MPR121_Demo2 - DEMO

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Sleek / Mbed 2 deprecated MPR121_Demo2

DEMO

Dependencies: mbed

Fork of MPR121_Demo by jim hamblen

mpr121.cpp@0:e09703934ff4, 2011-03-16 (annotated)

Committer:: 4180_1
Date:: Wed Mar 16 01:49:13 2011 +0000
Revision:: 0:e09703934ff4

Who changed what in which revision?

User	Revision	Line number	New contents of line
4180_1	0:e09703934ff4	1	/*
4180_1	0:e09703934ff4	2	Copyright (c) 2011 Anthony Buckton (abuckton [at] blackink [dot} net {dot} au)
4180_1	0:e09703934ff4	3
4180_1	0:e09703934ff4	4	Permission is hereby granted, free of charge, to any person obtaining a copy
4180_1	0:e09703934ff4	5	of this software and associated documentation files (the "Software"), to deal
4180_1	0:e09703934ff4	6	in the Software without restriction, including without limitation the rights
4180_1	0:e09703934ff4	7	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
4180_1	0:e09703934ff4	8	copies of the Software, and to permit persons to whom the Software is
4180_1	0:e09703934ff4	9	furnished to do so, subject to the following conditions:
4180_1	0:e09703934ff4	10
4180_1	0:e09703934ff4	11	The above copyright notice and this permission notice shall be included in
4180_1	0:e09703934ff4	12	all copies or substantial portions of the Software.
4180_1	0:e09703934ff4	13
4180_1	0:e09703934ff4	14	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
4180_1	0:e09703934ff4	15	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
4180_1	0:e09703934ff4	16	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
4180_1	0:e09703934ff4	17	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
4180_1	0:e09703934ff4	18	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
4180_1	0:e09703934ff4	19	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
4180_1	0:e09703934ff4	20	THE SOFTWARE.
4180_1	0:e09703934ff4	21	*/
4180_1	0:e09703934ff4	22
4180_1	0:e09703934ff4	23	#include <mbed.h>
4180_1	0:e09703934ff4	24	#include <sstream>
4180_1	0:e09703934ff4	25	#include <string>
4180_1	0:e09703934ff4	26	#include <list>
4180_1	0:e09703934ff4	27
4180_1	0:e09703934ff4	28	#include <mpr121.h>
4180_1	0:e09703934ff4	29
4180_1	0:e09703934ff4	30	Mpr121::Mpr121(I2C *i2c, Address i2cAddress)
4180_1	0:e09703934ff4	31	{
4180_1	0:e09703934ff4	32	this->i2c = i2c;
4180_1	0:e09703934ff4	33
4180_1	0:e09703934ff4	34	address = i2cAddress;
4180_1	0:e09703934ff4	35
4180_1	0:e09703934ff4	36	// Configure the MPR121 settings to default
4180_1	0:e09703934ff4	37	this->configureSettings();
4180_1	0:e09703934ff4	38	}
4180_1	0:e09703934ff4	39
4180_1	0:e09703934ff4	40
4180_1	0:e09703934ff4	41	void Mpr121::configureSettings()
4180_1	0:e09703934ff4	42	{
4180_1	0:e09703934ff4	43	// Put the MPR into setup mode
4180_1	0:e09703934ff4	44	this->write(ELE_CFG,0x00);
4180_1	0:e09703934ff4	45
4180_1	0:e09703934ff4	46	// Electrode filters for when data is > baseline
4180_1	0:e09703934ff4	47	unsigned char gtBaseline[] = {
4180_1	0:e09703934ff4	48	0x01, //MHD_R
4180_1	0:e09703934ff4	49	0x01, //NHD_R
4180_1	0:e09703934ff4	50	0x00, //NCL_R
4180_1	0:e09703934ff4	51	0x00 //FDL_R
4180_1	0:e09703934ff4	52	};
4180_1	0:e09703934ff4	53
4180_1	0:e09703934ff4	54	writeMany(MHD_R,gtBaseline,4);
4180_1	0:e09703934ff4	55
4180_1	0:e09703934ff4	56	// Electrode filters for when data is < baseline
4180_1	0:e09703934ff4	57	unsigned char ltBaseline[] = {
4180_1	0:e09703934ff4	58	0x01, //MHD_F
4180_1	0:e09703934ff4	59	0x01, //NHD_F
4180_1	0:e09703934ff4	60	0xFF, //NCL_F
4180_1	0:e09703934ff4	61	0x02 //FDL_F
4180_1	0:e09703934ff4	62	};
4180_1	0:e09703934ff4	63
