Upgrade of semihosting changed timing

New semihosting 0.5 does not use error handling,
returns directly and as semihosting is generally slow
this led to missing print statements.

Workaround is to add NOP, which seems sufficient
to let it flush the buffers

Author: AfoHT

examples/binds.rs

@@ -34,10 +34,11 @@ mod app {
 
         rtic::pend(Interrupt::UART0);
 
-        debug::exit(debug::EXIT_SUCCESS); // Exit QEMU simulator
-
         loop {
+            // Exit moved after nop to ensure that rtic::pend gets
+            // to run before exiting
             cortex_m::asm::nop();
+            debug::exit(debug::EXIT_SUCCESS); // Exit QEMU simulator
         }
     }
 

examples/extern_binds.rs

@@ -40,10 +40,11 @@ mod app {
 
         rtic::pend(Interrupt::UART0);
 
-        debug::exit(debug::EXIT_SUCCESS); // Exit QEMU simulator
-
         loop {
             cortex_m::asm::nop();
+            // Exit moved after nop to ensure that rtic::pend gets
+            // to run before exiting
+            debug::exit(debug::EXIT_SUCCESS); // Exit QEMU simulator
         }
     }
 

examples/generics.rs

@@ -39,6 +39,9 @@ mod app {
 
         rtic::pend(Interrupt::UART1);
 
+        // Exit moved after nop to ensure that rtic::pend gets
+        // to run before exiting
+        cortex_m::asm::nop();
         debug::exit(debug::EXIT_SUCCESS); // Exit QEMU simulator
     }
 

examples/hardware.rs

@@ -37,10 +37,11 @@ mod app {
 
         rtic::pend(Interrupt::UART0);
 
-        debug::exit(debug::EXIT_SUCCESS); // Exit QEMU simulator
-
         loop {
+            // Exit moved after nop to ensure that rtic::pend gets
+            // to run before exiting
             cortex_m::asm::nop();
+            debug::exit(debug::EXIT_SUCCESS); // Exit QEMU simulator
         }
     }