mks979b 0.1.0

no_std driver for the MKS 979B Atmosphere to Vacuum Transducer. Based on the embedded-hal traits.
Documentation 
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use core::fmt;

/// Used to represent a number in the scientific notation format
/// used by the MKS 979B. Not abstracted in a different crate as the
/// formats used in many intruments differ in a considerable manner
#[derive(Debug, Copy, Clone)]
pub struct SciNumber979b {
    integer: u8,
    decimal: u8,
    epositive: bool,
    exponent: u8,
}
#[derive(Debug)]
pub struct SciNumberError;
impl SciNumber979b {
    /// Tries to build a number that is valid for the instrument.
    pub fn try_new(
        integer: u8,
        decimal: u8,
        epositive: bool,
        exponent: u8,
    ) -> Result<Self, SciNumberError> {
        if integer < 10 && decimal < 100 && exponent < 11 {
            Ok(SciNumber979b {
                integer,
                decimal,
                epositive,
                exponent,
            })
        } else {
            Err(SciNumberError)
        }
    }
    pub fn into_u32(x: SciNumber979b) -> u32 {
        (x.integer as u32) << 24
            | (x.decimal as u32) << 16
            | (x.epositive as u32) << 8
            | (x.exponent as u32)
    }
    pub fn from_ascii(s: &[u8]) -> Result<Self, SciNumberError> {
        let len = s.len();
        if len < 7 {
            Err(SciNumberError)
        } else {
            for (i, ch) in s.iter().enumerate().take(len) {
                if i == 1 || i == 4 || i == 5 {
                    continue;
                }
                if *ch < b'0' || *ch > b'9' {
                    return Err(SciNumberError);
                }
            }
            let epositive = s[5] == b'+';
            Ok(if s.len() < 8 {
                Self {
                    integer: s[0] - b'0',
                    decimal: (s[2] - b'0') * 10 + s[3] - b'0',
                    epositive,
                    exponent: s[6] - b'0',
                }
            } else {
                Self {
                    integer: s[0] - b'0',
                    decimal: (s[2] - b'0') * 10 + s[3] - b'0',
                    epositive,
                    exponent: (s[6] - b'0') * 10 + s[7] - b'0',
                }
            })
        }
    }
}
impl fmt::Display for SciNumber979b {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let exponent_sign = if self.epositive { '+' } else { '-' };

        write!(
            f,
            "{:01}.{:02}E{}{:01}",
            self.integer, self.decimal, exponent_sign, self.exponent,
        )
    }
}