Melody - Example of playing melodies using DAC.

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Edward Baker / Mbed 2 deprecated Melody

Example of playing melodies using DAC.

Dependencies: Joystick mbed

Fork of Melody by Craig Evans

main.cpp@2:7804ced75c2f, 2017-03-02 (annotated)

Committer:: el16ecb
Date:: Thu Mar 02 09:58:27 2017 +0000
Revision:: 2:7804ced75c2f
Parent:: 1:7c149b76c057

Who changed what in which revision?

User	Revision	Line number	New contents of line
eencae	0:f1e3ef53cc3c	1	/* Melody
eencae	0:f1e3ef53cc3c	2
eencae	0:f1e3ef53cc3c	3	Play a simple melody on the DAC using a look-up table for the sine waveform
eencae	0:f1e3ef53cc3c	4	Includes a primitive graphic equalizer on the LEDs
eencae	0:f1e3ef53cc3c	5
eencae	0:f1e3ef53cc3c	6	Craig A. Evans
eencae	0:f1e3ef53cc3c	7
eencae	0:f1e3ef53cc3c	8	March 2014
eencae	0:f1e3ef53cc3c	9
eencae	0:f1e3ef53cc3c	10	*/
eencae	0:f1e3ef53cc3c	11
eencae	0:f1e3ef53cc3c	12	#include "mbed.h"
eencae	0:f1e3ef53cc3c	13	#include "tone.h" // note definitions
el16ecb	1:7c149b76c057	14	#include <Joystick.h>
eencae	0:f1e3ef53cc3c	15
eencae	0:f1e3ef53cc3c	16	#define PI 3.14159265359
eencae	0:f1e3ef53cc3c	17
eencae	0:f1e3ef53cc3c	18	Timer noteTimer; // timer for note duration
eencae	0:f1e3ef53cc3c	19	AnalogOut aout(p18); // DAC on pin 18
eencae	0:f1e3ef53cc3c	20	BusOut leds(LED4,LED3,LED2,LED1); // LEDs for display
el16ecb	1:7c149b76c057	21	Joystick stick = Joystick(p20,p19,p17);
el16ecb	1:7c149b76c057	22	PwmOut red_led (p24);
el16ecb	1:7c149b76c057	23	PwmOut green_led (p23);
el16ecb	1:7c149b76c057	24	PwmOut blue_led (p22);
el16ecb	1:7c149b76c057	25
eencae	0:f1e3ef53cc3c	26
eencae	0:f1e3ef53cc3c	27	void initArray(); // function to initialise sample array
eencae	0:f1e3ef53cc3c	28	void tone(float frequency,float duration); // play a tone of set frequency for given duration
el16ecb	1:7c149b76c057	29	void graphicEqualizer(int frequency); // displays pattern on LEDs depending on the frequency
eencae	0:f1e3ef53cc3c	30
eencae	0:f1e3ef53cc3c	31	int n = 32; // number of samples
eencae	0:f1e3ef53cc3c	32	float y[32]; // array to store samples
eencae	0:f1e3ef53cc3c	33	float BPM = 73.0; // beats per minute
el16ecb	1:7c149b76c057	34	Vector2D coord = stick.get_coord();
el16ecb	1:7c149b76c057	35	float xoffset = 1 - (coord.x/2);
el16ecb	1:7c149b76c057	36	float yoffset = 1 - (coord.y/5);
eencae	0:f1e3ef53cc3c	37
eencae	0:f1e3ef53cc3c	38	// comment one of the blocks out below - need noteArray[] and noteDuration[]
eencae	0:f1e3ef53cc3c	39
eencae	0:f1e3ef53cc3c	40	/*
eencae	0:f1e3ef53cc3c	41	// secret film melody...
