add example for epd2in13bc using chromatic color besides black and white

examples/epd2in13bc.rs

@@ -0,0 +1,148 @@
+#![deny(warnings)]
+
+use embedded_graphics::{
+    fonts::{Font12x16, Font6x8, Text},
+    prelude::*,
+    primitives::{Circle, Line},
+    style::PrimitiveStyle,
+    text_style,
+};
+use embedded_hal::prelude::*;
+use epd_waveshare::{
+    color::*,
+    epd2in13bc::{Display2in13bc, Epd2in13bc},
+    graphics::{Display, DisplayRotation},
+    prelude::*,
+};
+use linux_embedded_hal::{
+    spidev::{self, SpidevOptions},
+    sysfs_gpio::Direction,
+    Delay, Pin, Spidev,
+};
+
+// activate spi, gpio in raspi-config
+// needs to be run with sudo because of some sysfs_gpio permission problems and follow-up timing problems
+// see https://github.com/rust-embedded/rust-sysfs-gpio/issues/5 and follow-up issues
+
+fn main() -> Result<(), std::io::Error> {
+    let busy = Pin::new(24); // GPIO 24, board J-18
+    busy.export().expect("busy export");
+    while !busy.is_exported() {}
+    busy.set_direction(Direction::In).expect("busy Direction");
+
+    let dc = Pin::new(25); // GPIO 25, board J-22
+    dc.export().expect("dc export");
+    while !dc.is_exported() {}
+    dc.set_direction(Direction::Out).expect("dc Direction");
+    // dc.set_value(1).expect("dc Value set to 1");
+
+    let rst = Pin::new(17); // GPIO 17, board J-11
+    rst.export().expect("rst export");
+    while !rst.is_exported() {}
+    rst.set_direction(Direction::Out).expect("rst Direction");
+    // rst.set_value(1).expect("rst Value set to 1");
+
+    // Configure Digital I/O Pin to be used as Chip Select for SPI
+    let cs = Pin::new(26); // CE0, board J-24, GPIO 8 -> doesn work. use this from 2in19 example which works
+    cs.export().expect("cs export");
+    while !cs.is_exported() { }
+    cs.set_direction(Direction::Out).expect("CS Direction");
+    cs.set_value(1).expect("CS Value set to 1");
+
+    // Configure SPI
+    // Settings are taken from
+    let mut spi = Spidev::open("/dev/spidev0.0").expect("spidev directory");
+    let options = SpidevOptions::new()
+        .bits_per_word(8)
+        .max_speed_hz(10_000_000)
+        .mode(spidev::SpiModeFlags::SPI_MODE_0)
+        .build();
+    spi.configure(&options).expect("spi configuration");
+
+    let mut delay = Delay {};
+
+    let mut epd2in13 =
+        Epd2in13bc::new(&mut spi, cs, busy, dc, rst, &mut delay).expect("eink initalize error");
+
+    println!("Test all the rotations");
+    let mut display = Display2in13bc::default();
+    let mut display_chromatic = Display2in13bc::default();
+
+    display.set_rotation(DisplayRotation::Rotate0);
+    draw_text(&mut display, "Rotation 0!", 5, 50);
+
+    display.set_rotation(DisplayRotation::Rotate90);
+    draw_text(&mut display, "Rotation 90!", 5, 50);
+
+    display.set_rotation(DisplayRotation::Rotate180);
+    draw_text(&mut display, "Rotation 180!", 5, 50);
+
+    display.set_rotation(DisplayRotation::Rotate270);
+    draw_text(&mut display, "Rotation 270!", 5, 50);
+
+    epd2in13.update_and_display_frame(&mut spi, &display.buffer(), &mut delay)
+        .expect("display frame new graphics");
+
+    println!("First frame done. Waiting 5s");
+    delay.delay_ms(5000u16);
+
+    println!("Now test new graphics with default rotation:");
+    display.clear_buffer(Color::White);
+    display_chromatic.clear_buffer(Color::White);
+    // keep both displays on same rotation
+    display_chromatic.set_rotation(DisplayRotation::Rotate270); 
+
+    // draw a analog clock
+    let _ = Circle::new(Point::new(64, 	64), 40)
+        .into_styled(PrimitiveStyle::with_stroke(Black, 1))
+        .draw(&mut display);
+    let _ = Line::new(Point::new(64, 64), Point::new(30, 40))
+        .into_styled(PrimitiveStyle::with_stroke(Black, 4))
+        .draw(&mut display);
+    let _ = Line::new(Point::new(64, 64), Point::new(80, 40))
+        .into_styled(PrimitiveStyle::with_stroke(Black, 1))
+        .draw(&mut display);
+
+    // draw white on Red background
+    let _ = Text::new("It's working-WoB!", Point::new(90, 10))
+        .into_styled(text_style!(
+            font = Font6x8,
+            text_color = White,
+            background_color = Black
+        ))
+        .draw(&mut display_chromatic);
+
+    // use bigger/different font
+    let _ = Text::new("It's working-WoB!", Point::new(90, 40))
+        .into_styled(text_style!(
+            font = Font12x16,
+            text_color = White,
+            background_color = Black
+        ))
+        .draw(&mut display_chromatic);
+
+    epd2in13.update_color_frame(&mut spi, &display.buffer(), &display_chromatic.buffer())?;
+    epd2in13
+        .display_frame(&mut spi, &mut delay)
+        .expect("display frame new graphics");
+    println!("Second frame done. Waiting 5s");
+    delay.delay_ms(5000u16);
+
+    display.clear_buffer(Color::White);
+    display_chromatic.clear_buffer(Color::White);
+    epd2in13.update_color_frame(&mut spi, &display.buffer(), &display_chromatic.buffer())?;
+    epd2in13.display_frame(&mut spi, &mut delay)?;
+
+    println!("Finished tests - going to sleep"); 
+    epd2in13.sleep(&mut spi, &mut delay)
+}
+
+fn draw_text(display: &mut Display2in13bc, text: &str, x: i32, y: i32) {
+    let _ = Text::new(text, Point::new(x, y))
+        .into_styled(text_style!(
+            font = Font6x8,
+            text_color = Black,
+            background_color = White
+        ))
+        .draw(display);
+}