first commit

Examples/rustacean/src/lib.rs

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+#![no_std]
+#![feature(c_size_t)]
+use arduboy_rust::prelude::*;
+
+const BOTTOM: u8 = 64;
+const RIGHT_END: u8 = 128;
+
+const CHAR_WIDTH: u8 = 6;
+const CHAR_HEIGHT: u8 = 8;
+
+const MSG: &str = "  I'm now a \0";
+const MSG2: &str = "Rustacean <3\0";
+
+struct Environment {
+    x: u8,
+    y: u8,
+    msg_len: u8,
+}
+impl Environment {
+    unsafe fn setup(&mut self) {
+        arduboy.begin();
+        arduboy.set_frame_rate(60);
+        let msg_len = MSG.len();
+        debug_assert!(msg_len <= (core::u8::MAX as c_size_t));
+        self.msg_len = msg_len as u8;
+    }
+
+    unsafe fn loop_(&mut self) {
+        if !arduboy.next_frame() {
+            return;
+        }
+
+        if UP.pressed() && self.y > 0 {
+            self.y -= 1;
+        }
+        if RIGHT.pressed() && self.x < RIGHT_END - CHAR_WIDTH * self.msg_len {
+            self.x += 1;
+        }
+        if LEFT.pressed() && self.x > 0 {
+            self.x -= 1;
+        }
+        if DOWN.pressed() && self.y < BOTTOM - CHAR_HEIGHT * 2 {
+            self.y += 1;
+        }
+
+        if (A | B).pressed() {
+            sound.tone(0xff, 0x3f);
+        }
+
+        arduboy.clear();
+        arduboy.set_cursor(self.x.into(), self.y.into());
+        arduboy.print(MSG);
+        arduboy.set_cursor(self.x.into(), (self.y + 9).into());
+        arduboy.print(MSG2);
+        arduboy.display();
+    }
+}
+
+static mut E: Environment = Environment {
+    x: 0,
+    y: 0,
+    msg_len: 0,
+};
+
+#[no_mangle]
+pub unsafe extern "C" fn setup() {
+    E.setup();
+}
+
+#[no_mangle]
+#[export_name = "loop"]
+pub unsafe extern "C" fn loop_() {
+    E.loop_();
+}