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

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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

mpr121.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	/*
thejasvi3	0:e33f18af0471	2	Copyright (c) 2011 Anthony Buckton (abuckton [at] blackink [dot} net {dot} au)
thejasvi3	0:e33f18af0471	3
thejasvi3	0:e33f18af0471	4	Permission is hereby granted, free of charge, to any person obtaining a copy
thejasvi3	0:e33f18af0471	5	of this software and associated documentation files (the "Software"), to deal
thejasvi3	0:e33f18af0471	6	in the Software without restriction, including without limitation the rights
thejasvi3	0:e33f18af0471	7	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
thejasvi3	0:e33f18af0471	8	copies of the Software, and to permit persons to whom the Software is
thejasvi3	0:e33f18af0471	9	furnished to do so, subject to the following conditions:
thejasvi3	0:e33f18af0471	10
thejasvi3	0:e33f18af0471	11	The above copyright notice and this permission notice shall be included in
thejasvi3	0:e33f18af0471	12	all copies or substantial portions of the Software.
thejasvi3	0:e33f18af0471	13
thejasvi3	0:e33f18af0471	14	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
thejasvi3	0:e33f18af0471	15	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
thejasvi3	0:e33f18af0471	16	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
thejasvi3	0:e33f18af0471	17	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
thejasvi3	0:e33f18af0471	18	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
thejasvi3	0:e33f18af0471	19	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
thejasvi3	0:e33f18af0471	20	THE SOFTWARE.
thejasvi3	0:e33f18af0471	21	*/
thejasvi3	0:e33f18af0471	22
thejasvi3	0:e33f18af0471	23	#include <mbed.h>
thejasvi3	0:e33f18af0471	24	#include <sstream>
thejasvi3	0:e33f18af0471	25	#include <string>
thejasvi3	0:e33f18af0471	26	#include <list>
thejasvi3	0:e33f18af0471	27
thejasvi3	0:e33f18af0471	28	#include <mpr121.h>
thejasvi3	0:e33f18af0471	29
thejasvi3	0:e33f18af0471	30	Mpr121::Mpr121(I2C *i2c, Address i2cAddress)
thejasvi3	0:e33f18af0471	31	{
thejasvi3	0:e33f18af0471	32	this->i2c = i2c;
thejasvi3	0:e33f18af0471	33
thejasvi3	0:e33f18af0471	34	address = i2cAddress;
thejasvi3	0:e33f18af0471	35
thejasvi3	0:e33f18af0471	36	// Configure the MPR121 settings to default
thejasvi3	0:e33f18af0471	37	this->configureSettings();
thejasvi3	0:e33f18af0471	38	}
thejasvi3	0:e33f18af0471	39
thejasvi3	0:e33f18af0471	40
thejasvi3	0:e33f18af0471	41	void Mpr121::configureSettings()
thejasvi3	0:e33f18af0471	42	{
thejasvi3	0:e33f18af0471	43	// Put the MPR into setup mode
thejasvi3	0:e33f18af0471	44	this->write(ELE_CFG,0x00);
thejasvi3	0:e33f18af0471	45
