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//! SPI traits

pub mod blocking;
pub mod nb;

/// Clock polarity
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Polarity {
    /// Clock signal low when idle
    IdleLow,
    /// Clock signal high when idle
    IdleHigh,
}

/// Clock phase
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Phase {
    /// Data in "captured" on the first clock transition
    CaptureOnFirstTransition,
    /// Data in "captured" on the second clock transition
    CaptureOnSecondTransition,
}

/// SPI mode
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct Mode {
    /// Clock polarity
    pub polarity: Polarity,
    /// Clock phase
    pub phase: Phase,
}

/// Helper for CPOL = 0, CPHA = 0
pub const MODE_0: Mode = Mode {
    polarity: Polarity::IdleLow,
    phase: Phase::CaptureOnFirstTransition,
};

/// Helper for CPOL = 0, CPHA = 1
pub const MODE_1: Mode = Mode {
    polarity: Polarity::IdleLow,
    phase: Phase::CaptureOnSecondTransition,
};

/// Helper for CPOL = 1, CPHA = 0
pub const MODE_2: Mode = Mode {
    polarity: Polarity::IdleHigh,
    phase: Phase::CaptureOnFirstTransition,
};

/// Helper for CPOL = 1, CPHA = 1
pub const MODE_3: Mode = Mode {
    polarity: Polarity::IdleHigh,
    phase: Phase::CaptureOnSecondTransition,
};