Karl Nicolaus / Mbed 2 deprecated 4180_Lab1_P6

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Dependencies:   mbed

mpr121.cpp@1:d1837531c318, 2011-02-28 (annotated)

Committer:
abuckton
Date:
Mon Feb 28 12:20:18 2011 +0000
Revision:
1:d1837531c318
Parent:
0:2e5b82508aea 
Cleaned up copyright, attributed original source

Who changed what in which revision?

UserRevisionLine numberNew contents of line
abuckton 1:d1837531c318 1 /*
abuckton 1:d1837531c318 2 Copyright (c) 2011 Anthony Buckton (abuckton [at] blackink [dot} net {dot} au)
abuckton 1:d1837531c318 3
abuckton 1:d1837531c318 4 Permission is hereby granted, free of charge, to any person obtaining a copy
abuckton 1:d1837531c318 5 of this software and associated documentation files (the "Software"), to deal
abuckton 1:d1837531c318 6 in the Software without restriction, including without limitation the rights
abuckton 1:d1837531c318 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
abuckton 1:d1837531c318 8 copies of the Software, and to permit persons to whom the Software is
abuckton 1:d1837531c318 9 furnished to do so, subject to the following conditions:
abuckton 1:d1837531c318 10
abuckton 1:d1837531c318 11 The above copyright notice and this permission notice shall be included in
abuckton 1:d1837531c318 12 all copies or substantial portions of the Software.
abuckton 1:d1837531c318 13
abuckton 1:d1837531c318 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
abuckton 1:d1837531c318 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
abuckton 1:d1837531c318 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
abuckton 1:d1837531c318 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
abuckton 1:d1837531c318 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
abuckton 1:d1837531c318 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
abuckton 1:d1837531c318 20 THE SOFTWARE.
abuckton 1:d1837531c318 21 */
abuckton 1:d1837531c318 22
abuckton 0:2e5b82508aea 23 #include <mbed.h>
abuckton 0:2e5b82508aea 24 #include <sstream>
abuckton 0:2e5b82508aea 25 #include <string>
abuckton 0:2e5b82508aea 26 #include <list>
abuckton 0:2e5b82508aea 27
abuckton 0:2e5b82508aea 28 #include <mpr121.h>
abuckton 1:d1837531c318 29
abuckton 1:d1837531c318 30 Mpr121::Mpr121(I2C *i2c, Address i2cAddress)
abuckton 1:d1837531c318 31 {
abuckton 1:d1837531c318 32 this->i2c = i2c;
abuckton 1:d1837531c318 33
abuckton 1:d1837531c318 34 address = i2cAddress;
abuckton 1:d1837531c318 35
abuckton 1:d1837531c318 36 // Configure the MPR121 settings to default
abuckton 1:d1837531c318 37 this->configureSettings();
abuckton 1:d1837531c318 38 }
abuckton 0:2e5b82508aea 39
abuckton 1:d1837531c318 40
abuckton 1:d1837531c318 41 void Mpr121::configureSettings()
abuckton 1:d1837531c318 42 {
abuckton 1:d1837531c318 43 // Put the MPR into setup mode
abuckton 1:d1837531c318 44 this->write(ELE_CFG,0x00);
abuckton 0:2e5b82508aea 45
abuckton 1:d1837531c318 46 // Electrode filters for when data is > baseline
abuckton 1:d1837531c318 47 unsigned char gtBaseline[] = {
abuckton 1:d1837531c318 48 0x01, //MHD_R
abuckton 1:d1837531c318 49 0x01, //NHD_R
abuckton 1:d1837531c318 50 0x00, //NCL_R
abuckton 1:d1837531c318 51 0x00 //FDL_R
abuckton 1:d1837531c318 52 };
abuckton 1:d1837531c318 53
abuckton 1:d1837531c318 54 writeMany(MHD_R,gtBaseline,4);
abuckton 1:d1837531c318 55
abuckton 1:d1837531c318 56 // Electrode filters for when data is < baseline
abuckton 1:d1837531c318 57 unsigned char ltBaseline[] = {
abuckton 1:d1837531c318 58 0x01, //MHD_F
abuckton 1:d1837531c318 59 0x01, //NHD_F
abuckton 1:d1837531c318 60 0xFF, //NCL_F
abuckton 1:d1837531c318 61 0x02 //FDL_F
