feat(sleep): Tell the caller of epic_sleep() if an interrupt happened

epicardium/drivers/sleep.c

@@ -15,6 +15,7 @@
 #include "mxc_pins.h"
 
 #include <stdint.h>
+#include <limits.h>
 
 /* Most code is taken and adapted rom EvKitExamples/LP/main.c */
 
@@ -208,9 +209,15 @@ void sleep_deepsleep(void)
 	MAX77650_setEN_SBB2(0b110);
 }
 
-void epic_sleep(uint32_t ms)
+int epic_sleep(uint32_t ms)
 {
 	/* Allow the interrupt module to break us out of a call to
 	 * epic_sleep() */
-	ulTaskNotifyTake(pdTRUE, pdMS_TO_TICKS(ms));
+	uint32_t count = ulTaskNotifyTake(pdTRUE, pdMS_TO_TICKS(ms));
+
+	if (count == 0) {
+		return 0;
+	} else {
+		return INT_MAX;
+	}
 }