MIDI_Synthesizer - This is a MIDI synthesizer with touchpads used fo…

Users » thejasvi3 » Code » MIDI_Synthesizer

Thejasvi Magudilu Vijayaraj / Mbed 2 deprecated MIDI_Synthesizer

This is a MIDI synthesizer with touchpads used for playing the notes. mbed will capture the touchpad press and release events and sends the appropriate MIDI commands to the PC. By using the C# windows forms application created by us, one can compose songs as though they were composed on a piano. We support all types of standard MIDI piano types.

Dependencies: mbed

main.cpp@0:e33f18af0471, 2011-10-13 (annotated)

Committer:: thejasvi3
Date:: Thu Oct 13 06:17:30 2011 +0000
Revision:: 0:e33f18af0471

Who changed what in which revision?

User	Revision	Line number	New contents of line
thejasvi3	0:e33f18af0471	1	#include <mbed.h>
thejasvi3	0:e33f18af0471	2	#include <string>
thejasvi3	0:e33f18af0471	3	#include <list>
thejasvi3	0:e33f18af0471	4
thejasvi3	0:e33f18af0471	5	#include <mpr121.h>
thejasvi3	0:e33f18af0471	6	#include "NokiaLCD.h"
thejasvi3	0:e33f18af0471	7
thejasvi3	0:e33f18af0471	8
thejasvi3	0:e33f18af0471	9	DigitalOut led1(LED1);
thejasvi3	0:e33f18af0471	10	DigitalOut led2(LED2);
thejasvi3	0:e33f18af0471	11	DigitalOut led3(LED3);
thejasvi3	0:e33f18af0471	12	DigitalOut led4(LED4);
thejasvi3	0:e33f18af0471	13
thejasvi3	0:e33f18af0471	14	// Pushbuttons to change the octaves of the touchpads
thejasvi3	0:e33f18af0471	15	InterruptIn octavePlus1(p18); // Pushbutton that increments the octave of touchpad1
thejasvi3	0:e33f18af0471	16	InterruptIn octaveMinus1(p17); // Pushbutton that decrements the octave of touchpad1
thejasvi3	0:e33f18af0471	17	InterruptIn octavePlus2(p16); // Pushbutton that increments the octave of touchpad2
thejasvi3	0:e33f18af0471	18	InterruptIn octaveMinus2(p15); // Pushbutton that decrements the octave of touchpad2
thejasvi3	0:e33f18af0471	19
thejasvi3	0:e33f18af0471	20	// Create the interrupt receiver object on pin 26
thejasvi3	0:e33f18af0471	21	InterruptIn interrupt1(p26); // IRQ of touchpad1
thejasvi3	0:e33f18af0471	22	InterruptIn interrupt2(p8); // IRQ of touchpad2
thejasvi3	0:e33f18af0471	23
thejasvi3	0:e33f18af0471	24	// Setup the Serial to the PC for debugging
thejasvi3	0:e33f18af0471	25	Serial pc(USBTX, USBRX);
thejasvi3	0:e33f18af0471	26
thejasvi3	0:e33f18af0471	27	// Setup the i2c bus on pins 28 and 27
thejasvi3	0:e33f18af0471	28	I2C i2c1(p28, p27);
thejasvi3	0:e33f18af0471	29	I2C i2c2(p9,p10);
thejasvi3	0:e33f18af0471	30
thejasvi3	0:e33f18af0471	31
thejasvi3	0:e33f18af0471	32	//Setup NOKIA LCD
thejasvi3	0:e33f18af0471	33	NokiaLCD lcd(p5, p7, p12, p11, NokiaLCD::LCD6610); // mosi, sclk, cs, rst, type
