m b / Mbed 2 deprecated 4180Lab1

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Dependencies:   mbed

mpr121.cpp@3:ecfa4fa0b5a7, 2016-01-30 (annotated)

Committer:
mikeb
Date:
Sat Jan 30 03:22:41 2016 +0000
Revision:
3:ecfa4fa0b5a7
Complete;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mikeb 3:ecfa4fa0b5a7 1 /*
mikeb 3:ecfa4fa0b5a7 2 Copyright (c) 2011 Anthony Buckton (abuckton [at] blackink [dot} net {dot} au)
mikeb 3:ecfa4fa0b5a7 3
mikeb 3:ecfa4fa0b5a7 4 Permission is hereby granted, free of charge, to any person obtaining a copy
mikeb 3:ecfa4fa0b5a7 5 of this software and associated documentation files (the "Software"), to deal
mikeb 3:ecfa4fa0b5a7 6 in the Software without restriction, including without limitation the rights
mikeb 3:ecfa4fa0b5a7 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
mikeb 3:ecfa4fa0b5a7 8 copies of the Software, and to permit persons to whom the Software is
mikeb 3:ecfa4fa0b5a7 9 furnished to do so, subject to the following conditions:
mikeb 3:ecfa4fa0b5a7 10
mikeb 3:ecfa4fa0b5a7 11 The above copyright notice and this permission notice shall be included in
mikeb 3:ecfa4fa0b5a7 12 all copies or substantial portions of the Software.
mikeb 3:ecfa4fa0b5a7 13
mikeb 3:ecfa4fa0b5a7 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
mikeb 3:ecfa4fa0b5a7 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mikeb 3:ecfa4fa0b5a7 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mikeb 3:ecfa4fa0b5a7 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mikeb 3:ecfa4fa0b5a7 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
mikeb 3:ecfa4fa0b5a7 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
mikeb 3:ecfa4fa0b5a7 20 THE SOFTWARE.
mikeb 3:ecfa4fa0b5a7 21 */
mikeb 3:ecfa4fa0b5a7 22
mikeb 3:ecfa4fa0b5a7 23 #include <mbed.h>
mikeb 3:ecfa4fa0b5a7 24 #include <sstream>
mikeb 3:ecfa4fa0b5a7 25 #include <string>
mikeb 3:ecfa4fa0b5a7 26 #include <list>
mikeb 3:ecfa4fa0b5a7 27
mikeb 3:ecfa4fa0b5a7 28 #include <mpr121.h>
mikeb 3:ecfa4fa0b5a7 29
mikeb 3:ecfa4fa0b5a7 30 Mpr121::Mpr121(I2C *i2c, Address i2cAddress)
mikeb 3:ecfa4fa0b5a7 31 {
mikeb 3:ecfa4fa0b5a7 32 this->i2c = i2c;
mikeb 3:ecfa4fa0b5a7 33
mikeb 3:ecfa4fa0b5a7 34 address = i2cAddress;
mikeb 3:ecfa4fa0b5a7 35
mikeb 3:ecfa4fa0b5a7 36 // Configure the MPR121 settings to default
mikeb 3:ecfa4fa0b5a7 37 this->configureSettings();
mikeb 3:ecfa4fa0b5a7 38 }
mikeb 3:ecfa4fa0b5a7 39
mikeb 3:ecfa4fa0b5a7 40
mikeb 3:ecfa4fa0b5a7 41 void Mpr121::configureSettings()
mikeb 3:ecfa4fa0b5a7 42 {
