From d547c5c5c9834dbb1dbe000b42e09b22f064f947 Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Fri, 10 Apr 2020 21:47:17 +0200
Subject: Add demo1 stm32f103 example with blinky code

---
 sw/demo1/src/main.rs | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 sw/demo1/src/main.rs

(limited to 'sw/demo1/src')

diff --git a/sw/demo1/src/main.rs b/sw/demo1/src/main.rs
new file mode 100644
index 0000000..80e38b9
--- /dev/null
+++ b/sw/demo1/src/main.rs
@@ -0,0 +1,72 @@
+#![no_main]
+#![no_std]
+
+use cortex_m_rt::ExceptionFrame;
+use cortex_m_semihosting::hio;
+use panic_semihosting as _;
+
+use stm32f1xx_hal::{
+    prelude::*,
+    pac,
+    timer::Timer,
+};
+
+use embedded_hal::digital::v2::{OutputPin, ToggleableOutputPin};
+
+use core::fmt::Write;
+use nb::block;
+
+fn print(step: usize) -> Result<(), core::fmt::Error> {
+    let mut stdout = match hio::hstdout() {
+        Ok(fd) => fd,
+        Err(()) => return Err(core::fmt::Error),
+    };
+
+    let language = "Rust";
+    let ranking = 1;
+
+    write!(stdout, "{}: {} on embedded is #{}!\n", step, language, ranking)?;
+
+    Ok(())
+}
+
+#[cortex_m_rt::entry]
+fn main() -> ! {
+    let cp = cortex_m::Peripherals::take().unwrap();
+    let dp = pac::Peripherals::take().unwrap();
+
+    let mut flash = dp.FLASH.constrain();
+    let mut rcc = dp.RCC.constrain();
+    let clocks = rcc.cfgr.freeze(&mut flash.acr);
+
+    let mut gpiob = dp.GPIOB.split(&mut rcc.apb2);
+
+    // Configure PB14 as output. (LED)
+    let mut led = gpiob.pb14.into_push_pull_output(&mut gpiob.crh);
+    led.set_low().unwrap();
+
+    let mut timer = Timer::syst(cp.SYST, &clocks).start_count_down(1.hz());
+
+    let mut step = 0;
+    print(step).unwrap();
+
+    loop {
+        for _ in 0..5 {
+            led.toggle().unwrap();
+            block!(timer.wait()).ok();
+        }
+
+        print(step).unwrap();
+        step += 1;
+    }
+}
+
+#[cortex_m_rt::exception]
+fn HardFault(ef: &ExceptionFrame) -> ! {
+    panic!("HardFault at {:#?}", ef);
+}
+
+#[cortex_m_rt::exception]
+fn DefaultHandler(irqn: i16) {
+    panic!("Unhandled exception (IRQn = {})", irqn);
+}
-- 
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