Nakul Dureja / Mbed 2 deprecated Mbed_Text_Reader

Mbed_Text_Reader using an SDcard reader, 12-key touch pad and uLCD.

Dependencies:   FATFileSystem mbed-rtos mbed

mpr121.cpp@1:806d2fa3e155, 2014-03-24 (annotated)

Committer:
ndureja3
Date:
Mon Mar 24 06:48:12 2014 +0000
Revision:
1:806d2fa3e155
Parent:
0:6bd0fe190ecc 
24 Mar 2014

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ndureja3 0:6bd0fe190ecc 1 /*
ndureja3 0:6bd0fe190ecc 2 Copyright (c) 2011 Anthony Buckton (abuckton [at] blackink [dot} net {dot} au)
ndureja3 0:6bd0fe190ecc 3
ndureja3 0:6bd0fe190ecc 4 Permission is hereby granted, free of charge, to any person obtaining a copy
ndureja3 0:6bd0fe190ecc 5 of this software and associated documentation files (the "Software"), to deal
ndureja3 0:6bd0fe190ecc 6 in the Software without restriction, including without limitation the rights
ndureja3 0:6bd0fe190ecc 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
ndureja3 0:6bd0fe190ecc 8 copies of the Software, and to permit persons to whom the Software is
ndureja3 0:6bd0fe190ecc 9 furnished to do so, subject to the following conditions:
ndureja3 0:6bd0fe190ecc 10
ndureja3 0:6bd0fe190ecc 11 The above copyright notice and this permission notice shall be included in
ndureja3 0:6bd0fe190ecc 12 all copies or substantial portions of the Software.
ndureja3 0:6bd0fe190ecc 13
ndureja3 0:6bd0fe190ecc 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
ndureja3 0:6bd0fe190ecc 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
ndureja3 0:6bd0fe190ecc 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
ndureja3 0:6bd0fe190ecc 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
ndureja3 0:6bd0fe190ecc 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
ndureja3 0:6bd0fe190ecc 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
ndureja3 0:6bd0fe190ecc 20 THE SOFTWARE.
ndureja3 0:6bd0fe190ecc 21 */
ndureja3 0:6bd0fe190ecc 22
ndureja3 0:6bd0fe190ecc 23 #include <mbed.h>
ndureja3 0:6bd0fe190ecc 24 #include <sstream>
ndureja3 0:6bd0fe190ecc 25 #include <string>
ndureja3 0:6bd0fe190ecc 26 #include <list>
ndureja3 0:6bd0fe190ecc 27
ndureja3 0:6bd0fe190ecc 28 #include <mpr121.h>
ndureja3 0:6bd0fe190ecc 29
ndureja3 0:6bd0fe190ecc 30 Mpr121::Mpr121(I2C *i2c, Address i2cAddress)
ndureja3 0:6bd0fe190ecc 31 {
ndureja3 0:6bd0fe190ecc 32 this->i2c = i2c;
ndureja3 0:6bd0fe190ecc 33
ndureja3 0:6bd0fe190ecc 34 address = i2cAddress;
ndureja3 0:6bd0fe190ecc 35
ndureja3 0:6bd0fe190ecc 36 // Configure the MPR121 settings to default
ndureja3 0:6bd0fe190ecc 37 this->configureSettings();
ndureja3 0:6bd0fe190ecc 38 }
ndureja3 0:6bd0fe190ecc 39
ndureja3 0:6bd0fe190ecc 40
ndureja3 0:6bd0fe190ecc 41 void Mpr121::configureSettings()
