Relax extern "C" requirement on handler function signature.

Cargo.toml

@@ -18,7 +18,7 @@ paste = "1.0"
 
 [dependencies.hopter_proc_macro]
 git = "https://github.com/ZhiyaoMa98/hopter-procedural-macro.git"
-tag = "v0.1.4"
+tag = "v0.1.5"
 
 [dependencies.hopter_conf_params]
 git = "https://github.com/ZhiyaoMa98/hopter-conf-params.git"

examples/tests/interrupt/unwind/simple.rs

@@ -51,7 +51,7 @@ fn main(_cp: cortex_m::Peripherals) {
 
 /// Get invoked approximately every 1 second.
 #[handler(TIM2)]
-extern "C" fn tim2_handler() {
+fn tim2_handler() {
     static IRQ_CNT: AtomicUsize = AtomicUsize::new(0);
     let prev_cnt = IRQ_CNT.fetch_add(1, Ordering::SeqCst);
 

examples/tests/sync/channel/try_consume_from_isr.rs

@@ -77,7 +77,7 @@ fn produce_function(producer: Producer<usize, 2>) {
 
 /// Get invoked approximately every 1 second.
 #[handler(TIM2)]
-extern "C" fn tim2_handler() {
+fn tim2_handler() {
     static COUNT: AtomicUsize = AtomicUsize::new(0);
     COUNT.fetch_add(1, Ordering::SeqCst);
 

examples/tests/sync/channel/try_produce_from_isr.rs

@@ -79,7 +79,7 @@ fn consume_function(consumer: Consumer<usize, 2>) {
 
 /// Get invoked approximately every 1 second.
 #[handler(TIM2)]
-extern "C" fn tim2_handler() {
+fn tim2_handler() {
     static COUNT: AtomicUsize = AtomicUsize::new(0);
     let prev_cnt = COUNT.fetch_add(1, Ordering::SeqCst);
 

examples/tests/sync/mailbox/notify_from_isr.rs

@@ -74,7 +74,7 @@ fn listener_function() {
 
 /// Get invoked approximately every 1 second.
 #[handler(TIM2)]
-extern "C" fn tim2_handler() {
+fn tim2_handler() {
     static IRQ_CNT: AtomicUsize = AtomicUsize::new(0);
 
     MAILBOX.notify_allow_isr();

examples/tests/sync/semaphore/try_down_from_isr.rs

@@ -74,7 +74,7 @@ fn up_function() {
 
 /// Get invoked approximately every 1 second.
 #[handler(TIM2)]
-extern "C" fn tim2_handler() {
+fn tim2_handler() {
     // Only run this handler for three times. If running more than three times,
     // the test task must have been stuck.
     static COUNT: AtomicUsize = AtomicUsize::new(0);

examples/tests/sync/semaphore/try_up_from_isr.rs

@@ -74,7 +74,7 @@ fn down_function() {
 
 /// Get invoked approximately every 1 second.
 #[handler(TIM2)]
-extern "C" fn tim2_handler() {
+fn tim2_handler() {
     // Only run this handler for three times. If running more than three times,
     // the test task must have been stuck.
     static COUNT: AtomicUsize = AtomicUsize::new(0);