eencae	0:f1e3ef53cc3c	42	float noteArray[] = {
eencae	0:f1e3ef53cc3c	43	NOTE_E4,NOTE_F4,NOTE_F4,NOTE_F4,NOTE_F4,NOTE_E4,NOTE_E4,NOTE_E4,
eencae	0:f1e3ef53cc3c	44	NOTE_E4,NOTE_G4,NOTE_G4,NOTE_G4,NOTE_G4,NOTE_E4,NOTE_E4,NOTE_E4,
eencae	0:f1e3ef53cc3c	45	NOTE_E4,NOTE_F4,NOTE_F4,NOTE_F4,NOTE_F4,NOTE_E4,NOTE_E4,NOTE_E4,
eencae	0:f1e3ef53cc3c	46	NOTE_E4,NOTE_G4,NOTE_G4,NOTE_G4,NOTE_G4,NOTE_E4,NOTE_E4,NOTE_E4,
eencae	0:f1e3ef53cc3c	47	NOTE_DS5,NOTE_D5,NOTE_B4,NOTE_A4,NOTE_B4,NOTE_E4,NOTE_G4,NOTE_DS5,
eencae	0:f1e3ef53cc3c	48	NOTE_D5,NOTE_G4,NOTE_B4,NOTE_B4,NOTE_FS5,NOTE_F5,NOTE_B4,NOTE_D5,
eencae	0:f1e3ef53cc3c	49	NOTE_AS5,NOTE_A5,NOTE_F5,NOTE_A5,NOTE_DS6,NOTE_D6
eencae	0:f1e3ef53cc3c	50	};
eencae	0:f1e3ef53cc3c	51
eencae	0:f1e3ef53cc3c	52	// durations of the notes
eencae	0:f1e3ef53cc3c	53	// 1/8th, 1/16th, 1/4th etc.
eencae	0:f1e3ef53cc3c	54	float noteDuration[] = {
eencae	0:f1e3ef53cc3c	55	8,16,16,8,4,8,8,8,
eencae	0:f1e3ef53cc3c	56	8,16,16,8,4,8,8,8,
eencae	0:f1e3ef53cc3c	57	8,16,16,8,4,8,8,8,
eencae	0:f1e3ef53cc3c	58	8,16,16,8,4,8,8,8,
eencae	0:f1e3ef53cc3c	59	8,2,8,8,1,8,4,8,
eencae	0:f1e3ef53cc3c	60	4,8,8,8,8,4,8,4,
eencae	0:f1e3ef53cc3c	61	8,4,8,4,8,3
eencae	0:f1e3ef53cc3c	62	};
eencae	0:f1e3ef53cc3c	63	*/
eencae	0:f1e3ef53cc3c	64
eencae	0:f1e3ef53cc3c	65
eencae	0:f1e3ef53cc3c	66	// secret computer game melody...
eencae	0:f1e3ef53cc3c	67	float noteArray[] = {
el16ecb	1:7c149b76c057	68	//NOTE_E7, NOTE_E7, 0, NOTE_E7,
el16ecb	1:7c149b76c057	69	// 0, NOTE_C7, NOTE_E7, 0,
el16ecb	1:7c149b76c057	70	// NOTE_G7, 0, 0, 0,
el16ecb	1:7c149b76c057	71	// NOTE_G6, 0, 0, 0,
el16ecb	1:7c149b76c057	72	//
el16ecb	1:7c149b76c057	73	// NOTE_C7, 0, 0, NOTE_G6,
el16ecb	1:7c149b76c057	74	// 0, 0, NOTE_E6, 0,
el16ecb	1:7c149b76c057	75	// 0, NOTE_A6, 0, NOTE_B6,
el16ecb	1:7c149b76c057	76	// 0, NOTE_AS6, NOTE_A6, 0,
