1 files changed, 2 insertions, 1 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++;