Added blinky button demo to the examples

Author: andresovela

examples/blinky-button-demo/Cargo.toml

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+[package]
+name = "blinky-button-demo"
+version = "0.1.0"
+authors = ["Andres O. Vela"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+cortex-m = "0.6.2"
+rtt-target = {version = "0.2.0", features = ["cortex-m"] }
+nrf52832-hal = { features = ["rt"], path = "../../nrf52832-hal" }
+
+[dependencies.embedded-hal]
+version = "0.2.3"
+features = ["unproven"]

examples/blinky-button-demo/Embed.toml

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+[probe]
+# The index of the probe in the connected probe list.
+# probe_index = 0
+# The protocol to be used for communicating with the target.
+protocol = "Swd"
+# The speed in kHz of the data link to the target.
+# speed = 1337
+
+[flashing]
+# Whether or not the target should be flashed.
+enabled = true
+# Whether or not the target should be halted after flashing.
+halt_afterwards = false
+# Whether or not bytes erased but not rewritten with data from the ELF
+# should be restored with their contents before erasing.
+restore_unwritten_bytes = false
+# The path where an SVG of the assembled flash layout should be written to.
+# flash_layout_output_path = "out.svg"
+
+[general]
+# The chip name of the chip to be debugged.
+chip = "nRF52832"
+# A list of chip descriptions to be loaded during runtime.
+chip_descriptions = []
+# The default log level to be used.
+log_level = "Warn"
+
+[rtt]
+# Whether or not an RTTUI should be opened after flashing.
+# This is exclusive and cannot be used with GDB at the moment.
+enabled = true
+# A list of channel associations to be displayed. If left empty, all channels are displayed.
+channels = [
+    # { up = 0, down = 0, name = "name" }
+]
+# The duration in ms for which the logger should retry to attach to RTT.
+timeout = 3000
+# Whether timestamps in the RTTUI are enabled
+show_timestamps = true
+
+[gdb]
+# Whether or not a GDB server should be opened after flashing.
+# This is exclusive and cannot be used with RTT at the moment.
+enabled = false
+# The connection string in host:port format wher the GDB server will open a socket.
+# gdb_connection_string

examples/blinky-button-demo/src/main.rs

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+#![no_main]
+#![no_std]
+
+use core::sync::atomic::{AtomicUsize, Ordering};
+use embedded_hal::digital::v2::InputPin;
+use embedded_hal::digital::v2::OutputPin;
+use nrf52832_hal as hal;
+use nrf52832_hal::gpio::Level;
+
+#[panic_handler] // panicking behavior
+fn panic(_: &core::panic::PanicInfo) -> ! {
+    loop {
+        cortex_m::asm::bkpt();
+    }
+}
+
+#[cortex_m_rt::entry]
+fn main() -> ! {
+    rtt_init_print!();
+    let p = hal::pac::Peripherals::take().unwrap();
+    let port0 = hal::gpio::p0::Parts::new(p.P0);
+    let button = port0.p0_13.into_pullup_input();
+    let mut led = port0.p0_17.into_push_pull_output(Level::Low);
+
+    rprintln!("Blinky button demo starting");
+    loop {
+        if button.is_high().unwrap() {
+            led.set_high().unwrap();
+        } else {
+            led.set_low().unwrap();
+        }
+    }
+}