el16ecb	1:7c149b76c057	77	//
el16ecb	1:7c149b76c057	78	// NOTE_G6, NOTE_E7, NOTE_G7,
el16ecb	1:7c149b76c057	79	// NOTE_A7, 0, NOTE_F7, NOTE_G7,
el16ecb	1:7c149b76c057	80	// 0, NOTE_E7, 0,NOTE_C7,
el16ecb	1:7c149b76c057	81	// NOTE_D7, NOTE_B6, 0, 0,
el16ecb	1:7c149b76c057	82	//
el16ecb	1:7c149b76c057	83	// NOTE_C7, 0, 0, NOTE_G6,
el16ecb	1:7c149b76c057	84	// 0, 0, NOTE_E6, 0,
el16ecb	1:7c149b76c057	85	// 0, NOTE_A6, 0, NOTE_B6,
el16ecb	1:7c149b76c057	86	// 0, NOTE_AS6, NOTE_A6, 0,
el16ecb	1:7c149b76c057	87	//
el16ecb	1:7c149b76c057	88	// NOTE_G6, NOTE_E7, NOTE_G7,
el16ecb	1:7c149b76c057	89	// NOTE_A7, 0, NOTE_F7, NOTE_G7,
el16ecb	1:7c149b76c057	90	// 0, NOTE_E7, 0,NOTE_C7,
el16ecb	1:7c149b76c057	91	// NOTE_D7, NOTE_B6, 0, 0
el16ecb	1:7c149b76c057	92	NOTE_G6, 0, NOTE_A7, 0,
el16ecb	1:7c149b76c057	93	NOTE_E6, NOTE_E6, 0, NOTE_C6,
el16ecb	1:7c149b76c057	94
el16ecb	1:7c149b76c057	95	NOTE_DS6, NOTE_D6, NOTE_C6, 0,
el16ecb	1:7c149b76c057	96	NOTE_C6, 0, NOTE_D6, 0,
eencae	0:f1e3ef53cc3c	97
el16ecb	1:7c149b76c057	98	NOTE_DS6, 0, NOTE_DS6, NOTE_D6,
el16ecb	1:7c149b76c057	99	NOTE_C6, NOTE_D6, NOTE_E6, NOTE_G6,
el16ecb	1:7c149b76c057	100
el16ecb	1:7c149b76c057	101	NOTE_A7, NOTE_E6, NOTE_G7, NOTE_D6,
el16ecb	1:7c149b76c057	102	NOTE_E6, NOTE_C6, NOTE_D6, NOTE_C6,
el16ecb	1:7c149b76c057	103
el16ecb	1:7c149b76c057	104	NOTE_E6, 0, NOTE_G6, 0,
el16ecb	1:7c149b76c057	105	NOTE_A7, NOTE_E6, NOTE_G6, NOTE_D6,
el16ecb	1:7c149b76c057	106
el16ecb	1:7c149b76c057	107	NOTE_E6, NOTE_C6, NOTE_DS6, NOTE_E6,
el16ecb	1:7c149b76c057	108	NOTE_DS6, NOTE_D6, NOTE_C6, NOTE_D6,
el16ecb	1:7c149b76c057	109
el16ecb	1:7c149b76c057	110	NOTE_DS6, 0, NOTE_C6, NOTE_D6,
el16ecb	1:7c149b76c057	111	NOTE_E6, NOTE_G6, NOTE_D6, NOTE_E6,
el16ecb	1:7c149b76c057	112
el16ecb	1:7c149b76c057	113	NOTE_D6, NOTE_C6, NOTE_D6, 0,
el16ecb	1:7c149b76c057	114	NOTE_C6, 0, NOTE_D6, 0,
