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

mpr121.cpp@2:d4fbe8a6302e, 2022-04-27 (annotated)

Committer:
javenho14
Date:
Wed Apr 27 01:34:47 2022 +0000
Revision:
2:d4fbe8a6302e
Init

Who changed what in which revision?

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javenho14 2:d4fbe8a6302e 1 /*
javenho14 2:d4fbe8a6302e 2 Copyright (c) 2011 Anthony Buckton (abuckton [at] blackink [dot} net {dot} au)
javenho14 2:d4fbe8a6302e 3
javenho14 2:d4fbe8a6302e 4 Permission is hereby granted, free of charge, to any person obtaining a copy
javenho14 2:d4fbe8a6302e 5 of this software and associated documentation files (the "Software"), to deal
javenho14 2:d4fbe8a6302e 6 in the Software without restriction, including without limitation the rights
javenho14 2:d4fbe8a6302e 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
javenho14 2:d4fbe8a6302e 8 copies of the Software, and to permit persons to whom the Software is
javenho14 2:d4fbe8a6302e 9 furnished to do so, subject to the following conditions:
javenho14 2:d4fbe8a6302e 10
javenho14 2:d4fbe8a6302e 11 The above copyright notice and this permission notice shall be included in
javenho14 2:d4fbe8a6302e 12 all copies or substantial portions of the Software.
javenho14 2:d4fbe8a6302e 13
javenho14 2:d4fbe8a6302e 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
javenho14 2:d4fbe8a6302e 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
javenho14 2:d4fbe8a6302e 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
javenho14 2:d4fbe8a6302e 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
javenho14 2:d4fbe8a6302e 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
javenho14 2:d4fbe8a6302e 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
javenho14 2:d4fbe8a6302e 20 THE SOFTWARE.
javenho14 2:d4fbe8a6302e 21 */
javenho14 2:d4fbe8a6302e 22
javenho14 2:d4fbe8a6302e 23 #include <mbed.h>
javenho14 2:d4fbe8a6302e 24 #include <sstream>
javenho14 2:d4fbe8a6302e 25 #include <string>
javenho14 2:d4fbe8a6302e 26 #include <list>
javenho14 2:d4fbe8a6302e 27
javenho14 2:d4fbe8a6302e 28 #include <mpr121.h>
javenho14 2:d4fbe8a6302e 29
javenho14 2:d4fbe8a6302e 30 Mpr121::Mpr121(I2C *i2c, Address i2cAddress)
javenho14 2:d4fbe8a6302e 31 {
javenho14 2:d4fbe8a6302e 32 this->i2c = i2c;
javenho14 2:d4fbe8a6302e 33
javenho14 2:d4fbe8a6302e 34 address = i2cAddress;
javenho14 2:d4fbe8a6302e 35
javenho14 2:d4fbe8a6302e 36 // Configure the MPR121 settings to default
javenho14 2:d4fbe8a6302e 37 this->configureSettings();
javenho14 2:d4fbe8a6302e 38 }
javenho14 2:d4fbe8a6302e 39
javenho14 2:d4fbe8a6302e 40
javenho14 2:d4fbe8a6302e 41 void Mpr121::configureSettings()
javenho14 2:d4fbe8a6302e 42 {
javenho14 2:d4fbe8a6302e 43 // Put the MPR into setup mode
