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Implementation of the embedded-hal traits for the HD44780.

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In light of `set_cursor_pos` working exclusively in terms of screen coordinates, I needed a function that let me set offscreen addresses to values to work with scrolling.

I looked into this repository as an example to learn more about handling errors within a driver, but what I found out was that the possible errors from embedded_hal::blocking::i2c::Write#write (for...

Currently the api makes it hard to output dynamic data on platforms that do not have an allocator, (and thus no acess to the `format!()` macro). Allowing the use of...

Based on https://github.com/JohnDoneth/hd44780-driver/issues/12

Hi, Thanks for the library. I have a display that is pretty glitchy, and while I'm trying to figure that out, in the meantime I'd like to be able to...

Now that Rust has nightly support for AVR it would be neat to have an example for this crate using [avr-hal](https://github.com/Rahix/avr-hal) for the ubiquitous Arduino UNO.