Martin Sturm / Mbed 2 deprecated Lab3

Dependencies:   mbed

MPR121/mpr121.cpp@0:c546b51ecf0b, 2011-10-11 (annotated)

Committer:
XkLi
Date:
Tue Oct 11 01:24:18 2011 +0000
Revision:
0:c546b51ecf0b
v1.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
XkLi 0:c546b51ecf0b 1 /*
XkLi 0:c546b51ecf0b 2 Copyright (c) 2011 Anthony Buckton (abuckton [at] blackink [dot} net {dot} au)
XkLi 0:c546b51ecf0b 3
XkLi 0:c546b51ecf0b 4 Permission is hereby granted, free of charge, to any person obtaining a copy
XkLi 0:c546b51ecf0b 5 of this software and associated documentation files (the "Software"), to deal
XkLi 0:c546b51ecf0b 6 in the Software without restriction, including without limitation the rights
XkLi 0:c546b51ecf0b 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
XkLi 0:c546b51ecf0b 8 copies of the Software, and to permit persons to whom the Software is
XkLi 0:c546b51ecf0b 9 furnished to do so, subject to the following conditions:
XkLi 0:c546b51ecf0b 10
XkLi 0:c546b51ecf0b 11 The above copyright notice and this permission notice shall be included in
XkLi 0:c546b51ecf0b 12 all copies or substantial portions of the Software.
XkLi 0:c546b51ecf0b 13
XkLi 0:c546b51ecf0b 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
XkLi 0:c546b51ecf0b 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
XkLi 0:c546b51ecf0b 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
XkLi 0:c546b51ecf0b 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
XkLi 0:c546b51ecf0b 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
XkLi 0:c546b51ecf0b 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
XkLi 0:c546b51ecf0b 20 THE SOFTWARE.
XkLi 0:c546b51ecf0b 21 */
XkLi 0:c546b51ecf0b 22
XkLi 0:c546b51ecf0b 23 #include <mbed.h>
XkLi 0:c546b51ecf0b 24 #include <sstream>
XkLi 0:c546b51ecf0b 25 #include <string>
XkLi 0:c546b51ecf0b 26 #include <list>
XkLi 0:c546b51ecf0b 27
XkLi 0:c546b51ecf0b 28 #include <mpr121.h>
XkLi 0:c546b51ecf0b 29
XkLi 0:c546b51ecf0b 30 Mpr121::Mpr121(I2C *i2c, Address i2cAddress)
XkLi 0:c546b51ecf0b 31 {
XkLi 0:c546b51ecf0b 32 this->i2c = i2c;
XkLi 0:c546b51ecf0b 33
XkLi 0:c546b51ecf0b 34 address = i2cAddress;
XkLi 0:c546b51ecf0b 35
XkLi 0:c546b51ecf0b 36 // Configure the MPR121 settings to default
XkLi 0:c546b51ecf0b 37
XkLi 0:c546b51ecf0b 38 this->configureSettings();
XkLi 0:c546b51ecf0b 39 }
XkLi 0:c546b51ecf0b 40
XkLi 0:c546b51ecf0b 41
XkLi 0:c546b51ecf0b 42 void Mpr121::configureSettings()
XkLi 0:c546b51ecf0b 43 {
