Implement SerialLink CTS

Cargo.toml

@@ -2,7 +2,7 @@
 members = ["agon-light-emulator-debugger"]
 
 [workspace.package]
-version = "0.9.32"
+version = "0.9.33"
 edition = "2021"
 authors = ["Tom Morton <[email protected]>"]
 license = "GPL-3.0"
@@ -41,4 +41,4 @@ raw_tty = "0.1.0"
 
 [workspace.dependencies]
 #agon-cpu-emulator = { path = "../agon-cpu-emulator" }
-agon-cpu-emulator = { git = "https://github.com/tomm/agon-cpu-emulator.git", rev="6ac7dd0696c6a24c2aa29433ed513f7d77bee14e"}
+agon-cpu-emulator = { git = "https://github.com/tomm/agon-cpu-emulator.git", rev="2cd16d251be608d2a0f2dae8cc3e930f216cedf2"}

src/ez80_serial_links.rs

@@ -9,6 +9,7 @@ impl SerialLink for DummySerialLink {
         println!("{}_send: 0x{:02x}", self.name, byte);
     }
     fn recv(&mut self) -> Option<u8> { None }
+    fn read_clear_to_send(&mut self) -> bool { true }
 }
 
 pub struct Ez80ToVdpSerialLink {
@@ -30,6 +31,7 @@ impl SerialLink for Ez80ToVdpSerialLink {
             }
         }
     }
+    fn read_clear_to_send(&mut self) -> bool { true }
 }
 
 pub struct Ez80ToHostSerialLink {
@@ -71,4 +73,7 @@ impl SerialLink for Ez80ToHostSerialLink {
             Err(_) => None
         }
     }
+    fn read_clear_to_send(&mut self) -> bool {
+        self.port.read_clear_to_send().unwrap_or(false)
+    }
 }