new blinky example, cargo.toml update

Cargo.toml

@@ -36,10 +36,15 @@ debug = true
 lto = false
 
 [profile.release]
-lto = true
+# Problematic because RTT won't work
+lto = false
 debug = true
 opt-level = "s"
 
+[profile.release-lto]
+inherits = "release"
+lto = true
+
 [[example]]
 name = "timer-ticks"
 required-features = ["rt"]

examples/blinky-pac.rs

@@ -0,0 +1,48 @@
+
+//! Blinky examples using only the PAC
+//!
+//! Additional note on LEDs:
+//! Pulling the GPIOs low makes the LEDs blink. See REB1
+//! schematic for more details.
+#![no_main]
+#![no_std]
+
+use cortex_m_rt::entry;
+use panic_halt as _;
+use va108xx as pac;
+
+// REB LED pin definitions. All on port A
+const LED_D2: u32 = 1 << 10;
+const LED_D3: u32 = 1 << 7;
+const LED_D4: u32 = 1 << 6;
+
+#[entry]
+fn main() -> ! {
+    let dp = pac::Peripherals::take().unwrap();
+    // Enable all peripheral clocks
+    dp.SYSCONFIG
+        .peripheral_clk_enable
+        .modify(|_, w| unsafe { w.bits(0xffffffff) });
+    dp.PORTA
+        .dir()
+        .modify(|_, w| unsafe { w.bits(LED_D2 | LED_D3 | LED_D4) });
+    dp.PORTA
+        .datamask()
+        .modify(|_, w| unsafe { w.bits(LED_D2 | LED_D3 | LED_D4) });
+    for _ in 0..10 {
+        dp.PORTA
+            .clrout()
+            .write(|w| unsafe { w.bits(LED_D2 | LED_D3 | LED_D4) });
+        cortex_m::asm::delay(5_000_000);
+        dp.PORTA
+            .setout()
+            .write(|w| unsafe { w.bits(LED_D2 | LED_D3 | LED_D4) });
+        cortex_m::asm::delay(5_000_000);
+    }
+    loop {
+        dp.PORTA
+            .togout()
+            .write(|w| unsafe { w.bits(LED_D2 | LED_D3 | LED_D4) });
+        cortex_m::asm::delay(25_000_000);
+    }
+}