el16ecb	1:7c149b76c057	115
el16ecb	1:7c149b76c057	116	NOTE_G6, 0, NOTE_A7, 0,
el16ecb	1:7c149b76c057	117	NOTE_E6, NOTE_E6, 0, NOTE_C6,
el16ecb	1:7c149b76c057	118
el16ecb	1:7c149b76c057	119	NOTE_DS6, NOTE_D6, NOTE_C6, 0,
el16ecb	1:7c149b76c057	120	NOTE_C6, 0, NOTE_D6, 0,
el16ecb	1:7c149b76c057	121
el16ecb	1:7c149b76c057	122	NOTE_DS6, 0, NOTE_DS6, NOTE_D6,
el16ecb	1:7c149b76c057	123	NOTE_C6, NOTE_D6, NOTE_E6, NOTE_G6,
el16ecb	1:7c149b76c057	124
el16ecb	1:7c149b76c057	125	NOTE_A7, NOTE_E6, NOTE_G7, NOTE_D6,
el16ecb	1:7c149b76c057	126	NOTE_E6, NOTE_C6, NOTE_D6, NOTE_C6,
eencae	0:f1e3ef53cc3c	127
el16ecb	1:7c149b76c057	128	NOTE_E6, 0, NOTE_G6, 0,
el16ecb	1:7c149b76c057	129	NOTE_A7, NOTE_E6, NOTE_G6, NOTE_D6,
el16ecb	1:7c149b76c057	130
el16ecb	1:7c149b76c057	131	NOTE_E6, NOTE_C6, NOTE_DS6, NOTE_E6,
el16ecb	1:7c149b76c057	132	NOTE_DS6, NOTE_D6, NOTE_C6, NOTE_D6,
el16ecb	1:7c149b76c057	133
el16ecb	1:7c149b76c057	134	NOTE_DS6, 0, NOTE_C6, NOTE_D6,
el16ecb	1:7c149b76c057	135	NOTE_E6, NOTE_G6, NOTE_D6, NOTE_E6,
el16ecb	1:7c149b76c057	136
el16ecb	1:7c149b76c057	137	NOTE_D6, NOTE_C6, NOTE_D6, 0,
el16ecb	1:7c149b76c057	138	NOTE_C6, 0, NOTE_C6, 0,
el16ecb	1:7c149b76c057	139
el16ecb	1:7c149b76c057	140	NOTE_C6, 0, NOTE_G5, NOTE_A6,
el16ecb	1:7c149b76c057	141	NOTE_C6, 0, NOTE_G5, NOTE_A6,
el16ecb	1:7c149b76c057	142
el16ecb	1:7c149b76c057	143	NOTE_C6, NOTE_D6, NOTE_E6, NOTE_C6,
el16ecb	1:7c149b76c057	144	NOTE_F6, NOTE_E6, NOTE_F6, NOTE_G6,
el16ecb	1:7c149b76c057	145
el16ecb	1:7c149b76c057	146	NOTE_C6, 0, NOTE_C6, 0,
el16ecb	1:7c149b76c057	147	NOTE_G5, NOTE_A6, NOTE_C6, NOTE_G6,
el16ecb	1:7c149b76c057	148
el16ecb	1:7c149b76c057	149	NOTE_F6, NOTE_E6, NOTE_D6, NOTE_C6,
el16ecb	1:7c149b76c057	150	NOTE_F5, NOTE_E5, NOTE_F5, NOTE_G5,
el16ecb	1:7c149b76c057	151
el16ecb	1:7c149b76c057	152	NOTE_C6, 0, NOTE_G5, NOTE_A6,
