Serial PTT support in soundmodem

[m17rt] / m17app / src / serial.rs

diff --git a/m17app/src/serial.rs b/m17app/src/serial.rs
new file mode 100644 (file)
index 0000000..d3eec19
--- /dev/null
+++ b/m17app/src/serial.rs
@@ -0,0 +1,47 @@
+use serialport::SerialPort;
+
+use crate::soundmodem::Ptt;
+
+/// The pin on the serial port which is driving PTT
+pub enum PttPin {
+    // Ready To Send (RTS)
+    Rts,
+    // Data Terminal ready (DTR)
+    Dtr,
+}
+
+pub struct SerialPtt {
+    port: Box<dyn SerialPort>,
+    pin: PttPin,
+}
+
+impl SerialPtt {
+    pub fn available_ports() -> impl Iterator<Item = String> {
+        serialport::available_ports()
+            .unwrap_or_else(|_| vec![])
+            .into_iter()
+            .map(|i| i.port_name)
+    }
+
+    pub fn new(port_name: &str, pin: PttPin) -> Self {
+        // TODO: error handling
+        let port = serialport::new(port_name, 9600).open().unwrap();
+        Self { port, pin }
+    }
+}
+
+impl Ptt for SerialPtt {
+    fn ptt_on(&mut self) {
+        let _ = match self.pin {
+            PttPin::Rts => self.port.write_request_to_send(true),
+            PttPin::Dtr => self.port.write_data_terminal_ready(true),
+        };
+    }
+
+    fn ptt_off(&mut self) {
+        let _ = match self.pin {
+            PttPin::Rts => self.port.write_request_to_send(false),
+            PttPin::Dtr => self.port.write_data_terminal_ready(false),
+        };
+    }
+}