thejasvi3	0:e33f18af0471	34
thejasvi3	0:e33f18af0471	35
thejasvi3	0:e33f18af0471	36	// Setup the Mpr121:
thejasvi3	0:e33f18af0471	37	// constructor(i2c object, i2c address of the mpr121)
thejasvi3	0:e33f18af0471	38	Mpr121 mpr121_1(&i2c1, Mpr121::ADD_VSS);
thejasvi3	0:e33f18af0471	39	Mpr121 mpr121_2(&i2c2, Mpr121::ADD_VSS);
thejasvi3	0:e33f18af0471	40
thejasvi3	0:e33f18af0471	41	Timer t1; // to calulate delta time
thejasvi3	0:e33f18af0471	42
thejasvi3	0:e33f18af0471	43	void midiEventGenerator1();
thejasvi3	0:e33f18af0471	44	void midiEventGenerator2();
thejasvi3	0:e33f18af0471	45
thejasvi3	0:e33f18af0471	46
thejasvi3	0:e33f18af0471	47	volatile char octave[2] = {0,1}; // Stores the current octave of both the touchpads
thejasvi3	0:e33f18af0471	48	volatile int prev_val[2] = {0,0}; // Stores the previous touchpad values
thejasvi3	0:e33f18af0471	49	volatile int cur_val[2] = {0,0}; // Stores the current touchpad values
thejasvi3	0:e33f18af0471	50	volatile int time_us = 0; // Stores the time between different events of the same touchpad
thejasvi3	0:e33f18af0471	51
thejasvi3	0:e33f18af0471	52
thejasvi3	0:e33f18af0471	53	const int backgroundColor = 0x0000FF;
thejasvi3	0:e33f18af0471	54	const int graphBarColor = 0xFFFFFF;
thejasvi3	0:e33f18af0471	55	const int graphAxesColor = 0xFFFFFF;
thejasvi3	0:e33f18af0471	56
thejasvi3	0:e33f18af0471	57	int t = 0;
thejasvi3	0:e33f18af0471	58
thejasvi3	0:e33f18af0471	59	// Key hit/release interrupt routine for touch pad 1
thejasvi3	0:e33f18af0471	60	void fallInterrupt1()
thejasvi3	0:e33f18af0471	61	{
thejasvi3	0:e33f18af0471	62	time_us = t1.read_us();
thejasvi3	0:e33f18af0471	63	t1.stop();
thejasvi3	0:e33f18af0471	64	t1.reset();
thejasvi3	0:e33f18af0471	65	t1.start();
thejasvi3	0:e33f18af0471	66	cur_val[0] = mpr121_1.read(0x00);
thejasvi3	0:e33f18af0471	67	cur_val[0] += mpr121_1.read(0x01)<<8;
thejasvi3	0:e33f18af0471	68
thejasvi3	0:e33f18af0471	69	midiEventGenerator1();
thejasvi3	0:e33f18af0471	70	}
thejasvi3	0:e33f18af0471	71
thejasvi3	0:e33f18af0471	72
thejasvi3	0:e33f18af0471	73	// Key hit/release interrupt routine for touch pad 2
thejasvi3	0:e33f18af0471	74	void fallInterrupt2()
thejasvi3	0:e33f18af0471	75	{
thejasvi3	0:e33f18af0471	76	time_us = t1.read_us();
thejasvi3	0:e33f18af0471	77	t1.stop();
thejasvi3	0:e33f18af0471	78	t1.reset();
thejasvi3	0:e33f18af0471	79	t1.start();
thejasvi3	0:e33f18af0471	80	cur_val[1] = mpr121_2.read(0x00);
thejasvi3	0:e33f18af0471	81	cur_val[1] += mpr121_2.read(0x01)<<8;
thejasvi3	0:e33f18af0471	82
thejasvi3	0:e33f18af0471	83	midiEventGenerator2();
thejasvi3	0:e33f18af0471	84	}
thejasvi3	0:e33f18af0471	85
thejasvi3	0:e33f18af0471	86	void octaveIncrement1()