el16ecb	1:7c149b76c057	153	NOTE_C6, 0, NOTE_G5, NOTE_A6,
el16ecb	1:7c149b76c057	154
el16ecb	1:7c149b76c057	155	NOTE_C6, NOTE_C6, NOTE_D6, NOTE_E6,
el16ecb	1:7c149b76c057	156	NOTE_C6, NOTE_G5, NOTE_A6, NOTE_G5,
eencae	0:f1e3ef53cc3c	157
el16ecb	1:7c149b76c057	158	NOTE_C6, 0, NOTE_C6, NOTE_B6,
el16ecb	1:7c149b76c057	159	NOTE_C5, NOTE_G5, NOTE_A6, NOTE_C6,
el16ecb	1:7c149b76c057	160
el16ecb	1:7c149b76c057	161	NOTE_F6, NOTE_E6, NOTE_F6, NOTE_G6,
el16ecb	1:7c149b76c057	162	NOTE_C6, 0, NOTE_B6, 0,
el16ecb	1:7c149b76c057	163
el16ecb	1:7c149b76c057	164	NOTE_C6, 0, NOTE_G5, NOTE_A6,
el16ecb	1:7c149b76c057	165	NOTE_C6, 0, NOTE_G5, NOTE_A6,
el16ecb	1:7c149b76c057	166
el16ecb	1:7c149b76c057	167	NOTE_C6, NOTE_D6, NOTE_E6, NOTE_C6,
el16ecb	1:7c149b76c057	168	NOTE_F6, NOTE_E6, NOTE_F6, NOTE_G6,
el16ecb	1:7c149b76c057	169
el16ecb	1:7c149b76c057	170	NOTE_C6, 0, NOTE_C6, 0,
el16ecb	1:7c149b76c057	171	NOTE_G5, NOTE_A6, NOTE_C6, NOTE_G6,
eencae	0:f1e3ef53cc3c	172
el16ecb	1:7c149b76c057	173	NOTE_F6, NOTE_E6, NOTE_D6, NOTE_C6,
el16ecb	1:7c149b76c057	174	NOTE_F5, NOTE_E5, NOTE_F5, NOTE_G5,
el16ecb	1:7c149b76c057	175
el16ecb	1:7c149b76c057	176	NOTE_C6, 0, NOTE_G5, NOTE_A6,
el16ecb	1:7c149b76c057	177	NOTE_C6, 0, NOTE_G5, NOTE_A6,
el16ecb	1:7c149b76c057	178
el16ecb	1:7c149b76c057	179	NOTE_C6, NOTE_C6, NOTE_D6, NOTE_E6,
el16ecb	1:7c149b76c057	180	NOTE_C6, NOTE_G5, NOTE_A6, NOTE_G5,
el16ecb	1:7c149b76c057	181
el16ecb	1:7c149b76c057	182	NOTE_C6, 0, NOTE_C6, NOTE_B6,
el16ecb	1:7c149b76c057	183	NOTE_C5, NOTE_G5, NOTE_A6, NOTE_C6,
el16ecb	1:7c149b76c057	184
el16ecb	1:7c149b76c057	185	NOTE_F6, NOTE_E6, NOTE_F6, NOTE_G6,
el16ecb	1:7c149b76c057	186	NOTE_C6, 0, NOTE_D6, 0,
eencae	0:f1e3ef53cc3c	187	};
eencae	0:f1e3ef53cc3c	188
eencae	0:f1e3ef53cc3c	189	// durations of the notes
eencae	0:f1e3ef53cc3c	190	// 1/8th, 1/16th, 1/4th etc.