javenho14 2:d4fbe8a6302e 44 this->write(ELE_CFG,0x00);
javenho14 2:d4fbe8a6302e 45
javenho14 2:d4fbe8a6302e 46 // Electrode filters for when data is > baseline
javenho14 2:d4fbe8a6302e 47 unsigned char gtBaseline[] = {
javenho14 2:d4fbe8a6302e 48 0x01, //MHD_R
javenho14 2:d4fbe8a6302e 49 0x01, //NHD_R
javenho14 2:d4fbe8a6302e 50 0x00, //NCL_R
javenho14 2:d4fbe8a6302e 51 0x00 //FDL_R
javenho14 2:d4fbe8a6302e 52 };
javenho14 2:d4fbe8a6302e 53
javenho14 2:d4fbe8a6302e 54 writeMany(MHD_R,gtBaseline,4);
javenho14 2:d4fbe8a6302e 55
javenho14 2:d4fbe8a6302e 56 // Electrode filters for when data is < baseline
javenho14 2:d4fbe8a6302e 57 unsigned char ltBaseline[] = {
javenho14 2:d4fbe8a6302e 58 0x01, //MHD_F
javenho14 2:d4fbe8a6302e 59 0x01, //NHD_F
javenho14 2:d4fbe8a6302e 60 0xFF, //NCL_F
javenho14 2:d4fbe8a6302e 61 0x02 //FDL_F
javenho14 2:d4fbe8a6302e 62 };
javenho14 2:d4fbe8a6302e 63
javenho14 2:d4fbe8a6302e 64 writeMany(MHD_F,ltBaseline,4);
javenho14 2:d4fbe8a6302e 65
javenho14 2:d4fbe8a6302e 66 // Electrode touch and release thresholds
javenho14 2:d4fbe8a6302e 67 unsigned char electrodeThresholds[] = {
javenho14 2:d4fbe8a6302e 68 E_THR_T, // Touch Threshhold
javenho14 2:d4fbe8a6302e 69 E_THR_R // Release Threshold
javenho14 2:d4fbe8a6302e 70 };
javenho14 2:d4fbe8a6302e 71
javenho14 2:d4fbe8a6302e 72 for(int i=0; i<12; i++){
javenho14 2:d4fbe8a6302e 73 int result = writeMany((ELE0_T+(i*2)),electrodeThresholds,2);
javenho14 2:d4fbe8a6302e 74 }
javenho14 2:d4fbe8a6302e 75
javenho14 2:d4fbe8a6302e 76 // Proximity Settings
javenho14 2:d4fbe8a6302e 77 unsigned char proximitySettings[] = {
javenho14 2:d4fbe8a6302e 78 0xff, //MHD_Prox_R
javenho14 2:d4fbe8a6302e 79 0xff, //NHD_Prox_R
javenho14 2:d4fbe8a6302e 80 0x00, //NCL_Prox_R
javenho14 2:d4fbe8a6302e 81 0x00, //FDL_Prox_R
javenho14 2:d4fbe8a6302e 82 0x01, //MHD_Prox_F
javenho14 2:d4fbe8a6302e 83 0x01, //NHD_Prox_F
javenho14 2:d4fbe8a6302e 84 0xFF, //NCL_Prox_F
javenho14 2:d4fbe8a6302e 85 0xff, //FDL_Prox_F
javenho14 2:d4fbe8a6302e 86 0x00, //NHD_Prox_T
javenho14 2:d4fbe8a6302e 87 0x00, //NCL_Prox_T
javenho14 2:d4fbe8a6302e 88 0x00 //NFD_Prox_T
javenho14 2:d4fbe8a6302e 89 };
javenho14 2:d4fbe8a6302e 90 writeMany(MHDPROXR,proximitySettings,11);
javenho14 2:d4fbe8a6302e 91
javenho14 2:d4fbe8a6302e 92 unsigned char proxThresh[] = {
javenho14 2:d4fbe8a6302e 93 PROX_THR_T, // Touch Threshold
javenho14 2:d4fbe8a6302e 94 PROX_THR_R // Release Threshold
javenho14 2:d4fbe8a6302e 95 };
javenho14 2:d4fbe8a6302e 96 writeMany(EPROXTTH,proxThresh,2);
javenho14 2:d4fbe8a6302e 97
javenho14 2:d4fbe8a6302e 98 this->write(FIL_CFG,0x04);
javenho14 2:d4fbe8a6302e 99
javenho14 2:d4fbe8a6302e 100 // Set the electrode config to transition to active mode
javenho14 2:d4fbe8a6302e 101 this->write(ELE_CFG,0x0c);
