Add async support

Cargo.toml

@@ -18,6 +18,8 @@ edition = "2021"
 [dependencies]
 embedded-graphics-core = { version = "0.4", optional = true }
 embedded-hal = { version = "1.0.0-rc.1" }
+embedded-hal-async = { optional = true, version = "1.0.0-rc.1" }
+
 bit_field = "0.10.1"
 
 [dev-dependencies]
@@ -54,12 +56,13 @@ required-features = ["linux-dev"]
 
 [features]
 # Remove the linux-dev feature to build the tests on non  unix systems
-default = ["graphics", "linux-dev", "epd2in13_v3"]
+default = ["async", "graphics", "linux-dev", "epd2in13_v3"]
 
 graphics = ["embedded-graphics-core"]
 epd2in13_v2 = []
 epd2in13_v3 = []
 linux-dev = []
+async = ["dep:embedded-hal-async"]
 
 # Offers an alternative fast full lut for type_a displays, but the refreshed screen isnt as clean looking
 type_a_alternative_faster_lut = []

examples/epd1in54_no_graphics.rs

@@ -58,11 +58,11 @@ fn main() -> Result<(), SPIError> {
 
     // Setup of the needed pins is finished here
     // Now the "real" usage of the eink-waveshare-rs crate begins
-    let mut epd = Epd1in54::new(&mut spi, busy, dc, rst, &mut delay, Some(5))?;
+    let mut epd = Epd1in54::new(&mut spi, busy, dc, rst, &mut delay, Some(5)).await?;
 
     // Clear the full screen
-    epd.clear_frame(&mut spi, &mut delay)?;
-    epd.display_frame(&mut spi, &mut delay)?;
+    epd.clear_frame(&mut spi, &mut delay).await?;
+    epd.display_frame(&mut spi, &mut delay).await?;
 
     // Speeddemo
     epd.set_lut(&mut spi, &mut delay, Some(RefreshLut::Quick))?;