Add missing serial files

src/serial/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "serial"
+version = "0.1.0"
+
+[dependencies]
+cortex-m-rt="~0.5"
+cortex-m-semihosting=""
+panic-semihosting = "~0.3"
+microbit="~0.5"

src/serial/examples/main.rs

@@ -0,0 +1,53 @@
+#![no_std]
+#![no_main]
+
+extern crate panic_semihosting;
+extern crate cortex_m_rt as rt;
+extern crate cortex_m_semihosting as sh;
+
+#[macro_use(entry, exception, block)]
+extern crate microbit;
+
+use core::fmt::Write;
+use rt::ExceptionFrame;
+use sh::hio;
+
+use microbit::hal::prelude::*;
+use microbit::hal::delay::Delay;
+use microbit::hal::serial;
+use microbit::hal::serial::BAUD115200;
+
+exception!(HardFault, hard_fault);
+
+fn hard_fault(ef: &ExceptionFrame) -> ! {
+    panic!("{:#?}", ef);
+}
+
+exception!(*, default_handler);
+
+fn default_handler(irqn: i16) {
+    panic!("Unhandled exception (IRQn = {})", irqn);
+}
+
+entry!(main);
+fn main() -> ! {
+    let mut stdout = hio::hstdout().unwrap();
+    writeln!(stdout, "Start").unwrap();
+    if let Some(p) = microbit::Peripherals::take() {
+        // Split GPIO
+        let mut gpio = p.GPIO.split();
+        // Create delay provider
+        let mut delay = Delay::new(p.TIMER0);
+        // Configure RX and TX pins accordingly
+        let tx = gpio.pin24.into_push_pull_output().downgrade();
+        let rx = gpio.pin25.into_floating_input().downgrade();
+        // Configure serial communication
+        let (mut tx, mut rx) = serial::Serial::uart0(p.UART0, tx, rx, BAUD115200).split();
+        write!(tx, "Start\r\n");
+        loop {
+            let val = block!(rx.read()).unwrap();
+            block!(tx.write(val));
+        }
+    }
+    panic!("End");
+}

src/serial/src/main.rs

@@ -0,0 +1,53 @@
+#![no_std]
+#![no_main]
+
+extern crate panic_semihosting;
+extern crate cortex_m_rt as rt;
+extern crate cortex_m_semihosting as sh;
+
+#[macro_use(entry, exception, block)]
+extern crate microbit;
+
+use core::fmt::Write;
+use rt::ExceptionFrame;
+use sh::hio;
+
+use microbit::hal::prelude::*;
+use microbit::hal::delay::Delay;
+use microbit::hal::serial;
+use microbit::hal::serial::BAUD115200;
+
+exception!(HardFault, hard_fault);
+
+fn hard_fault(ef: &ExceptionFrame) -> ! {
+    panic!("{:#?}", ef);
+}
+
+exception!(*, default_handler);
+
+fn default_handler(irqn: i16) {
+    panic!("Unhandled exception (IRQn = {})", irqn);
+}
+
+entry!(main);
+fn main() -> ! {
+    let mut stdout = hio::hstdout().unwrap();
+    writeln!(stdout, "Start").unwrap();
+    if let Some(p) = microbit::Peripherals::take() {
+        // Split GPIO
+        let mut gpio = p.GPIO.split();
+        // Create delay provider
+        let mut delay = Delay::new(p.TIMER0);
+        // Configure RX and TX pins accordingly
+        let tx = gpio.pin24.into_push_pull_output().downgrade();
+        let rx = gpio.pin25.into_floating_input().downgrade();
+        // Configure serial communication
+        let (mut tx, mut rx) = serial::Serial::uart0(p.UART0, tx, rx, BAUD115200).split();
+        write!(tx, "Start\r\n");
+        loop {
+            let val = block!(rx.read()).unwrap();
+            block!(tx.write(val));
+        }
+    }
+    panic!("End");
+}