sensor.c: abort after 3 unsuccessful trials

1 files changed, 6 insertions, 0 deletions

diff --git a/sensor.c b/sensor.c
index 834c6bf..706817e 100644
--- a/sensor.c
+++ b/sensor.c
@@ -38,7 +38,13 @@ int main() {
 	int bit = -3;
 	char data[5];
 	memset(&data[0], 0, 5);
+	int trials = 3;
 	while ((bit != 40) || ((data[0]+data[1]+data[2]+data[3]-data[4]) % 255 != 0)) {
+		trials--;
+		if (trials <= 0) {
+			fprintf(stderr, "Failed to obtain valid reading within 3 trials.\n");
+			return -1;
+		}
 		sleep(2);
 		if (bit > -3)
 			fprintf(stderr, ".");