File content as of revision 0:dfe5ae6ea375:

 /**
* 
*
*/

#include "scp1000.h"

SCP1000::SCP1000(PinName mosi, PinName miso, PinName sck, PinName CSB):
     _spi(mosi, miso, sck),
    _CSB(CSB)
    /* _DRDY(NULL),
     _TRIG(Null),        
     _PD(NULL)*/{
    _CSB = 1;
    wait(0.1);
    _CSB = 0;
    //Force reset
    _spi.write(((0x06<< 2) | 0x02));
    _spi.write(0x01);
    _CSB = 1;
    wait(0.06);
    _CSB = 0;
    //Check starup Procedure has finished
    int status;
     do{
        _spi.write(0x07 << 2);
        status = _spi.write(0x00);
        //printf("waiting for startup to finish %i\n", status);
        wait(0.1);
    }while((status & 0x01));                                  //Wait for LSB to go low
    
    _spi.write(0x1F << 2);
    status = _spi.write(0x00);
    if(!(status & 0x01)){
        printf("Error in Intialisation");
    }
    
    
    //Set mode as 0x00
    _spi.write((0x03 << 2) | 0x02);
    _spi.write(0x00);
    wait(0.05);
    
    //Check DRDDY is low, if not read data
    _spi.write(0x07 << 2);
    status = _spi.write(0x00);
    if(status & 0x20){
        printf("Data to be read");
    }
    
    //Check OPStatus bit
    _spi.write(0x04 << 2);
    status = _spi.write(0x0);
    if(status & 0x01){
        printf("Not finished");
    }   
    
    //Activate new mode
    _spi.write((0x03 << 2) | 0x02);
    _spi.write(0x0A);
    
    
    
}


void SCP1000::SetMode(SCPMode mode){
    _CSB = 0;
    
  
    
    _CSB = 1;

}
    
float SCP1000::read(){
    _CSB = 0;

    if(_isReady() == 1){ 
        _spi.write(0x1F <<2);
        int PressureHighest = _spi.write(0x00);
        _spi.write(0x20 <<2);
        int PressureHigh = _spi.write(0x00);
        int Pressurelow = _spi.write(0x00);
        
        
        int pressureValue = Pressurelow | PressureHigh << 8 | (PressureHighest & 0x07) << 16;
        
        float pressure = ((float)pressureValue) / 4;
        
        _CSB = 1;
    
    
        return(pressure);
    }else{
        return(0);
    }
}
float SCP1000::readTemperature(){
    
    _CSB = 0;
    
    if(_isReady() == 1){ 
        //ready so now read
         _spi.write(0x21 << 2);
        int TempHigh = _spi.write(0x00);
        int TempLow = _spi.write(0x00);
        
        signed int temperatureValue = (TempLow | ((TempHigh & 0x1F) << 8));
        if(TempHigh & 0x20){
            //negative
            temperatureValue = -8192 + temperatureValue;
        }else{
            //positive
            
        }
        
        float temperature = ((float)temperatureValue) * 0.05;
        _CSB = 1;
        return(temperature);
    }else{
        return(0);
    }
}
    
 int SCP1000::_isReady(){
    //Depending on mode wait for it to be ready
    int status;
    _CSB = 0;
    do{
        _spi.write(0x07 << 2);
        status = _spi.write(0x00);
        //printf("waiting %i\n", status);
        wait(0.2);
        if(status & 0x10){
            //bit 4 high - real time error, interrupt has not been read in time - read DataRD16
            int temp;
            _spi.write(0x20 << 2);
            temp = _spi.write(0x00);
            temp = _spi.write(0x00);
        }
    }while(!(status & 0x20));
 return(1);
 }