eencae	0:f1e3ef53cc3c	191	float noteDuration[] = {
el16ecb	1:7c149b76c057	192	18, 18, 18, 18,
el16ecb	1:7c149b76c057	193	18, 18, 18, 18,
el16ecb	1:7c149b76c057	194	18, 18, 18, 18,
el16ecb	1:7c149b76c057	195	18, 18, 18, 18,
el16ecb	1:7c149b76c057	196
el16ecb	1:7c149b76c057	197	18, 18, 18, 18,
el16ecb	1:7c149b76c057	198	18, 18, 18, 18,
el16ecb	1:7c149b76c057	199	18, 18, 18, 18,
el16ecb	1:7c149b76c057	200	18, 18, 18, 18,
el16ecb	1:7c149b76c057	201
el16ecb	1:7c149b76c057	202	18, 18, 18, 18,
el16ecb	1:7c149b76c057	203	18, 18, 18, 18,
el16ecb	1:7c149b76c057	204	18, 18, 18, 18,
el16ecb	1:7c149b76c057	205	18, 18, 18, 18,
el16ecb	1:7c149b76c057	206
el16ecb	1:7c149b76c057	207	18, 18, 18, 18,
el16ecb	1:7c149b76c057	208	18, 18, 18, 18,
el16ecb	1:7c149b76c057	209	18, 18, 18, 18,
el16ecb	1:7c149b76c057	210	18, 18, 18, 18,
eencae	0:f1e3ef53cc3c	211
el16ecb	1:7c149b76c057	212	18, 18, 18, 18,
el16ecb	1:7c149b76c057	213	18, 18, 18, 18,
el16ecb	1:7c149b76c057	214	18, 18, 18, 18,
el16ecb	1:7c149b76c057	215	18, 18, 18, 18,
el16ecb	1:7c149b76c057	216
el16ecb	1:7c149b76c057	217	18, 18, 18, 18,
el16ecb	1:7c149b76c057	218	18, 18, 18, 18,
el16ecb	1:7c149b76c057	219	18, 18, 18, 18,
el16ecb	1:7c149b76c057	220	18, 18, 18, 18,
el16ecb	1:7c149b76c057	221
el16ecb	1:7c149b76c057	222	18, 18, 18, 18,
el16ecb	1:7c149b76c057	223	18, 18, 18, 18,
el16ecb	1:7c149b76c057	224	18, 18, 18, 18,
el16ecb	1:7c149b76c057	225	18, 18, 18, 18,
el16ecb	1:7c149b76c057	226
el16ecb	1:7c149b76c057	227	18, 18, 18, 18,
el16ecb	1:7c149b76c057	228	18, 18, 18, 18,
el16ecb	1:7c149b76c057	229	18, 18, 18, 18,
el16ecb	1:7c149b76c057	230	18, 18, 18, 18,
el16ecb	1:7c149b76c057	231
el16ecb	1:7c149b76c057	232	18, 18, 18, 18,
el16ecb	1:7c149b76c057	233	18, 18, 18, 18,
el16ecb	1:7c149b76c057	234	18, 18, 18, 18,
el16ecb	1:7c149b76c057	235	18, 18, 18, 18,
eencae	0:f1e3ef53cc3c	236
el16ecb	1:7c149b76c057	237	18, 18, 18, 18,
el16ecb	1:7c149b76c057	238	18, 18, 18, 18,
el16ecb	1:7c149b76c057	239	18, 18, 18, 18,
el16ecb	1:7c149b76c057	240	18, 18, 18, 18,
el16ecb	1:7c149b76c057	241
el16ecb	1:7c149b76c057	242	18, 18, 18, 18,
el16ecb	1:7c149b76c057	243	18, 18, 18, 18,
el16ecb	1:7c149b76c057	244	18, 18, 18, 18,
el16ecb	1:7c149b76c057	245	18, 18, 18, 18,
el16ecb	1:7c149b76c057	246
el16ecb	1:7c149b76c057	247	18, 18, 18, 18,
el16ecb	1:7c149b76c057	248	18, 18, 18, 18,
el16ecb	1:7c149b76c057	249	18, 18, 18, 18,
el16ecb	1:7c149b76c057	250	18, 18, 18, 18,
el16ecb	1:7c149b76c057	251
el16ecb	1:7c149b76c057	252	18, 18, 18, 18,
el16ecb	1:7c149b76c057	253	18, 18, 18, 18,
el16ecb	1:7c149b76c057	254	18, 18, 18, 18,
el16ecb	1:7c149b76c057	255	18, 18, 18, 18,
eencae	0:f1e3ef53cc3c	256