ndureja3 0:6bd0fe190ecc 42 {
ndureja3 0:6bd0fe190ecc 43 // Put the MPR into setup mode
ndureja3 0:6bd0fe190ecc 44 this->write(ELE_CFG,0x00);
ndureja3 0:6bd0fe190ecc 45
ndureja3 0:6bd0fe190ecc 46 // Electrode filters for when data is > baseline
ndureja3 0:6bd0fe190ecc 47 unsigned char gtBaseline[] = {
ndureja3 0:6bd0fe190ecc 48 0x01, //MHD_R
ndureja3 0:6bd0fe190ecc 49 0x01, //NHD_R
ndureja3 0:6bd0fe190ecc 50 0x00, //NCL_R
ndureja3 0:6bd0fe190ecc 51 0x00 //FDL_R
ndureja3 0:6bd0fe190ecc 52 };
ndureja3 0:6bd0fe190ecc 53
ndureja3 0:6bd0fe190ecc 54 writeMany(MHD_R,gtBaseline,4);
ndureja3 0:6bd0fe190ecc 55
ndureja3 0:6bd0fe190ecc 56 // Electrode filters for when data is < baseline
ndureja3 0:6bd0fe190ecc 57 unsigned char ltBaseline[] = {
ndureja3 0:6bd0fe190ecc 58 0x01, //MHD_F
ndureja3 0:6bd0fe190ecc 59 0x01, //NHD_F
ndureja3 0:6bd0fe190ecc 60 0xFF, //NCL_F
ndureja3 0:6bd0fe190ecc 61 0x02 //FDL_F
ndureja3 0:6bd0fe190ecc 62 };
ndureja3 0:6bd0fe190ecc 63
ndureja3 0:6bd0fe190ecc 64 writeMany(MHD_F,ltBaseline,4);
ndureja3 0:6bd0fe190ecc 65
ndureja3 0:6bd0fe190ecc 66 // Electrode touch and release thresholds
ndureja3 0:6bd0fe190ecc 67 unsigned char electrodeThresholds[] = {
ndureja3 0:6bd0fe190ecc 68 E_THR_T, // Touch Threshhold
ndureja3 0:6bd0fe190ecc 69 E_THR_R // Release Threshold
ndureja3 0:6bd0fe190ecc 70 };
ndureja3 0:6bd0fe190ecc 71
ndureja3 0:6bd0fe190ecc 72 for(int i=0; i<12; i++){
ndureja3 0:6bd0fe190ecc 73 int result = writeMany((ELE0_T+(i*2)),electrodeThresholds,2);
ndureja3 0:6bd0fe190ecc 74 }
ndureja3 0:6bd0fe190ecc 75
ndureja3 0:6bd0fe190ecc 76 // Proximity Settings
ndureja3 0:6bd0fe190ecc 77 unsigned char proximitySettings[] = {
ndureja3 0:6bd0fe190ecc 78 0xff, //MHD_Prox_R
ndureja3 0:6bd0fe190ecc 79 0xff, //NHD_Prox_R
ndureja3 0:6bd0fe190ecc 80 0x00, //NCL_Prox_R
ndureja3 0:6bd0fe190ecc 81 0x00, //FDL_Prox_R
ndureja3 0:6bd0fe190ecc 82 0x01, //MHD_Prox_F
ndureja3 0:6bd0fe190ecc 83 0x01, //NHD_Prox_F
ndureja3 0:6bd0fe190ecc 84 0xFF, //NCL_Prox_F
ndureja3 0:6bd0fe190ecc 85 0xff, //FDL_Prox_F
ndureja3 0:6bd0fe190ecc 86 0x00, //NHD_Prox_T
ndureja3 0:6bd0fe190ecc 87 0x00, //NCL_Prox_T
ndureja3 0:6bd0fe190ecc 88 0x00 //NFD_Prox_T
ndureja3 0:6bd0fe190ecc 89 };
ndureja3 0:6bd0fe190ecc 90 writeMany(MHDPROXR,proximitySettings,11);
ndureja3 0:6bd0fe190ecc 91
ndureja3 0:6bd0fe190ecc 92 unsigned char proxThresh[] = {
ndureja3 0:6bd0fe190ecc 93 PROX_THR_T, // Touch Threshold
ndureja3 0:6bd0fe190ecc 94 PROX_THR_R // Release Threshold
ndureja3 0:6bd0fe190ecc 95 };
ndureja3 0:6bd0fe190ecc 96 writeMany(EPROXTTH,proxThresh,2);
ndureja3 0:6bd0fe190ecc 97
ndureja3 0:6bd0fe190ecc 98 this->write(FIL_CFG,0x04);
ndureja3 0:6bd0fe190ecc 99
ndureja3 0:6bd0fe190ecc 100 // Set the electrode config to transition to active mode