thejasvi3	0:e33f18af0471	46	// Electrode filters for when data is > baseline
thejasvi3	0:e33f18af0471	47	unsigned char gtBaseline[] = {
thejasvi3	0:e33f18af0471	48	0x01, //MHD_R
thejasvi3	0:e33f18af0471	49	0x01, //NHD_R
thejasvi3	0:e33f18af0471	50	0x00, //NCL_R
thejasvi3	0:e33f18af0471	51	0x00 //FDL_R
thejasvi3	0:e33f18af0471	52	};
thejasvi3	0:e33f18af0471	53
thejasvi3	0:e33f18af0471	54	writeMany(MHD_R,gtBaseline,4);
thejasvi3	0:e33f18af0471	55
thejasvi3	0:e33f18af0471	56	// Electrode filters for when data is < baseline
thejasvi3	0:e33f18af0471	57	unsigned char ltBaseline[] = {
thejasvi3	0:e33f18af0471	58	0x01, //MHD_F
thejasvi3	0:e33f18af0471	59	0x01, //NHD_F
thejasvi3	0:e33f18af0471	60	0xFF, //NCL_F
thejasvi3	0:e33f18af0471	61	0x02 //FDL_F
thejasvi3	0:e33f18af0471	62	};
thejasvi3	0:e33f18af0471	63
thejasvi3	0:e33f18af0471	64	writeMany(MHD_F,ltBaseline,4);
thejasvi3	0:e33f18af0471	65
thejasvi3	0:e33f18af0471	66	// Electrode touch and release thresholds
thejasvi3	0:e33f18af0471	67	unsigned char electrodeThresholds[] = {
thejasvi3	0:e33f18af0471	68	E_THR_T, // Touch Threshhold
thejasvi3	0:e33f18af0471	69	E_THR_R // Release Threshold
thejasvi3	0:e33f18af0471	70	};
thejasvi3	0:e33f18af0471	71
thejasvi3	0:e33f18af0471	72	for(int i=0; i<12; i++){
thejasvi3	0:e33f18af0471	73	int result = writeMany((ELE0_T+(i*2)),electrodeThresholds,2);
thejasvi3	0:e33f18af0471	74	}
thejasvi3	0:e33f18af0471	75
thejasvi3	0:e33f18af0471	76	// Proximity Settings
thejasvi3	0:e33f18af0471	77	unsigned char proximitySettings[] = {
thejasvi3	0:e33f18af0471	78	0xff, //MHD_Prox_R
thejasvi3	0:e33f18af0471	79	0xff, //NHD_Prox_R
thejasvi3	0:e33f18af0471	80	0x00, //NCL_Prox_R
thejasvi3	0:e33f18af0471	81	0x00, //FDL_Prox_R
thejasvi3	0:e33f18af0471	82	0x01, //MHD_Prox_F
thejasvi3	0:e33f18af0471	83	0x01, //NHD_Prox_F
thejasvi3	0:e33f18af0471	84	0xFF, //NCL_Prox_F
thejasvi3	0:e33f18af0471	85	0xff, //FDL_Prox_F
thejasvi3	0:e33f18af0471	86	0x00, //NHD_Prox_T
thejasvi3	0:e33f18af0471	87	0x00, //NCL_Prox_T
thejasvi3	0:e33f18af0471	88	0x00 //NFD_Prox_T
thejasvi3	0:e33f18af0471	89	};
thejasvi3	0:e33f18af0471	90	writeMany(MHDPROXR,proximitySettings,11);
thejasvi3	0:e33f18af0471	91
thejasvi3	0:e33f18af0471	92	unsigned char proxThresh[] = {
thejasvi3	0:e33f18af0471	93	PROX_THR_T, // Touch Threshold
thejasvi3	0:e33f18af0471	94	PROX_THR_R // Release Threshold
thejasvi3	0:e33f18af0471	95	};
thejasvi3	0:e33f18af0471	96	writeMany(EPROXTTH,proxThresh,2);
thejasvi3	0:e33f18af0471	97
thejasvi3	0:e33f18af0471	98	this->write(FIL_CFG,0x04);
thejasvi3	0:e33f18af0471	99
thejasvi3	0:e33f18af0471	100	// Set the electrode config to transition to active mode
thejasvi3	0:e33f18af0471	101	this->write(ELE_CFG,0x0c);
thejasvi3	0:e33f18af0471	102	}
thejasvi3	0:e33f18af0471	103
