev = hal::I2cdev::new("/dev/i2c-1").unwrap(); //! let mut sensor = Tmp1x2::new(dev, SlaveAddr::default()); //! sensor.enable_extended_mode().unwrap(); //! # } //! ``` //! //! ### Set the conversion rate to 1Hz //! //! ```no_run //! extern crate linux_embedded_hal as hal; //! extern crate tmp1x2; //! //! use hal::I2cdev; //! use tmp1x2::{ Tmp1x2, SlaveAddr, ConversionRate }; //! //! # fn main() { //! let dev = I2cdev::new("/dev/i2c-1").unwrap(); //! let mut sensor = Tmp1x2::new(dev, SlaveAddr::default()); //! sensor.set_conversion_rate(ConversionRate::_1Hz).unwrap(); //! # } //! ``` //! //! ### Set the high and low temperature thresholds //! //! ```no_run //! extern crate linux_embedded_hal as hal; //! extern crate tmp1x2; //! //! use hal::I2cdev; //! use tmp1x2::{ Tmp1x2, SlaveAddr, ConversionRate }; //! //! # fn main() { //! let dev = I2cdev::new("/dev/i2c-1").unwrap(); //! let mut sensor = Tmp1x2::new(dev, SlaveAddr::default()); //! sensor.set_low_temperature_threshold(-15.0).unwrap(); //! sensor.set_high_temperature_threshold(60.0).unwrap(); //! # } //! ``` //! //! ### Set the fault queue //! //! This sets the number of consecutive faults that will trigger an alert. //! //! ```no_run //! extern crate linux_embedded_hal as hal; //! extern crate tmp1x2; //! //! use hal::I2cdev; //! use tmp1x2::{ Tmp1x2, SlaveAddr, FaultQueue }; //! //! # fn main() { //! let dev = I2cdev::new("/dev/i2c-1").unwrap(); //! let mut sensor = Tmp1x2::new(dev, SlaveAddr::default()); //! sensor.set_fault_queue(FaultQueue::_4).unwrap(); //! # } //! ``` //! //! ### Set the alert polarity //! //! ```no_run //! extern crate linux_embedded_hal as hal; //! extern crate tmp1x2; //! //! use hal::I2cdev; //! use tmp1x2::{ Tmp1x2, SlaveAddr, AlertPolarity }; //! //! # fn main() { //! let dev = I2cdev::new("/dev/i2c-1").unwrap(); //! let mut sensor = Tmp1x2::new(dev, SlaveAddr::default()); //! sensor.set_alert_polarity(AlertPolarity::ActiveHigh).unwrap(); //! # } //! ``` //! //! ### Set the thermostat mode //! //! ```no_run //! extern crate linux_embedded_hal as hal; //! extern crate tmp1x2; //! //! use hal::I2cdev; //! use tmp1x2::{ Tmp1x2, SlaveAddr, ThermostatMode }; //! //! # fn main() { //! let dev = I2cdev::new("/dev/i2c-1").unwrap(); //! let mut sensor = Tmp1x2::new(dev, SlaveAddr::default()); //! sensor.set_thermostat_mode(ThermostatMode::Interrupt).unwrap(); //! # } //! ``` //! //! ### Check whether an alert is active as defined by the comparator mode //! //! Note that this ignores the thermostat mode setting and always refers to //! the status as defined by the comparator mode. //! //! ```no_run //! extern crate linux_embedded_hal as hal; //! extern crate tmp1x2; //! //! use hal::I2cdev; //! use tmp1x2::{Tmp1x2, SlaveAddr}; //! //! # fn main() { //! let dev = I2cdev::new("/dev/i2c-1").unwrap(); //! let mut sensor = Tmp1x2::new(dev, SlaveAddr::default()); //! let alert = sensor.is_comparator_mode_alert_active().unwrap(); //! # } //! ``` #![deny(unsafe_code)] #![deny(missing_docs)] #![no_std] extern crate embedded_hal as hal; use hal::blocking::i2c; extern crate nb; use core::marker::PhantomData; /// Possible errors in this crate #[derive(Debug)] pub enum Error<E> { /// I²C bus error I2C(E), } /// Error type for mode changes. /// /// This allows to retrieve the unchanged device in case of an error. #[derive(Debug)] pub enum ModeChangeError<E, DEV> { /// I²C bus error while changing mode. /// /// `E` is the error that happened. /// `DEV` is the device with the mode unchanged. I2C(E, DEV), } /// Conversion rate for continuous conversion mode #[derive(Debug, Clone, Copy)] pub enum ConversionRate { /// 0.25Hz _0_25Hz, /// 1Hz _1Hz, /// 4 Hz (default) _4Hz, /// 8 Hz _8Hz, } /// Fault queue /// /// Number of consecutive faults necessary to trigger an alert. #[derive(Debug, Clone, Copy)] pub enum FaultQueue { /// 1 fault will trigger an alert (default) _1, /// 2 consecutive faults will trigger an alert _2, /// 4 consecutive faults will trigger an alert _4, /// 6 consecutive faults will trigger an alert _6, } /// Alert polarity #[derive(Debug, Clone, Copy)] pub enum AlertPolarity { /// Active low (default) ActiveLow, /// Active high ActiveHigh, } /// Thermostat mode #[derive(Debug, Clone, Copy)] pub enum ThermostatMode { /// Comparator (default) /// /// In this mode an alert is generated (set alert pin and alert bit /// according to selected active polarity) when the temperature equals or /// exceeds the value set as *high* temperature threshold and remains /// active until the temperature falls below the value set as *low* /// temperature threshold. Comparator, /// Interrupt /// /// In this mode an alert is generated (set alert pin and alert bit /// according to selected active polarity) when the temperature exceeds the /// value set as *high* temperature threshold or goes below the value set /// as *low* temperature threshold. Interrupt, } /// Possible slave addresses #[derive(Debug, Clone)] pub enum SlaveAddr { /// Default slave address Default, /// Alternative slave address providing bit values for A1 and A0 Alternative(bool, bool), } impl Default for SlaveAddr { /// Default slave address fn default() -> Self { SlaveAddr::Default } } impl SlaveAddr { fn addr(self, default: u8) -> u8 { match self { SlaveAddr::Default => default, SlaveAddr::Alternative(a1, a0) => default | ((a1 as u8) << 1) | a0 as u8, } } } const DEVICE_BASE_ADDRESS: u8 = 0b100_1000; struct Register; impl Register { const TEMPERATURE: u8 = 0x00; const CONFIG: u8 = 0x01; const T_LOW: u8 = 0x02; const T_HIGH: u8 = 0x03; } struct BitFlagsLow; impl BitFlagsLow { const SHUTDOWN: u8 = 0b0000_0001; const THERMOSTAT: u8 = 0b0000_0010; const ALERT_POLARITY: u8 = 0b0000_0100; const FAULT_QUEUE0: u8 = 0b0000_1000; const FAULT_QUEUE1: u8 = 0b0001_0000; const RESOLUTION: u8 = 0b0110_0000; const ONE_SHOT: u8 = 0b1000_0000; } struct BitFlagsHigh; impl BitFlagsHigh { const EXTENDED_MODE: u8 = 0b0001_0000; const ALERT: u8 = 0b0010_0000; const CONV_RATE0: u8 = 0b0100_0000; const CONV_RATE1: u8 = 0b1000_0000; } #[derive(Debug, Clone)] struct Config { lsb: u8, msb: u8, } impl Default for Config { fn default() -> Self { Config { lsb: BitFlagsLow::RESOLUTION, msb: BitFlagsHigh::ALERT | BitFlagsHigh::CONV_RATE1, } } } #[doc(hidden)] pub mod marker { pub mod mode { #[derive(Debug)] pub struct Continuous(()); #[derive(Debug)] pub struct OneShot(()); } } /// TMP1X2 device driver. #[derive(Debug, Default)] pub struct Tmp1x2<I2C, MODE> { /// The concrete I²C device implementation. i2c: I2C, /// The I²C device address. address: u8, /// Configuration register status. config: Config, /// A temperature conversion was started. a_temperature_conversion_was_started: bool, _mode: PhantomData<MODE>, } impl<I2C, E> Tmp1x2<I2C, marker::mode::Continuous> where I2C: i2c::Write<Error = E>, { /// Create new instance of the TMP102 or TMP112x device. /// /// By default they are in continuous conversion mode. pub fn new(i2c: I2C, address: SlaveAddr) -> Self { Tmp1x2 { i2c, address: address.addr(DEVICE_BASE_ADDRESS), config: Config::default(), a_temperature_conversion_was_started: false, _mode: PhantomData, } } } impl<I2C, MODE> Tmp1x2<I2C, MODE> { /// Destroy driver instance, return I²C bus instance. pub fn destroy(self) -> I2C { self.i2c } } mod configuration; mod conversion; mod reading; //impl<E> core::fmt::Debug for nb::Error<E> {} #[cfg(test)] mod tests { use super::*; use DEVICE_BASE_ADDRESS as BASE_ADDR; extern crate embedded_hal_mock as hal; #[test] fn can_get_default_address() { let addr = SlaveAddr::default(); assert_eq!(BASE_ADDR, addr.addr(BASE_ADDR)); } #[test] fn can_generate_alternative_addresses() { assert_eq!( 0b100_1000, SlaveAddr::Alternative(false, false).addr(BASE_ADDR) ); assert_eq!( 0b100_1001, SlaveAddr::Alternative(false, true).addr(BASE_ADDR) ); assert_eq!( 0b100_1010, SlaveAddr::Alternative(true, false).addr(BASE_ADDR) ); assert_eq!( 0b100_1011, SlaveAddr::Alternative(true, true).addr(BASE_ADDR) ); } #[test] fn default_config() { let dev = Tmp1x2::new(hal::i2c::Mock::new(&[]), SlaveAddr::default()); assert_eq!(0b0110_0000, dev.config.lsb); assert_eq!(0b1010_0000, dev.config.msb); } }