Karl Nicolaus / Mbed 2 deprecated 4180_Lab1_P6

t

Dependencies:   mbed

mpr121.cpp@0:2e5b82508aea, 2011-02-28 (annotated)

Committer:
abuckton
Date:
Mon Feb 28 12:07:17 2011 +0000
Revision:
0:2e5b82508aea
Child:
1:d1837531c318
First cut to get things moving

Who changed what in which revision?

UserRevisionLine numberNew contents of line
abuckton 0:2e5b82508aea 1 #include <mbed.h>
abuckton 0:2e5b82508aea 2 #include <sstream>
abuckton 0:2e5b82508aea 3 #include <string>
abuckton 0:2e5b82508aea 4 #include <list>
abuckton 0:2e5b82508aea 5
abuckton 0:2e5b82508aea 6 #include <mpr121.h>
abuckton 0:2e5b82508aea 7
abuckton 0:2e5b82508aea 8 using namespace std;
abuckton 0:2e5b82508aea 9
abuckton 0:2e5b82508aea 10 Mpr121::Mpr121(I2C *i2c, Address i2cAddress)
abuckton 0:2e5b82508aea 11 {
abuckton 0:2e5b82508aea 12 this->i2c = i2c;
abuckton 0:2e5b82508aea 13
abuckton 0:2e5b82508aea 14 address = i2cAddress;
abuckton 0:2e5b82508aea 15
abuckton 0:2e5b82508aea 16 // Configure the MPR121 settings to default
abuckton 0:2e5b82508aea 17 this->configureSettings();
abuckton 0:2e5b82508aea 18 }
abuckton 0:2e5b82508aea 19
abuckton 0:2e5b82508aea 20
abuckton 0:2e5b82508aea 21 void Mpr121::configureSettings()
abuckton 0:2e5b82508aea 22 {
abuckton 0:2e5b82508aea 23 // Put the MPR into setup mode
abuckton 0:2e5b82508aea 24 this->write(ELE_CFG,0x00);
abuckton 0:2e5b82508aea 25
abuckton 0:2e5b82508aea 26 // Electrode filters for when data is > baseline
abuckton 0:2e5b82508aea 27 unsigned char gtBaseline[] = {
abuckton 0:2e5b82508aea 28 0x01, //MHD_R
abuckton 0:2e5b82508aea 29 0x01, //NHD_R
abuckton 0:2e5b82508aea 30 0x00, //NCL_R
abuckton 0:2e5b82508aea 31 0x00 //FDL_R
abuckton 0:2e5b82508aea 32 };
abuckton 0:2e5b82508aea 33
abuckton 0:2e5b82508aea 34 writeMany(MHD_R,gtBaseline,4);
abuckton 0:2e5b82508aea 35
abuckton 0:2e5b82508aea 36 // Electrode filters for when data is < baseline
abuckton 0:2e5b82508aea 37 unsigned char ltBaseline[] = {
abuckton 0:2e5b82508aea 38 0x01, //MHD_F
abuckton 0:2e5b82508aea 39 0x01, //NHD_F
abuckton 0:2e5b82508aea 40 0xFF, //NCL_F
abuckton 0:2e5b82508aea 41 0x02 //FDL_F
abuckton 0:2e5b82508aea 42 };
abuckton 0:2e5b82508aea 43
abuckton 0:2e5b82508aea 44 writeMany(MHD_F,ltBaseline,4);
abuckton 0:2e5b82508aea 45
abuckton 0:2e5b82508aea 46 // Electrode touch and release thresholds
abuckton 0:2e5b82508aea 47 unsigned char electrodeThresholds[] = {
abuckton 0:2e5b82508aea 48 E_THR_T, // Touch Threshhold
abuckton 0:2e5b82508aea 49 E_THR_R // Release Threshold
abuckton 0:2e5b82508aea 50 };
abuckton 0:2e5b82508aea 51
abuckton 0:2e5b82508aea 52 for(int i=0; i<12; i++){
abuckton 0:2e5b82508aea 53 int result = writeMany((ELE0_T+(i*2)),electrodeThresholds,2);
abuckton 0:2e5b82508aea 54 }
abuckton 0:2e5b82508aea 55
abuckton 0:2e5b82508aea 56 // Proximity Settings
abuckton 0:2e5b82508aea 57 unsigned char proximitySettings[] = {
abuckton 0:2e5b82508aea 58 0xff, //MHD_Prox_R
abuckton 0:2e5b82508aea 59 0xff, //NHD_Prox_R
abuckton 0:2e5b82508aea 60 0x00, //NCL_Prox_R
abuckton 0:2e5b82508aea 61 0x00, //FDL_Prox_R
abuckton 0:2e5b82508aea 62 0x01, //MHD_Prox_F
