Max Brown / Mbed 2 deprecated Capacitive_Touch_Sensor_MP3_Player

Capacitive Touch Sensor Controlling an MP3 Player

Dependencies:   4DGL-uLCD-SE SDFileSystem TextLCD mbed wave_player

mpr121.cpp@0:1cb83aab3f9a, 2016-12-08 (annotated)

Committer:
maxmbrown
Date:
Thu Dec 08 20:20:09 2016 +0000
Revision:
0:1cb83aab3f9a
Capacitive Touch Sensor Controlling an MP3 Player

Who changed what in which revision?

UserRevisionLine numberNew contents of line
maxmbrown 0:1cb83aab3f9a 1 /*
maxmbrown 0:1cb83aab3f9a 2 Copyright (c) 2011 Anthony Buckton (abuckton [at] blackink [dot} net {dot} au)
maxmbrown 0:1cb83aab3f9a 3
maxmbrown 0:1cb83aab3f9a 4 Permission is hereby granted, free of charge, to any person obtaining a copy
maxmbrown 0:1cb83aab3f9a 5 of this software and associated documentation files (the "Software"), to deal
maxmbrown 0:1cb83aab3f9a 6 in the Software without restriction, including without limitation the rights
maxmbrown 0:1cb83aab3f9a 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
maxmbrown 0:1cb83aab3f9a 8 copies of the Software, and to permit persons to whom the Software is
maxmbrown 0:1cb83aab3f9a 9 furnished to do so, subject to the following conditions:
maxmbrown 0:1cb83aab3f9a 10
maxmbrown 0:1cb83aab3f9a 11 The above copyright notice and this permission notice shall be included in
maxmbrown 0:1cb83aab3f9a 12 all copies or substantial portions of the Software.
maxmbrown 0:1cb83aab3f9a 13
maxmbrown 0:1cb83aab3f9a 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
maxmbrown 0:1cb83aab3f9a 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
maxmbrown 0:1cb83aab3f9a 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
maxmbrown 0:1cb83aab3f9a 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
maxmbrown 0:1cb83aab3f9a 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
maxmbrown 0:1cb83aab3f9a 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
maxmbrown 0:1cb83aab3f9a 20 THE SOFTWARE.
maxmbrown 0:1cb83aab3f9a 21 */
maxmbrown 0:1cb83aab3f9a 22
maxmbrown 0:1cb83aab3f9a 23 #include <mbed.h>
maxmbrown 0:1cb83aab3f9a 24 #include <sstream>
maxmbrown 0:1cb83aab3f9a 25 #include <string>
maxmbrown 0:1cb83aab3f9a 26 #include <list>
maxmbrown 0:1cb83aab3f9a 27
maxmbrown 0:1cb83aab3f9a 28 #include <mpr121.h>
maxmbrown 0:1cb83aab3f9a 29
maxmbrown 0:1cb83aab3f9a 30 Mpr121::Mpr121(I2C *i2c, Address i2cAddress)
maxmbrown 0:1cb83aab3f9a 31 {
maxmbrown 0:1cb83aab3f9a 32 this->i2c = i2c;
maxmbrown 0:1cb83aab3f9a 33
maxmbrown 0:1cb83aab3f9a 34 address = i2cAddress;
maxmbrown 0:1cb83aab3f9a 35
maxmbrown 0:1cb83aab3f9a 36 // Configure the MPR121 settings to default
maxmbrown 0:1cb83aab3f9a 37 this->configureSettings();
maxmbrown 0:1cb83aab3f9a 38 }
maxmbrown 0:1cb83aab3f9a 39
maxmbrown 0:1cb83aab3f9a 40
maxmbrown 0:1cb83aab3f9a 41 void Mpr121::configureSettings()