mikeb 3:ecfa4fa0b5a7 43 // Put the MPR into setup mode
mikeb 3:ecfa4fa0b5a7 44 this->write(ELE_CFG,0x00);
mikeb 3:ecfa4fa0b5a7 45
mikeb 3:ecfa4fa0b5a7 46 // Electrode filters for when data is > baseline
mikeb 3:ecfa4fa0b5a7 47 unsigned char gtBaseline[] = {
mikeb 3:ecfa4fa0b5a7 48 0x01, //MHD_R
mikeb 3:ecfa4fa0b5a7 49 0x01, //NHD_R
mikeb 3:ecfa4fa0b5a7 50 0x00, //NCL_R
mikeb 3:ecfa4fa0b5a7 51 0x00 //FDL_R
mikeb 3:ecfa4fa0b5a7 52 };
mikeb 3:ecfa4fa0b5a7 53
mikeb 3:ecfa4fa0b5a7 54 writeMany(MHD_R,gtBaseline,4);
mikeb 3:ecfa4fa0b5a7 55
mikeb 3:ecfa4fa0b5a7 56 // Electrode filters for when data is < baseline
mikeb 3:ecfa4fa0b5a7 57 unsigned char ltBaseline[] = {
mikeb 3:ecfa4fa0b5a7 58 0x01, //MHD_F
mikeb 3:ecfa4fa0b5a7 59 0x01, //NHD_F
mikeb 3:ecfa4fa0b5a7 60 0xFF, //NCL_F
mikeb 3:ecfa4fa0b5a7 61 0x02 //FDL_F
mikeb 3:ecfa4fa0b5a7 62 };
mikeb 3:ecfa4fa0b5a7 63
mikeb 3:ecfa4fa0b5a7 64 writeMany(MHD_F,ltBaseline,4);
mikeb 3:ecfa4fa0b5a7 65
mikeb 3:ecfa4fa0b5a7 66 // Electrode touch and release thresholds
mikeb 3:ecfa4fa0b5a7 67 unsigned char electrodeThresholds[] = {
mikeb 3:ecfa4fa0b5a7 68 E_THR_T, // Touch Threshhold
mikeb 3:ecfa4fa0b5a7 69 E_THR_R // Release Threshold
mikeb 3:ecfa4fa0b5a7 70 };
mikeb 3:ecfa4fa0b5a7 71
mikeb 3:ecfa4fa0b5a7 72 for(int i=0; i<12; i++){
mikeb 3:ecfa4fa0b5a7 73 int result = writeMany((ELE0_T+(i*2)),electrodeThresholds,2);
mikeb 3:ecfa4fa0b5a7 74 }
mikeb 3:ecfa4fa0b5a7 75
mikeb 3:ecfa4fa0b5a7 76 // Proximity Settings
mikeb 3:ecfa4fa0b5a7 77 unsigned char proximitySettings[] = {
mikeb 3:ecfa4fa0b5a7 78 0xff, //MHD_Prox_R
mikeb 3:ecfa4fa0b5a7 79 0xff, //NHD_Prox_R
mikeb 3:ecfa4fa0b5a7 80 0x00, //NCL_Prox_R
mikeb 3:ecfa4fa0b5a7 81 0x00, //FDL_Prox_R
mikeb 3:ecfa4fa0b5a7 82 0x01, //MHD_Prox_F
mikeb 3:ecfa4fa0b5a7 83 0x01, //NHD_Prox_F
mikeb 3:ecfa4fa0b5a7 84 0xFF, //NCL_Prox_F
mikeb 3:ecfa4fa0b5a7 85 0xff, //FDL_Prox_F
mikeb 3:ecfa4fa0b5a7 86 0x00, //NHD_Prox_T
mikeb 3:ecfa4fa0b5a7 87 0x00, //NCL_Prox_T
mikeb 3:ecfa4fa0b5a7 88 0x00 //NFD_Prox_T
mikeb 3:ecfa4fa0b5a7 89 };
mikeb 3:ecfa4fa0b5a7 90 writeMany(MHDPROXR,proximitySettings,11);
mikeb 3:ecfa4fa0b5a7 91
mikeb 3:ecfa4fa0b5a7 92 unsigned char proxThresh[] = {
mikeb 3:ecfa4fa0b5a7 93 PROX_THR_T, // Touch Threshold
mikeb 3:ecfa4fa0b5a7 94 PROX_THR_R // Release Threshold
mikeb 3:ecfa4fa0b5a7 95 };
mikeb 3:ecfa4fa0b5a7 96 writeMany(EPROXTTH,proxThresh,2);
mikeb 3:ecfa4fa0b5a7 97
mikeb 3:ecfa4fa0b5a7 98 this->write(FIL_CFG,0x04);
mikeb 3:ecfa4fa0b5a7 99
mikeb 3:ecfa4fa0b5a7 100 // Set the electrode config to transition to active mode
