atecc608b/
slot.rs

1// Copyright (c) 2026 Tuloup Simon
2//
3// This program is free software: you can redistribute it and/or modify
4// it under the terms of the GNU General Public License as published by
5// the Free Software Foundation, either version 3 of the License, or
6// any later version.
7//
8// This program is distributed in the hope that it will be useful,
9// but WITHOUT ANY WARRANTY; without even the implied warranty of
10// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11// GNU General Public License for more details.
12//
13// You should have received a copy of the GNU General Public License
14// along with this program. If not, see <https://www.gnu.org/licenses/>.
15
16//! Slot identifiers.
17//!
18//! The ATECC608B exposes 16 slots, numbered 0 to 15. This module provides a
19//! type-safe wrapper to avoid passing arbitrary `u8` values around.
20
21/// Total number of slots on the chip.
22pub(crate) const SLOT_COUNT: u8 = 16;
23
24/// A validated slot identifier.
25#[derive(Debug, Clone, Copy, PartialEq, Eq)]
26#[cfg_attr(feature = "defmt", derive(defmt::Format))]
27pub struct Slot(u8);
28
29impl Slot
30{
31    /// Try to build a slot from a raw `u8`. Returns `None` if `index >= 16`.
32    #[must_use]
33    pub const fn new(index: u8) -> Option<Self>
34    {
35        if index < SLOT_COUNT
36        {
37            Some(Self(index))
38        }
39        else
40        {
41            None
42        }
43    }
44
45    /// Build a slot from a known-valid constant.
46    ///
47    /// # Panics
48    /// Panics at compile time if `index >= 16`.
49    #[must_use]
50    pub const fn const_new(index: u8) -> Self
51    {
52        assert!(index < SLOT_COUNT, "slot index out of range");
53        Self(index)
54    }
55
56    /// Return the raw slot index.
57    #[must_use]
58    pub const fn as_u8(self) -> u8
59    {
60        self.0
61    }
62}
atecc608b/slot.rs

atecc608b/
slot.rs