maxmbrown 0:1cb83aab3f9a 42 {
maxmbrown 0:1cb83aab3f9a 43 // Put the MPR into setup mode
maxmbrown 0:1cb83aab3f9a 44 this->write(ELE_CFG,0x00);
maxmbrown 0:1cb83aab3f9a 45
maxmbrown 0:1cb83aab3f9a 46 // Electrode filters for when data is > baseline
maxmbrown 0:1cb83aab3f9a 47 unsigned char gtBaseline[] = {
maxmbrown 0:1cb83aab3f9a 48 0x01, //MHD_R
maxmbrown 0:1cb83aab3f9a 49 0x01, //NHD_R
maxmbrown 0:1cb83aab3f9a 50 0x00, //NCL_R
maxmbrown 0:1cb83aab3f9a 51 0x00 //FDL_R
maxmbrown 0:1cb83aab3f9a 52 };
maxmbrown 0:1cb83aab3f9a 53
maxmbrown 0:1cb83aab3f9a 54 writeMany(MHD_R,gtBaseline,4);
maxmbrown 0:1cb83aab3f9a 55
maxmbrown 0:1cb83aab3f9a 56 // Electrode filters for when data is < baseline
maxmbrown 0:1cb83aab3f9a 57 unsigned char ltBaseline[] = {
maxmbrown 0:1cb83aab3f9a 58 0x01, //MHD_F
maxmbrown 0:1cb83aab3f9a 59 0x01, //NHD_F
maxmbrown 0:1cb83aab3f9a 60 0xFF, //NCL_F
maxmbrown 0:1cb83aab3f9a 61 0x02 //FDL_F
maxmbrown 0:1cb83aab3f9a 62 };
maxmbrown 0:1cb83aab3f9a 63
maxmbrown 0:1cb83aab3f9a 64 writeMany(MHD_F,ltBaseline,4);
maxmbrown 0:1cb83aab3f9a 65
maxmbrown 0:1cb83aab3f9a 66 // Electrode touch and release thresholds
maxmbrown 0:1cb83aab3f9a 67 unsigned char electrodeThresholds[] = {
maxmbrown 0:1cb83aab3f9a 68 E_THR_T, // Touch Threshhold
maxmbrown 0:1cb83aab3f9a 69 E_THR_R // Release Threshold
maxmbrown 0:1cb83aab3f9a 70 };
maxmbrown 0:1cb83aab3f9a 71
maxmbrown 0:1cb83aab3f9a 72 for(int i=0; i<12; i++){
maxmbrown 0:1cb83aab3f9a 73 int result = writeMany((ELE0_T+(i*2)),electrodeThresholds,2);
maxmbrown 0:1cb83aab3f9a 74 }
maxmbrown 0:1cb83aab3f9a 75
maxmbrown 0:1cb83aab3f9a 76 // Proximity Settings
maxmbrown 0:1cb83aab3f9a 77 unsigned char proximitySettings[] = {
maxmbrown 0:1cb83aab3f9a 78 0xff, //MHD_Prox_R
maxmbrown 0:1cb83aab3f9a 79 0xff, //NHD_Prox_R
maxmbrown 0:1cb83aab3f9a 80 0x00, //NCL_Prox_R
maxmbrown 0:1cb83aab3f9a 81 0x00, //FDL_Prox_R
maxmbrown 0:1cb83aab3f9a 82 0x01, //MHD_Prox_F
maxmbrown 0:1cb83aab3f9a 83 0x01, //NHD_Prox_F
maxmbrown 0:1cb83aab3f9a 84 0xFF, //NCL_Prox_F
maxmbrown 0:1cb83aab3f9a 85 0xff, //FDL_Prox_F
maxmbrown 0:1cb83aab3f9a 86 0x00, //NHD_Prox_T
maxmbrown 0:1cb83aab3f9a 87 0x00, //NCL_Prox_T
maxmbrown 0:1cb83aab3f9a 88 0x00 //NFD_Prox_T
maxmbrown 0:1cb83aab3f9a 89 };
maxmbrown 0:1cb83aab3f9a 90 writeMany(MHDPROXR,proximitySettings,11);
maxmbrown 0:1cb83aab3f9a 91
maxmbrown 0:1cb83aab3f9a 92 unsigned char proxThresh[] = {
maxmbrown 0:1cb83aab3f9a 93 PROX_THR_T, // Touch Threshold
maxmbrown 0:1cb83aab3f9a 94 PROX_THR_R // Release Threshold
maxmbrown 0:1cb83aab3f9a 95 };
maxmbrown 0:1cb83aab3f9a 96 writeMany(EPROXTTH,proxThresh,2);
maxmbrown 0:1cb83aab3f9a 97
maxmbrown 0:1cb83aab3f9a 98 this->write(FIL_CFG,0x04);
maxmbrown 0:1cb83aab3f9a 99