el16ecb	1:7c149b76c057	257	18, 18, 18, 18,
el16ecb	1:7c149b76c057	258	18, 18, 18, 18,
el16ecb	1:7c149b76c057	259	18, 18, 18, 18,
el16ecb	1:7c149b76c057	260	18, 18, 18, 18,
el16ecb	1:7c149b76c057	261
el16ecb	1:7c149b76c057	262	18, 18, 18, 18,
el16ecb	1:7c149b76c057	263	18, 18, 18, 18,
el16ecb	1:7c149b76c057	264	18, 18, 18, 18,
el16ecb	1:7c149b76c057	265	18, 18, 18, 18,
eencae	0:f1e3ef53cc3c	266
el16ecb	1:7c149b76c057	267	18, 18, 18, 18,
el16ecb	1:7c149b76c057	268	18, 18, 18, 18,
el16ecb	1:7c149b76c057	269	18, 18, 18, 18,
el16ecb	1:7c149b76c057	270	18, 18, 18, 18,
el16ecb	1:7c149b76c057	271
el16ecb	1:7c149b76c057	272	18, 18, 18, 18,
el16ecb	1:7c149b76c057	273	18, 18, 18, 18,
el16ecb	1:7c149b76c057	274	18, 18, 18, 18,
el16ecb	1:7c149b76c057	275	18, 18, 18, 18,
el16ecb	1:7c149b76c057	276
el16ecb	1:7c149b76c057	277	18, 18, 18, 18,
el16ecb	1:7c149b76c057	278	18, 18, 18, 18,
el16ecb	1:7c149b76c057	279	18, 18, 18, 18,
el16ecb	1:7c149b76c057	280	18, 18, 18, 18,
eencae	0:f1e3ef53cc3c	281
eencae	0:f1e3ef53cc3c	282	};
eencae	0:f1e3ef53cc3c	283
eencae	0:f1e3ef53cc3c	284
eencae	0:f1e3ef53cc3c	285	int main()
eencae	0:f1e3ef53cc3c	286	{
eencae	0:f1e3ef53cc3c	287	initArray(); // fill array with sine samples
eencae	0:f1e3ef53cc3c	288
eencae	0:f1e3ef53cc3c	289	// calculate number of notes in array
eencae	0:f1e3ef53cc3c	290	//sizeof() returns number of BYTES in array,
eencae	0:f1e3ef53cc3c	291	// so divide by size of a float in BYTES to get number of elements
eencae	0:f1e3ef53cc3c	292	int notes = sizeof(noteArray)/sizeof(float);
eencae	0:f1e3ef53cc3c	293
eencae	0:f1e3ef53cc3c	294	while (1) {
eencae	0:f1e3ef53cc3c	295
eencae	0:f1e3ef53cc3c	296	// loop through notes
eencae	0:f1e3ef53cc3c	297	for(int i=0; i < notes; i++) {
el16ecb	1:7c149b76c057	298	Vector2D coord = stick.get_coord();
el16ecb	1:7c149b76c057	299	int modi = (yoffset + coord.y/5)*noteArray[i];
el16ecb	1:7c149b76c057	300	float modt = (xoffset + coord.x/2)*noteDuration[i];
el16ecb	1:7c149b76c057	301	printf("%d %d \n",modi,i);
eencae	0:f1e3ef53cc3c	302	// play note
el16ecb	1:7c149b76c057	303	tone(modi,60.0/(BPM*modt));
eencae	0:f1e3ef53cc3c	304	// leave a short pause between notes
el16ecb	1:7c149b76c057	305	wait(60.0/(BPM*modt));
eencae	0:f1e3ef53cc3c	306	}
eencae	0:f1e3ef53cc3c	307
eencae	0:f1e3ef53cc3c	308	wait(1.0); // wait a second before repeating
eencae	0:f1e3ef53cc3c	309
eencae	0:f1e3ef53cc3c	310	}
eencae	0:f1e3ef53cc3c	311
eencae	0:f1e3ef53cc3c	312	}
eencae	0:f1e3ef53cc3c	313
eencae	0:f1e3ef53cc3c	314	void initArray()
eencae	0:f1e3ef53cc3c	315	{
eencae	0:f1e3ef53cc3c	316	// create LUT - loop through array and calculate sine wave samples
eencae	0:f1e3ef53cc3c	317	for (int i = 0; i < n ; i++) {
