Add snake gui app and update os/usr parts. Now snake can run!

os/Cargo.toml

@@ -15,9 +15,8 @@ xmas-elf = "0.7.0"
 volatile = "0.3"
 #virtio-drivers = { git = "https://github.com/rcore-os/virtio-drivers", rev = "4ee80e5" }
 virtio-drivers = { git = "https://github.com/rcore-os/virtio-drivers", rev = "70b5850" }
-
 easy-fs = { path = "../easy-fs" }
-virtio-input-decoder = "0.1.4"
+#virtio-input-decoder = "0.1.4"
 embedded-graphics = "0.7.1"
 tinybmp = "0.3.1"
 

os/src/boards/qemu.rs

@@ -12,7 +12,7 @@ pub type CharDeviceImpl = crate::drivers::chardev::NS16550a<VIRT_UART>;
 
 pub const VIRT_PLIC: usize = 0xC00_0000;
 pub const VIRT_UART: usize = 0x1000_0000;
-
+#[allow(unused)]
 pub const VIRTGPU_XRES: u32 = 1280;
 #[allow(unused)]
 pub const VIRTGPU_YRES: u32 = 800;

os/src/drivers/chardev/ns16550a.rs

@@ -131,7 +131,7 @@ pub struct NS16550a<const BASE_ADDR: usize> {
 
 impl<const BASE_ADDR: usize> NS16550a<BASE_ADDR> {
     pub fn new() -> Self {
-        let mut inner = NS16550aInner {
+        let inner = NS16550aInner {
             ns16550a: NS16550aRaw::new(BASE_ADDR),
             read_buffer: VecDeque::new(),
         };
@@ -141,6 +141,10 @@ impl<const BASE_ADDR: usize> NS16550a<BASE_ADDR> {
             condvar: Condvar::new(),
         }
     }
+
+    pub fn read_buffer_is_empty(&self) -> bool {
+        self.inner.exclusive_session(|inner| inner.read_buffer.is_empty())
+    }
 }
 
 impl<const BASE_ADDR: usize> CharDevice for NS16550a<BASE_ADDR> {

os/src/drivers/input/mod.rs

@@ -1,12 +1,10 @@
 use crate::drivers::bus::virtio::VirtioHal;
 use crate::sync::{Condvar, UPIntrFreeCell};
 use crate::task::schedule;
-use alloc::collections::BTreeMap;
 use alloc::collections::VecDeque;
 use alloc::sync::Arc;
 use core::any::Any;
 use virtio_drivers::{VirtIOHeader, VirtIOInput};
-use virtio_input_decoder::{Decoder, Key, KeyType};
 
 const VIRTIO5: usize = 0x10005000;
 const VIRTIO6: usize = 0x10006000;
@@ -112,7 +110,8 @@ impl InputDevice for VirtIOInputWrapper {
                     | (event.code as u64) << 32
                     | (event.value) as u64;
                 inner.events.push_back(result);
-                println!("[KERN] inputdev_handle_irq: event: {:x}", result);
+                // for test
+                //println!("[KERN] inputdev_handle_irq: event: {:x}", result);
             }
         });
         if count > 0 {

os/src/syscall/fs.rs

@@ -96,4 +96,4 @@ pub fn sys_dup(fd: usize) -> isize {
     let new_fd = inner.alloc_fd();
     inner.fd_table[new_fd] = Some(Arc::clone(inner.fd_table[fd].as_ref().unwrap()));
     new_fd as isize
-}
+}

os/src/syscall/input.rs

@@ -14,4 +14,16 @@ pub fn sys_event_get() ->isize {
         0
     }
 
+}
+
+use crate::drivers::chardev::UART;
+
+/// check UART's read-buffer is empty or not
+pub fn sys_key_pressed()  -> isize {
+    let res =!UART.read_buffer_is_empty();
+    if res {
+        1
+    } else {
+        0
+    }    
 }

os/src/syscall/mod.rs

@@ -28,6 +28,7 @@ const SYSCALL_CONDVAR_WAIT: usize = 1032;
 const SYSCALL_FRAMEBUFFER: usize = 2000;
 const SYSCALL_FRAMEBUFFER_FLUSH: usize = 2001;
 const SYSCALL_EVENT_GET: usize = 3000;
+const SYSCALL_KEY_PRESSED: usize = 3001;
 
 mod fs;
 mod process;
@@ -75,6 +76,7 @@ pub fn syscall(syscall_id: usize, args: [usize; 3]) -> isize {
         SYSCALL_FRAMEBUFFER => sys_framebuffer(),
         SYSCALL_FRAMEBUFFER_FLUSH => sys_framebuffer_flush(),
         SYSCALL_EVENT_GET => sys_event_get(),
+        SYSCALL_KEY_PRESSED => sys_key_pressed(),
         _ => panic!("Unsupported syscall_id: {}", syscall_id),
     }
 }