SAMD21 has only 10 bits DAC.

sensorium · Jan 6, 2021 · f49e8d0 · f49e8d0
1 parent 1680579
commit f49e8d0
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/AudioConfigSAMD21.h b/AudioConfigSAMD21.h
@@ -1,11 +1,13 @@
 #ifndef AUDIOCONFIGSAMD21_H
 #define AUDIOCONFIGSAMD21_H
 
+/* Note: SAMD21 has 12 bits ADC, but only 10 bits DAC. See https://github.com/sensorium/Mozzi/issues/75 */
+#define AUDIO_BITS 10
 
 /** @ingroup core
 */
-/* Used internally to put the 0-biased generated audio into the centre of the output range (12 bits) */
-#define AUDIO_BIAS ((uint16_t) 2048)
+/* Used internally to put the 0-biased generated audio into the centre of the output range (10 bits) */
+#define AUDIO_BIAS ((uint16_t) 1 << (AUDIO_BITS - 1))
 
 
 #define AUDIO_CHANNEL_1_PIN DAC0