ndureja3 0:6bd0fe190ecc 101 this->write(ELE_CFG,0x0c);
ndureja3 0:6bd0fe190ecc 102 }
ndureja3 0:6bd0fe190ecc 103
ndureja3 0:6bd0fe190ecc 104 void Mpr121::setElectrodeThreshold(int electrode, unsigned char touch, unsigned char release){
ndureja3 0:6bd0fe190ecc 105
ndureja3 0:6bd0fe190ecc 106 if(electrode > 11) return;
ndureja3 0:6bd0fe190ecc 107
ndureja3 0:6bd0fe190ecc 108 // Get the current mode
ndureja3 0:6bd0fe190ecc 109 unsigned char mode = this->read(ELE_CFG);
ndureja3 0:6bd0fe190ecc 110
ndureja3 0:6bd0fe190ecc 111 // Put the MPR into setup mode
ndureja3 0:6bd0fe190ecc 112 this->write(ELE_CFG,0x00);
ndureja3 0:6bd0fe190ecc 113
ndureja3 0:6bd0fe190ecc 114 // Write the new threshold
ndureja3 0:6bd0fe190ecc 115 this->write((ELE0_T+(electrode*2)), touch);
ndureja3 0:6bd0fe190ecc 116 this->write((ELE0_T+(electrode*2)+1), release);
ndureja3 0:6bd0fe190ecc 117
ndureja3 0:6bd0fe190ecc 118 //Restore the operating mode
ndureja3 0:6bd0fe190ecc 119 this->write(ELE_CFG, mode);
ndureja3 0:6bd0fe190ecc 120 }
ndureja3 0:6bd0fe190ecc 121
ndureja3 0:6bd0fe190ecc 122
ndureja3 0:6bd0fe190ecc 123 unsigned char Mpr121::read(int key){
ndureja3 0:6bd0fe190ecc 124
ndureja3 0:6bd0fe190ecc 125 unsigned char data[2];
ndureja3 0:6bd0fe190ecc 126
ndureja3 0:6bd0fe190ecc 127 //Start the command
ndureja3 0:6bd0fe190ecc 128 i2c->start();
ndureja3 0:6bd0fe190ecc 129
ndureja3 0:6bd0fe190ecc 130 // Address the target (Write mode)
ndureja3 0:6bd0fe190ecc 131 int ack1= i2c->write(address);
ndureja3 0:6bd0fe190ecc 132
ndureja3 0:6bd0fe190ecc 133 // Set the register key to read
ndureja3 0:6bd0fe190ecc 134 int ack2 = i2c->write(key);
ndureja3 0:6bd0fe190ecc 135
ndureja3 0:6bd0fe190ecc 136 // Re-start for read of data
ndureja3 0:6bd0fe190ecc 137 i2c->start();
ndureja3 0:6bd0fe190ecc 138
ndureja3 0:6bd0fe190ecc 139 // Re-send the target address in read mode
ndureja3 0:6bd0fe190ecc 140 int ack3 = i2c->write(address+1);
ndureja3 0:6bd0fe190ecc 141
ndureja3 0:6bd0fe190ecc 142 // Read in the result
ndureja3 0:6bd0fe190ecc 143 data[0] = i2c->read(0);
ndureja3 0:6bd0fe190ecc 144
ndureja3 0:6bd0fe190ecc 145 // Reset the bus
ndureja3 0:6bd0fe190ecc 146 i2c->stop();
ndureja3 0:6bd0fe190ecc 147
ndureja3 0:6bd0fe190ecc 148 return data[0];
ndureja3 0:6bd0fe190ecc 149 }
ndureja3 0:6bd0fe190ecc 150
ndureja3 0:6bd0fe190ecc 151
ndureja3 0:6bd0fe190ecc 152 int Mpr121::write(int key, unsigned char value){
ndureja3 0:6bd0fe190ecc 153
ndureja3 0:6bd0fe190ecc 154 //Start the command
ndureja3 0:6bd0fe190ecc 155 i2c->start();
ndureja3 0:6bd0fe190ecc 156
ndureja3 0:6bd0fe190ecc 157 // Address the target (Write mode)
ndureja3 0:6bd0fe190ecc 158 int ack1= i2c->write(address);
ndureja3 0:6bd0fe190ecc 159
