tone() minimum frequency is 1 Hz

PaulStoffregen · Dec 9, 2017 · bb72c33 · bb72c33
1 parent 1cf5d3b
commit bb72c33
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/teensy3/Tone.cpp b/teensy3/Tone.cpp
@@ -73,6 +73,7 @@ void tone(uint8_t pin, uint16_t frequency, uint32_t duration)
 	} else {
 		count = 0xFFFFFFFD;
 	}
+	if (frequency < 1) frequency = 1; // minimum is 1 Hz
 	usec = (float)500000.0 / (float)frequency;
 	config = portConfigRegister(pin);