File content as of revision 0:9a49249d42b3:

#ifndef CPP_TO_PIGPIO_I2C_HEADER
#include <CPPToPigpio.h>
#endif
#include <sstream>
#include <string>
#include <list>
 
#include "MPR121.h"
Mpr121::Mpr121(CPPToPigpio::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 int data[2];
    char out[2]={0};
    char cmd[] = {CPPToPigpio::I2C::Start, CPPToPigpio::I2C::Addr, address, CPPToPigpio::I2C::Write,
		0x01, key, CPPToPigpio::I2C::Start, CPPToPigpio::I2C::Read,0x02, CPPToPigpio::I2C::Stop, 
		CPPToPigpio::I2C::End};
	int ack = i2c->bang(cmd, 11, out, 2, false);
	//printf("ack_read: %d", ack);
    //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();*/
	data[0] = out[0];
    return (unsigned char)data[0];
}
 
 
int Mpr121::write(int key, unsigned char value){
    
    char out[1]={0};
    char keyc = static_cast<char>(key);
    char valc = static_cast<char>(value);
    char cmd[] = {CPPToPigpio::I2C::Start, CPPToPigpio::I2C::Addr, address, CPPToPigpio::I2C::Write,
		0x02, keyc, valc, CPPToPigpio::I2C::Stop, CPPToPigpio::I2C::End};
	int ack = i2c->bang(cmd, 9, out, 1, false);
    //printf("ack_write: %d", ack);
    //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 ack-1;
}
 
 
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();*/
    
    char datasetb[length+1] = {0};
    datasetb[0] = start;
    for (int i=0; i<length; i++){
		datasetb[i+1]=static_cast<char>(dataSet[i]);
		//printf("a: %x, b :%x\n", dataSet[i], datasetb[i+1]);
	}
	//printf("here\n");
	int count = i2c->write(address, datasetb, length+1, false);
    
    
    
    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);
}