XkLi 0:c546b51ecf0b 44 // Put the MPR into setup mode
XkLi 0:c546b51ecf0b 45 this->write(ELE_CFG,0x00);
XkLi 0:c546b51ecf0b 46
XkLi 0:c546b51ecf0b 47 // Electrode filters for when data is > baseline
XkLi 0:c546b51ecf0b 48 unsigned char gtBaseline[] = {
XkLi 0:c546b51ecf0b 49 0x01, //MHD_R
XkLi 0:c546b51ecf0b 50 0x01, //NHD_R
XkLi 0:c546b51ecf0b 51 0x00, //NCL_R
XkLi 0:c546b51ecf0b 52 0x00 //FDL_R
XkLi 0:c546b51ecf0b 53 };
XkLi 0:c546b51ecf0b 54
XkLi 0:c546b51ecf0b 55 writeMany(MHD_R,gtBaseline,4);
XkLi 0:c546b51ecf0b 56
XkLi 0:c546b51ecf0b 57 // Electrode filters for when data is < baseline
XkLi 0:c546b51ecf0b 58 unsigned char ltBaseline[] = {
XkLi 0:c546b51ecf0b 59 0x01, //MHD_F
XkLi 0:c546b51ecf0b 60 0x01, //NHD_F
XkLi 0:c546b51ecf0b 61 0xFF, //NCL_F
XkLi 0:c546b51ecf0b 62 0x02 //FDL_F
XkLi 0:c546b51ecf0b 63 };
XkLi 0:c546b51ecf0b 64
XkLi 0:c546b51ecf0b 65 writeMany(MHD_F,ltBaseline,4);
XkLi 0:c546b51ecf0b 66
XkLi 0:c546b51ecf0b 67 // Electrode touch and release thresholds
XkLi 0:c546b51ecf0b 68 unsigned char electrodeThresholds[] = {
XkLi 0:c546b51ecf0b 69 E_THR_T, // Touch Threshhold
XkLi 0:c546b51ecf0b 70 E_THR_R // Release Threshold
XkLi 0:c546b51ecf0b 71 };
XkLi 0:c546b51ecf0b 72
XkLi 0:c546b51ecf0b 73 for(int i=0; i<12; i++){
XkLi 0:c546b51ecf0b 74 int result = writeMany((ELE0_T+(i*2)),electrodeThresholds,2);
XkLi 0:c546b51ecf0b 75 }
XkLi 0:c546b51ecf0b 76
XkLi 0:c546b51ecf0b 77 // Proximity Settings
XkLi 0:c546b51ecf0b 78 unsigned char proximitySettings[] = {
XkLi 0:c546b51ecf0b 79 0xff, //MHD_Prox_R
XkLi 0:c546b51ecf0b 80 0xff, //NHD_Prox_R
XkLi 0:c546b51ecf0b 81 0x00, //NCL_Prox_R
XkLi 0:c546b51ecf0b 82 0x00, //FDL_Prox_R
XkLi 0:c546b51ecf0b 83 0x01, //MHD_Prox_F
XkLi 0:c546b51ecf0b 84 0x01, //NHD_Prox_F
XkLi 0:c546b51ecf0b 85 0xFF, //NCL_Prox_F
XkLi 0:c546b51ecf0b 86 0xff, //FDL_Prox_F
XkLi 0:c546b51ecf0b 87 0x00, //NHD_Prox_T
XkLi 0:c546b51ecf0b 88 0x00, //NCL_Prox_T
XkLi 0:c546b51ecf0b 89 0x00 //NFD_Prox_T
XkLi 0:c546b51ecf0b 90 };
XkLi 0:c546b51ecf0b 91 writeMany(MHDPROXR,proximitySettings,11);
XkLi 0:c546b51ecf0b 92
XkLi 0:c546b51ecf0b 93 unsigned char proxThresh[] = {
XkLi 0:c546b51ecf0b 94 PROX_THR_T, // Touch Threshold
XkLi 0:c546b51ecf0b 95 PROX_THR_R // Release Threshold
XkLi 0:c546b51ecf0b 96 };
XkLi 0:c546b51ecf0b 97 writeMany(EPROXTTH,proxThresh,2);
XkLi 0:c546b51ecf0b 98
XkLi 0:c546b51ecf0b 99 this->write(FIL_CFG,0x04);
XkLi 0:c546b51ecf0b 100
XkLi 0:c546b51ecf0b 101 // Set the electrode config to transition to active mode