mikeb 3:ecfa4fa0b5a7 101 this->write(ELE_CFG,0x0c);
mikeb 3:ecfa4fa0b5a7 102 }
mikeb 3:ecfa4fa0b5a7 103
mikeb 3:ecfa4fa0b5a7 104 void Mpr121::setElectrodeThreshold(int electrode, unsigned char touch, unsigned char release){
mikeb 3:ecfa4fa0b5a7 105
mikeb 3:ecfa4fa0b5a7 106 if(electrode > 11) return;
mikeb 3:ecfa4fa0b5a7 107
mikeb 3:ecfa4fa0b5a7 108 // Get the current mode
mikeb 3:ecfa4fa0b5a7 109 unsigned char mode = this->read(ELE_CFG);
mikeb 3:ecfa4fa0b5a7 110
mikeb 3:ecfa4fa0b5a7 111 // Put the MPR into setup mode
mikeb 3:ecfa4fa0b5a7 112 this->write(ELE_CFG,0x00);
mikeb 3:ecfa4fa0b5a7 113
mikeb 3:ecfa4fa0b5a7 114 // Write the new threshold
mikeb 3:ecfa4fa0b5a7 115 this->write((ELE0_T+(electrode*2)), touch);
mikeb 3:ecfa4fa0b5a7 116 this->write((ELE0_T+(electrode*2)+1), release);
mikeb 3:ecfa4fa0b5a7 117
mikeb 3:ecfa4fa0b5a7 118 //Restore the operating mode
mikeb 3:ecfa4fa0b5a7 119 this->write(ELE_CFG, mode);
mikeb 3:ecfa4fa0b5a7 120 }
mikeb 3:ecfa4fa0b5a7 121
mikeb 3:ecfa4fa0b5a7 122
mikeb 3:ecfa4fa0b5a7 123 unsigned char Mpr121::read(int key){
mikeb 3:ecfa4fa0b5a7 124
mikeb 3:ecfa4fa0b5a7 125 unsigned char data[2];
mikeb 3:ecfa4fa0b5a7 126
mikeb 3:ecfa4fa0b5a7 127 //Start the command
mikeb 3:ecfa4fa0b5a7 128 i2c->start();
mikeb 3:ecfa4fa0b5a7 129
mikeb 3:ecfa4fa0b5a7 130 // Address the target (Write mode)
mikeb 3:ecfa4fa0b5a7 131 int ack1= i2c->write(address);
mikeb 3:ecfa4fa0b5a7 132
mikeb 3:ecfa4fa0b5a7 133 // Set the register key to read
mikeb 3:ecfa4fa0b5a7 134 int ack2 = i2c->write(key);
mikeb 3:ecfa4fa0b5a7 135
mikeb 3:ecfa4fa0b5a7 136 // Re-start for read of data
mikeb 3:ecfa4fa0b5a7 137 i2c->start();
mikeb 3:ecfa4fa0b5a7 138
mikeb 3:ecfa4fa0b5a7 139 // Re-send the target address in read mode
mikeb 3:ecfa4fa0b5a7 140 int ack3 = i2c->write(address+1);
mikeb 3:ecfa4fa0b5a7 141
mikeb 3:ecfa4fa0b5a7 142 // Read in the result
mikeb 3:ecfa4fa0b5a7 143 data[0] = i2c->read(0);
mikeb 3:ecfa4fa0b5a7 144
mikeb 3:ecfa4fa0b5a7 145 // Reset the bus
mikeb 3:ecfa4fa0b5a7 146 i2c->stop();
mikeb 3:ecfa4fa0b5a7 147
mikeb 3:ecfa4fa0b5a7 148 return data[0];
mikeb 3:ecfa4fa0b5a7 149 }
mikeb 3:ecfa4fa0b5a7 150
mikeb 3:ecfa4fa0b5a7 151
mikeb 3:ecfa4fa0b5a7 152 int Mpr121::write(int key, unsigned char value){
mikeb 3:ecfa4fa0b5a7 153
mikeb 3:ecfa4fa0b5a7 154 //Start the command
mikeb 3:ecfa4fa0b5a7 155 i2c->start();
mikeb 3:ecfa4fa0b5a7 156
mikeb 3:ecfa4fa0b5a7 157 // Address the target (Write mode)
mikeb 3:ecfa4fa0b5a7 158 int ack1= i2c->write(address);
mikeb 3:ecfa4fa0b5a7 159
