feat: 修改 SerialTerm 运行逻辑以处理键盘事件，并在退出时记录信息

feat: 注释掉 UbootShell 中的 flush 调用，简化命令发送逻辑

Author: ZR233

ostool/src/sterm/mod.rs

@@ -94,8 +94,8 @@ impl SerialTerm {
 
         while handle.is_running() {
             // 非阻塞读取键盘事件
-            if event::poll(Duration::from_millis(10))?
-                && let Event::Key(key) = event::read()?
+            if event::poll(Duration::from_millis(10)).is_ok()
+                && let Ok(Event::Key(key)) = event::read()
                 && key.kind == KeyEventKind::Press
             {
                 // 检测 Ctrl+A+x 退出序列
@@ -134,7 +134,7 @@ impl SerialTerm {
 
         // 等待接收线程结束
         let _ = rx_handle.join();
-
+        info!("Serial terminal exited");
         Ok(())
     }
 

uboot-shell/src/lib.rs

@@ -170,13 +170,14 @@ impl UbootShell {
     pub fn cmd_without_reply(&mut self, cmd: &str) -> Result<()> {
         self.tx().write_all(cmd.as_bytes())?;
         self.tx().write_all("\n".as_bytes())?;
-        self.tx().flush()?;
+        // self.tx().flush()?;
         // self.wait_for_reply(cmd)?;
         // debug!("cmd ok");
         Ok(())
     }
 
     fn _cmd(&mut self, cmd: &str) -> Result<String> {
+        let _ = self.read_to_end(&mut vec![]);
         let ok_str = "cmd-ok";
         let cmd_with_id = format!("{cmd}&& echo {ok_str}");
         self.cmd_without_reply(&cmd_with_id)?;