use 115200 baud and print panic over serial

.cargo/config.toml

@@ -2,7 +2,7 @@
 target = "avr-specs/avr-atmega328p.json"
 
 [target.'cfg(target_arch = "avr")']
-runner = "ravedude nano-new -cb 57600"
+runner = "ravedude nano-new -cb 115200"
 
 [unstable]
 build-std = ["core"]

Cargo.lock

@@ -32,7 +32,7 @@ dependencies = [
  "arduino-hal",
  "embedded-hal 1.0.0",
  "nb 1.1.0",
- "panic-halt",
+ "panic-serial",
  "proc-macro2",
  "ufmt",
 ]
@@ -142,10 +142,13 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8d5439c4ad607c3c23abf66de8c8bf57ba8adcd1f129e699851a6e43935d339d"
 
 [[package]]
-name = "panic-halt"
-version = "0.2.0"
+name = "panic-serial"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "de96540e0ebde571dc55c73d60ef407c653844e6f9a1e2fdbd40c07b9252d812"
+checksum = "c3afc60d58b0825ea32dd8d8a2796098f7b87ad3b9392cace3b6dc79e450afd9"
+dependencies = [
+ "ufmt",
+]
 
 [[package]]
 name = "paste"

Cargo.toml

@@ -11,10 +11,10 @@ test = false
 bench = false
 
 [dependencies]
-panic-halt = "0.2.0"
 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

@@ -1,7 +1,15 @@
 #![no_std]
 #![no_main]
 
-use panic_halt as _;
+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>
+  >
+);
 
 #[arduino_hal::entry]
 fn main() -> ! {
@@ -19,6 +27,10 @@ fn main() -> ! {
      */
 
     let mut led = pins.d13.into_output();
+    let serial = arduino_hal::default_serial!(dp, pins, 115200);
+    let mut serial = share_serial_port_with_panic(serial);
+
+    ufmt::uwriteln!(&mut serial, "Hello from Arduino!").unwrap_infallible();
 
     loop {
         led.toggle();