Fixing bug w/ subsequent calls to tone().

http://code.google.com/p/arduino/issues/detail?id=397

1 files changed, 6 insertions, 2 deletions

diff --git a/cores/arduino/Tone.cpp b/cores/arduino/Tone.cpp
index 8bdc5f7..c3910e7 100755
--- a/cores/arduino/Tone.cpp
+++ b/cores/arduino/Tone.cpp
@@ -533,8 +533,12 @@ ISR(TIMER2_COMPA_vect)
   }
   else
   {
-    disableTimer(2);
-    *timer2_pin_port &= ~(timer2_pin_mask);  // keep pin low after stop
+    // need to call noTone() so that the tone_pins[] entry is reset, so the
+    // timer gets initialized next time we call tone().
+    // XXX: this assumes timer 2 is always the first one used.
+    noTone(tone_pins[0]);
+//    disableTimer(2);
+//    *timer2_pin_port &= ~(timer2_pin_mask);  // keep pin low after stop
   }
 }