thejasvi3	0:e33f18af0471	87	{
thejasvi3	0:e33f18af0471	88	if(octave[0] < 9)
thejasvi3	0:e33f18af0471	89	octave[0]++;
thejasvi3	0:e33f18af0471	90
thejasvi3	0:e33f18af0471	91	// Update the octave number on the LCD
thejasvi3	0:e33f18af0471	92	lcd.fill(48,8,8,8,backgroundColor);
thejasvi3	0:e33f18af0471	93	lcd.locate(6,1);
thejasvi3	0:e33f18af0471	94	lcd.printf("%d",octave[0]);
thejasvi3	0:e33f18af0471	95
thejasvi3	0:e33f18af0471	96	wait(0.5);
thejasvi3	0:e33f18af0471	97	}
thejasvi3	0:e33f18af0471	98
thejasvi3	0:e33f18af0471	99	void octaveIncrement2()
thejasvi3	0:e33f18af0471	100	{
thejasvi3	0:e33f18af0471	101	if(octave[1] < 9)
thejasvi3	0:e33f18af0471	102	octave[1]++;
thejasvi3	0:e33f18af0471	103
thejasvi3	0:e33f18af0471	104	lcd.fill(112,8,8,8,backgroundColor);
thejasvi3	0:e33f18af0471	105	lcd.locate(14,1);
thejasvi3	0:e33f18af0471	106	lcd.printf("%d",octave[1]);
thejasvi3	0:e33f18af0471	107
thejasvi3	0:e33f18af0471	108	wait(0.5);
thejasvi3	0:e33f18af0471	109	}
thejasvi3	0:e33f18af0471	110
thejasvi3	0:e33f18af0471	111	void octaveDecrement1()
thejasvi3	0:e33f18af0471	112	{
thejasvi3	0:e33f18af0471	113	if(octave[0] > 0)
thejasvi3	0:e33f18af0471	114	octave[0]--;
thejasvi3	0:e33f18af0471	115
thejasvi3	0:e33f18af0471	116	lcd.fill(48,8,8,8,backgroundColor);
thejasvi3	0:e33f18af0471	117	lcd.locate(6,1);
thejasvi3	0:e33f18af0471	118	lcd.printf("%d",octave[0]);
thejasvi3	0:e33f18af0471	119
thejasvi3	0:e33f18af0471	120	wait(0.5);
thejasvi3	0:e33f18af0471	121	}
thejasvi3	0:e33f18af0471	122
thejasvi3	0:e33f18af0471	123	void octaveDecrement2()
thejasvi3	0:e33f18af0471	124	{
thejasvi3	0:e33f18af0471	125	if(octave[1] > 0)
thejasvi3	0:e33f18af0471	126	octave[1]--;
thejasvi3	0:e33f18af0471	127
thejasvi3	0:e33f18af0471	128	lcd.fill(112,8,8,8,backgroundColor);
thejasvi3	0:e33f18af0471	129	lcd.locate(14,1);
thejasvi3	0:e33f18af0471	130	lcd.printf("%d",octave[1]);
thejasvi3	0:e33f18af0471	131
thejasvi3	0:e33f18af0471	132	wait(0.5);
thejasvi3	0:e33f18af0471	133	}
thejasvi3	0:e33f18af0471	134
thejasvi3	0:e33f18af0471	135	void rx()
thejasvi3	0:e33f18af0471	136	{
thejasvi3	0:e33f18af0471	137	// reset timer when new file is to be created
thejasvi3	0:e33f18af0471	138	t1.stop();
thejasvi3	0:e33f18af0471	139	t1.reset();
thejasvi3	0:e33f18af0471	140	t1.start();
thejasvi3	0:e33f18af0471	141
thejasvi3	0:e33f18af0471	142	char temp = pc.getc();
thejasvi3	0:e33f18af0471	143	}
thejasvi3	0:e33f18af0471	144
thejasvi3	0:e33f18af0471	145	int main()
thejasvi3	0:e33f18af0471	146	{
thejasvi3	0:e33f18af0471	147	// Initialize LCD
thejasvi3	0:e33f18af0471	148	lcd.background(backgroundColor);
thejasvi3	0:e33f18af0471	149	lcd.cls();
thejasvi3	0:e33f18af0471	150
