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mpr121.cpp@1:44f0b9d5883b, 2011-12-14 (annotated)

Committer:: XkLi
Date:: Wed Dec 14 02:46:16 2011 +0000
Revision:: 1:44f0b9d5883b
Parent:: 0:2fab16867d73

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User	Revision	Line number	New contents of line
XkLi	0:2fab16867d73	1	/*
XkLi	0:2fab16867d73	2	Copyright (c) 2011 Anthony Buckton (abuckton [at] blackink [dot} net {dot} au)
XkLi	0:2fab16867d73	3
XkLi	0:2fab16867d73	4	Permission is hereby granted, free of charge, to any person obtaining a copy
XkLi	0:2fab16867d73	5	of this software and associated documentation files (the "Software"), to deal
XkLi	0:2fab16867d73	6	in the Software without restriction, including without limitation the rights
XkLi	0:2fab16867d73	7	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
XkLi	0:2fab16867d73	8	copies of the Software, and to permit persons to whom the Software is
XkLi	0:2fab16867d73	9	furnished to do so, subject to the following conditions:
XkLi	0:2fab16867d73	10
XkLi	0:2fab16867d73	11	The above copyright notice and this permission notice shall be included in
XkLi	0:2fab16867d73	12	all copies or substantial portions of the Software.
XkLi	0:2fab16867d73	13
XkLi	0:2fab16867d73	14	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
XkLi	0:2fab16867d73	15	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
XkLi	0:2fab16867d73	16	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
XkLi	0:2fab16867d73	17	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
XkLi	0:2fab16867d73	18	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
XkLi	0:2fab16867d73	19	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
XkLi	0:2fab16867d73	20	THE SOFTWARE.
XkLi	0:2fab16867d73	21	*/
XkLi	0:2fab16867d73	22
XkLi	0:2fab16867d73	23	#include <mbed.h>
XkLi	0:2fab16867d73	24	#include <sstream>
XkLi	0:2fab16867d73	25	#include <string>
XkLi	0:2fab16867d73	26	#include <list>
XkLi	0:2fab16867d73	27
XkLi	0:2fab16867d73	28	#include <mpr121.h>
XkLi	0:2fab16867d73	29
XkLi	0:2fab16867d73	30	Mpr121::Mpr121(I2C *i2c, Address i2cAddress)
XkLi	0:2fab16867d73	31	{
XkLi	0:2fab16867d73	32	this->i2c = i2c;
XkLi	0:2fab16867d73	33
XkLi	0:2fab16867d73	34	address = i2cAddress;
XkLi	0:2fab16867d73	35
XkLi	0:2fab16867d73	36	// Configure the MPR121 settings to default
XkLi	0:2fab16867d73	37	this->configureSettings();
XkLi	0:2fab16867d73	38	}
XkLi	0:2fab16867d73	39
XkLi	0:2fab16867d73	40
XkLi	0:2fab16867d73	41	void Mpr121::configureSettings()
XkLi	0:2fab16867d73	42	{
XkLi	0:2fab16867d73	43	// Put the MPR into setup mode
XkLi	0:2fab16867d73	44	this->write(ELE_CFG,0x00);
XkLi	0:2fab16867d73	45	/*
XkLi	0:2fab16867d73	46	this->write(AUTO_CFG_U,201);
XkLi	0:2fab16867d73	47	this->write(AUTO_CFG_T,181);
XkLi	0:2fab16867d73	48	this->write(AUTO_CFG_L,131);
XkLi	0:2fab16867d73	49	this->write(AUTO_CFG_0,0x09);
XkLi	0:2fab16867d73	50	*/
XkLi	0:2fab16867d73	51	// Electrode filters for when data is > baseline
XkLi	0:2fab16867d73	52	unsigned char gtBaseline[] = {
XkLi	0:2fab16867d73	53	0x01, //MHD_R
XkLi	0:2fab16867d73	54	0x01, //NHD_R
XkLi	0:2fab16867d73	55	0x00, //NCL_R
XkLi	0:2fab16867d73	56	0x00 //FDL_R
XkLi	0:2fab16867d73	57	};
XkLi	0:2fab16867d73	58
XkLi	0:2fab16867d73	59	writeMany(MHD_R,gtBaseline,4);
XkLi	0:2fab16867d73	60
XkLi	0:2fab16867d73	61	// Electrode filters for when data is < baseline
XkLi	0:2fab16867d73	62	unsigned char ltBaseline[] = {
XkLi	0:2fab16867d73	63	0x01, //MHD_F
XkLi	0:2fab16867d73	64	0x01, //NHD_F
XkLi	0:2fab16867d73	65	0xFF, //NCL_F