javenho14 2:d4fbe8a6302e 102 }
javenho14 2:d4fbe8a6302e 103
javenho14 2:d4fbe8a6302e 104 void Mpr121::setElectrodeThreshold(int electrode, unsigned char touch, unsigned char release){
javenho14 2:d4fbe8a6302e 105
javenho14 2:d4fbe8a6302e 106 if(electrode > 11) return;
javenho14 2:d4fbe8a6302e 107
javenho14 2:d4fbe8a6302e 108 // Get the current mode
javenho14 2:d4fbe8a6302e 109 unsigned char mode = this->read(ELE_CFG);
javenho14 2:d4fbe8a6302e 110
javenho14 2:d4fbe8a6302e 111 // Put the MPR into setup mode
javenho14 2:d4fbe8a6302e 112 this->write(ELE_CFG,0x00);
javenho14 2:d4fbe8a6302e 113
javenho14 2:d4fbe8a6302e 114 // Write the new threshold
javenho14 2:d4fbe8a6302e 115 this->write((ELE0_T+(electrode*2)), touch);
javenho14 2:d4fbe8a6302e 116 this->write((ELE0_T+(electrode*2)+1), release);
javenho14 2:d4fbe8a6302e 117
javenho14 2:d4fbe8a6302e 118 //Restore the operating mode
javenho14 2:d4fbe8a6302e 119 this->write(ELE_CFG, mode);
javenho14 2:d4fbe8a6302e 120 }
javenho14 2:d4fbe8a6302e 121
javenho14 2:d4fbe8a6302e 122
javenho14 2:d4fbe8a6302e 123 unsigned char Mpr121::read(int key){
javenho14 2:d4fbe8a6302e 124
javenho14 2:d4fbe8a6302e 125 unsigned char data[2];
javenho14 2:d4fbe8a6302e 126
javenho14 2:d4fbe8a6302e 127 //Start the command
javenho14 2:d4fbe8a6302e 128 i2c->start();
javenho14 2:d4fbe8a6302e 129
javenho14 2:d4fbe8a6302e 130 // Address the target (Write mode)
javenho14 2:d4fbe8a6302e 131 int ack1= i2c->write(address);
javenho14 2:d4fbe8a6302e 132
javenho14 2:d4fbe8a6302e 133 // Set the register key to read
javenho14 2:d4fbe8a6302e 134 int ack2 = i2c->write(key);
javenho14 2:d4fbe8a6302e 135
javenho14 2:d4fbe8a6302e 136 // Re-start for read of data
javenho14 2:d4fbe8a6302e 137 i2c->start();
javenho14 2:d4fbe8a6302e 138
javenho14 2:d4fbe8a6302e 139 // Re-send the target address in read mode
javenho14 2:d4fbe8a6302e 140 int ack3 = i2c->write(address+1);
javenho14 2:d4fbe8a6302e 141
javenho14 2:d4fbe8a6302e 142 // Read in the result
javenho14 2:d4fbe8a6302e 143 data[0] = i2c->read(0);
javenho14 2:d4fbe8a6302e 144
javenho14 2:d4fbe8a6302e 145 // Reset the bus
javenho14 2:d4fbe8a6302e 146 i2c->stop();
javenho14 2:d4fbe8a6302e 147
javenho14 2:d4fbe8a6302e 148 return data[0];
javenho14 2:d4fbe8a6302e 149 }
javenho14 2:d4fbe8a6302e 150
javenho14 2:d4fbe8a6302e 151
javenho14 2:d4fbe8a6302e 152 int Mpr121::write(int key, unsigned char value){
javenho14 2:d4fbe8a6302e 153
javenho14 2:d4fbe8a6302e 154 //Start the command
javenho14 2:d4fbe8a6302e 155 i2c->start();
javenho14 2:d4fbe8a6302e 156
javenho14 2:d4fbe8a6302e 157 // Address the target (Write mode)
javenho14 2:d4fbe8a6302e 158 int ack1= i2c->write(address);
javenho14 2:d4fbe8a6302e 159
