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+/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2017.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, distribute, and sell this
+ software and its documentation for any purpose is hereby granted
+ without fee, provided that the above copyright notice appear in
+ all copies and that both that the copyright notice and this
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
+ software without specific, written prior permission.
+
+ The author disclaims all warranties with regard to this
+ software, including all implied warranties of merchantability
+ and fitness. In no event shall the author be liable for any
+ special, indirect or consequential damages or any damages
+ whatsoever resulting from loss of use, data or profits, whether
+ in an action of contract, negligence or other tortious action,
+ arising out of or in connection with the use or performance of
+ this software.
+*/
+
+/** \file
+ *
+ * Header file for AudioOutput.c.
+ */
+
+#ifndef _AUDIO_OUTPUT_H_
+#define _AUDIO_OUTPUT_H_
+
+ /* Includes: */
+ #include <avr/io.h>
+ #include <avr/wdt.h>
+ #include <avr/power.h>
+ #include <avr/pgmspace.h>
+ #include <avr/interrupt.h>
+ #include <stdbool.h>
+
+ #include "Descriptors.h"
+ #include "Config/AppConfig.h"
+
+ #include <LUFA/Drivers/Board/LEDs.h>
+ #include <LUFA/Drivers/USB/USB.h>
+ #include <LUFA/Platform/Platform.h>
+
+ /* Macros: */
+ /** LED mask for the library LED driver, to indicate that the USB interface is not ready. */
+ #define LEDMASK_USB_NOTREADY LEDS_LED1
+
+ /** LED mask for the library LED driver, to indicate that the USB interface is enumerating. */
+ #define LEDMASK_USB_ENUMERATING (LEDS_LED2 | LEDS_LED3)
+
+ /** LED mask for the library LED driver, to indicate that the USB interface is ready. */
+ #define LEDMASK_USB_READY (LEDS_LED2 | LEDS_LED4)
+
+ /** LED mask for the library LED driver, to indicate that an error has occurred in the USB interface. */
+ #define LEDMASK_USB_ERROR (LEDS_LED1 | LEDS_LED3)
+
+ /** Scale factor used to convert the floating point frequencies and ratios into a fixed point number */
+ #define SCALE_FACTOR 65536
+
+ /** Base (lowest) allowable MIDI note frequency */
+ #define BASE_FREQUENCY 27.5
+
+ /** Ratio between each note in an octave */
+ #define NOTE_OCTIVE_RATIO 1.05946
+
+ /** Lowest valid MIDI pitch index */
+ #define BASE_PITCH_INDEX 21
+
+ /** Number of samples in the virtual sample table (can be expanded to lower maximum frequency, but allow for
+ * more simultaneous notes due to the reduced amount of processing time needed when the samples are spaced out)
+ */
+ #define VIRTUAL_SAMPLE_TABLE_SIZE 512
+
+ /** Sample table increments per period for the base MIDI note frequency */
+ #define BASE_INCREMENT (((F_CPU / VIRTUAL_SAMPLE_TABLE_SIZE / 2) / BASE_FREQUENCY))
+
+ /* Type Defines: */
+ typedef struct
+ {
+ uint8_t LRUAge;
+ uint8_t Pitch;
+ uint32_t TableIncrement;
+ uint32_t TablePosition;
+ } DDSNoteData;
+
+ /* Function Prototypes: */
+ void SetupHardware(void);
+
+ void EVENT_USB_Device_Connect(void);
+ void EVENT_USB_Device_Disconnect(void);
+ void EVENT_USB_Device_ConfigurationChanged(void);
+ void EVENT_USB_Device_UnhandledControlRequest(void);
+
+#endif
+