XkLi	0:2fab16867d73	66	0x02 //FDL_F
XkLi	0:2fab16867d73	67	};
XkLi	0:2fab16867d73	68
XkLi	0:2fab16867d73	69	writeMany(MHD_F,ltBaseline,4);
XkLi	0:2fab16867d73	70
XkLi	0:2fab16867d73	71	// Electrode touch and release thresholds
XkLi	0:2fab16867d73	72	unsigned char electrodeThresholds[] = {
XkLi	0:2fab16867d73	73	E_THR_T, // Touch Threshhold
XkLi	0:2fab16867d73	74	E_THR_R // Release Threshold
XkLi	0:2fab16867d73	75	};
XkLi	0:2fab16867d73	76
XkLi	0:2fab16867d73	77	for(int i=0; i<12; i++){
XkLi	0:2fab16867d73	78	int result = writeMany((ELE0_T+(i*2)),electrodeThresholds,2);
XkLi	0:2fab16867d73	79	}
XkLi	0:2fab16867d73	80
XkLi	0:2fab16867d73	81	// Proximity Settings
XkLi	0:2fab16867d73	82	unsigned char proximitySettings[] = {
XkLi	0:2fab16867d73	83	0xff, //MHD_Prox_R
XkLi	0:2fab16867d73	84	0xff, //NHD_Prox_R
XkLi	0:2fab16867d73	85	0x00, //NCL_Prox_R
XkLi	0:2fab16867d73	86	0x00, //FDL_Prox_R
XkLi	0:2fab16867d73	87	0x01, //MHD_Prox_F
XkLi	0:2fab16867d73	88	0x01, //NHD_Prox_F
XkLi	0:2fab16867d73	89	0xFF, //NCL_Prox_F
XkLi	0:2fab16867d73	90	0xff, //FDL_Prox_F
XkLi	0:2fab16867d73	91	0x00, //NHD_Prox_T
XkLi	0:2fab16867d73	92	0x00, //NCL_Prox_T
XkLi	0:2fab16867d73	93	0x00 //NFD_Prox_T
XkLi	0:2fab16867d73	94	};
XkLi	0:2fab16867d73	95	writeMany(MHDPROXR,proximitySettings,11);
XkLi	0:2fab16867d73	96
XkLi	0:2fab16867d73	97	unsigned char proxThresh[] = {
XkLi	0:2fab16867d73	98	PROX_THR_T, // Touch Threshold
XkLi	0:2fab16867d73	99	PROX_THR_R // Release Threshold
XkLi	0:2fab16867d73	100	};
XkLi	0:2fab16867d73	101	writeMany(EPROXTTH,proxThresh,2);
XkLi	0:2fab16867d73	102
XkLi	0:2fab16867d73	103	this->write(FIL_CFG,0x04);
XkLi	0:2fab16867d73	104
XkLi	0:2fab16867d73	105	// Set the electrode config to transition to active mode
XkLi	0:2fab16867d73	106	this->write(ELE_CFG,0x0c);
XkLi	0:2fab16867d73	107
XkLi	0:2fab16867d73	108
XkLi	0:2fab16867d73	109
XkLi	0:2fab16867d73	110
XkLi	0:2fab16867d73	111	}
XkLi	0:2fab16867d73	112
XkLi	0:2fab16867d73	113	void Mpr121::setElectrodeThreshold(int electrode, unsigned char touch, unsigned char release){
XkLi	0:2fab16867d73	114
XkLi	0:2fab16867d73	115	if(electrode > 11) return;
XkLi	0:2fab16867d73	116
XkLi	0:2fab16867d73	117	// Get the current mode
XkLi	0:2fab16867d73	118	unsigned char mode = this->read(ELE_CFG);
XkLi	0:2fab16867d73	119
XkLi	0:2fab16867d73	120	// Put the MPR into setup mode
XkLi	0:2fab16867d73	121	this->write(ELE_CFG,0x00);
XkLi	0:2fab16867d73	122
XkLi	0:2fab16867d73	123	// Write the new threshold
XkLi	0:2fab16867d73	124	this->write((ELE0_T+(electrode*2)), touch);
XkLi	0:2fab16867d73	125	this->write((ELE0_T+(electrode*2)+1), release);
XkLi	0:2fab16867d73	126
XkLi	0:2fab16867d73	127	//Restore the operating mode
XkLi	0:2fab16867d73	128	this->write(ELE_CFG, mode);
XkLi	0:2fab16867d73	129	}
XkLi	0:2fab16867d73	130
XkLi	0:2fab16867d73	131
XkLi	0:2fab16867d73	132	unsigned char Mpr121::read(int key){
XkLi	0:2fab16867d73	133
XkLi	0:2fab16867d73	134	unsigned char data[2];
XkLi	0:2fab16867d73	135
XkLi	0:2fab16867d73	136	//Start the command
XkLi	0:2fab16867d73	137	i2c->start();
XkLi	0:2fab16867d73	138
XkLi	0:2fab16867d73	139	// Address the target (Write mode)
XkLi	0:2fab16867d73	140	int ack1= i2c->write(address);
XkLi	0:2fab16867d73	141
XkLi	0:2fab16867d73	142	// Set the register key to read
XkLi	0:2fab16867d73	143	int ack2 = i2c->write(key);
XkLi	0:2fab16867d73	144
XkLi	0:2fab16867d73	145	// Re-start for read of data
XkLi	0:2fab16867d73	146	i2c->start();
XkLi	0:2fab16867d73	147
XkLi	0:2fab16867d73	148	// Re-send the target address in read mode
