2 files changed, 5 insertions, 2 deletions
diff --git a/ppmsum.cpp b/ppmsum.cpp
index 3da7d78..75faa17 100644
--- a/ppmsum.cpp
+++ b/ppmsum.cpp
@@ -21,12 +21,13 @@ void PPMSum::irq() {
 	if(sr & 0x01) {
 		// Timeout.
 		
-		// TODO: Indicate failsafe.
+		synced = false;
 		
 	} else if(sr & 0x02) {
 		// Period.
 		
 		if(TIM4.CCR1 > 5000) {
+			synced = true;
 			index = 0;
 		} else {
 			index++;
diff --git a/ppmsum.h b/ppmsum.h
index 3c4ce79..efc7287 100644
--- a/ppmsum.h
+++ b/ppmsum.h
@@ -11,7 +11,6 @@ class PPMSum {
 		static PPMSum* self;
 		
 		uint8_t index;
-		uint16_t channels[16];
 		
 		void irq();
 	
@@ -20,6 +19,9 @@ class PPMSum {
 			self = this;
 		}
 		
+		bool synced;
+		uint16_t channels[16];
+		
 		void enable();
 };