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