systic example for qemu

examples/systic.rs

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+//! examples/systic.rs
+
+#![deny(unsafe_code)]
+#![deny(warnings)]
+#![no_main]
+#![no_std]
+
+use cortex_m_semihosting::{debug, hprintln};
+use lm3s6965::Interrupt;
+use panic_semihosting as _;
+
+#[rtic::app(device = lm3s6965)]
+const APP: () = {
+    #[init]
+    fn init(cx: init::Context) {
+        let mut syst = cx.core.SYST;
+        syst.set_reload(1000);
+        syst.enable_interrupt();
+        syst.enable_counter();
+
+        hprintln!("init").unwrap();
+    }
+
+    #[idle]
+    fn idle(_: idle::Context) -> ! {
+        hprintln!("idle").unwrap();
+        loop {
+            cortex_m::asm::nop();
+        }
+    }
+
+    #[task(binds = SysTick)]
+    fn t(_: t::Context) {
+        static mut COUNTER: i32 = 0;
+        *COUNTER += 1;
+        hprintln!("SysTick #{}", COUNTER).unwrap();
+        if *C == 10 {
+            debug::exit(debug::EXIT_SUCCESS);
+        }
+    }
+};