Rahul Maran / Mbed 2 deprecated 4180Lab_4

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Dependencies:   4DGL-uLCD-SE LSM9DS1_Library_cal SDFileSystem mbed-rtos mbed wave_player

mpr121.cpp@0:2b0c527942db, 2016-11-02 (annotated)

Committer:
rmaran6
Date:
Wed Nov 02 02:02:03 2016 +0000
Revision:
0:2b0c527942db
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Who changed what in which revision?

UserRevisionLine numberNew contents of line
rmaran6 0:2b0c527942db 1 /*
rmaran6 0:2b0c527942db 2 Copyright (c) 2011 Anthony Buckton (abuckton [at] blackink [dot} net {dot} au)
rmaran6 0:2b0c527942db 3
rmaran6 0:2b0c527942db 4 Permission is hereby granted, free of charge, to any person obtaining a copy
rmaran6 0:2b0c527942db 5 of this software and associated documentation files (the "Software"), to deal
rmaran6 0:2b0c527942db 6 in the Software without restriction, including without limitation the rights
rmaran6 0:2b0c527942db 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
rmaran6 0:2b0c527942db 8 copies of the Software, and to permit persons to whom the Software is
rmaran6 0:2b0c527942db 9 furnished to do so, subject to the following conditions:
rmaran6 0:2b0c527942db 10
rmaran6 0:2b0c527942db 11 The above copyright notice and this permission notice shall be included in
rmaran6 0:2b0c527942db 12 all copies or substantial portions of the Software.
rmaran6 0:2b0c527942db 13
rmaran6 0:2b0c527942db 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
rmaran6 0:2b0c527942db 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
rmaran6 0:2b0c527942db 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
rmaran6 0:2b0c527942db 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
rmaran6 0:2b0c527942db 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
rmaran6 0:2b0c527942db 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
rmaran6 0:2b0c527942db 20 THE SOFTWARE.
rmaran6 0:2b0c527942db 21 */
rmaran6 0:2b0c527942db 22
rmaran6 0:2b0c527942db 23 #include <mbed.h>
rmaran6 0:2b0c527942db 24 #include <sstream>
rmaran6 0:2b0c527942db 25 #include <string>
rmaran6 0:2b0c527942db 26 #include <list>
rmaran6 0:2b0c527942db 27
rmaran6 0:2b0c527942db 28 #include <mpr121.h>
rmaran6 0:2b0c527942db 29
rmaran6 0:2b0c527942db 30 Mpr121::Mpr121(I2C *i2c, Address i2cAddress)
rmaran6 0:2b0c527942db 31 {
rmaran6 0:2b0c527942db 32 this->i2c = i2c;
rmaran6 0:2b0c527942db 33
rmaran6 0:2b0c527942db 34 address = i2cAddress;
rmaran6 0:2b0c527942db 35
rmaran6 0:2b0c527942db 36 // Configure the MPR121 settings to default
rmaran6 0:2b0c527942db 37 this->configureSettings();
rmaran6 0:2b0c527942db 38 }
rmaran6 0:2b0c527942db 39
rmaran6 0:2b0c527942db 40
rmaran6 0:2b0c527942db 41 void Mpr121::configureSettings()
rmaran6 0:2b0c527942db 42 {
rmaran6 0:2b0c527942db 43 // Put the MPR into setup mode
rmaran6 0:2b0c527942db 44 this->write(ELE_CFG,0x00);
rmaran6 0:2b0c527942db 45
rmaran6 0:2b0c527942db 46 // Electrode filters for when data is > baseline
rmaran6 0:2b0c527942db 47 unsigned char gtBaseline[] = {
rmaran6 0:2b0c527942db 48 0x01, //MHD_R
rmaran6 0:2b0c527942db 49 0x01, //NHD_R
rmaran6 0:2b0c527942db 50 0x00, //NCL_R
rmaran6 0:2b0c527942db 51 0x00 //FDL_R
rmaran6 0:2b0c527942db 52 };
rmaran6 0:2b0c527942db 53
rmaran6 0:2b0c527942db 54 writeMany(MHD_R,gtBaseline,4);
rmaran6 0:2b0c527942db 55
rmaran6 0:2b0c527942db 56 // Electrode filters for when data is < baseline
rmaran6 0:2b0c527942db 57 unsigned char ltBaseline[] = {
rmaran6 0:2b0c527942db 58 0x01, //MHD_F
rmaran6 0:2b0c527942db 59 0x01, //NHD_F
rmaran6 0:2b0c527942db 60 0xFF, //NCL_F