thejasvi3	0:e33f18af0471	151	lcd.fill(5,35,55,1,graphAxesColor);
thejasvi3	0:e33f18af0471	152	lcd.fill(5,35,1,85,graphAxesColor);
thejasvi3	0:e33f18af0471	153
thejasvi3	0:e33f18af0471	154	lcd.fill(65,35,55,1,graphAxesColor);
thejasvi3	0:e33f18af0471	155	lcd.fill(65,35,1,85,graphAxesColor);
thejasvi3	0:e33f18af0471	156
thejasvi3	0:e33f18af0471	157	lcd.locate(0,1);
thejasvi3	0:e33f18af0471	158	lcd.printf("Octv: %d",octave[0]);
thejasvi3	0:e33f18af0471	159
thejasvi3	0:e33f18af0471	160	lcd.locate(8,1);
thejasvi3	0:e33f18af0471	161	lcd.printf("Octv: %d",octave[1]);
thejasvi3	0:e33f18af0471	162
thejasvi3	0:e33f18af0471	163	// Initialize the pushbutton interrupts
thejasvi3	0:e33f18af0471	164	octavePlus1.mode(PullUp);
thejasvi3	0:e33f18af0471	165	octavePlus1.fall(&octaveIncrement1);
thejasvi3	0:e33f18af0471	166	octavePlus2.mode(PullUp);
thejasvi3	0:e33f18af0471	167	octavePlus2.fall(&octaveIncrement2);
thejasvi3	0:e33f18af0471	168	octaveMinus1.mode(PullUp);
thejasvi3	0:e33f18af0471	169	octaveMinus1.fall(&octaveDecrement1);
thejasvi3	0:e33f18af0471	170	octaveMinus2.mode(PullUp);
thejasvi3	0:e33f18af0471	171	octaveMinus2.fall(&octaveDecrement2);
thejasvi3	0:e33f18af0471	172
thejasvi3	0:e33f18af0471	173
thejasvi3	0:e33f18af0471	174	// for touch pad 1
thejasvi3	0:e33f18af0471	175	interrupt1.mode(PullUp);
thejasvi3	0:e33f18af0471	176	interrupt1.fall(&fallInterrupt1);
thejasvi3	0:e33f18af0471	177	t1.reset();
thejasvi3	0:e33f18af0471	178	t1.start();
thejasvi3	0:e33f18af0471	179
thejasvi3	0:e33f18af0471	180
thejasvi3	0:e33f18af0471	181	// for touch pad 2
thejasvi3	0:e33f18af0471	182	interrupt2.mode(PullUp);
thejasvi3	0:e33f18af0471	183	interrupt2.fall(&fallInterrupt2);
thejasvi3	0:e33f18af0471	184
thejasvi3	0:e33f18af0471	185	// Setup interrupt for serial port rx. This is used to reset the deltatime timer when a new file is created on the PC
thejasvi3	0:e33f18af0471	186	pc.attach(&rx);
thejasvi3	0:e33f18af0471	187
thejasvi3	0:e33f18af0471	188	int temp = 0;
thejasvi3	0:e33f18af0471	189	while (1)
thejasvi3	0:e33f18af0471	190	{
thejasvi3	0:e33f18af0471	191	temp ^= 1;
thejasvi3	0:e33f18af0471	192	led1 = temp;;
thejasvi3	0:e33f18af0471	193	wait(0.5);
thejasvi3	0:e33f18af0471	194	}
thejasvi3	0:e33f18af0471	195	}
thejasvi3	0:e33f18af0471	196
thejasvi3	0:e33f18af0471	197
thejasvi3	0:e33f18af0471	198	void midiEventGenerator1()
thejasvi3	0:e33f18af0471	199	{
thejasvi3	0:e33f18af0471	200	int temp;
thejasvi3	0:e33f18af0471	201
thejasvi3	0:e33f18af0471	202	// Evaluate for touch pad 1
thejasvi3	0:e33f18af0471	203	temp = cur_val[0] ^ prev_val[0];
thejasvi3	0:e33f18af0471	204
thejasvi3	0:e33f18af0471	205	for(int i = 0; i < 12; i++)
