ITG3200 library with multiple configurable full-scale ranges. Based on the Sensor_test by Bo Carøe.

Dependents:   KalmanFilter

Fork of ITG3200 by Claudio Donate

ITG3200.cpp

Committer:
caroe
Date:
2012-05-30
Revision:
0:a3a0caa8e802
Child:
1:1208ffc3ace9

File content as of revision 0:a3a0caa8e802:

#include "mbed.h"
#include "ITG3200.h"

#define I2CADR_W(ADR)           (ADR<<1&0xFE)
#define I2CADR_R(ADR)           (ADR<<1|0x01)

//Initialisieren
ITG3200::ITG3200(I2C & I2CBus_, Timer & GlobalTime_)
    : I2CBus(I2CBus_),
      GlobalTime(GlobalTime_)
{}

void ITG3200::Init()
{
    //Nullsetzen
    for(int i= 0; i < 3; i++)
    {
        RawRate[i]= 0;
        Offset[i]= 0.0;
        Rate[i]= 0.0;
    }
    
       
    //ITG3200 initialisieren
    char tx[2];
        
    //Full-Scale (2000deg/sec) nutzen
    //Digitalen Low Pass Filter auf 10 Hz setzen
    //Intern mit 1 kHz sampeln
    tx[0]= 0x16;
    tx[1]= 0x1D;
    I2CBus.write(I2CADR_W(ITG3200_ADRESS), tx, 2);
    
    //Einen internen Taktgeber verwenden (X-Gyro)
    tx[0]= 0x3E;
    tx[1]= 0x01;
    I2CBus.write(I2CADR_W(ITG3200_ADRESS), tx, 2);
    
    //kurz warten
    wait_ms(100);
    
    //erste Werte abholen  
    Update();
}


//Rohdaten lesen
void ITG3200::ReadRawData()
{
    //Drehrate aller Axen abholen
    char tx[1];
    char rx[6];
     
    tx[0]= 0x1D;
    I2CBus.write(I2CADR_W(ITG3200_ADRESS), tx, 1);
    I2CBus.read (I2CADR_R(ITG3200_ADRESS), rx, 6); 
    
    //Aus den einzelnen Bytes den 16-Bit-Wert zusammenbauen
    RawRate[0]= rx[0]<<8|rx[1];
    RawRate[1]= rx[2]<<8|rx[3];
    RawRate[2]= rx[4]<<8|rx[5];
}


//Update-Methode
void ITG3200::Update()
{
    //Rohdaten lesen
    ReadRawData();    
   
    //Drehrate berechnen
    Rate[0]= fConvRPS * ((float)RawRate[0] + Offset[0]);
    Rate[1]= fConvRPS * ((float)RawRate[1] + Offset[1]);
    Rate[2]= fConvRPS * ((float)RawRate[2] + Offset[2]);
}

//Kalibrieren
void ITG3200::Calibrate(int ms)
{
    float AvgCalibRate[3]= {0.0, 0.0, 0.0};    
    float AvgCalibSampels= 0.0;
    
    //Ende der Kalibrierung in ms Millisekunden berechnen
    int CalibEnd= GlobalTime.read_ms() + ms;
    
    while(GlobalTime.read_ms() < CalibEnd)
    {    
        //Rohdaten lesen
        ReadRawData();
        
        //Durchschnitt bilden
        AvgCalibRate[0]+= (float)RawRate[0];
        AvgCalibRate[1]+= (float)RawRate[1];
        AvgCalibRate[2]+= (float)RawRate[2];
        AvgCalibSampels+= 1.0;
        
        wait_ms(2);    
    }
    
    //Genug Daten gesammelt, jetzt den Durchschnitt bilden
    Offset[0]= -(AvgCalibRate[0] / AvgCalibSampels);
    Offset[1]= -(AvgCalibRate[1] / AvgCalibSampels);
    Offset[2]= -(AvgCalibRate[2] / AvgCalibSampels);
}