rmaran6 0:2b0c527942db 61 0x02 //FDL_F
rmaran6 0:2b0c527942db 62 };
rmaran6 0:2b0c527942db 63
rmaran6 0:2b0c527942db 64 writeMany(MHD_F,ltBaseline,4);
rmaran6 0:2b0c527942db 65
rmaran6 0:2b0c527942db 66 // Electrode touch and release thresholds
rmaran6 0:2b0c527942db 67 unsigned char electrodeThresholds[] = {
rmaran6 0:2b0c527942db 68 E_THR_T, // Touch Threshhold
rmaran6 0:2b0c527942db 69 E_THR_R // Release Threshold
rmaran6 0:2b0c527942db 70 };
rmaran6 0:2b0c527942db 71
rmaran6 0:2b0c527942db 72 for(int i=0; i<12; i++){
rmaran6 0:2b0c527942db 73 int result = writeMany((ELE0_T+(i*2)),electrodeThresholds,2);
rmaran6 0:2b0c527942db 74 }
rmaran6 0:2b0c527942db 75
rmaran6 0:2b0c527942db 76 // Proximity Settings
rmaran6 0:2b0c527942db 77 unsigned char proximitySettings[] = {
rmaran6 0:2b0c527942db 78 0xff, //MHD_Prox_R
rmaran6 0:2b0c527942db 79 0xff, //NHD_Prox_R
rmaran6 0:2b0c527942db 80 0x00, //NCL_Prox_R
rmaran6 0:2b0c527942db 81 0x00, //FDL_Prox_R
rmaran6 0:2b0c527942db 82 0x01, //MHD_Prox_F
rmaran6 0:2b0c527942db 83 0x01, //NHD_Prox_F
rmaran6 0:2b0c527942db 84 0xFF, //NCL_Prox_F
rmaran6 0:2b0c527942db 85 0xff, //FDL_Prox_F
rmaran6 0:2b0c527942db 86 0x00, //NHD_Prox_T
rmaran6 0:2b0c527942db 87 0x00, //NCL_Prox_T
rmaran6 0:2b0c527942db 88 0x00 //NFD_Prox_T
rmaran6 0:2b0c527942db 89 };
rmaran6 0:2b0c527942db 90 writeMany(MHDPROXR,proximitySettings,11);
rmaran6 0:2b0c527942db 91
rmaran6 0:2b0c527942db 92 unsigned char proxThresh[] = {
rmaran6 0:2b0c527942db 93 PROX_THR_T, // Touch Threshold
rmaran6 0:2b0c527942db 94 PROX_THR_R // Release Threshold
rmaran6 0:2b0c527942db 95 };
rmaran6 0:2b0c527942db 96 writeMany(EPROXTTH,proxThresh,2);
rmaran6 0:2b0c527942db 97
rmaran6 0:2b0c527942db 98 this->write(FIL_CFG,0x04);
rmaran6 0:2b0c527942db 99
rmaran6 0:2b0c527942db 100 // Set the electrode config to transition to active mode
rmaran6 0:2b0c527942db 101 this->write(ELE_CFG,0x0c);
rmaran6 0:2b0c527942db 102 }
rmaran6 0:2b0c527942db 103
rmaran6 0:2b0c527942db 104 void Mpr121::setElectrodeThreshold(int electrode, unsigned char touch, unsigned char release){
rmaran6 0:2b0c527942db 105
rmaran6 0:2b0c527942db 106 if(electrode > 11) return;
rmaran6 0:2b0c527942db 107
rmaran6 0:2b0c527942db 108 // Get the current mode
rmaran6 0:2b0c527942db 109 unsigned char mode = this->read(ELE_CFG);
rmaran6 0:2b0c527942db 110
rmaran6 0:2b0c527942db 111 // Put the MPR into setup mode
rmaran6 0:2b0c527942db 112 this->write(ELE_CFG,0x00);
rmaran6 0:2b0c527942db 113
rmaran6 0:2b0c527942db 114 // Write the new threshold
rmaran6 0:2b0c527942db 115 this->write((ELE0_T+(electrode*2)), touch);
rmaran6 0:2b0c527942db 116 this->write((ELE0_T+(electrode*2)+1), release);
rmaran6 0:2b0c527942db 117
rmaran6 0:2b0c527942db 118 //Restore the operating mode
rmaran6 0:2b0c527942db 119 this->write(ELE_CFG, mode);
rmaran6 0:2b0c527942db 120 }
rmaran6 0:2b0c527942db 121
rmaran6 0:2b0c527942db 122
rmaran6 0:2b0c527942db 123 unsigned char Mpr121::read(int key){
rmaran6 0:2b0c527942db 124
rmaran6 0:2b0c527942db 125 unsigned char data[2];
rmaran6 0:2b0c527942db 126
rmaran6 0:2b0c527942db 127 //Start the command
rmaran6 0:2b0c527942db 128 i2c->start();
rmaran6 0:2b0c527942db 129
rmaran6 0:2b0c527942db 130 // Address the target (Write mode)
rmaran6 0:2b0c527942db 131 int ack1= i2c->write(address);
rmaran6 0:2b0c527942db 132
rmaran6 0:2b0c527942db 133 // Set the register key to read
rmaran6 0:2b0c527942db 134 int ack2 = i2c->write(key);
rmaran6 0:2b0c527942db 135
rmaran6 0:2b0c527942db 136 // Re-start for read of data
rmaran6 0:2b0c527942db 137 i2c->start();