thejasvi3	0:e33f18af0471	206	{
thejasvi3	0:e33f18af0471	207	if((temp & 1) == 1)
thejasvi3	0:e33f18af0471	208	{
thejasvi3	0:e33f18af0471	209	int mask = (1 << i);
thejasvi3	0:e33f18af0471	210
thejasvi3	0:e33f18af0471	211	if((cur_val[0] & mask) == mask)
thejasvi3	0:e33f18af0471	212	{
thejasvi3	0:e33f18af0471	213	pc.printf("on%01d%03d%010d",0,((octave[0] * 12) + i), time_us); // sending format: channel, note, deltaTime_uS
thejasvi3	0:e33f18af0471	214	lcd.fill(6,(36 + (7 * i)),50,6,graphBarColor); // Display the FFT
thejasvi3	0:e33f18af0471	215	}
thejasvi3	0:e33f18af0471	216	else
thejasvi3	0:e33f18af0471	217	{
thejasvi3	0:e33f18af0471	218	pc.printf("of%01d%03d%010d",0,((octave[0] * 12) + i), time_us);
thejasvi3	0:e33f18af0471	219	lcd.fill(6,(36 + (7 * i)),50,6,backgroundColor);
thejasvi3	0:e33f18af0471	220	}
thejasvi3	0:e33f18af0471	221	}
thejasvi3	0:e33f18af0471	222	temp = temp >> 1;
thejasvi3	0:e33f18af0471	223	}
thejasvi3	0:e33f18af0471	224
thejasvi3	0:e33f18af0471	225	prev_val[0] = cur_val[0];
thejasvi3	0:e33f18af0471	226
thejasvi3	0:e33f18af0471	227	}
thejasvi3	0:e33f18af0471	228
thejasvi3	0:e33f18af0471	229	void midiEventGenerator2()
thejasvi3	0:e33f18af0471	230	{
thejasvi3	0:e33f18af0471	231	int temp;
thejasvi3	0:e33f18af0471	232
thejasvi3	0:e33f18af0471	233	// Evaluate for touch pad 2
thejasvi3	0:e33f18af0471	234	temp = cur_val[1] ^ prev_val[1];
thejasvi3	0:e33f18af0471	235
thejasvi3	0:e33f18af0471	236	for(int i = 0; i < 12; i++)
thejasvi3	0:e33f18af0471	237	{
thejasvi3	0:e33f18af0471	238	if((temp & 1) == 1)
thejasvi3	0:e33f18af0471	239	{
thejasvi3	0:e33f18af0471	240	int mask = (1 << i);
thejasvi3	0:e33f18af0471	241
thejasvi3	0:e33f18af0471	242	if((cur_val[1] & mask) == mask)
thejasvi3	0:e33f18af0471	243	{
thejasvi3	0:e33f18af0471	244	pc.printf("on%01d%03d%010d",0,((octave[1] * 12) + i), time_us);
thejasvi3	0:e33f18af0471	245	lcd.fill(66,(36 + (7 * i)),50,6,graphBarColor);
thejasvi3	0:e33f18af0471	246	}
thejasvi3	0:e33f18af0471	247	else
thejasvi3	0:e33f18af0471	248	{
thejasvi3	0:e33f18af0471	249	pc.printf("of%01d%03d%010d",0,((octave[1] * 12) + i), time_us);
thejasvi3	0:e33f18af0471	250	lcd.fill(66,(36 + (7 * i)),50,6,backgroundColor);
thejasvi3	0:e33f18af0471	251	}
thejasvi3	0:e33f18af0471	252	}
thejasvi3	0:e33f18af0471	253	temp = temp >> 1;
thejasvi3	0:e33f18af0471	254	}
thejasvi3	0:e33f18af0471	255
thejasvi3	0:e33f18af0471	256	prev_val[1] = cur_val[1];
thejasvi3	0:e33f18af0471	257	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	13 Oct 2011
Imports:	76
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	2

main.cpp@0:e33f18af0471, 2011-10-13 (annotated)

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