ssd1309 0.4.0

`display-interface` compatible driver for the SSD1309 OLED display controller
Documentation 
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//! Helpers for use in examples and tests
//! Code from https://github.com/jamwaffles/sh1106/blob/master/src/test_helpers.rs
//! Copyright (c) 2018 James Waples MIT

use display_interface::{DisplayError, WriteOnlyDataCommand};
use embedded_hal::{
    blocking::{
        i2c,
        spi::{self, Transfer},
    },
    digital::v2::OutputPin,
};

#[allow(dead_code)]
#[derive(Debug, Clone, Copy)]
pub struct SpiStub;

impl spi::Write<u8> for SpiStub {
    type Error = ();

    fn write(&mut self, _buf: &[u8]) -> Result<(), ()> {
        Ok(())
    }
}

impl Transfer<u8> for SpiStub {
    type Error = ();

    fn transfer<'a>(&mut self, buf: &'a mut [u8]) -> Result<&'a [u8], ()> {
        Ok(buf)
    }
}

#[allow(dead_code)]
#[derive(Debug, Clone, Copy)]
pub struct I2cStub;

impl i2c::Write for I2cStub {
    type Error = ();

    fn write(&mut self, _addr: u8, _buf: &[u8]) -> Result<(), ()> {
        Ok(())
    }
}

#[allow(dead_code)]
#[derive(Debug, Clone, Copy)]
pub struct PinStub;

impl OutputPin for PinStub {
    type Error = ();

    fn set_high(&mut self) -> Result<(), ()> {
        Ok(())
    }

    fn set_low(&mut self) -> Result<(), ()> {
        Ok(())
    }
}

#[allow(dead_code)]
#[derive(Debug, Clone, Copy)]
pub struct StubInterface;

impl WriteOnlyDataCommand for StubInterface {
    fn send_commands(
        &mut self,
        _cmd: display_interface::DataFormat<'_>,
    ) -> Result<(), DisplayError> {
        Ok(())
    }
    fn send_data(&mut self, _buf: display_interface::DataFormat<'_>) -> Result<(), DisplayError> {
        Ok(())
    }
}