diff options
Diffstat (limited to 'Projects/MIDIToneGenerator')
| -rw-r--r-- | Projects/MIDIToneGenerator/MIDIToneGenerator.c | 39 | ||||
| -rw-r--r-- | Projects/MIDIToneGenerator/MIDIToneGenerator.h | 35 |
2 files changed, 38 insertions, 36 deletions
diff --git a/Projects/MIDIToneGenerator/MIDIToneGenerator.c b/Projects/MIDIToneGenerator/MIDIToneGenerator.c index 851db252b..a068d75e6 100644 --- a/Projects/MIDIToneGenerator/MIDIToneGenerator.c +++ b/Projects/MIDIToneGenerator/MIDIToneGenerator.c @@ -1,7 +1,7 @@ /* LUFA Library Copyright (C) Dean Camera, 2011. - + dean [at] fourwalledcubicle [dot] com www.fourwalledcubicle.com */ @@ -9,13 +9,13 @@ /* Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com) - Permission to use, copy, modify, distribute, and sell this + 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 + 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 + 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 disclaim all warranties with regard to this @@ -90,7 +90,7 @@ int main(void) LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY); sei(); - + for (;;) { MIDI_EventPacket_t ReceivedMIDIEvent; @@ -99,7 +99,7 @@ int main(void) if ((ReceivedMIDIEvent.Command == (MIDI_COMMAND_NOTE_ON >> 4)) && ((ReceivedMIDIEvent.Data1 & 0x0F) == 0)) { DDSNoteData* LRUNoteStruct = &NoteData[0]; - + /* Find a free entry in the note table to use for the note being turned on */ for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++) { @@ -112,13 +112,13 @@ int main(void) } else if (NoteData[i].LRUAge >= LRUNoteStruct->LRUAge) { - /* If an older entry that the current entry has been found, prefer overwriting that one */ + /* If an older entry that the current entry has been found, prefer overwriting that one */ LRUNoteStruct = &NoteData[i]; } - + NoteData[i].LRUAge++; } - + /* Update the oldest note entry with the new note data and reset its age */ LRUNoteStruct->Pitch = ReceivedMIDIEvent.Data2; LRUNoteStruct->TableIncrement = (uint32_t)(BASE_INCREMENT * SCALE_FACTOR) + @@ -133,7 +133,7 @@ int main(void) else if ((ReceivedMIDIEvent.Command == (MIDI_COMMAND_NOTE_OFF >> 4)) && ((ReceivedMIDIEvent.Data1 & 0x0F) == 0)) { bool FoundActiveNote = false; - + /* Find the note in the note table to turn off */ for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++) { @@ -142,13 +142,13 @@ int main(void) else if (NoteData[i].Pitch) FoundActiveNote = true; } - + /* If all notes off, turn off the indicator LED */ if (!(FoundActiveNote)) LEDs_SetAllLEDs(LEDS_NO_LEDS); } } - + MIDI_Device_USBTask(&Keyboard_MIDI_Interface); USB_USBTask(); } @@ -158,7 +158,7 @@ int main(void) ISR(TIMER0_COMPA_vect, ISR_BLOCK) { uint16_t MixedSample = 0; - + /* Sum together all the active notes to form a single sample */ for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++) { @@ -167,13 +167,13 @@ ISR(TIMER0_COMPA_vect, ISR_BLOCK) { /* Use the top 8 bits of the table position as the sample table index */ uint8_t TableIndex = (NoteData[i].TablePosition >> 24); - + /* Add the new tone sample to the accumulator and increment the table position */ MixedSample += SineTable[TableIndex]; NoteData[i].TablePosition += NoteData[i].TableIncrement; } } - + /* Output clamped mixed sample value to the PWM */ OCR3A = (MixedSample <= 0xFF) ? MixedSample : 0xFF; } @@ -187,7 +187,7 @@ void SetupHardware(void) /* Disable clock division */ clock_prescale_set(clock_div_1); - + /* Hardware Initialization */ LEDs_Init(); USB_Init(); @@ -234,7 +234,7 @@ void EVENT_USB_Device_ConfigurationChanged(void) bool ConfigSuccess = true; ConfigSuccess &= MIDI_Device_ConfigureEndpoints(&Keyboard_MIDI_Interface); - + LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR); } @@ -243,3 +243,4 @@ void EVENT_USB_Device_ControlRequest(void) { MIDI_Device_ProcessControlRequest(&Keyboard_MIDI_Interface); } + diff --git a/Projects/MIDIToneGenerator/MIDIToneGenerator.h b/Projects/MIDIToneGenerator/MIDIToneGenerator.h index cf04b9f9a..333938df2 100644 --- a/Projects/MIDIToneGenerator/MIDIToneGenerator.h +++ b/Projects/MIDIToneGenerator/MIDIToneGenerator.h @@ -1,7 +1,7 @@ /* LUFA Library Copyright (C) Dean Camera, 2011. - + dean [at] fourwalledcubicle [dot] com www.fourwalledcubicle.com */ @@ -9,13 +9,13 @@ /* Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com) - Permission to use, copy, modify, distribute, and sell this + 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 + 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 + 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 disclaim all warranties with regard to this @@ -32,7 +32,7 @@ * * Header file for AudioOutput.c. */ - + #ifndef _AUDIO_OUTPUT_H_ #define _AUDIO_OUTPUT_H_ @@ -45,7 +45,7 @@ #include <stdbool.h> #include "Descriptors.h" - + #include <LUFA/Version.h> #include <LUFA/Drivers/Board/LEDs.h> #include <LUFA/Drivers/Peripheral/ADC.h> @@ -63,27 +63,27 @@ /** 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 - + /** Maximum number of MIDI notes that can be played simultaneously */ #define MAX_SIMULTANEOUS_NOTES 3 - + /** 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)) @@ -98,10 +98,11 @@ /* 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 + |