eencae	0:f1e3ef53cc3c	318	y[i] = 0.5 + 0.5sin(i2*PI/n);
eencae	0:f1e3ef53cc3c	319	}
eencae	0:f1e3ef53cc3c	320
eencae	0:f1e3ef53cc3c	321	}
eencae	0:f1e3ef53cc3c	322
eencae	0:f1e3ef53cc3c	323	void tone(float frequency,float duration)
eencae	0:f1e3ef53cc3c	324	{
el16ecb	1:7c149b76c057	325	int newfreq = int(frequency);
el16ecb	1:7c149b76c057	326	graphicEqualizer(newfreq); // equalizer on LEDs
eencae	0:f1e3ef53cc3c	327
eencae	0:f1e3ef53cc3c	328	if (frequency > 0) { // a frequency of 0 indicates no note played so only play a note if frequency is not 0
eencae	0:f1e3ef53cc3c	329
eencae	0:f1e3ef53cc3c	330	float dt = 1.0/(frequency*n) - (1.34e-6 + 1e-6); // calculate time step - take into account DAC time and wait() offset
eencae	0:f1e3ef53cc3c	331
eencae	0:f1e3ef53cc3c	332	noteTimer.start(); // start timer
eencae	0:f1e3ef53cc3c	333
eencae	0:f1e3ef53cc3c	334	while(noteTimer.read() < duration) { // keep looping while timer less than duration
eencae	0:f1e3ef53cc3c	335
eencae	0:f1e3ef53cc3c	336	for (int i = 0; i < n ; i++) { // loop through samples and output analog waveform
eencae	0:f1e3ef53cc3c	337	aout = y[i];
eencae	0:f1e3ef53cc3c	338	wait(dt); // leave appropriate delay for frequency
eencae	0:f1e3ef53cc3c	339	}
eencae	0:f1e3ef53cc3c	340	}
eencae	0:f1e3ef53cc3c	341
eencae	0:f1e3ef53cc3c	342	noteTimer.stop(); // stop the timer
eencae	0:f1e3ef53cc3c	343	noteTimer.reset(); // reset to 0
eencae	0:f1e3ef53cc3c	344
eencae	0:f1e3ef53cc3c	345	} else { // if no note played, have a simple delay
eencae	0:f1e3ef53cc3c	346	wait(duration);
eencae	0:f1e3ef53cc3c	347	}
eencae	0:f1e3ef53cc3c	348
eencae	0:f1e3ef53cc3c	349	leds = 0; // turn off LEDs
eencae	0:f1e3ef53cc3c	350	}
eencae	0:f1e3ef53cc3c	351
eencae	0:f1e3ef53cc3c	352	// primitive graphic equalizer on the LEDs
el16ecb	1:7c149b76c057	353	void graphicEqualizer(int frequency)
eencae	0:f1e3ef53cc3c	354	{
eencae	0:f1e3ef53cc3c	355	// these numbers are fairly random and picked to give a
eencae	0:f1e3ef53cc3c	356	// decent effect when the melodies plays.
el16ecb	1:7c149b76c057	357	// Will have to change for different melodies
el16ecb	1:7c149b76c057	358	//printf("%f",float((frequency%63)/63.0));
el16ecb	1:7c149b76c057	359	red_led = ((frequency%31)/31.0);
el16ecb	1:7c149b76c057	360	green_led = (((frequency)%37)/37.0);
el16ecb	1:7c149b76c057	361	blue_led = (((frequency)%41)/41.0);
eencae	0:f1e3ef53cc3c	362
eencae	0:f1e3ef53cc3c	363	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	02 Mar 2017
Imports:	5
Forks:	0
Commits:	3
Dependents:	0
Dependencies:	2
Followers:	1

main.cpp@2:7804ced75c2f, 2017-03-02 (annotated)

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