Fix PWMAudio::write(buffer, len) (earlephilhower#2202)

earlephilhower · web-flow · commit 903908906779 · 2024-06-05T13:08:08.000-07:00
PWMAudio was only ever writing one half the buffer passed in because
of an off-by-2 error.  Fixes the sine output in KeyboardPiano.
diff --git a/libraries/PWMAudio/src/PWMAudio.cpp b/libraries/PWMAudio/src/PWMAudio.cpp
@@ -242,8 +242,8 @@ size_t PWMAudio::write(const uint8_t *buffer, size_t size) {
             return writtenSize;
         } else {
             p++;
-            size -= 4;
-            writtenSize += 4;
+            size -= 2;
+            writtenSize += 2;
         }
     }
     return writtenSize;
@@ -288,4 +288,4 @@ void PWMAudio::find_pacer_fraction(int target, uint16_t *numerator, uint16_t *de
     last_target = target;
     *numerator = bestNum;
     *denominator = bestDenom;
-}
+}