javenho14 2:d4fbe8a6302e 160 // Set the register key to write
javenho14 2:d4fbe8a6302e 161 int ack2 = i2c->write(key);
javenho14 2:d4fbe8a6302e 162
javenho14 2:d4fbe8a6302e 163 // Read in the result
javenho14 2:d4fbe8a6302e 164 int ack3 = i2c->write(value);
javenho14 2:d4fbe8a6302e 165
javenho14 2:d4fbe8a6302e 166 // Reset the bus
javenho14 2:d4fbe8a6302e 167 i2c->stop();
javenho14 2:d4fbe8a6302e 168
javenho14 2:d4fbe8a6302e 169 return (ack1+ack2+ack3)-3;
javenho14 2:d4fbe8a6302e 170 }
javenho14 2:d4fbe8a6302e 171
javenho14 2:d4fbe8a6302e 172
javenho14 2:d4fbe8a6302e 173 int Mpr121::writeMany(int start, unsigned char* dataSet, int length){
javenho14 2:d4fbe8a6302e 174 //Start the command
javenho14 2:d4fbe8a6302e 175 i2c->start();
javenho14 2:d4fbe8a6302e 176
javenho14 2:d4fbe8a6302e 177 // Address the target (Write mode)
javenho14 2:d4fbe8a6302e 178 int ack= i2c->write(address);
javenho14 2:d4fbe8a6302e 179 if(ack!=1){
javenho14 2:d4fbe8a6302e 180 return -1;
javenho14 2:d4fbe8a6302e 181 }
javenho14 2:d4fbe8a6302e 182
javenho14 2:d4fbe8a6302e 183 // Set the register key to write
javenho14 2:d4fbe8a6302e 184 ack = i2c->write(start);
javenho14 2:d4fbe8a6302e 185 if(ack!=1){
javenho14 2:d4fbe8a6302e 186 return -1;
javenho14 2:d4fbe8a6302e 187 }
javenho14 2:d4fbe8a6302e 188
javenho14 2:d4fbe8a6302e 189 // Write the date set
javenho14 2:d4fbe8a6302e 190 int count = 0;
javenho14 2:d4fbe8a6302e 191 while(ack==1 && (count < length)){
javenho14 2:d4fbe8a6302e 192 ack = i2c->write(dataSet[count]);
javenho14 2:d4fbe8a6302e 193 count++;
javenho14 2:d4fbe8a6302e 194 }
javenho14 2:d4fbe8a6302e 195 // Stop the cmd
javenho14 2:d4fbe8a6302e 196 i2c->stop();
javenho14 2:d4fbe8a6302e 197
javenho14 2:d4fbe8a6302e 198 return count;
javenho14 2:d4fbe8a6302e 199 }
javenho14 2:d4fbe8a6302e 200
javenho14 2:d4fbe8a6302e 201
javenho14 2:d4fbe8a6302e 202 bool Mpr121::getProximityMode(){
javenho14 2:d4fbe8a6302e 203 if(this->read(ELE_CFG) > 0x0c)
javenho14 2:d4fbe8a6302e 204 return true;
javenho14 2:d4fbe8a6302e 205 else
javenho14 2:d4fbe8a6302e 206 return false;
javenho14 2:d4fbe8a6302e 207 }
javenho14 2:d4fbe8a6302e 208
javenho14 2:d4fbe8a6302e 209 void Mpr121::setProximityMode(bool mode){
javenho14 2:d4fbe8a6302e 210 this->write(ELE_CFG,0x00);
javenho14 2:d4fbe8a6302e 211 if(mode){
javenho14 2:d4fbe8a6302e 212 this->write(ELE_CFG,0x30); //Sense proximity from ALL pads
javenho14 2:d4fbe8a6302e 213 } else {
javenho14 2:d4fbe8a6302e 214 this->write(ELE_CFG,0x0c); //Sense touch, all 12 pads active.
javenho14 2:d4fbe8a6302e 215 }
javenho14 2:d4fbe8a6302e 216 }
javenho14 2:d4fbe8a6302e 217
javenho14 2:d4fbe8a6302e 218
javenho14 2:d4fbe8a6302e 219 int Mpr121::readTouchData(){
javenho14 2:d4fbe8a6302e 220 return this->read(0x00);
javenho14 2:d4fbe8a6302e 221 }