4180_1	0:e09703934ff4	64	writeMany(MHD_F,ltBaseline,4);
4180_1	0:e09703934ff4	65
4180_1	0:e09703934ff4	66	// Electrode touch and release thresholds
4180_1	0:e09703934ff4	67	unsigned char electrodeThresholds[] = {
4180_1	0:e09703934ff4	68	E_THR_T, // Touch Threshhold
4180_1	0:e09703934ff4	69	E_THR_R // Release Threshold
4180_1	0:e09703934ff4	70	};
4180_1	0:e09703934ff4	71
4180_1	0:e09703934ff4	72	for(int i=0; i<12; i++){
4180_1	0:e09703934ff4	73	int result = writeMany((ELE0_T+(i*2)),electrodeThresholds,2);
4180_1	0:e09703934ff4	74	}
4180_1	0:e09703934ff4	75
4180_1	0:e09703934ff4	76	// Proximity Settings
4180_1	0:e09703934ff4	77	unsigned char proximitySettings[] = {
4180_1	0:e09703934ff4	78	0xff, //MHD_Prox_R
4180_1	0:e09703934ff4	79	0xff, //NHD_Prox_R
4180_1	0:e09703934ff4	80	0x00, //NCL_Prox_R
4180_1	0:e09703934ff4	81	0x00, //FDL_Prox_R
4180_1	0:e09703934ff4	82	0x01, //MHD_Prox_F
4180_1	0:e09703934ff4	83	0x01, //NHD_Prox_F
4180_1	0:e09703934ff4	84	0xFF, //NCL_Prox_F
4180_1	0:e09703934ff4	85	0xff, //FDL_Prox_F
4180_1	0:e09703934ff4	86	0x00, //NHD_Prox_T
4180_1	0:e09703934ff4	87	0x00, //NCL_Prox_T
4180_1	0:e09703934ff4	88	0x00 //NFD_Prox_T
4180_1	0:e09703934ff4	89	};
4180_1	0:e09703934ff4	90	writeMany(MHDPROXR,proximitySettings,11);
4180_1	0:e09703934ff4	91
4180_1	0:e09703934ff4	92	unsigned char proxThresh[] = {
4180_1	0:e09703934ff4	93	PROX_THR_T, // Touch Threshold
4180_1	0:e09703934ff4	94	PROX_THR_R // Release Threshold
4180_1	0:e09703934ff4	95	};
4180_1	0:e09703934ff4	96	writeMany(EPROXTTH,proxThresh,2);
4180_1	0:e09703934ff4	97
4180_1	0:e09703934ff4	98	this->write(FIL_CFG,0x04);
4180_1	0:e09703934ff4	99
4180_1	0:e09703934ff4	100	// Set the electrode config to transition to active mode
4180_1	0:e09703934ff4	101	this->write(ELE_CFG,0x0c);
4180_1	0:e09703934ff4	102	}
4180_1	0:e09703934ff4	103
4180_1	0:e09703934ff4	104	void Mpr121::setElectrodeThreshold(int electrode, unsigned char touch, unsigned char release){
4180_1	0:e09703934ff4	105
4180_1	0:e09703934ff4	106	if(electrode > 11) return;
4180_1	0:e09703934ff4	107
4180_1	0:e09703934ff4	108	// Get the current mode
4180_1	0:e09703934ff4	109	unsigned char mode = this->read(ELE_CFG);
4180_1	0:e09703934ff4	110
4180_1	0:e09703934ff4	111	// Put the MPR into setup mode
4180_1	0:e09703934ff4	112	this->write(ELE_CFG,0x00);
4180_1	0:e09703934ff4	113
4180_1	0:e09703934ff4	114	// Write the new threshold
4180_1	0:e09703934ff4	115	this->write((ELE0_T+(electrode*2)), touch);
4180_1	0:e09703934ff4	116	this->write((ELE0_T+(electrode*2)+1), release);
4180_1	0:e09703934ff4	117
4180_1	0:e09703934ff4	118	//Restore the operating mode
4180_1	0:e09703934ff4	119	this->write(ELE_CFG, mode);
4180_1	0:e09703934ff4	120	}
4180_1	0:e09703934ff4	121
4180_1	0:e09703934ff4	122
4180_1	0:e09703934ff4	123	unsigned char Mpr121::read(int key){
4180_1	0:e09703934ff4	124
4180_1	0:e09703934ff4	125	unsigned char data[2];
4180_1	0:e09703934ff4	126
4180_1	0:e09703934ff4	127	//Start the command
4180_1	0:e09703934ff4	128	i2c->start();
4180_1	0:e09703934ff4	129
4180_1	0:e09703934ff4	130	// Address the target (Write mode)
4180_1	0:e09703934ff4	131	int ack1= i2c->write(address);
4180_1	0:e09703934ff4	132
4180_1	0:e09703934ff4	133	// Set the register key to read
4180_1	0:e09703934ff4	134	int ack2 = i2c->write(key);
4180_1	0:e09703934ff4	135
4180_1	0:e09703934ff4	136	// Re-start for read of data
4180_1	0:e09703934ff4	137	i2c->start();
4180_1	0:e09703934ff4	138
4180_1	0:e09703934ff4	139	// Re-send the target address in read mode
4180_1	0:e09703934ff4	140	int ack3 = i2c->write(address+1);