abuckton 1:d1837531c318 62 };
abuckton 0:2e5b82508aea 63
abuckton 1:d1837531c318 64 writeMany(MHD_F,ltBaseline,4);
abuckton 0:2e5b82508aea 65
abuckton 1:d1837531c318 66 // Electrode touch and release thresholds
abuckton 1:d1837531c318 67 unsigned char electrodeThresholds[] = {
abuckton 1:d1837531c318 68 E_THR_T, // Touch Threshhold
abuckton 1:d1837531c318 69 E_THR_R // Release Threshold
abuckton 1:d1837531c318 70 };
abuckton 1:d1837531c318 71
abuckton 1:d1837531c318 72 for(int i=0; i<12; i++){
abuckton 1:d1837531c318 73 int result = writeMany((ELE0_T+(i*2)),electrodeThresholds,2);
abuckton 1:d1837531c318 74 }
abuckton 1:d1837531c318 75
abuckton 1:d1837531c318 76 // Proximity Settings
abuckton 1:d1837531c318 77 unsigned char proximitySettings[] = {
abuckton 1:d1837531c318 78 0xff, //MHD_Prox_R
abuckton 1:d1837531c318 79 0xff, //NHD_Prox_R
abuckton 1:d1837531c318 80 0x00, //NCL_Prox_R
abuckton 1:d1837531c318 81 0x00, //FDL_Prox_R
abuckton 1:d1837531c318 82 0x01, //MHD_Prox_F
abuckton 1:d1837531c318 83 0x01, //NHD_Prox_F
abuckton 1:d1837531c318 84 0xFF, //NCL_Prox_F
abuckton 1:d1837531c318 85 0xff, //FDL_Prox_F
abuckton 1:d1837531c318 86 0x00, //NHD_Prox_T
abuckton 1:d1837531c318 87 0x00, //NCL_Prox_T
abuckton 1:d1837531c318 88 0x00 //NFD_Prox_T
abuckton 1:d1837531c318 89 };
abuckton 1:d1837531c318 90 writeMany(MHDPROXR,proximitySettings,11);
abuckton 1:d1837531c318 91
abuckton 1:d1837531c318 92 unsigned char proxThresh[] = {
abuckton 1:d1837531c318 93 PROX_THR_T, // Touch Threshold
abuckton 1:d1837531c318 94 PROX_THR_R // Release Threshold
abuckton 1:d1837531c318 95 };
abuckton 1:d1837531c318 96 writeMany(EPROXTTH,proxThresh,2);
abuckton 1:d1837531c318 97
abuckton 1:d1837531c318 98 this->write(FIL_CFG,0x04);
abuckton 1:d1837531c318 99
abuckton 1:d1837531c318 100 // Set the electrode config to transition to active mode
abuckton 1:d1837531c318 101 this->write(ELE_CFG,0x0c);
abuckton 1:d1837531c318 102 }
abuckton 0:2e5b82508aea 103
abuckton 1:d1837531c318 104 void Mpr121::setElectrodeThreshold(int electrode, unsigned char touch, unsigned char release){
abuckton 1:d1837531c318 105
abuckton 1:d1837531c318 106 if(electrode > 11) return;
abuckton 1:d1837531c318 107
abuckton 1:d1837531c318 108 // Get the current mode
abuckton 1:d1837531c318 109 unsigned char mode = this->read(ELE_CFG);
abuckton 1:d1837531c318 110
abuckton 1:d1837531c318 111 // Put the MPR into setup mode
abuckton 1:d1837531c318 112 this->write(ELE_CFG,0x00);
abuckton 1:d1837531c318 113
abuckton 1:d1837531c318 114 // Write the new threshold
abuckton 1:d1837531c318 115 this->write((ELE0_T+(electrode*2)), touch);
abuckton 1:d1837531c318 116 this->write((ELE0_T+(electrode*2)+1), release);
abuckton 1:d1837531c318 117
abuckton 1:d1837531c318 118 //Restore the operating mode
abuckton 1:d1837531c318 119 this->write(ELE_CFG, mode);
abuckton 1:d1837531c318 120 }
abuckton 1:d1837531c318 121
abuckton 1:d1837531c318 122
abuckton 1:d1837531c318 123 unsigned char Mpr121::read(int key){
abuckton 1:d1837531c318 124
abuckton 1:d1837531c318 125 unsigned char data[2];
abuckton 1:d1837531c318 126
abuckton 1:d1837531c318 127 //Start the command
abuckton 1:d1837531c318 128 i2c->start();
abuckton 1:d1837531c318 129
abuckton 1:d1837531c318 130 // Address the target (Write mode)
abuckton 1:d1837531c318 131 int ack1= i2c->write(address);
abuckton 1:d1837531c318 132
abuckton 1:d1837531c318 133 // Set the register key to read
abuckton 1:d1837531c318 134 int ack2 = i2c->write(key);
abuckton 1:d1837531c318 135
abuckton 1:d1837531c318 136 // Re-start for read of data
abuckton 1:d1837531c318 137 i2c->start();
abuckton 1:d1837531c318 138
