Kenneth Adams / SCP1000

Library to interface the SCP1000 temperature and pressure sensor.

Dependents:   SCP1000_Example ku-make_sensor ku-make_sensor201302 SCP1000_Example ... more

SCP1000.cpp@6:70e36f2da425, 2010-10-05 (annotated)

Committer:
kadams6
Date:
Tue Oct 05 20:04:30 2010 +0000
Revision:
6:70e36f2da425
Parent:
5:8e06eb237dd2
Child:
7:61d2e698d988

        

        
Who changed what in which revision?

        

            
                
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/** \file





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 SCP1000 cpp file





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*/





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#include "SCP1000.h"





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SCP1000::SCP1000(PinName mosi, PinName miso, PinName sclk, PinName cs)





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    : m_spi(mosi, miso, sclk)





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    , m_cs(cs) {





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    m_cs=1;





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    m_spi.frequency(500000); // the fastest of the sensor





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    m_spi.format(8, 0); // duda son dos palabras de 8 bits? 





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    wait(0.5);





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    //------------------------------------------------





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    // pc.printf("RESET\r\n");





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    write_register(0x06,0x01);





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    wait(0.5);





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    // pc.printf("Initialize High Resolution Constant Reading Mode\r\n");





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    write_register(0x03,0x0A);





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    wait(0.5);





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}





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///Reads the pressure





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/**





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    Reads the pressure from the sensor





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    @return Pressure in pascals.





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*/





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unsigned long SCP1000::readPressure() {





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    unsigned long pressure_msb = read_register(PRESSURE);





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    pressure_msb &= 0x07;





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    unsigned long pressure_lsb = read_register16(PRESSURE_LSB);





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    unsigned long pressure = ((pressure_msb<<16)| pressure_lsb);





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    pressure /= 4;





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    return pressure;





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}





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float SCP1000::readTemperature() {





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    float temp_in = read_register16(TEMP);





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    temp_in /= 20;





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    return temp_in;





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}





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 char SCP1000::read_register(char register_name) {





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    register_name <<=2;





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    register_name &= 0xFC;





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    m_cs=0; //Select SPI device





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    m_spi.write(register_name); //Send register location





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    char register_value=m_spi.write(0x00);





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    m_cs=1;





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    return register_value;  





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}





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void SCP1000::write_register(char register_name, char register_value) {





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    register_name <<= 2;





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    register_name |= 0x02; //le estamos diciendo que escriba





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    m_cs=0; //Select SPI device





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    m_spi.write(register_name); //Send register location





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    m_spi.write(register_value); //Send value to record into register





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    m_cs=1;





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}





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float SCP1000::read_register16(char register_name) {   





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    register_name <<= 2;





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    register_name &= 0xFC; //Read command





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    m_cs=0; //Select SPI Device





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    m_spi.write(register_name); //Write byte to device





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    int in_byte1 = m_spi.write(0x00);    





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    int in_byte2 = m_spi.write(0x00);





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    m_cs=1;





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    float in_word= (in_byte1<<=8) | (in_byte2);   





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    return(in_word);





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}