ndureja3 0:6bd0fe190ecc 160 // Set the register key to write
ndureja3 0:6bd0fe190ecc 161 int ack2 = i2c->write(key);
ndureja3 0:6bd0fe190ecc 162
ndureja3 0:6bd0fe190ecc 163 // Read in the result
ndureja3 0:6bd0fe190ecc 164 int ack3 = i2c->write(value);
ndureja3 0:6bd0fe190ecc 165
ndureja3 0:6bd0fe190ecc 166 // Reset the bus
ndureja3 0:6bd0fe190ecc 167 i2c->stop();
ndureja3 0:6bd0fe190ecc 168
ndureja3 0:6bd0fe190ecc 169 return (ack1+ack2+ack3)-3;
ndureja3 0:6bd0fe190ecc 170 }
ndureja3 0:6bd0fe190ecc 171
ndureja3 0:6bd0fe190ecc 172
ndureja3 0:6bd0fe190ecc 173 int Mpr121::writeMany(int start, unsigned char* dataSet, int length){
ndureja3 0:6bd0fe190ecc 174 //Start the command
ndureja3 0:6bd0fe190ecc 175 i2c->start();
ndureja3 0:6bd0fe190ecc 176
ndureja3 0:6bd0fe190ecc 177 // Address the target (Write mode)
ndureja3 0:6bd0fe190ecc 178 int ack= i2c->write(address);
ndureja3 0:6bd0fe190ecc 179 if(ack!=1){
ndureja3 0:6bd0fe190ecc 180 return -1;
ndureja3 0:6bd0fe190ecc 181 }
ndureja3 0:6bd0fe190ecc 182
ndureja3 0:6bd0fe190ecc 183 // Set the register key to write
ndureja3 0:6bd0fe190ecc 184 ack = i2c->write(start);
ndureja3 0:6bd0fe190ecc 185 if(ack!=1){
ndureja3 0:6bd0fe190ecc 186 return -1;
ndureja3 0:6bd0fe190ecc 187 }
ndureja3 0:6bd0fe190ecc 188
ndureja3 0:6bd0fe190ecc 189 // Write the date set
ndureja3 0:6bd0fe190ecc 190 int count = 0;
ndureja3 0:6bd0fe190ecc 191 while(ack==1 && (count < length)){
ndureja3 0:6bd0fe190ecc 192 ack = i2c->write(dataSet[count]);
ndureja3 0:6bd0fe190ecc 193 count++;
ndureja3 0:6bd0fe190ecc 194 }
ndureja3 0:6bd0fe190ecc 195 // Stop the cmd
ndureja3 0:6bd0fe190ecc 196 i2c->stop();
ndureja3 0:6bd0fe190ecc 197
ndureja3 0:6bd0fe190ecc 198 return count;
ndureja3 0:6bd0fe190ecc 199 }
ndureja3 0:6bd0fe190ecc 200
ndureja3 0:6bd0fe190ecc 201
ndureja3 0:6bd0fe190ecc 202 bool Mpr121::getProximityMode(){
ndureja3 0:6bd0fe190ecc 203 if(this->read(ELE_CFG) > 0x0c)
ndureja3 0:6bd0fe190ecc 204 return true;
ndureja3 0:6bd0fe190ecc 205 else
ndureja3 0:6bd0fe190ecc 206 return false;
ndureja3 0:6bd0fe190ecc 207 }
ndureja3 0:6bd0fe190ecc 208
ndureja3 0:6bd0fe190ecc 209 void Mpr121::setProximityMode(bool mode){
ndureja3 0:6bd0fe190ecc 210 this->write(ELE_CFG,0x00);
ndureja3 0:6bd0fe190ecc 211 if(mode){
ndureja3 0:6bd0fe190ecc 212 this->write(ELE_CFG,0x30); //Sense proximity from ALL pads
ndureja3 0:6bd0fe190ecc 213 } else {
ndureja3 0:6bd0fe190ecc 214 this->write(ELE_CFG,0x0c); //Sense touch, all 12 pads active.
ndureja3 0:6bd0fe190ecc 215 }
ndureja3 0:6bd0fe190ecc 216 }
ndureja3 0:6bd0fe190ecc 217
ndureja3 0:6bd0fe190ecc 218
ndureja3 0:6bd0fe190ecc 219 int Mpr121::readTouchData(){
ndureja3 0:6bd0fe190ecc 220 return this->read(0x00);
ndureja3 0:6bd0fe190ecc 221 }