custom panic to preserve type checking

Cargo.lock

@@ -32,7 +32,6 @@ dependencies = [
  "arduino-hal",
  "embedded-hal 1.0.0",
  "nb 1.1.0",
- "panic-serial",
  "proc-macro2",
  "ufmt",
 ]
@@ -141,15 +140,6 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8d5439c4ad607c3c23abf66de8c8bf57ba8adcd1f129e699851a6e43935d339d"
 
-[[package]]
-name = "panic-serial"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c3afc60d58b0825ea32dd8d8a2796098f7b87ad3b9392cace3b6dc79e450afd9"
-dependencies = [
- "ufmt",
-]
-
 [[package]]
 name = "paste"
 version = "1.0.15"

Cargo.toml

@@ -14,7 +14,6 @@ bench = false
 ufmt = "0.2.0"
 nb = "1.1.0"
 embedded-hal = "1.0"
-panic-serial = { version = "0.1.2", features = ["full"] }
 
 [dependencies.arduino-hal]
 git = "https://github.com/rahix/avr-hal"

src/main.rs

@@ -3,13 +3,38 @@
 
 use arduino_hal::prelude::*;
 
-panic_serial::impl_panic_handler!(
-  arduino_hal::usart::Usart<
-    arduino_hal::pac::USART0,
-    arduino_hal::port::Pin<arduino_hal::port::mode::Input, arduino_hal::hal::port::PD0>,
-    arduino_hal::port::Pin<arduino_hal::port::mode::Output, arduino_hal::hal::port::PD1>
-  >
-);
+// NOTE: 115200 @ 16MHz is 3.5% off, try 9600 or 1M if it causes issues (https://wormfood.net/avrbaudcalc.php)
+const SERIAL_BAUD: u32 = 115200;
+
+#[cfg(not(doc))]
+#[panic_handler]
+fn panic(info: &core::panic::PanicInfo) -> ! {
+    // disable interrupts - firmware has panicked so no ISRs should continue running
+    // avr_device::interrupt::disable();
+
+    // SAFETY: Main code aborted.
+    let dp = unsafe { arduino_hal::Peripherals::steal() };
+    let pins = arduino_hal::pins!(dp);
+    let mut serial = arduino_hal::default_serial!(dp, pins, SERIAL_BAUD);
+
+    ufmt::uwriteln!(&mut serial, "Firmware panic!\r").unwrap_infallible();
+    if let Some(loc) = info.location() {
+        ufmt::uwriteln!(
+            &mut serial,
+            "  At {}:{}:{}\r",
+            loc.file(),
+            loc.line(),
+            loc.column(),
+        )
+        .unwrap_infallible();
+    }
+
+    let mut led = pins.d13.into_output();
+    loop {
+        led.toggle();
+        arduino_hal::delay_ms(100);
+    }
+}
 
 #[arduino_hal::entry]
 fn main() -> ! {
@@ -17,9 +42,7 @@ fn main() -> ! {
     let pins = arduino_hal::pins!(dp);
 
     let mut led = pins.d13.into_output();
-    // NOTE: 115200 @ 16MHz is 3.5% off, try 9600 or 1M if it causes issues (https://wormfood.net/avrbaudcalc.php)
-    let serial = arduino_hal::default_serial!(dp, pins, 115200);
-    let mut serial = share_serial_port_with_panic(serial);
+    let mut serial = arduino_hal::default_serial!(dp, pins, SERIAL_BAUD);
 
     ufmt::uwriteln!(&mut serial, "Hello from Arduino!").unwrap_infallible();