mikeb 3:ecfa4fa0b5a7 160 // Set the register key to write
mikeb 3:ecfa4fa0b5a7 161 int ack2 = i2c->write(key);
mikeb 3:ecfa4fa0b5a7 162
mikeb 3:ecfa4fa0b5a7 163 // Read in the result
mikeb 3:ecfa4fa0b5a7 164 int ack3 = i2c->write(value);
mikeb 3:ecfa4fa0b5a7 165
mikeb 3:ecfa4fa0b5a7 166 // Reset the bus
mikeb 3:ecfa4fa0b5a7 167 i2c->stop();
mikeb 3:ecfa4fa0b5a7 168
mikeb 3:ecfa4fa0b5a7 169 return (ack1+ack2+ack3)-3;
mikeb 3:ecfa4fa0b5a7 170 }
mikeb 3:ecfa4fa0b5a7 171
mikeb 3:ecfa4fa0b5a7 172
mikeb 3:ecfa4fa0b5a7 173 int Mpr121::writeMany(int start, unsigned char* dataSet, int length){
mikeb 3:ecfa4fa0b5a7 174 //Start the command
mikeb 3:ecfa4fa0b5a7 175 i2c->start();
mikeb 3:ecfa4fa0b5a7 176
mikeb 3:ecfa4fa0b5a7 177 // Address the target (Write mode)
mikeb 3:ecfa4fa0b5a7 178 int ack= i2c->write(address);
mikeb 3:ecfa4fa0b5a7 179 if(ack!=1){
mikeb 3:ecfa4fa0b5a7 180 return -1;
mikeb 3:ecfa4fa0b5a7 181 }
mikeb 3:ecfa4fa0b5a7 182
mikeb 3:ecfa4fa0b5a7 183 // Set the register key to write
mikeb 3:ecfa4fa0b5a7 184 ack = i2c->write(start);
mikeb 3:ecfa4fa0b5a7 185 if(ack!=1){
mikeb 3:ecfa4fa0b5a7 186 return -1;
mikeb 3:ecfa4fa0b5a7 187 }
mikeb 3:ecfa4fa0b5a7 188
mikeb 3:ecfa4fa0b5a7 189 // Write the date set
mikeb 3:ecfa4fa0b5a7 190 int count = 0;
mikeb 3:ecfa4fa0b5a7 191 while(ack==1 && (count < length)){
mikeb 3:ecfa4fa0b5a7 192 ack = i2c->write(dataSet[count]);
mikeb 3:ecfa4fa0b5a7 193 count++;
mikeb 3:ecfa4fa0b5a7 194 }
mikeb 3:ecfa4fa0b5a7 195 // Stop the cmd
mikeb 3:ecfa4fa0b5a7 196 i2c->stop();
mikeb 3:ecfa4fa0b5a7 197
mikeb 3:ecfa4fa0b5a7 198 return count;
mikeb 3:ecfa4fa0b5a7 199 }
mikeb 3:ecfa4fa0b5a7 200
mikeb 3:ecfa4fa0b5a7 201
mikeb 3:ecfa4fa0b5a7 202 bool Mpr121::getProximityMode(){
mikeb 3:ecfa4fa0b5a7 203 if(this->read(ELE_CFG) > 0x0c)
mikeb 3:ecfa4fa0b5a7 204 return true;
mikeb 3:ecfa4fa0b5a7 205 else
mikeb 3:ecfa4fa0b5a7 206 return false;
mikeb 3:ecfa4fa0b5a7 207 }
mikeb 3:ecfa4fa0b5a7 208
mikeb 3:ecfa4fa0b5a7 209 void Mpr121::setProximityMode(bool mode){
mikeb 3:ecfa4fa0b5a7 210 this->write(ELE_CFG,0x00);
mikeb 3:ecfa4fa0b5a7 211 if(mode){
mikeb 3:ecfa4fa0b5a7 212 this->write(ELE_CFG,0x30); //Sense proximity from ALL pads
mikeb 3:ecfa4fa0b5a7 213 } else {
mikeb 3:ecfa4fa0b5a7 214 this->write(ELE_CFG,0x0c); //Sense touch, all 12 pads active.
mikeb 3:ecfa4fa0b5a7 215 }
mikeb 3:ecfa4fa0b5a7 216 }
mikeb 3:ecfa4fa0b5a7 217
mikeb 3:ecfa4fa0b5a7 218
mikeb 3:ecfa4fa0b5a7 219 int Mpr121::readTouchData(){
mikeb 3:ecfa4fa0b5a7 220 return this->read(0x00);
mikeb 3:ecfa4fa0b5a7 221 }