abuckton 1:d1837531c318 139 // Re-send the target address in read mode
abuckton 1:d1837531c318 140 int ack3 = i2c->write(address+1);
abuckton 0:2e5b82508aea 141
abuckton 1:d1837531c318 142 // Read in the result
abuckton 1:d1837531c318 143 data[0] = i2c->read(0);
abuckton 1:d1837531c318 144
abuckton 1:d1837531c318 145 // Reset the bus
abuckton 1:d1837531c318 146 i2c->stop();
abuckton 1:d1837531c318 147
abuckton 1:d1837531c318 148 return data[0];
abuckton 1:d1837531c318 149 }
abuckton 1:d1837531c318 150
abuckton 1:d1837531c318 151
abuckton 1:d1837531c318 152 int Mpr121::write(int key, unsigned char value){
abuckton 1:d1837531c318 153
abuckton 1:d1837531c318 154 //Start the command
abuckton 1:d1837531c318 155 i2c->start();
abuckton 1:d1837531c318 156
abuckton 1:d1837531c318 157 // Address the target (Write mode)
abuckton 1:d1837531c318 158 int ack1= i2c->write(address);
abuckton 0:2e5b82508aea 159
abuckton 1:d1837531c318 160 // Set the register key to write
abuckton 1:d1837531c318 161 int ack2 = i2c->write(key);
abuckton 1:d1837531c318 162
abuckton 1:d1837531c318 163 // Read in the result
abuckton 1:d1837531c318 164 int ack3 = i2c->write(value);
abuckton 1:d1837531c318 165
abuckton 1:d1837531c318 166 // Reset the bus
abuckton 1:d1837531c318 167 i2c->stop();
abuckton 1:d1837531c318 168
abuckton 1:d1837531c318 169 return (ack1+ack2+ack3)-3;
abuckton 1:d1837531c318 170 }
abuckton 1:d1837531c318 171
abuckton 1:d1837531c318 172
abuckton 1:d1837531c318 173 int Mpr121::writeMany(int start, unsigned char* dataSet, int length){
abuckton 1:d1837531c318 174 //Start the command
abuckton 1:d1837531c318 175 i2c->start();
abuckton 1:d1837531c318 176
abuckton 1:d1837531c318 177 // Address the target (Write mode)
abuckton 1:d1837531c318 178 int ack= i2c->write(address);
abuckton 1:d1837531c318 179 if(ack!=1){
abuckton 1:d1837531c318 180 return -1;
abuckton 0:2e5b82508aea 181 }
abuckton 0:2e5b82508aea 182
abuckton 1:d1837531c318 183 // Set the register key to write
abuckton 1:d1837531c318 184 ack = i2c->write(start);
abuckton 1:d1837531c318 185 if(ack!=1){
abuckton 1:d1837531c318 186 return -1;
abuckton 0:2e5b82508aea 187 }
abuckton 0:2e5b82508aea 188
abuckton 1:d1837531c318 189 // Write the date set
abuckton 1:d1837531c318 190 int count = 0;
abuckton 1:d1837531c318 191 while(ack==1 && (count < length)){
abuckton 1:d1837531c318 192 ack = i2c->write(dataSet[count]);
abuckton 1:d1837531c318 193 count++;
abuckton 1:d1837531c318 194 }
abuckton 1:d1837531c318 195 // Stop the cmd
abuckton 1:d1837531c318 196 i2c->stop();
abuckton 1:d1837531c318 197
abuckton 1:d1837531c318 198 return count;
abuckton 1:d1837531c318 199 }
abuckton 1:d1837531c318 200
abuckton 0:2e5b82508aea 201
abuckton 1:d1837531c318 202 bool Mpr121::getProximityMode(){
abuckton 1:d1837531c318 203 if(this->read(ELE_CFG) > 0x0c)
abuckton 1:d1837531c318 204 return true;
abuckton 1:d1837531c318 205 else
abuckton 1:d1837531c318 206 return false;
abuckton 1:d1837531c318 207 }
abuckton 1:d1837531c318 208
abuckton 1:d1837531c318 209 void Mpr121::setProximityMode(bool mode){
abuckton 1:d1837531c318 210 this->write(ELE_CFG,0x00);
abuckton 1:d1837531c318 211 if(mode){
abuckton 1:d1837531c318 212 this->write(ELE_CFG,0x30); //Sense proximity from ALL pads
abuckton 1:d1837531c318 213 } else {
abuckton 1:d1837531c318 214 this->write(ELE_CFG,0x0c); //Sense touch, all 12 pads active.
abuckton 1:d1837531c318 215 }
abuckton 1:d1837531c318 216 }
abuckton 1:d1837531c318 217
abuckton 1:d1837531c318 218
abuckton 1:d1837531c318 219 int Mpr121::readTouchData(){
abuckton 1:d1837531c318 220 return this->read(0x00);
abuckton 1:d1837531c318 221 }