File content as of revision 0:2e5b82508aea:

#include <mbed.h>
#include <sstream>
#include <string>
#include <list>

#include <mpr121.h>

using namespace std;
    
    Mpr121::Mpr121(I2C *i2c, Address i2cAddress)
    {
        this->i2c = i2c;
        
        address = i2cAddress;
               
        // Configure the MPR121 settings to default
        this->configureSettings();
    }
    
       
    void Mpr121::configureSettings()
    {
        // Put the MPR into setup mode
        this->write(ELE_CFG,0x00);
        
        // Electrode filters for when data is > baseline
        unsigned char gtBaseline[] = {
             0x01,  //MHD_R
             0x01,  //NHD_R 
             0x00,  //NCL_R
             0x00   //FDL_R
             };
             
        writeMany(MHD_R,gtBaseline,4);   
                     
         // Electrode filters for when data is < baseline   
         unsigned char ltBaseline[] = {
            0x01,   //MHD_F
            0x01,   //NHD_F
            0xFF,   //NCL_F
            0x02    //FDL_F
            };
            
        writeMany(MHD_F,ltBaseline,4);
            
        // Electrode touch and release thresholds
        unsigned char electrodeThresholds[] = {
            E_THR_T, // Touch Threshhold
            E_THR_R  // Release Threshold
            };

        for(int i=0; i<12; i++){
            int result = writeMany((ELE0_T+(i*2)),electrodeThresholds,2);
        }   

        // Proximity Settings
        unsigned char proximitySettings[] = {
            0xff,   //MHD_Prox_R
            0xff,   //NHD_Prox_R
            0x00,   //NCL_Prox_R
            0x00,   //FDL_Prox_R
            0x01,   //MHD_Prox_F
            0x01,   //NHD_Prox_F
            0xFF,   //NCL_Prox_F
            0xff,   //FDL_Prox_F
            0x00,   //NHD_Prox_T
            0x00,   //NCL_Prox_T
            0x00    //NFD_Prox_T
            };
        writeMany(MHDPROXR,proximitySettings,11);

        unsigned char proxThresh[] = {
            PROX_THR_T, // Touch Threshold
            PROX_THR_R  // Release Threshold
            };
        writeMany(EPROXTTH,proxThresh,2); 
           
        this->write(FIL_CFG,0x04);
        
        // Set the electrode config to transition to active mode
        this->write(ELE_CFG,0x0c);
    }
    
    void Mpr121::setElectrodeThreshold(int electrode, unsigned char touch, unsigned char release){
        
        if(electrode > 11) return;
        
        // Get the current mode
        unsigned char mode = this->read(ELE_CFG);
        
        // Put the MPR into setup mode
        this->write(ELE_CFG,0x00);
        
        // Write the new threshold
        this->write((ELE0_T+(electrode*2)), touch);
        this->write((ELE0_T+(electrode*2)+1), release);
        
        //Restore the operating mode
        this->write(ELE_CFG, mode);
    }
        
        
    unsigned char Mpr121::read(int key){

        unsigned char data[2];
        
        //Start the command
        i2c->start();

        // Address the target (Write mode)
        int ack1= i2c->write(address);

        // Set the register key to read
        int ack2 = i2c->write(key);

        // Re-start for read of data
        i2c->start();

        // Re-send the target address in read mode
        int ack3 = i2c->write(address+1);

        // Read in the result
        data[0] = i2c->read(0); 

        // Reset the bus        
        i2c->stop();

        return data[0];
    }
    
    
    int Mpr121::write(int key, unsigned char value){
        
        //Start the command
        i2c->start();

        // Address the target (Write mode)
        int ack1= i2c->write(address);

        // Set the register key to write
        int ack2 = i2c->write(key);

        // Read in the result
        int ack3 = i2c->write(value); 

        // Reset the bus        
        i2c->stop();
        
        return (ack1+ack2+ack3)-3;
    }
    
    
    int Mpr121::writeMany(int start, unsigned char* dataSet, int length){
        //Start the command
        i2c->start();

        // Address the target (Write mode)
        int ack= i2c->write(address);
        if(ack!=1){
            return -1;
        }
        
        // Set the register key to write
        ack = i2c->write(start);
        if(ack!=1){
            return -1;
        }

        // Write the date set
        int count = 0;
        while(ack==1 && (count < length)){
            ack = i2c->write(dataSet[count]);
            count++;
        } 
        // Stop the cmd
        i2c->stop();
        
        return count;
    }
          
    
    bool Mpr121::getProximityMode(){
        if(this->read(ELE_CFG) > 0x0c)
            return true;
        else
            return false;
    }
    
    void Mpr121::setProximityMode(bool mode){
        this->write(ELE_CFG,0x00);
        if(mode){
            this->write(ELE_CFG,0x30); //Sense proximity from ALL pads
        } else {
            this->write(ELE_CFG,0x0c); //Sense touch, all 12 pads active.
        }
    }


    int Mpr121::readTouchData(){
        return this->read(0x00);
    }