maxmbrown 0:1cb83aab3f9a 100 // Set the electrode config to transition to active mode
maxmbrown 0:1cb83aab3f9a 101 this->write(ELE_CFG,0x0c);
maxmbrown 0:1cb83aab3f9a 102 }
maxmbrown 0:1cb83aab3f9a 103
maxmbrown 0:1cb83aab3f9a 104 void Mpr121::setElectrodeThreshold(int electrode, unsigned char touch, unsigned char release){
maxmbrown 0:1cb83aab3f9a 105
maxmbrown 0:1cb83aab3f9a 106 if(electrode > 11) return;
maxmbrown 0:1cb83aab3f9a 107
maxmbrown 0:1cb83aab3f9a 108 // Get the current mode
maxmbrown 0:1cb83aab3f9a 109 unsigned char mode = this->read(ELE_CFG);
maxmbrown 0:1cb83aab3f9a 110
maxmbrown 0:1cb83aab3f9a 111 // Put the MPR into setup mode
maxmbrown 0:1cb83aab3f9a 112 this->write(ELE_CFG,0x00);
maxmbrown 0:1cb83aab3f9a 113
maxmbrown 0:1cb83aab3f9a 114 // Write the new threshold
maxmbrown 0:1cb83aab3f9a 115 this->write((ELE0_T+(electrode*2)), touch);
maxmbrown 0:1cb83aab3f9a 116 this->write((ELE0_T+(electrode*2)+1), release);
maxmbrown 0:1cb83aab3f9a 117
maxmbrown 0:1cb83aab3f9a 118 //Restore the operating mode
maxmbrown 0:1cb83aab3f9a 119 this->write(ELE_CFG, mode);
maxmbrown 0:1cb83aab3f9a 120 }
maxmbrown 0:1cb83aab3f9a 121
maxmbrown 0:1cb83aab3f9a 122
maxmbrown 0:1cb83aab3f9a 123 unsigned char Mpr121::read(int key){
maxmbrown 0:1cb83aab3f9a 124
maxmbrown 0:1cb83aab3f9a 125 unsigned char data[2];
maxmbrown 0:1cb83aab3f9a 126
maxmbrown 0:1cb83aab3f9a 127 //Start the command
maxmbrown 0:1cb83aab3f9a 128 i2c->start();
maxmbrown 0:1cb83aab3f9a 129
maxmbrown 0:1cb83aab3f9a 130 // Address the target (Write mode)
maxmbrown 0:1cb83aab3f9a 131 int ack1= i2c->write(address);
maxmbrown 0:1cb83aab3f9a 132
maxmbrown 0:1cb83aab3f9a 133 // Set the register key to read
maxmbrown 0:1cb83aab3f9a 134 int ack2 = i2c->write(key);
maxmbrown 0:1cb83aab3f9a 135
maxmbrown 0:1cb83aab3f9a 136 // Re-start for read of data
maxmbrown 0:1cb83aab3f9a 137 i2c->start();
maxmbrown 0:1cb83aab3f9a 138
maxmbrown 0:1cb83aab3f9a 139 // Re-send the target address in read mode
maxmbrown 0:1cb83aab3f9a 140 int ack3 = i2c->write(address+1);
maxmbrown 0:1cb83aab3f9a 141
maxmbrown 0:1cb83aab3f9a 142 // Read in the result
maxmbrown 0:1cb83aab3f9a 143 data[0] = i2c->read(0);
maxmbrown 0:1cb83aab3f9a 144
maxmbrown 0:1cb83aab3f9a 145 // Reset the bus
maxmbrown 0:1cb83aab3f9a 146 i2c->stop();
maxmbrown 0:1cb83aab3f9a 147
maxmbrown 0:1cb83aab3f9a 148 return data[0];
maxmbrown 0:1cb83aab3f9a 149 }
maxmbrown 0:1cb83aab3f9a 150
maxmbrown 0:1cb83aab3f9a 151
maxmbrown 0:1cb83aab3f9a 152 int Mpr121::write(int key, unsigned char value){
maxmbrown 0:1cb83aab3f9a 153
maxmbrown 0:1cb83aab3f9a 154 //Start the command
maxmbrown 0:1cb83aab3f9a 155 i2c->start();
maxmbrown 0:1cb83aab3f9a 156
maxmbrown 0:1cb83aab3f9a 157 // Address the target (Write mode)
maxmbrown 0:1cb83aab3f9a 158 int ack1= i2c->write(address);
maxmbrown 0:1cb83aab3f9a 159