rmaran6 0:2b0c527942db 138
rmaran6 0:2b0c527942db 139 // Re-send the target address in read mode
rmaran6 0:2b0c527942db 140 int ack3 = i2c->write(address+1);
rmaran6 0:2b0c527942db 141
rmaran6 0:2b0c527942db 142 // Read in the result
rmaran6 0:2b0c527942db 143 data[0] = i2c->read(0);
rmaran6 0:2b0c527942db 144
rmaran6 0:2b0c527942db 145 // Reset the bus
rmaran6 0:2b0c527942db 146 i2c->stop();
rmaran6 0:2b0c527942db 147
rmaran6 0:2b0c527942db 148 return data[0];
rmaran6 0:2b0c527942db 149 }
rmaran6 0:2b0c527942db 150
rmaran6 0:2b0c527942db 151
rmaran6 0:2b0c527942db 152 int Mpr121::write(int key, unsigned char value){
rmaran6 0:2b0c527942db 153
rmaran6 0:2b0c527942db 154 //Start the command
rmaran6 0:2b0c527942db 155 i2c->start();
rmaran6 0:2b0c527942db 156
rmaran6 0:2b0c527942db 157 // Address the target (Write mode)
rmaran6 0:2b0c527942db 158 int ack1= i2c->write(address);
rmaran6 0:2b0c527942db 159
rmaran6 0:2b0c527942db 160 // Set the register key to write
rmaran6 0:2b0c527942db 161 int ack2 = i2c->write(key);
rmaran6 0:2b0c527942db 162
rmaran6 0:2b0c527942db 163 // Read in the result
rmaran6 0:2b0c527942db 164 int ack3 = i2c->write(value);
rmaran6 0:2b0c527942db 165
rmaran6 0:2b0c527942db 166 // Reset the bus
rmaran6 0:2b0c527942db 167 i2c->stop();
rmaran6 0:2b0c527942db 168
rmaran6 0:2b0c527942db 169 return (ack1+ack2+ack3)-3;
rmaran6 0:2b0c527942db 170 }
rmaran6 0:2b0c527942db 171
rmaran6 0:2b0c527942db 172
rmaran6 0:2b0c527942db 173 int Mpr121::writeMany(int start, unsigned char* dataSet, int length){
rmaran6 0:2b0c527942db 174 //Start the command
rmaran6 0:2b0c527942db 175 i2c->start();
rmaran6 0:2b0c527942db 176
rmaran6 0:2b0c527942db 177 // Address the target (Write mode)
rmaran6 0:2b0c527942db 178 int ack= i2c->write(address);
rmaran6 0:2b0c527942db 179 if(ack!=1){
rmaran6 0:2b0c527942db 180 return -1;
rmaran6 0:2b0c527942db 181 }
rmaran6 0:2b0c527942db 182
rmaran6 0:2b0c527942db 183 // Set the register key to write
rmaran6 0:2b0c527942db 184 ack = i2c->write(start);
rmaran6 0:2b0c527942db 185 if(ack!=1){
rmaran6 0:2b0c527942db 186 return -1;
rmaran6 0:2b0c527942db 187 }
rmaran6 0:2b0c527942db 188
rmaran6 0:2b0c527942db 189 // Write the date set
rmaran6 0:2b0c527942db 190 int count = 0;
rmaran6 0:2b0c527942db 191 while(ack==1 && (count < length)){
rmaran6 0:2b0c527942db 192 ack = i2c->write(dataSet[count]);
rmaran6 0:2b0c527942db 193 count++;
rmaran6 0:2b0c527942db 194 }
rmaran6 0:2b0c527942db 195 // Stop the cmd
rmaran6 0:2b0c527942db 196 i2c->stop();
rmaran6 0:2b0c527942db 197
rmaran6 0:2b0c527942db 198 return count;
rmaran6 0:2b0c527942db 199 }
rmaran6 0:2b0c527942db 200
rmaran6 0:2b0c527942db 201
rmaran6 0:2b0c527942db 202 bool Mpr121::getProximityMode(){
rmaran6 0:2b0c527942db 203 if(this->read(ELE_CFG) > 0x0c)
rmaran6 0:2b0c527942db 204 return true;
rmaran6 0:2b0c527942db 205 else
rmaran6 0:2b0c527942db 206 return false;
rmaran6 0:2b0c527942db 207 }
rmaran6 0:2b0c527942db 208
rmaran6 0:2b0c527942db 209 void Mpr121::setProximityMode(bool mode){
rmaran6 0:2b0c527942db 210 this->write(ELE_CFG,0x00);
rmaran6 0:2b0c527942db 211 if(mode){
rmaran6 0:2b0c527942db 212 this->write(ELE_CFG,0x30); //Sense proximity from ALL pads
rmaran6 0:2b0c527942db 213 } else {
rmaran6 0:2b0c527942db 214 this->write(ELE_CFG,0x0c); //Sense touch, all 12 pads active.
rmaran6 0:2b0c527942db 215 }
rmaran6 0:2b0c527942db 216 }
rmaran6 0:2b0c527942db 217
rmaran6 0:2b0c527942db 218
rmaran6 0:2b0c527942db 219 int Mpr121::readTouchData(){
rmaran6 0:2b0c527942db 220 return this->read(0x00);
rmaran6 0:2b0c527942db 221 }