BSP update

- Add basic LED BSP
- Moved generic examples to the HAL
- Updated rust edition to 2021
- Updated README to provide full instructions for flashing and building
- Added jlink.gdb file to command line flashing

src/leds.rs

@@ -0,0 +1,92 @@
+use va108xx_hal::{
+    gpio::{
+        porta::{Parts, PA10, PA6, PA7},
+        Output, Pin, PushPull,
+    },
+    pac::{IOCONFIG, PORTA},
+    prelude::*,
+};
+
+pub type LD2 = PA10<Output<PushPull>>;
+pub type LD3 = PA7<Output<PushPull>>;
+pub type LD4 = PA6<Output<PushPull>>;
+
+pub struct Leds {
+    leds: [Led; 3],
+}
+
+impl Leds {
+    pub fn new(led_parts: Parts, iocfg: &mut IOCONFIG, porta: &mut PORTA) -> Self {
+        let led2 = led_parts.pa10.into_push_pull_output(iocfg, porta);
+        let led3 = led_parts.pa7.into_push_pull_output(iocfg, porta);
+        let led4 = led_parts.pa6.into_push_pull_output(iocfg, porta);
+        Leds {
+            leds: [led2.into(), led3.into(), led4.into()],
+        }
+    }
+}
+
+impl core::ops::Deref for Leds {
+    type Target = [Led];
+
+    fn deref(&self) -> &[Led] {
+        &self.leds
+    }
+}
+
+impl core::ops::DerefMut for Leds {
+    fn deref_mut(&mut self) -> &mut [Led] {
+        &mut self.leds
+    }
+}
+
+impl core::ops::Index<usize> for Leds {
+    type Output = Led;
+
+    fn index(&self, i: usize) -> &Led {
+        &self.leds[i]
+    }
+}
+
+impl core::ops::IndexMut<usize> for Leds {
+    fn index_mut(&mut self, i: usize) -> &mut Led {
+        &mut self.leds[i]
+    }
+}
+
+pub struct Led {
+    pin: Pin<Output<PushPull>>,
+}
+
+macro_rules! ctor {
+	($($ldx:ident),+) => {
+		$(
+			impl From<$ldx> for Led {
+				fn from(led: $ldx) -> Self {
+					Led {
+						pin: led.downgrade(),
+					}
+				}
+			}
+		)+
+	}
+}
+
+ctor!(LD2, LD3, LD4);
+
+impl Led {
+    /// Turns the LED off
+    pub fn off(&mut self) {
+        self.pin.set_low().ok();
+    }
+
+    /// Turns the LED on
+    pub fn on(&mut self) {
+        self.pin.set_high().ok();
+    }
+
+    /// Toggles the LED
+    pub fn toggle(&mut self) {
+        self.pin.toggle().ok();
+    }
+}

src/lib.rs

@@ -0,0 +1,3 @@
+#![no_std]
+
+pub mod leds;

src/main.rs

@@ -1,3 +0,0 @@
-fn main() {
-    println!("Hello, world!");
-}