Update embedded-graphics requirement from 0.4.7 to 0.8.1 in /examples…

…/twi-ssd1306 (#456)

* Update embedded-graphics requirement in /examples/twi-ssd1306

Updates the requirements on [embedded-graphics](https://github.com/embedded-graphics/embedded-graphics) to permit the latest version.
- [Release notes](https://github.com/embedded-graphics/embedded-graphics/releases)
- [Changelog](https://github.com/embedded-graphics/embedded-graphics/blob/master/CHANGELOG.md)
- [Commits](embedded-graphics/embedded-graphics@embedded-graphics-0.4.7...embedded-graphics-v0.8.1)

---
updated-dependencies:
- dependency-name: embedded-graphics
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update ssd1306 driver to match, and fix code.

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Andrew Walbran <qwandor@google.com>

examples/twi-ssd1306/Cargo.toml

@@ -10,8 +10,8 @@ publish = false
 
 [dependencies]
 cortex-m-rt = "0.7.0"
-ssd1306 = "0.2.6"
-embedded-graphics = "0.4.7"
+ssd1306 = "0.8.4"
+embedded-graphics = "0.8.1"
 panic-semihosting = "0.6.0"
 
 [dependencies.nrf52832-hal]

examples/twi-ssd1306/src/main.rs

@@ -4,11 +4,9 @@
 extern crate panic_semihosting;
 
 use cortex_m_rt::entry;
-
-use embedded_graphics::fonts::Font6x8;
-use embedded_graphics::prelude::*;
-use ssd1306::prelude::*;
-use ssd1306::Builder;
+use embedded_graphics::{mono_font::ascii::FONT_5X8, text::Text};
+use embedded_graphics::{mono_font::MonoTextStyle, pixelcolor::BinaryColor, prelude::*};
+use ssd1306::{prelude::*, I2CDisplayInterface, Ssd1306};
 
 #[cfg(feature = "52832")]
 use nrf52832_hal::{
@@ -42,17 +40,17 @@ fn main() -> ! {
 
     let i2c = Twim::new(p.TWIM0, pins, twim::Frequency::K100);
 
-    let mut disp: GraphicsMode<_> = Builder::new().connect_i2c(i2c).into();
+    let interface = I2CDisplayInterface::new(i2c);
+    let mut disp = Ssd1306::new(interface, DisplaySize128x64, DisplayRotation::Rotate0)
+        .into_buffered_graphics_mode();
 
     disp.init().expect("Display initialization");
     disp.flush().expect("Cleans the display");
 
-    disp.draw(
-        Font6x8::render_str("Hello Rust!")
-            .with_stroke(Some(1u8.into()))
-            .translate(Coord::new(10, 24))
-            .into_iter(),
-    );
+    let style = MonoTextStyle::new(&FONT_5X8, BinaryColor::On);
+    Text::new("Hello Rust!", Point::new(10, 24), style)
+        .draw(&mut disp)
+        .expect("Drawing text");
 
     disp.flush().expect("Render display");