XkLi	0:2fab16867d73	149	int ack3 = i2c->write(address+1);
XkLi	0:2fab16867d73	150
XkLi	0:2fab16867d73	151	// Read in the result
XkLi	0:2fab16867d73	152	data[0] = i2c->read(0);
XkLi	0:2fab16867d73	153
XkLi	0:2fab16867d73	154	// Reset the bus
XkLi	0:2fab16867d73	155	i2c->stop();
XkLi	0:2fab16867d73	156
XkLi	0:2fab16867d73	157	return data[0];
XkLi	0:2fab16867d73	158	}
XkLi	0:2fab16867d73	159
XkLi	0:2fab16867d73	160
XkLi	0:2fab16867d73	161	int Mpr121::write(int key, unsigned char value){
XkLi	0:2fab16867d73	162
XkLi	0:2fab16867d73	163	//Start the command
XkLi	0:2fab16867d73	164	i2c->start();
XkLi	0:2fab16867d73	165
XkLi	0:2fab16867d73	166	// Address the target (Write mode)
XkLi	0:2fab16867d73	167	int ack1= i2c->write(address);
XkLi	0:2fab16867d73	168
XkLi	0:2fab16867d73	169	// Set the register key to write
XkLi	0:2fab16867d73	170	int ack2 = i2c->write(key);
XkLi	0:2fab16867d73	171
XkLi	0:2fab16867d73	172	// Read in the result
XkLi	0:2fab16867d73	173	int ack3 = i2c->write(value);
XkLi	0:2fab16867d73	174
XkLi	0:2fab16867d73	175	// Reset the bus
XkLi	0:2fab16867d73	176	i2c->stop();
XkLi	0:2fab16867d73	177
XkLi	0:2fab16867d73	178	return (ack1+ack2+ack3)-3;
XkLi	0:2fab16867d73	179	}
XkLi	0:2fab16867d73	180
XkLi	0:2fab16867d73	181
XkLi	0:2fab16867d73	182	int Mpr121::writeMany(int start, unsigned char* dataSet, int length){
XkLi	0:2fab16867d73	183	//Start the command
XkLi	0:2fab16867d73	184	i2c->start();
XkLi	0:2fab16867d73	185
XkLi	0:2fab16867d73	186	// Address the target (Write mode)
XkLi	0:2fab16867d73	187	int ack= i2c->write(address);
XkLi	0:2fab16867d73	188	if(ack!=1){
XkLi	0:2fab16867d73	189	return -1;
XkLi	0:2fab16867d73	190	}
XkLi	0:2fab16867d73	191
XkLi	0:2fab16867d73	192	// Set the register key to write
XkLi	0:2fab16867d73	193	ack = i2c->write(start);
XkLi	0:2fab16867d73	194	if(ack!=1){
XkLi	0:2fab16867d73	195	return -1;
XkLi	0:2fab16867d73	196	}
XkLi	0:2fab16867d73	197
XkLi	0:2fab16867d73	198	// Write the date set
XkLi	0:2fab16867d73	199	int count = 0;
XkLi	0:2fab16867d73	200	while(ack==1 && (count < length)){
XkLi	0:2fab16867d73	201	ack = i2c->write(dataSet[count]);
XkLi	0:2fab16867d73	202	count++;
XkLi	0:2fab16867d73	203	}
XkLi	0:2fab16867d73	204	// Stop the cmd
XkLi	0:2fab16867d73	205	i2c->stop();
XkLi	0:2fab16867d73	206
XkLi	0:2fab16867d73	207	return count;
XkLi	0:2fab16867d73	208	}
XkLi	0:2fab16867d73	209
XkLi	0:2fab16867d73	210
XkLi	0:2fab16867d73	211	bool Mpr121::getProximityMode(){
XkLi	0:2fab16867d73	212	if(this->read(ELE_CFG) > 0x0c)
XkLi	0:2fab16867d73	213	return true;
XkLi	0:2fab16867d73	214	else
XkLi	0:2fab16867d73	215	return false;
XkLi	0:2fab16867d73	216	}
XkLi	0:2fab16867d73	217
XkLi	0:2fab16867d73	218	void Mpr121::setProximityMode(bool mode){
XkLi	0:2fab16867d73	219	this->write(ELE_CFG,0x00);
XkLi	0:2fab16867d73	220	if(mode){
XkLi	0:2fab16867d73	221	this->write(ELE_CFG,0x30); //Sense proximity from ALL pads
XkLi	0:2fab16867d73	222	} else {
XkLi	0:2fab16867d73	223	this->write(ELE_CFG,0x0c); //Sense touch, all 12 pads active.
XkLi	0:2fab16867d73	224	}
XkLi	0:2fab16867d73	225	}
XkLi	0:2fab16867d73	226
XkLi	0:2fab16867d73	227
XkLi	0:2fab16867d73	228	int Mpr121::readTouchData(){
XkLi	0:2fab16867d73	229	return this->read(0x00);
XkLi	0:2fab16867d73	230	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	30 Nov 2011
Imports:	1
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	1
Followers:	1

mpr121.cpp@1:44f0b9d5883b, 2011-12-14 (annotated)

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