32 lines
1.0 KiB
Rust
32 lines
1.0 KiB
Rust
//! Unique ID (UID)
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/// Get this device's unique 96-bit ID.
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pub fn uid() -> &'static [u8; 12] {
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unsafe { &*crate::pac::UID.uid(0).as_ptr().cast::<[u8; 12]>() }
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}
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/// Get this device's unique 96-bit ID, encoded into a string of 24 hexadecimal ASCII digits.
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pub fn uid_hex() -> &'static str {
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unsafe { core::str::from_utf8_unchecked(uid_hex_bytes()) }
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}
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/// Get this device's unique 96-bit ID, encoded into 24 hexadecimal ASCII bytes.
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pub fn uid_hex_bytes() -> &'static [u8; 24] {
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const HEX: &[u8; 16] = b"0123456789ABCDEF";
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static mut UID_HEX: [u8; 24] = [0; 24];
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static mut LOADED: bool = false;
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critical_section::with(|_| unsafe {
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if !LOADED {
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let uid = uid();
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for (idx, v) in uid.iter().enumerate() {
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let lo = v & 0x0f;
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let hi = (v & 0xf0) >> 4;
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UID_HEX[idx * 2] = HEX[hi as usize];
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UID_HEX[idx * 2 + 1] = HEX[lo as usize];
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}
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LOADED = true;
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}
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});
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unsafe { &*core::ptr::addr_of!(UID_HEX) }
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}
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