XkLi 0:c546b51ecf0b 102 this->write(ELE_CFG,0x0c);
XkLi 0:c546b51ecf0b 103 }
XkLi 0:c546b51ecf0b 104
XkLi 0:c546b51ecf0b 105 void Mpr121::setElectrodeThreshold(int electrode, unsigned char touch, unsigned char release){
XkLi 0:c546b51ecf0b 106
XkLi 0:c546b51ecf0b 107 if(electrode > 11) return;
XkLi 0:c546b51ecf0b 108
XkLi 0:c546b51ecf0b 109 // Get the current mode
XkLi 0:c546b51ecf0b 110 unsigned char mode = this->read(ELE_CFG);
XkLi 0:c546b51ecf0b 111
XkLi 0:c546b51ecf0b 112 // Put the MPR into setup mode
XkLi 0:c546b51ecf0b 113 this->write(ELE_CFG,0x00);
XkLi 0:c546b51ecf0b 114
XkLi 0:c546b51ecf0b 115 // Write the new threshold
XkLi 0:c546b51ecf0b 116 this->write((ELE0_T+(electrode*2)), touch);
XkLi 0:c546b51ecf0b 117 this->write((ELE0_T+(electrode*2)+1), release);
XkLi 0:c546b51ecf0b 118
XkLi 0:c546b51ecf0b 119 //Restore the operating mode
XkLi 0:c546b51ecf0b 120 this->write(ELE_CFG, mode);
XkLi 0:c546b51ecf0b 121 }
XkLi 0:c546b51ecf0b 122
XkLi 0:c546b51ecf0b 123
XkLi 0:c546b51ecf0b 124 unsigned char Mpr121::read(int key){
XkLi 0:c546b51ecf0b 125
XkLi 0:c546b51ecf0b 126 unsigned char data[2];
XkLi 0:c546b51ecf0b 127
XkLi 0:c546b51ecf0b 128 //Start the command
XkLi 0:c546b51ecf0b 129 i2c->start();
XkLi 0:c546b51ecf0b 130
XkLi 0:c546b51ecf0b 131 // Address the target (Write mode)
XkLi 0:c546b51ecf0b 132 int ack1= i2c->write(address);
XkLi 0:c546b51ecf0b 133
XkLi 0:c546b51ecf0b 134 // Set the register key to read
XkLi 0:c546b51ecf0b 135 int ack2 = i2c->write(key);
XkLi 0:c546b51ecf0b 136
XkLi 0:c546b51ecf0b 137 // Re-start for read of data
XkLi 0:c546b51ecf0b 138 i2c->start();
XkLi 0:c546b51ecf0b 139
XkLi 0:c546b51ecf0b 140 // Re-send the target address in read mode
XkLi 0:c546b51ecf0b 141 int ack3 = i2c->write(address+1);
XkLi 0:c546b51ecf0b 142
XkLi 0:c546b51ecf0b 143 // Read in the result
XkLi 0:c546b51ecf0b 144 data[0] = i2c->read(0);
XkLi 0:c546b51ecf0b 145
XkLi 0:c546b51ecf0b 146 // Reset the bus
XkLi 0:c546b51ecf0b 147 i2c->stop();
XkLi 0:c546b51ecf0b 148
XkLi 0:c546b51ecf0b 149 return data[0];
XkLi 0:c546b51ecf0b 150 }
XkLi 0:c546b51ecf0b 151
XkLi 0:c546b51ecf0b 152
XkLi 0:c546b51ecf0b 153 int Mpr121::write(int key, unsigned char value){
XkLi 0:c546b51ecf0b 154
XkLi 0:c546b51ecf0b 155 //Start the command
XkLi 0:c546b51ecf0b 156 i2c->start();
XkLi 0:c546b51ecf0b 157
XkLi 0:c546b51ecf0b 158 // Address the target (Write mode)
XkLi 0:c546b51ecf0b 159 int ack1= i2c->write(address);
XkLi 0:c546b51ecf0b 160