thejasvi3	0:e33f18af0471	104	void Mpr121::setElectrodeThreshold(int electrode, unsigned char touch, unsigned char release){
thejasvi3	0:e33f18af0471	105
thejasvi3	0:e33f18af0471	106	if(electrode > 11) return;
thejasvi3	0:e33f18af0471	107
thejasvi3	0:e33f18af0471	108	// Get the current mode
thejasvi3	0:e33f18af0471	109	unsigned char mode = this->read(ELE_CFG);
thejasvi3	0:e33f18af0471	110
thejasvi3	0:e33f18af0471	111	// Put the MPR into setup mode
thejasvi3	0:e33f18af0471	112	this->write(ELE_CFG,0x00);
thejasvi3	0:e33f18af0471	113
thejasvi3	0:e33f18af0471	114	// Write the new threshold
thejasvi3	0:e33f18af0471	115	this->write((ELE0_T+(electrode*2)), touch);
thejasvi3	0:e33f18af0471	116	this->write((ELE0_T+(electrode*2)+1), release);
thejasvi3	0:e33f18af0471	117
thejasvi3	0:e33f18af0471	118	//Restore the operating mode
thejasvi3	0:e33f18af0471	119	this->write(ELE_CFG, mode);
thejasvi3	0:e33f18af0471	120	}
thejasvi3	0:e33f18af0471	121
thejasvi3	0:e33f18af0471	122
thejasvi3	0:e33f18af0471	123	unsigned char Mpr121::read(int key){
thejasvi3	0:e33f18af0471	124
thejasvi3	0:e33f18af0471	125	unsigned char data[2];
thejasvi3	0:e33f18af0471	126
thejasvi3	0:e33f18af0471	127	//Start the command
thejasvi3	0:e33f18af0471	128	i2c->start();
thejasvi3	0:e33f18af0471	129
thejasvi3	0:e33f18af0471	130	// Address the target (Write mode)
thejasvi3	0:e33f18af0471	131	int ack1= i2c->write(address);
thejasvi3	0:e33f18af0471	132
thejasvi3	0:e33f18af0471	133	// Set the register key to read
thejasvi3	0:e33f18af0471	134	int ack2 = i2c->write(key);
thejasvi3	0:e33f18af0471	135
thejasvi3	0:e33f18af0471	136	// Re-start for read of data
thejasvi3	0:e33f18af0471	137	i2c->start();
thejasvi3	0:e33f18af0471	138
thejasvi3	0:e33f18af0471	139	// Re-send the target address in read mode
thejasvi3	0:e33f18af0471	140	int ack3 = i2c->write(address+1);
thejasvi3	0:e33f18af0471	141
thejasvi3	0:e33f18af0471	142	// Read in the result
thejasvi3	0:e33f18af0471	143	data[0] = i2c->read(0);
thejasvi3	0:e33f18af0471	144
thejasvi3	0:e33f18af0471	145	// Reset the bus
thejasvi3	0:e33f18af0471	146	i2c->stop();
thejasvi3	0:e33f18af0471	147
thejasvi3	0:e33f18af0471	148	return data[0];
thejasvi3	0:e33f18af0471	149	}
thejasvi3	0:e33f18af0471	150
thejasvi3	0:e33f18af0471	151
thejasvi3	0:e33f18af0471	152	int Mpr121::write(int key, unsigned char value){
thejasvi3	0:e33f18af0471	153
thejasvi3	0:e33f18af0471	154	//Start the command
thejasvi3	0:e33f18af0471	155	i2c->start();
thejasvi3	0:e33f18af0471	156
thejasvi3	0:e33f18af0471	157	// Address the target (Write mode)
thejasvi3	0:e33f18af0471	158	int ack1= i2c->write(address);
thejasvi3	0:e33f18af0471	159
thejasvi3	0:e33f18af0471	160	// Set the register key to write
thejasvi3	0:e33f18af0471	161	int ack2 = i2c->write(key);
thejasvi3	0:e33f18af0471	162
thejasvi3	0:e33f18af0471	163	// Read in the result
