Add blinky example for STM32F1 bluepill board (#1007)

Code taken from stm32f3_blinky example with LED port adapted to bluepill
board.
Port initialization and README from v1 rtic-examples with slight edits.

1 files changed, 73 insertions, 0 deletions

diff --git a/examples/stm32f1_bluepill_blinky/src/main.rs b/examples/stm32f1_bluepill_blinky/src/main.rs
new file mode 100644
index 0000000..08cf1cc
--- /dev/null
+++ b/examples/stm32f1_bluepill_blinky/src/main.rs
@@ -0,0 +1,73 @@
+#![deny(unsafe_code)]
+#![deny(warnings)]
+#![no_main]
+#![no_std]
+
+use panic_rtt_target as _;
+use rtic::app;
+use rtic_monotonics::systick::prelude::*;
+use rtt_target::{rprintln, rtt_init_print};
+use stm32f1xx_hal::gpio::{Output, PinState, PushPull, PC13};
+use stm32f1xx_hal::prelude::*;
+
+systick_monotonic!(Mono, 1000);
+
+#[app(device = stm32f1xx_hal::pac, peripherals = true, dispatchers = [SPI1])]
+mod app {
+    use super::*;
+
+    #[shared]
+    struct Shared {}
+
+    #[local]
+    struct Local {
+        led: PC13<Output<PushPull>>,
+        state: bool,
+    }
+
+    #[init]
+    fn init(cx: init::Context) -> (Shared, Local) {
+        // Setup clocks
+        let mut flash = cx.device.FLASH.constrain();
+        let rcc = cx.device.RCC.constrain();
+
+        // Initialize the systick interrupt & obtain the token to prove that we did
+        Mono::start(cx.core.SYST, 36_000_000);
+
+        rtt_init_print!();
+        rprintln!("init");
+
+        let _clocks = rcc
+            .cfgr
+            .use_hse(8.MHz())
+            .sysclk(36.MHz())
+            .pclk1(36.MHz())
+            .freeze(&mut flash.acr);
+
+        // Setup LED
+        let mut gpioc = cx.device.GPIOC.split();
+        let led = gpioc
+            .pc13
+            .into_push_pull_output_with_state(&mut gpioc.crh, PinState::Low);
+
+        // Schedule the blinking task
+        blink::spawn().ok();
+
+        (Shared {}, Local { led, state: false })
+    }
+
+    #[task(local = [led, state])]
+    async fn blink(cx: blink::Context) {
+        loop {
+            rprintln!("blink");
+            if *cx.local.state {
+                cx.local.led.set_high();
+                *cx.local.state = false;
+            } else {
+                cx.local.led.set_low();
+                *cx.local.state = true;
+            }
+            Mono::delay(1000.millis()).await;
+        }
+    }
+}