XkLi 0:c546b51ecf0b 161 // Set the register key to write
XkLi 0:c546b51ecf0b 162 int ack2 = i2c->write(key);
XkLi 0:c546b51ecf0b 163
XkLi 0:c546b51ecf0b 164 // Read in the result
XkLi 0:c546b51ecf0b 165 int ack3 = i2c->write(value);
XkLi 0:c546b51ecf0b 166
XkLi 0:c546b51ecf0b 167 // Reset the bus
XkLi 0:c546b51ecf0b 168 i2c->stop();
XkLi 0:c546b51ecf0b 169
XkLi 0:c546b51ecf0b 170 return (ack1+ack2+ack3)-3;
XkLi 0:c546b51ecf0b 171 }
XkLi 0:c546b51ecf0b 172
XkLi 0:c546b51ecf0b 173
XkLi 0:c546b51ecf0b 174 int Mpr121::writeMany(int start, unsigned char* dataSet, int length){
XkLi 0:c546b51ecf0b 175 //Start the command
XkLi 0:c546b51ecf0b 176 i2c->start();
XkLi 0:c546b51ecf0b 177
XkLi 0:c546b51ecf0b 178 // Address the target (Write mode)
XkLi 0:c546b51ecf0b 179 int ack= i2c->write(address);
XkLi 0:c546b51ecf0b 180 if(ack!=1){
XkLi 0:c546b51ecf0b 181 return -1;
XkLi 0:c546b51ecf0b 182 }
XkLi 0:c546b51ecf0b 183
XkLi 0:c546b51ecf0b 184 // Set the register key to write
XkLi 0:c546b51ecf0b 185 ack = i2c->write(start);
XkLi 0:c546b51ecf0b 186 if(ack!=1){
XkLi 0:c546b51ecf0b 187 return -1;
XkLi 0:c546b51ecf0b 188 }
XkLi 0:c546b51ecf0b 189
XkLi 0:c546b51ecf0b 190 // Write the date set
XkLi 0:c546b51ecf0b 191 int count = 0;
XkLi 0:c546b51ecf0b 192 while(ack==1 && (count < length)){
XkLi 0:c546b51ecf0b 193 ack = i2c->write(dataSet[count]);
XkLi 0:c546b51ecf0b 194 count++;
XkLi 0:c546b51ecf0b 195 }
XkLi 0:c546b51ecf0b 196 // Stop the cmd
XkLi 0:c546b51ecf0b 197 i2c->stop();
XkLi 0:c546b51ecf0b 198
XkLi 0:c546b51ecf0b 199 return count;
XkLi 0:c546b51ecf0b 200 }
XkLi 0:c546b51ecf0b 201
XkLi 0:c546b51ecf0b 202
XkLi 0:c546b51ecf0b 203 bool Mpr121::getProximityMode(){
XkLi 0:c546b51ecf0b 204 if(this->read(ELE_CFG) > 0x0c)
XkLi 0:c546b51ecf0b 205 return true;
XkLi 0:c546b51ecf0b 206 else
XkLi 0:c546b51ecf0b 207 return false;
XkLi 0:c546b51ecf0b 208 }
XkLi 0:c546b51ecf0b 209
XkLi 0:c546b51ecf0b 210 void Mpr121::setProximityMode(bool mode){
XkLi 0:c546b51ecf0b 211 this->write(ELE_CFG,0x00);
XkLi 0:c546b51ecf0b 212 if(mode){
XkLi 0:c546b51ecf0b 213 this->write(ELE_CFG,0x30); //Sense proximity from ALL pads
XkLi 0:c546b51ecf0b 214 } else {
XkLi 0:c546b51ecf0b 215 this->write(ELE_CFG,0x0c); //Sense touch, all 12 pads active.
XkLi 0:c546b51ecf0b 216 }
XkLi 0:c546b51ecf0b 217 }
XkLi 0:c546b51ecf0b 218
XkLi 0:c546b51ecf0b 219
XkLi 0:c546b51ecf0b 220 int Mpr121::readTouchData(){
XkLi 0:c546b51ecf0b 221 return this->read(0x00);
XkLi 0:c546b51ecf0b 222 }