Make the non-working skeleton work

firmware/include/pentabug/lifecycle.h

@@ -5,13 +5,17 @@
 #include <stdint.h>
 
 extern jmp_buf app_jmp_buf;
-extern uint8_t should_stop;
+extern volatile uint8_t should_stop;
 
+// this code does not work ... i have no idea why
+// putting the exact same statements at the calling line works ...
+/*
 // initialize lifecycle, stopped if return != 0
-inline static int enter_app(void) {
+static int enter_app(void) {
 	should_stop = 0;
 	return setjmp(app_jmp_buf);
 }
+*/
 
 // stop the running app
 inline static void stop_app(void) {

firmware/lib/lifecycle.c

@@ -1,4 +1,4 @@
 #include <pentabug/lifecycle.h>
 
 jmp_buf app_jmp_buf;
-uint8_t should_stop;
+volatile uint8_t should_stop;

firmware/main.c

@@ -22,23 +22,24 @@ static inline void reset_hw(void) {
 }
 
 static inline void run_app(struct app_t* app) {
-	if(enter_app()) {
-		// this is the exit
-		if(app->cleanup) {
-			app->cleanup();
+	should_stop = 0;
+	if(setjmp(app_jmp_buf) == 0) {
+		if(app->init) {
+			app->init();
 		}
 
-		return;
+		for(;;) {
+			app->run();
+			test_stop_app();
+		}
 	}
 
-	if(app->init) {
-		app->init();
+	// this is the exit
+	if(app->cleanup) {
+		app->cleanup();
 	}
 
-	for(;;) {
-		app->run();
-		test_stop_app();
-	}
+	return;
 }
 
 int main(void) {
@@ -57,8 +58,6 @@ int main(void) {
 
 		run_app(&apps[app_index]);
 
-		for(;;);
-
 		if(direction > 0) {
 			app_index++;