abuckton 0:2e5b82508aea 63 0x01, //NHD_Prox_F
abuckton 0:2e5b82508aea 64 0xFF, //NCL_Prox_F
abuckton 0:2e5b82508aea 65 0xff, //FDL_Prox_F
abuckton 0:2e5b82508aea 66 0x00, //NHD_Prox_T
abuckton 0:2e5b82508aea 67 0x00, //NCL_Prox_T
abuckton 0:2e5b82508aea 68 0x00 //NFD_Prox_T
abuckton 0:2e5b82508aea 69 };
abuckton 0:2e5b82508aea 70 writeMany(MHDPROXR,proximitySettings,11);
abuckton 0:2e5b82508aea 71
abuckton 0:2e5b82508aea 72 unsigned char proxThresh[] = {
abuckton 0:2e5b82508aea 73 PROX_THR_T, // Touch Threshold
abuckton 0:2e5b82508aea 74 PROX_THR_R // Release Threshold
abuckton 0:2e5b82508aea 75 };
abuckton 0:2e5b82508aea 76 writeMany(EPROXTTH,proxThresh,2);
abuckton 0:2e5b82508aea 77
abuckton 0:2e5b82508aea 78 this->write(FIL_CFG,0x04);
abuckton 0:2e5b82508aea 79
abuckton 0:2e5b82508aea 80 // Set the electrode config to transition to active mode
abuckton 0:2e5b82508aea 81 this->write(ELE_CFG,0x0c);
abuckton 0:2e5b82508aea 82 }
abuckton 0:2e5b82508aea 83
abuckton 0:2e5b82508aea 84 void Mpr121::setElectrodeThreshold(int electrode, unsigned char touch, unsigned char release){
abuckton 0:2e5b82508aea 85
abuckton 0:2e5b82508aea 86 if(electrode > 11) return;
abuckton 0:2e5b82508aea 87
abuckton 0:2e5b82508aea 88 // Get the current mode
abuckton 0:2e5b82508aea 89 unsigned char mode = this->read(ELE_CFG);
abuckton 0:2e5b82508aea 90
abuckton 0:2e5b82508aea 91 // Put the MPR into setup mode
abuckton 0:2e5b82508aea 92 this->write(ELE_CFG,0x00);
abuckton 0:2e5b82508aea 93
abuckton 0:2e5b82508aea 94 // Write the new threshold
abuckton 0:2e5b82508aea 95 this->write((ELE0_T+(electrode*2)), touch);
abuckton 0:2e5b82508aea 96 this->write((ELE0_T+(electrode*2)+1), release);
abuckton 0:2e5b82508aea 97
abuckton 0:2e5b82508aea 98 //Restore the operating mode
abuckton 0:2e5b82508aea 99 this->write(ELE_CFG, mode);
abuckton 0:2e5b82508aea 100 }
abuckton 0:2e5b82508aea 101
abuckton 0:2e5b82508aea 102
abuckton 0:2e5b82508aea 103 unsigned char Mpr121::read(int key){
abuckton 0:2e5b82508aea 104
abuckton 0:2e5b82508aea 105 unsigned char data[2];
abuckton 0:2e5b82508aea 106
abuckton 0:2e5b82508aea 107 //Start the command
abuckton 0:2e5b82508aea 108 i2c->start();
abuckton 0:2e5b82508aea 109
abuckton 0:2e5b82508aea 110 // Address the target (Write mode)
abuckton 0:2e5b82508aea 111 int ack1= i2c->write(address);
abuckton 0:2e5b82508aea 112
abuckton 0:2e5b82508aea 113 // Set the register key to read
abuckton 0:2e5b82508aea 114 int ack2 = i2c->write(key);
abuckton 0:2e5b82508aea 115
abuckton 0:2e5b82508aea 116 // Re-start for read of data
abuckton 0:2e5b82508aea 117 i2c->start();
abuckton 0:2e5b82508aea 118
abuckton 0:2e5b82508aea 119 // Re-send the target address in read mode
abuckton 0:2e5b82508aea 120 int ack3 = i2c->write(address+1);
abuckton 0:2e5b82508aea 121
abuckton 0:2e5b82508aea 122 // Read in the result
abuckton 0:2e5b82508aea 123 data[0] = i2c->read(0);
abuckton 0:2e5b82508aea 124
abuckton 0:2e5b82508aea 125 // Reset the bus
abuckton 0:2e5b82508aea 126 i2c->stop();
abuckton 0:2e5b82508aea 127
abuckton 0:2e5b82508aea 128 return data[0];
abuckton 0:2e5b82508aea 129 }
abuckton 0:2e5b82508aea 130