4180_1	0:e09703934ff4	141
4180_1	0:e09703934ff4	142	// Read in the result
4180_1	0:e09703934ff4	143	data[0] = i2c->read(0);
4180_1	0:e09703934ff4	144
4180_1	0:e09703934ff4	145	// Reset the bus
4180_1	0:e09703934ff4	146	i2c->stop();
4180_1	0:e09703934ff4	147
4180_1	0:e09703934ff4	148	return data[0];
4180_1	0:e09703934ff4	149	}
4180_1	0:e09703934ff4	150
4180_1	0:e09703934ff4	151
4180_1	0:e09703934ff4	152	int Mpr121::write(int key, unsigned char value){
4180_1	0:e09703934ff4	153
4180_1	0:e09703934ff4	154	//Start the command
4180_1	0:e09703934ff4	155	i2c->start();
4180_1	0:e09703934ff4	156
4180_1	0:e09703934ff4	157	// Address the target (Write mode)
4180_1	0:e09703934ff4	158	int ack1= i2c->write(address);
4180_1	0:e09703934ff4	159
4180_1	0:e09703934ff4	160	// Set the register key to write
4180_1	0:e09703934ff4	161	int ack2 = i2c->write(key);
4180_1	0:e09703934ff4	162
4180_1	0:e09703934ff4	163	// Read in the result
4180_1	0:e09703934ff4	164	int ack3 = i2c->write(value);
4180_1	0:e09703934ff4	165
4180_1	0:e09703934ff4	166	// Reset the bus
4180_1	0:e09703934ff4	167	i2c->stop();
4180_1	0:e09703934ff4	168
4180_1	0:e09703934ff4	169	return (ack1+ack2+ack3)-3;
4180_1	0:e09703934ff4	170	}
4180_1	0:e09703934ff4	171
4180_1	0:e09703934ff4	172
4180_1	0:e09703934ff4	173	int Mpr121::writeMany(int start, unsigned char* dataSet, int length){
4180_1	0:e09703934ff4	174	//Start the command
4180_1	0:e09703934ff4	175	i2c->start();
4180_1	0:e09703934ff4	176
4180_1	0:e09703934ff4	177	// Address the target (Write mode)
4180_1	0:e09703934ff4	178	int ack= i2c->write(address);
4180_1	0:e09703934ff4	179	if(ack!=1){
4180_1	0:e09703934ff4	180	return -1;
4180_1	0:e09703934ff4	181	}
4180_1	0:e09703934ff4	182
4180_1	0:e09703934ff4	183	// Set the register key to write
4180_1	0:e09703934ff4	184	ack = i2c->write(start);
4180_1	0:e09703934ff4	185	if(ack!=1){
4180_1	0:e09703934ff4	186	return -1;
4180_1	0:e09703934ff4	187	}
4180_1	0:e09703934ff4	188
4180_1	0:e09703934ff4	189	// Write the date set
4180_1	0:e09703934ff4	190	int count = 0;
4180_1	0:e09703934ff4	191	while(ack==1 && (count < length)){
4180_1	0:e09703934ff4	192	ack = i2c->write(dataSet[count]);
4180_1	0:e09703934ff4	193	count++;
4180_1	0:e09703934ff4	194	}
4180_1	0:e09703934ff4	195	// Stop the cmd
4180_1	0:e09703934ff4	196	i2c->stop();
4180_1	0:e09703934ff4	197
4180_1	0:e09703934ff4	198	return count;
4180_1	0:e09703934ff4	199	}
4180_1	0:e09703934ff4	200
4180_1	0:e09703934ff4	201
4180_1	0:e09703934ff4	202	bool Mpr121::getProximityMode(){
4180_1	0:e09703934ff4	203	if(this->read(ELE_CFG) > 0x0c)
4180_1	0:e09703934ff4	204	return true;
4180_1	0:e09703934ff4	205	else
4180_1	0:e09703934ff4	206	return false;
4180_1	0:e09703934ff4	207	}
4180_1	0:e09703934ff4	208
4180_1	0:e09703934ff4	209	void Mpr121::setProximityMode(bool mode){
4180_1	0:e09703934ff4	210	this->write(ELE_CFG,0x00);
4180_1	0:e09703934ff4	211	if(mode){
4180_1	0:e09703934ff4	212	this->write(ELE_CFG,0x30); //Sense proximity from ALL pads
4180_1	0:e09703934ff4	213	} else {
4180_1	0:e09703934ff4	214	this->write(ELE_CFG,0x0c); //Sense touch, all 12 pads active.
4180_1	0:e09703934ff4	215	}
4180_1	0:e09703934ff4	216	}
4180_1	0:e09703934ff4	217
4180_1	0:e09703934ff4	218
4180_1	0:e09703934ff4	219	int Mpr121::readTouchData(){
4180_1	0:e09703934ff4	220	return this->read(0x00);
4180_1	0:e09703934ff4	221	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	12 Jun 2017
Imports:	1
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	1
Followers:	4

mpr121.cpp@0:e09703934ff4, 2011-03-16 (annotated)

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