thejasvi3	0:e33f18af0471	164	int ack3 = i2c->write(value);
thejasvi3	0:e33f18af0471	165
thejasvi3	0:e33f18af0471	166	// Reset the bus
thejasvi3	0:e33f18af0471	167	i2c->stop();
thejasvi3	0:e33f18af0471	168
thejasvi3	0:e33f18af0471	169	return (ack1+ack2+ack3)-3;
thejasvi3	0:e33f18af0471	170	}
thejasvi3	0:e33f18af0471	171
thejasvi3	0:e33f18af0471	172
thejasvi3	0:e33f18af0471	173	int Mpr121::writeMany(int start, unsigned char* dataSet, int length){
thejasvi3	0:e33f18af0471	174	//Start the command
thejasvi3	0:e33f18af0471	175	i2c->start();
thejasvi3	0:e33f18af0471	176
thejasvi3	0:e33f18af0471	177	// Address the target (Write mode)
thejasvi3	0:e33f18af0471	178	int ack= i2c->write(address);
thejasvi3	0:e33f18af0471	179	if(ack!=1){
thejasvi3	0:e33f18af0471	180	return -1;
thejasvi3	0:e33f18af0471	181	}
thejasvi3	0:e33f18af0471	182
thejasvi3	0:e33f18af0471	183	// Set the register key to write
thejasvi3	0:e33f18af0471	184	ack = i2c->write(start);
thejasvi3	0:e33f18af0471	185	if(ack!=1){
thejasvi3	0:e33f18af0471	186	return -1;
thejasvi3	0:e33f18af0471	187	}
thejasvi3	0:e33f18af0471	188
thejasvi3	0:e33f18af0471	189	// Write the date set
thejasvi3	0:e33f18af0471	190	int count = 0;
thejasvi3	0:e33f18af0471	191	while(ack==1 && (count < length)){
thejasvi3	0:e33f18af0471	192	ack = i2c->write(dataSet[count]);
thejasvi3	0:e33f18af0471	193	count++;
thejasvi3	0:e33f18af0471	194	}
thejasvi3	0:e33f18af0471	195	// Stop the cmd
thejasvi3	0:e33f18af0471	196	i2c->stop();
thejasvi3	0:e33f18af0471	197
thejasvi3	0:e33f18af0471	198	return count;
thejasvi3	0:e33f18af0471	199	}
thejasvi3	0:e33f18af0471	200
thejasvi3	0:e33f18af0471	201
thejasvi3	0:e33f18af0471	202	bool Mpr121::getProximityMode(){
thejasvi3	0:e33f18af0471	203	if(this->read(ELE_CFG) > 0x0c)
thejasvi3	0:e33f18af0471	204	return true;
thejasvi3	0:e33f18af0471	205	else
thejasvi3	0:e33f18af0471	206	return false;
thejasvi3	0:e33f18af0471	207	}
thejasvi3	0:e33f18af0471	208
thejasvi3	0:e33f18af0471	209	void Mpr121::setProximityMode(bool mode){
thejasvi3	0:e33f18af0471	210	this->write(ELE_CFG,0x00);
thejasvi3	0:e33f18af0471	211	if(mode){
thejasvi3	0:e33f18af0471	212	this->write(ELE_CFG,0x30); //Sense proximity from ALL pads
thejasvi3	0:e33f18af0471	213	} else {
thejasvi3	0:e33f18af0471	214	this->write(ELE_CFG,0x0c); //Sense touch, all 12 pads active.
thejasvi3	0:e33f18af0471	215	}
thejasvi3	0:e33f18af0471	216	}
thejasvi3	0:e33f18af0471	217
thejasvi3	0:e33f18af0471	218
thejasvi3	0:e33f18af0471	219	int Mpr121::readTouchData(){
thejasvi3	0:e33f18af0471	220	return this->read(0x00);
thejasvi3	0:e33f18af0471	221	}

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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

mpr121.cpp@0:e33f18af0471, 2011-10-13 (annotated)

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