make it possible to build without simulator SDL lib, to make crosscompile possible

Cargo.toml

@@ -15,11 +15,12 @@ reqwest = { version = "0.12",  default-features = false, features = ["http2","ru
 serde = { version = "1.0.219", features = ["derive"] }
 serde_json = "1.0.143"
 bincode = "2.0.1"
-embedded-graphics-simulator = "0.7.0"
 
 
+embedded-graphics-simulator = { version = "0.7.0", optional = true }
+
 [features]
-default = ["simulator"] # use simulator by default
-simulator = []
+default = ["simulator"]
+simulator = ["embedded-graphics-simulator"]  # enable only for simulator builds
 epaper = []
 paper-png = []

build_aarch_epaper.sh

@@ -0,0 +1 @@
+cargo build --release --no-default-features --features=epaper --target=aarch64-unknown-linux-gnu

src/display/mod.rs

@@ -47,8 +47,13 @@ mod epaper;
 #[cfg(feature = "epaper")]
 pub use epaper::EPaper;
 
-mod image_sim;
-mod simulator;
 
-pub use image_sim::ImageSimulator;
+#[cfg(feature = "simulator")]
+mod simulator;
+#[cfg(feature = "simulator")]
 pub use simulator::Simulator;
+
+#[cfg(feature = "paper-png")]
+mod image_sim;
+#[cfg(feature = "paper-png")]
+pub use image_sim::ImageSimulator;

src/main.rs

@@ -38,7 +38,7 @@ fn main() {
     let display = display::Simulator::new();
 
     #[cfg(feature = "epaper")]
-    let display = display::EPaper::new();
+    let display = display::EPaper::new().unwrap();
 
     let mut app = app::App::new(98685373, display);
     app.init();