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//! Device electronic signature
//!
//! (stored in flash memory)
use core::fmt;
use core::str;
const UID_PTR: u32 = 0x1FFF_F7AC;
use core::convert::TryInto;
impl Uid {
fn ptr() -> *const Self {
UID_PTR as *const _
}
/// Returns a wrapped reference to the value in flash memory
#[must_use]
pub fn get() -> &'static Self {
// SAFETY: The Uid pointer is definitly correct and as it is only ever shared immutable
// mutliple references to it are fine.
unsafe { &*Self::ptr() }
}
}
/// Uniqure Device ID register
#[repr(C, packed)]
pub struct Uid {
x: u16,
y: u16,
waf: u8,
lot: [u8; 7],
}
#[cfg(feature = "defmt")]
impl defmt::Format for Uid {
fn format(&self, f: defmt::Formatter) {
defmt::write!(
f,
"Peripheral {{ x: {:x}, y: {:x}, waf: {}, lum: {}}}",
{ self.x },
{ self.y },
{ self.waf },
{ self.lot_number() },
);
}
}
impl fmt::Debug for Uid {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Uid")
.field("x", &self.x())
.field("y", &self.y())
.field("waf", &self.waf)
.field("lot", &self.lot_number())
.finish()
}
}
fn bcd_to_num(bcd_num: u16) -> u16 {
bcd_num
.to_ne_bytes()
.iter()
.enumerate()
.map(|(i, byte)| (i * 2, (*byte & 0xF0) >> 4, *byte & 0x0F))
.map(|(i, high_nibble, low_nibble)| {
let i: u32 = i.try_into().unwrap_or_default(); // This should never overflow
u16::from(high_nibble) * 10u16.pow(i + 1) + u16::from(low_nibble) * 10u16.pow(i)
})
.sum()
}
impl Uid {
/// X coordinate on wafer in BCD format
#[must_use]
pub fn x_bcd(&self) -> u16 {
self.x
}
/// X coordinate on wafer
#[must_use]
pub fn x(&self) -> u16 {
bcd_to_num(self.x)
}
/// Y coordinate on wafer in BCD format
#[must_use]
pub fn y_bcd(&self) -> u16 {
self.y
}
/// Y coordinate on wafer
#[must_use]
pub fn y(&self) -> u16 {
bcd_to_num(self.y)
}
/// Wafer number
#[must_use]
pub fn wafer_number(&self) -> u8 {
self.waf
}
/// Lot number
#[must_use]
pub fn lot_number(&self) -> &str {
// Lets ignore the last byte, because it is a '\0' character.
// TODO: change to core::ffi::CStr
// SAFETY: It is assumed that the lot number only contains valid ASCII characters
unsafe { str::from_utf8_unchecked(&self.lot[..6]) }
}
}
/// Size of integrated flash
#[derive(Debug)]
#[repr(C)]
pub struct FlashSize(u16);
const FLASH_PTR: u32 = 0x1FFF_F7CC;
impl FlashSize {
fn ptr() -> *const Self {
FLASH_PTR as *const _
}
/// Returns a wrapped reference to the value in flash memory
#[must_use]
pub fn get() -> &'static Self {
// SAFETY: The FlashSize pointer is definitly correct and as it is only ever shared immutable
// mutliple references to it are fine.
unsafe { &*Self::ptr() }
}
}
impl FlashSize {
/// Read flash size in kilobytes
#[must_use]
pub fn kilo_bytes(&self) -> u16 {
self.0
}
/// Read flash size in bytes
#[must_use]
pub fn bytes(&self) -> usize {
usize::from(self.kilo_bytes()) * 1024
}
}