Enum ag_lcd::Error

#[repr(u8)]
pub enum Error {
    NoPinRS = 0,
    NoPinEN = 1,
    NoPinRW = 2,
    NoPinD0 = 3,
    NoPinD1 = 4,
    NoPinD2 = 5,
    NoPinD3 = 6,
    NoPinD4 = 7,
    NoPinD5 = 8,
    NoPinD6 = 9,
    NoPinD7 = 10,
    None = 11,
    InvalidMode = 12,
    InvalidCode = 13,
}

Error type for LcdDisplay, returned by LcdDisplay::error

LcdDisplay uses an internal error code rather than the standard rust Result pattern because there are only two places in LcdDisplay where an error is returned. Unfortunately, every public function invokes one of those places (which has an Infallible error type, no less) and would be forced to return a result or call unwrap/expect.

This led to a cluttered API in which users had to handle error conditions when calling functions like clear and home. An internal error code which could mostly be ignored except when debugging seemed like a better option.

Variants

NoPinRS = 0

No pin RS

NoPinEN = 1

No pin EN

NoPinRW = 2

No pin RW

NoPinD0 = 3

No pin D0

NoPinD1 = 4

No pin D1

NoPinD2 = 5

No pin D2

NoPinD3 = 6

No pin D3

NoPinD4 = 7

No pin D4

NoPinD5 = 8

No pin D5

NoPinD6 = 9

No pin D6

NoPinD7 = 10

No pin D7

None = 11

No error

InvalidMode = 12

Bus mode is invalid or not set

InvalidCode = 13

Invalid conversion from u8 to Error

Trait Implementations

impl Clone for Error

fn clone(&self) -> Error

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl From<u8> for Error

fn from(v: u8) -> Self

Converts to this type from the input type.

impl PartialEq for Error

fn eq(&self, other: &Error) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Error

impl StructuralPartialEq for Error