Struct Temperature 

pub struct Temperature(/* private fields */);

Represents a temperature value in degrees Celsius, as read from or written to the R4DCB08.

Valid addresses are in the range -3276.8 to 3276.7 (inclusive). Use Temperature::try_from to create an instance from a f32.

Implementations

impl Temperature

pub const NAN: Temperature

Represents a Not-a-Number temperature, often indicating a sensor error or disconnection.

pub const MIN: f32 = -3276.69995f32

Minimum measurable/representable temperature value (-3276.7 °C).

pub const MAX: f32 = 3276.69995f32

Maximum measurable/representable temperature value (+3276.7 °C).

pub fn decode_from_holding_registers(word: Word) -> Self

Decodes a Temperature from a single Modbus holding register Word.

Arguments

• word - The Word value read from the temperature or correction register.

Returns

The decoded Temperature. Returns Temperature::NAN indicating a sensor error or disconnection.

pub fn encode_for_write_register(&self) -> Result<Word, Error>

Encodes the Temperature into a Word value for writing to a Modbus register.

Returns

The Word representation of the temperature, ready for writing, or an Error if encoding fails.

Errors

• Error::EncodeError: if the temperature value is NAN.

Methods from Deref<Target = f32>

pub const RADIX: u32 = 2u32

pub const MANTISSA_DIGITS: u32 = 24u32

pub const DIGITS: u32 = 6u32

pub const EPSILON: f32 = 1.1920929E-7f32

pub const MIN: f32 = -3.40282347E+38f32

pub const MIN_POSITIVE: f32 = 1.17549435E-38f32

pub const MAX: f32 = 3.40282347E+38f32

pub const MIN_EXP: i32 = -125i32

pub const MAX_EXP: i32 = 128i32

pub const MIN_10_EXP: i32 = -37i32

pub const MAX_10_EXP: i32 = 38i32

pub const NAN: f32 = NaN_f32

pub const INFINITY: f32 = +Inf_f32

pub const NEG_INFINITY: f32 = -Inf_f32

pub fn total_cmp(&self, other: &f32) -> Ordering

Returns the ordering between self and other.

Unlike the standard partial comparison between floating point numbers, this comparison always produces an ordering in accordance to the totalOrder predicate as defined in the IEEE 754 (2008 revision) floating point standard. The values are ordered in the following sequence:

• negative quiet NaN
• negative signaling NaN
• negative infinity
• negative numbers
• negative subnormal numbers
• negative zero
• positive zero
• positive subnormal numbers
• positive numbers
• positive infinity
• positive signaling NaN
• positive quiet NaN.

The ordering established by this function does not always agree with the PartialOrd and PartialEq implementations of f32. For example, they consider negative and positive zero equal, while total_cmp doesn’t.

The interpretation of the signaling NaN bit follows the definition in the IEEE 754 standard, which may not match the interpretation by some of the older, non-conformant (e.g. MIPS) hardware implementations.

Example

struct GoodBoy {
    name: String,
    weight: f32,
}

let mut bois = vec![
    GoodBoy { name: "Pucci".to_owned(), weight: 0.1 },
    GoodBoy { name: "Woofer".to_owned(), weight: 99.0 },
    GoodBoy { name: "Yapper".to_owned(), weight: 10.0 },
    GoodBoy { name: "Chonk".to_owned(), weight: f32::INFINITY },
    GoodBoy { name: "Abs. Unit".to_owned(), weight: f32::NAN },
    GoodBoy { name: "Floaty".to_owned(), weight: -5.0 },
];

bois.sort_by(|a, b| a.weight.total_cmp(&b.weight));

// `f32::NAN` could be positive or negative, which will affect the sort order.
if f32::NAN.is_sign_negative() {
    assert!(bois.into_iter().map(|b| b.weight)
        .zip([f32::NAN, -5.0, 0.1, 10.0, 99.0, f32::INFINITY].iter())
        .all(|(a, b)| a.to_bits() == b.to_bits()))
} else {
    assert!(bois.into_iter().map(|b| b.weight)
        .zip([-5.0, 0.1, 10.0, 99.0, f32::INFINITY, f32::NAN].iter())
        .all(|(a, b)| a.to_bits() == b.to_bits()))
}

Trait Implementations

impl Clone for Temperature

fn clone(&self) -> Temperature

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Temperature

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Deref for Temperature

Allows direct access to the underlying f32 temperature value.

type Target = f32

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<'de> Deserialize<'de> for Temperature

Available on crate feature serde only.

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Temperature

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the Temperature to one decimal place (e.g., “21.9”, “-3.0”, “NAN”).

impl PartialEq for Temperature

fn eq(&self, other: &Temperature) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Temperature

fn partial_cmp(&self, other: &Temperature) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for Temperature

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl TryFrom<f32> for Temperature

fn try_from(value: f32) -> Result<Self, Self::Error>

Attempts to create a Temperature from an f32 value. Returns an error if the value is outside the representable range [MIN, MAX]. Note: This does not allow creating Temperature::NAN via try_from. Use Temperature::NAN constant directly.

type Error = ErrorDegreeCelsiusOutOfRange

The type returned in the event of a conversion error.

impl Copy for Temperature

impl StructuralPartialEq for Temperature