Implement setting square wave duty cycle

1 files changed, 5 insertions, 1 deletions

diff --git a/include/xas/synth.h b/include/xas/synth.h
index ca83c69..cb0b3bd 100644
--- a/include/xas/synth.h
+++ b/include/xas/synth.h
@@ -8,6 +8,7 @@
 #include <xas/audio.h>
 
 #define XAS_SYNTH_DEFAULT_GAIN      1.0f
+#define XAS_SYNTH_DEFAULT_DUTY      1.0f
 #define XAS_SYNTH_DEFAULT_FREQUENCY 2600 /* Hz */
 
 enum xas_synth_type {
@@ -38,7 +39,8 @@ struct _xas_synth {
     xas_synth_sample_callback sample;
 
     float phase,
-          gain;
+          gain,
+          duty;
 
     size_t frequency;
 };
@@ -51,6 +53,8 @@ void xas_synth_destroy(xas_synth *synth);
 
 void xas_synth_set_gain(xas_synth *synth, float gain);
 
+void xas_synth_set_duty(xas_synth *synth, float duty);
+
 void xas_synth_set_frequency(xas_synth *synth, size_t frequency);
 
 void xas_synth_set_type(xas_synth *synth, enum xas_synth_type type);