1 files changed, 49 insertions, 0 deletions
diff --git a/project/Core/Inc/tone.h b/project/Core/Inc/tone.h
new file mode 100644
index 0000000..b30e252
--- /dev/null
+++ b/project/Core/Inc/tone.h
@@ -0,0 +1,49 @@
+/*
+ * tone.h
+ *
+ *  Created on: May 14, 2022
+ *      Author: bruce
+ */
+
+#ifndef INC_TONE_H_
+#define INC_TONE_H_
+
+#include "dac.h"
+
+/**
+ * SysTick handler. Since tones are controlled by software, the SysTick timer
+ * must be used accurately manage the times.
+ */
+void SysTick_Handler();
+
+/**
+ * Accessor for the counter. Useful for knowing what the current "time" is
+ * in the system.
+ */
+uint32_t get_counter ();
+
+void reset_counter ();
+
+/**
+ * Utility function that converts a frequency into a Systick timer ticks.
+ */
+uint32_t hertz_to_systicks (float hertz);
+
+/**
+ * Adds a tone to be played.
+ */
+uint8_t add_tone (uint8_t note, uint8_t velocity);
+
+/**
+ * Removes a tone from the current group of tones that can be played.
+ */
+uint8_t remove_tone (uint8_t note);
+
+
+/**
+ * Starts playing any tones that have been added.
+ */
+void play_tones ();
+
+
+#endif /* INC_TONE_H_ */