use published versions, doc up, update CHANGELOG

examples/exception.rs

@@ -14,30 +14,31 @@ extern crate cortex_m;
 #[macro_use]
 extern crate cortex_m_rt as rt;
 extern crate cortex_m_semihosting as sh;
-extern crate panic_abort;
+extern crate panic_semihosting;
 
 use core::fmt::Write;
 
 use cortex_m::peripheral::syst::SystClkSource;
-use cortex_m::{asm, Peripherals};
+use cortex_m::Peripherals;
 use rt::ExceptionFrame;
 use sh::hio::{self, HStdout};
 
-main!(main);
+entry!(main);
 
 fn main() -> ! {
     let p = Peripherals::take().unwrap();
     let mut syst = p.SYST;
 
+    // configures the system timer to trigger a SysTick exception every second
     syst.set_clock_source(SystClkSource::Core);
-    syst.set_reload(8_000_000); // 1s
+    syst.set_reload(8_000_000); // period = 1s
     syst.enable_counter();
     syst.enable_interrupt();
 
     loop {}
 }
 
-// try commenting out this line: you'll end in `deh` instead of in `sys_tick`
+// try commenting out this line: you'll end in `default_handler` instead of in `sys_tick`
 exception!(SysTick, sys_tick, state: Option<HStdout> = None);
 
 fn sys_tick(state: &mut Option<HStdout>) {
@@ -50,20 +51,14 @@ fn sys_tick(state: &mut Option<HStdout>) {
     }
 }
 
-exception!(DefaultHandler, deh);
+exception!(HardFault, hard_fault);
 
-#[inline(always)]
-fn deh(_nr: u8) {
-    asm::bkpt();
+fn hard_fault(ef: &ExceptionFrame) -> ! {
+    panic!("HardFault at {:#?}", ef);
 }
 
-exception!(HardFault, hf);
+exception!(*, default_handler);
 
-#[inline(always)]
-fn hf(_ef: &ExceptionFrame) -> ! {
-    asm::bkpt();
-
-    loop {}
+fn default_handler(irqn: i16) {
+    panic!("Unhandled exception (IRQn = {})", irqn);
 }
-
-interrupts!(DefaultHandler);