maxmbrown 0:1cb83aab3f9a 160 // Set the register key to write
maxmbrown 0:1cb83aab3f9a 161 int ack2 = i2c->write(key);
maxmbrown 0:1cb83aab3f9a 162
maxmbrown 0:1cb83aab3f9a 163 // Read in the result
maxmbrown 0:1cb83aab3f9a 164 int ack3 = i2c->write(value);
maxmbrown 0:1cb83aab3f9a 165
maxmbrown 0:1cb83aab3f9a 166 // Reset the bus
maxmbrown 0:1cb83aab3f9a 167 i2c->stop();
maxmbrown 0:1cb83aab3f9a 168
maxmbrown 0:1cb83aab3f9a 169 return (ack1+ack2+ack3)-3;
maxmbrown 0:1cb83aab3f9a 170 }
maxmbrown 0:1cb83aab3f9a 171
maxmbrown 0:1cb83aab3f9a 172
maxmbrown 0:1cb83aab3f9a 173 int Mpr121::writeMany(int start, unsigned char* dataSet, int length){
maxmbrown 0:1cb83aab3f9a 174 //Start the command
maxmbrown 0:1cb83aab3f9a 175 i2c->start();
maxmbrown 0:1cb83aab3f9a 176
maxmbrown 0:1cb83aab3f9a 177 // Address the target (Write mode)
maxmbrown 0:1cb83aab3f9a 178 int ack= i2c->write(address);
maxmbrown 0:1cb83aab3f9a 179 if(ack!=1){
maxmbrown 0:1cb83aab3f9a 180 return -1;
maxmbrown 0:1cb83aab3f9a 181 }
maxmbrown 0:1cb83aab3f9a 182
maxmbrown 0:1cb83aab3f9a 183 // Set the register key to write
maxmbrown 0:1cb83aab3f9a 184 ack = i2c->write(start);
maxmbrown 0:1cb83aab3f9a 185 if(ack!=1){
maxmbrown 0:1cb83aab3f9a 186 return -1;
maxmbrown 0:1cb83aab3f9a 187 }
maxmbrown 0:1cb83aab3f9a 188
maxmbrown 0:1cb83aab3f9a 189 // Write the date set
maxmbrown 0:1cb83aab3f9a 190 int count = 0;
maxmbrown 0:1cb83aab3f9a 191 while(ack==1 && (count < length)){
maxmbrown 0:1cb83aab3f9a 192 ack = i2c->write(dataSet[count]);
maxmbrown 0:1cb83aab3f9a 193 count++;
maxmbrown 0:1cb83aab3f9a 194 }
maxmbrown 0:1cb83aab3f9a 195 // Stop the cmd
maxmbrown 0:1cb83aab3f9a 196 i2c->stop();
maxmbrown 0:1cb83aab3f9a 197
maxmbrown 0:1cb83aab3f9a 198 return count;
maxmbrown 0:1cb83aab3f9a 199 }
maxmbrown 0:1cb83aab3f9a 200
maxmbrown 0:1cb83aab3f9a 201
maxmbrown 0:1cb83aab3f9a 202 bool Mpr121::getProximityMode(){
maxmbrown 0:1cb83aab3f9a 203 if(this->read(ELE_CFG) > 0x0c)
maxmbrown 0:1cb83aab3f9a 204 return true;
maxmbrown 0:1cb83aab3f9a 205 else
maxmbrown 0:1cb83aab3f9a 206 return false;
maxmbrown 0:1cb83aab3f9a 207 }
maxmbrown 0:1cb83aab3f9a 208
maxmbrown 0:1cb83aab3f9a 209 void Mpr121::setProximityMode(bool mode){
maxmbrown 0:1cb83aab3f9a 210 this->write(ELE_CFG,0x00);
maxmbrown 0:1cb83aab3f9a 211 if(mode){
maxmbrown 0:1cb83aab3f9a 212 this->write(ELE_CFG,0x30); //Sense proximity from ALL pads
maxmbrown 0:1cb83aab3f9a 213 } else {
maxmbrown 0:1cb83aab3f9a 214 this->write(ELE_CFG,0x0c); //Sense touch, all 12 pads active.
maxmbrown 0:1cb83aab3f9a 215 }
maxmbrown 0:1cb83aab3f9a 216 }
maxmbrown 0:1cb83aab3f9a 217
maxmbrown 0:1cb83aab3f9a 218
maxmbrown 0:1cb83aab3f9a 219 int Mpr121::readTouchData(){
maxmbrown 0:1cb83aab3f9a 220 return this->read(0x00);
maxmbrown 0:1cb83aab3f9a 221 }