os/src/drivers/chardev/mod.rs

@@ -6,6 +6,7 @@ use lazy_static::*;
 pub use ns16550a::NS16550a;
 
 pub trait CharDevice {
+    fn init(&self);
     fn read(&self) -> u8;
     fn write(&self, ch: u8);
     fn handle_irq(&self);

os/src/drivers/chardev/ns16550a.rs

@@ -135,7 +135,7 @@ impl<const BASE_ADDR: usize> NS16550a<BASE_ADDR> {
             ns16550a: NS16550aRaw::new(BASE_ADDR),
             read_buffer: VecDeque::new(),
         };
-        inner.ns16550a.init();
+        //inner.ns16550a.init();
         Self {
             inner: unsafe { UPIntrFreeCell::new(inner) },
             condvar: Condvar::new(),
@@ -144,6 +144,12 @@ impl<const BASE_ADDR: usize> NS16550a<BASE_ADDR> {
 }
 
 impl<const BASE_ADDR: usize> CharDevice for NS16550a<BASE_ADDR> {
+    fn init(&self){
+        let mut inner = self.inner.exclusive_access();
+        inner.ns16550a.init();
+        drop(inner);
+    }
+
     fn read(&self) -> u8 {
         loop {
             let mut inner = self.inner.exclusive_access();

os/src/gui/paint.rs

@@ -28,7 +28,14 @@ impl DrawingBoard {
             .draw(&mut self.graphics)
             .ok();
     }
+    fn unpaint(&mut self) {
+        Rectangle::with_center(self.latest_pos, Size::new(RECT_SIZE, RECT_SIZE))
+            .into_styled(PrimitiveStyle::with_stroke(Rgb888::BLACK, 1))
+            .draw(&mut self.graphics)
+            .ok();
+    }
     pub fn move_rect(&mut self, dx: i32, dy: i32) {
+        self.unpaint();
         self.latest_pos.x += dx;
         self.latest_pos.y += dy;
         self.paint();

os/src/main.rs

@@ -28,6 +28,8 @@ mod task;
 mod timer;
 mod trap;
 
+use crate::drivers::chardev::CharDevice;
+use crate::drivers::chardev::UART;
 //use syscall::create_desktop; //for test
 
 core::arch::global_asm!(include_str!("entry.asm"));
@@ -55,6 +57,7 @@ lazy_static! {
 pub fn rust_main() -> ! {
     clear_bss();
     mm::init();
+    UART.init();
     println!("KERN: init gpu");
     let _gpu = GPU_DEVICE.clone();
     println!("KERN: init keyboard");