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//! CAN Identifiers.
/// Standard 11-bit CAN Identifier (`0..=0x7FF`).
#[derive(Debug, Copy, Clone, Eq, PartialEq)]
pub struct StandardId(u16);
impl StandardId {
/// CAN ID `0`, the highest priority.
pub const ZERO: Self = StandardId(0);
/// CAN ID `0x7FF`, the lowest priority.
pub const MAX: Self = StandardId(0x7FF);
/// Tries to create a `StandardId` from a raw 16-bit integer.
///
/// This will return `None` if `raw` is out of range of an 11-bit integer (`> 0x7FF`).
#[inline]
pub fn new(raw: u16) -> Option<Self> {
if raw <= 0x7FF {
Some(StandardId(raw))
} else {
None
}
}
/// Creates a new `StandardId` without checking if it is inside the valid range.
///
/// # Safety
/// Using this method can create an invalid ID and is thus marked as unsafe.
#[inline]
pub const unsafe fn new_unchecked(raw: u16) -> Self {
StandardId(raw)
}
/// Returns this CAN Identifier as a raw 16-bit integer.
#[inline]
pub fn as_raw(&self) -> u16 {
self.0
}
}
/// Extended 29-bit CAN Identifier (`0..=1FFF_FFFF`).
#[derive(Debug, Copy, Clone, Eq, PartialEq)]
pub struct ExtendedId(u32);
impl ExtendedId {
/// CAN ID `0`, the highest priority.
pub const ZERO: Self = ExtendedId(0);
/// CAN ID `0x1FFFFFFF`, the lowest priority.
pub const MAX: Self = ExtendedId(0x1FFF_FFFF);
/// Tries to create a `ExtendedId` from a raw 32-bit integer.
///
/// This will return `None` if `raw` is out of range of an 29-bit integer (`> 0x1FFF_FFFF`).
#[inline]
pub fn new(raw: u32) -> Option<Self> {
if raw <= 0x1FFF_FFFF {
Some(ExtendedId(raw))
} else {
None
}
}
/// Creates a new `ExtendedId` without checking if it is inside the valid range.
///
/// # Safety
/// Using this method can create an invalid ID and is thus marked as unsafe.
#[inline]
pub const unsafe fn new_unchecked(raw: u32) -> Self {
ExtendedId(raw)
}
/// Returns this CAN Identifier as a raw 32-bit integer.
#[inline]
pub fn as_raw(&self) -> u32 {
self.0
}
/// Returns the Base ID part of this extended identifier.
pub fn standard_id(&self) -> StandardId {
// ID-28 to ID-18
StandardId((self.0 >> 18) as u16)
}
}
/// A CAN Identifier (standard or extended).
#[derive(Debug, Copy, Clone, Eq, PartialEq)]
pub enum Id {
/// Standard 11-bit Identifier (`0..=0x7FF`).
Standard(StandardId),
/// Extended 29-bit Identifier (`0..=0x1FFF_FFFF`).
Extended(ExtendedId),
}
impl From<StandardId> for Id {
#[inline]
fn from(id: StandardId) -> Self {
Id::Standard(id)
}
}
impl From<ExtendedId> for Id {
#[inline]
fn from(id: ExtendedId) -> Self {
Id::Extended(id)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn standard_id_new() {
assert_eq!(
StandardId::new(StandardId::MAX.as_raw()),
Some(StandardId::MAX)
);
}
#[test]
fn standard_id_new_out_of_range() {
assert_eq!(StandardId::new(StandardId::MAX.as_raw() + 1), None);
}
#[test]
fn standard_id_new_unchecked_out_of_range() {
let id = StandardId::MAX.as_raw() + 1;
assert_eq!(unsafe { StandardId::new_unchecked(id) }, StandardId(id));
}
#[test]
fn extended_id_new() {
assert_eq!(
ExtendedId::new(ExtendedId::MAX.as_raw()),
Some(ExtendedId::MAX)
);
}
#[test]
fn extended_id_new_out_of_range() {
assert_eq!(ExtendedId::new(ExtendedId::MAX.as_raw() + 1), None);
}
#[test]
fn extended_id_new_unchecked_out_of_range() {
let id = ExtendedId::MAX.as_raw() + 1;
assert_eq!(unsafe { ExtendedId::new_unchecked(id) }, ExtendedId(id));
}
#[test]
fn get_standard_id_from_extended_id() {
assert_eq!(
Some(ExtendedId::MAX.standard_id()),
StandardId::new((ExtendedId::MAX.0 >> 18) as u16)
);
}
}