ESP

common/src/cm.rs

@@ -0,0 +1,5 @@
+/// CPU to Modem
+pub enum CMMessage {
+	Ping(u32),
+	Pong(u32),
+}

common/src/lib.rs

@@ -0,0 +1,15 @@
+pub mod cm;
+pub mod mc;
+
+pub const VERSION: u32 = 1;
+
+enum State {
+	/// Not ready, not even pinged
+	Idle,
+	/// Ping failed
+	Fail,
+	/// Waiting for pong
+	Pinging,
+	/// Ready to work
+	Ready,
+}

common/src/mc.rs

@@ -0,0 +1,26 @@
+use crate::{cm::CMMessage, State};
+
+/// Modem to CPU
+pub enum MCMessage {
+	Ping(u32),
+	Pong(u32),
+}
+
+/// Modem-side connection driver
+pub struct MCConnection<SPI> {
+	spi: SPI,
+	state: State,
+}
+
+impl<SPI> MCConnection<SPI> where SPI: embedded_hal::spi::SpiDevice {
+	pub fn new(spi: SPI) -> Self {
+		Self {
+			spi,
+			state: State::Idle,
+		}
+	}
+
+	fn handle_message(message: CMMessage) {
+		
+	}
+}