abuckton 0:2e5b82508aea 131
abuckton 0:2e5b82508aea 132 int Mpr121::write(int key, unsigned char value){
abuckton 0:2e5b82508aea 133
abuckton 0:2e5b82508aea 134 //Start the command
abuckton 0:2e5b82508aea 135 i2c->start();
abuckton 0:2e5b82508aea 136
abuckton 0:2e5b82508aea 137 // Address the target (Write mode)
abuckton 0:2e5b82508aea 138 int ack1= i2c->write(address);
abuckton 0:2e5b82508aea 139
abuckton 0:2e5b82508aea 140 // Set the register key to write
abuckton 0:2e5b82508aea 141 int ack2 = i2c->write(key);
abuckton 0:2e5b82508aea 142
abuckton 0:2e5b82508aea 143 // Read in the result
abuckton 0:2e5b82508aea 144 int ack3 = i2c->write(value);
abuckton 0:2e5b82508aea 145
abuckton 0:2e5b82508aea 146 // Reset the bus
abuckton 0:2e5b82508aea 147 i2c->stop();
abuckton 0:2e5b82508aea 148
abuckton 0:2e5b82508aea 149 return (ack1+ack2+ack3)-3;
abuckton 0:2e5b82508aea 150 }
abuckton 0:2e5b82508aea 151
abuckton 0:2e5b82508aea 152
abuckton 0:2e5b82508aea 153 int Mpr121::writeMany(int start, unsigned char* dataSet, int length){
abuckton 0:2e5b82508aea 154 //Start the command
abuckton 0:2e5b82508aea 155 i2c->start();
abuckton 0:2e5b82508aea 156
abuckton 0:2e5b82508aea 157 // Address the target (Write mode)
abuckton 0:2e5b82508aea 158 int ack= i2c->write(address);
abuckton 0:2e5b82508aea 159 if(ack!=1){
abuckton 0:2e5b82508aea 160 return -1;
abuckton 0:2e5b82508aea 161 }
abuckton 0:2e5b82508aea 162
abuckton 0:2e5b82508aea 163 // Set the register key to write
abuckton 0:2e5b82508aea 164 ack = i2c->write(start);
abuckton 0:2e5b82508aea 165 if(ack!=1){
abuckton 0:2e5b82508aea 166 return -1;
abuckton 0:2e5b82508aea 167 }
abuckton 0:2e5b82508aea 168
abuckton 0:2e5b82508aea 169 // Write the date set
abuckton 0:2e5b82508aea 170 int count = 0;
abuckton 0:2e5b82508aea 171 while(ack==1 && (count < length)){
abuckton 0:2e5b82508aea 172 ack = i2c->write(dataSet[count]);
abuckton 0:2e5b82508aea 173 count++;
abuckton 0:2e5b82508aea 174 }
abuckton 0:2e5b82508aea 175 // Stop the cmd
abuckton 0:2e5b82508aea 176 i2c->stop();
abuckton 0:2e5b82508aea 177
abuckton 0:2e5b82508aea 178 return count;
abuckton 0:2e5b82508aea 179 }
abuckton 0:2e5b82508aea 180
abuckton 0:2e5b82508aea 181
abuckton 0:2e5b82508aea 182 bool Mpr121::getProximityMode(){
abuckton 0:2e5b82508aea 183 if(this->read(ELE_CFG) > 0x0c)
abuckton 0:2e5b82508aea 184 return true;
abuckton 0:2e5b82508aea 185 else
abuckton 0:2e5b82508aea 186 return false;
abuckton 0:2e5b82508aea 187 }
abuckton 0:2e5b82508aea 188
abuckton 0:2e5b82508aea 189 void Mpr121::setProximityMode(bool mode){
abuckton 0:2e5b82508aea 190 this->write(ELE_CFG,0x00);
abuckton 0:2e5b82508aea 191 if(mode){
abuckton 0:2e5b82508aea 192 this->write(ELE_CFG,0x30); //Sense proximity from ALL pads
abuckton 0:2e5b82508aea 193 } else {
abuckton 0:2e5b82508aea 194 this->write(ELE_CFG,0x0c); //Sense touch, all 12 pads active.
abuckton 0:2e5b82508aea 195 }
abuckton 0:2e5b82508aea 196 }
abuckton 0:2e5b82508aea 197
abuckton 0:2e5b82508aea 198
abuckton 0:2e5b82508aea 199 int Mpr121::readTouchData(){
abuckton 0:2e5b82508aea 200 return this->read(0x00);
abuckton 0:2e5b82508aea 201 }