Gate uart enable behind cargo feature

Cargo.toml

@@ -14,6 +14,7 @@ publish = false
 [features]
 unstable = []
 realtime = []
+noserial = []
 
 #[lib]
 #name = "nucleus"

device.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
-cargo xbuild --target=targets/aarch64-vesper-metta.json --release && \
+cargo xbuild --target=targets/aarch64-vesper-metta.json --release --features "noserial" && \
 sh .cargo/runscript.sh target/aarch64-vesper-metta/release/vesper && \
 cp target/aarch64-vesper-metta/release/vesper.bin /Volumes/boot/vesper && \
 diskutil eject /Volumes/boot/

src/platform/uart.rs

@@ -150,6 +150,7 @@ impl MiniUart {
     }
 
     ///Set baud rate and characteristics (115200 8N1) and map to GPIO
+    #[cfg(not(feature = "noserial"))]
     pub fn init(&self) {
         // initialize UART
         self.AUX_ENABLES.modify(AUX_ENABLES::MINI_UART_ENABLE::SET);
@@ -180,7 +181,11 @@ impl MiniUart {
             .write(AUX_MU_CNTL::RX_EN::Enabled + AUX_MU_CNTL::TX_EN::Enabled);
     }
 
+    #[cfg(feature = "noserial")]
+    pub fn init(&self) {}
+
     /// Send a character
+    #[cfg(not(feature = "noserial"))]
     pub fn send(&self, c: char) {
         // wait until we can send
         loop_until(|| self.AUX_MU_LSR.is_set(AUX_MU_LSR::TX_EMPTY));
@@ -189,7 +194,11 @@ impl MiniUart {
         self.AUX_MU_IO.set(c as u32);
     }
 
+    #[cfg(feature = "noserial")]
+    pub fn send(&self, _c: char) {}
+
     /// Receive a character
+    #[cfg(not(feature = "noserial"))]
     pub fn getc(&self) -> char {
         // wait until something is in the buffer
         loop_until(|| self.AUX_MU_LSR.is_set(AUX_MU_LSR::DATA_READY));
@@ -205,6 +214,11 @@ impl MiniUart {
         }
     }
 
+    #[cfg(feature = "noserial")]
+    pub fn getc(&self) -> char {
+        '\n'
+    }
+
     /// Display a string
     pub fn puts(&self, string: &str) {
         for c in string.chars() {