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#![no_std]

/// This crate contains a variety of universal error types which can be used to universally model
/// conditions which can typically arise for certain peripherals.
///
/// When used by HAL implementations, they allow drivers and applications alike to generically
/// handle those situations without the error handling being specific to the hardware it is
/// supposed to run on (which is usually not possible to implement in drivers).
///
/// All of the enums in this crate are marked as `#[non_exhaustive]` to allow for additions of new
/// error kinds without requiring a breaking change and version bump.

/// A SPI specific error.
///
/// This error type contains errors specific to SPI peripherals. Also it has an `Impl` kind to pass
/// through implementation specific errors occuring while trying to use a SPI peripheral.
#[non_exhaustive]
pub enum SpiError {
    /// The peripheral receive buffer was overrun
    Overrun,
    /// Multiple devices on the SPI bus are trying across each other, e.g. in a multi-master setup
    ModeFault,
    /// CRC does not match the received data
    CRCError,
    /// Received data does not conform to the peripheral configuration
    FrameFormatError,
    /// Implementation specific error (shared across all peripheral specific error kinds)
    Impl(ImplError),
}

/// An I2C specific error.
///
/// This error type contains errors specific to I2C peripherals. Also it has an `Impl` kind to pass
/// through implementation specific errors occuring while trying to use an I2C peripheral.
#[non_exhaustive]
pub enum I2cError {
    /// An unspecific bus error occured
    BusError,
    /// The arbitration was lost, e.g. electrical problems with the clock signal
    ArbitrationLoss,
    /// A bus operation received a NACK, e.g. due to the addressed device not being available on
    /// the bus or device not being ready to process any requests at the moment
    NACK,
    /// The peripheral receive buffer was overrun
    Overrun,
    /// The peripheral send buffer ran out of data
    Underrun,
    /// SMBus Error checking byte mismatch
    PacketErrorChecking,
    /// SMBus Timeout error
    Timeout,
    /// SMBus Alert received
    Alert,
    /// Implementation specific error (shared across all peripheral specific error kinds)
    Impl(ImplError),
}

/// A universal implementation specific error.
///
/// These error kinds can be used to signal implementation specific errors unrelated to the
/// specific peripheral. This will be used for all sorts of connectivity problems, e.g. if an
/// adapter to the peripheral is used or the target peripheral is connected to indirectly (like bus
/// expanders) or an operating system is controlling the access and denying access.
#[non_exhaustive]
pub enum ImplError {
    /// Unspecified internal driver error
    Internal,
    /// Connection lost, e.g. device adapter was unplugged
    Disconnected,
    /// Ran out of memory while trying to allocate required buffers
    OutOfMemory,
    /// Operation timed out, please retry
    TimedOut,
    /// Peripheral is sleeping or in standby
    Asleep,
    /// Peripheral is powered down
    PowerDown,
    /// The peripheral cannot work with the specified settings
    InvalidConfiguration,
    /// Could not open connection to peripheral
    CouldNotOpen,
    /// No sufficient permissions to connect to peripheral
    PermissionDenied,
}