fix examples

examples/embedded_linux_epd4in2/src/main.rs

@@ -26,7 +26,10 @@ use lin_hal::Delay;
 // from https://github.com/rudihorn/max31865/blob/extra_examples/examples/rpi.rs
 // (slightly changed now as OutputPin doesn't provide is_high and is_low anymore)
 extern crate embedded_hal;
-use embedded_hal::digital::{InputPin};
+use embedded_hal::{
+    digital::{InputPin},
+}; 
+use embedded_hal::prelude::*;
 
 struct HackInputPin<'a> {
     pin: &'a Pin
@@ -59,7 +62,7 @@ impl<'a> InputPin for HackInputPin<'a> {
 *
 */
 
-fn main() {
+fn main() -> Result<(), std::io::Error> {
 
     // Configure SPI
     // Settings are taken from 
@@ -97,7 +100,7 @@ fn main() {
     rst.set_direction(Direction::Out).expect("rst Direction");
     rst.set_value(1).expect("rst Value set to 1");   
 
-    let delay = Delay {};
+    let mut delay = Delay {};
 
     
  
@@ -105,7 +108,7 @@ fn main() {
 
     //TODO: wait for Digital::InputPin
     //fixed currently with the HackInputPin, see further above
-    let mut epd4in2 = EPD4in2::new(spi, cs, busy_in, dc, rst, delay).expect("eink inialize error");
+    let mut epd4in2 = EPD4in2::new(spi, cs, busy_in, dc, rst, &mut delay).expect("eink inialize error");
 
     //let mut buffer =  [0u8, epd4in2.get_width() / 8 * epd4in2.get_height()];
     let mut buffer = [0u8; 15000];
@@ -129,7 +132,7 @@ fn main() {
     epd4in2.update_frame(graphics.get_buffer()).expect("display and transfer error");
     epd4in2.display_frame().expect("Display Frame Error");
  
-    epd4in2.delay_ms(3000);
+    delay.delay_ms(3000u16);
 
     epd4in2.clear_frame().expect("clear frame error");
 
@@ -150,7 +153,7 @@ fn main() {
     epd4in2.update_partial_frame(circle_graphics.get_buffer(), 160,240, 32, 32).expect("Partial Window Error");
     epd4in2.display_frame().expect("Display Frame Error");
 
-    epd4in2.delay_ms(3000);
+    delay.delay_ms(3000u16);
 
 
 
@@ -162,7 +165,7 @@ fn main() {
     epd4in2.update_frame(graphics.get_buffer()).expect("display and transfer error");
     epd4in2.display_frame().expect("Display Frame Error");
 
-    epd4in2.delay_ms(3000);
+    delay.delay_ms(3000u16);
 
-    epd4in2.sleep().expect("sleeping error");
+    epd4in2.sleep()
 }