Library to interface the SCP1000 temperature and pressure sensor.
Dependents:
SCP1000_Example
ku-make_sensor
ku-make_sensor201302
SCP1000_Example
... more
SCP1000.h@3:4d8b8ca54451, 2010-10-05 (annotated)
- Committer:
- kadams6
- Date:
- Tue Oct 05 04:19:14 2010 +0000
- Revision:
- 3:4d8b8ca54451
- Parent:
-
2:fe7826024fd1
- Child:
- 4:295e118b6e85
Who changed what in which revision?
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| kadams6 |
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/** \file
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SCP1000 header file
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*/
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#ifndef _SCP1000_H
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#define _SCP1000_H
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#include "mbed.h"
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class SCP1000 {
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public:
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SCP1000(PinName mosi, PinName miso, PinName sclk, PinName cs)
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| kadams6 |
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: m_spi(mosi, miso, sclk)
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| kadams6 |
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, m_cs(cs) {
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m_cs=1;
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| kadams6 |
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m_spi.frequency(500000); // the fastest of the sensor
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| kadams6 |
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m_spi.format(8, 0); // duda son dos palabras de 8 bits?
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| kadams6 |
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wait(0.5);
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//------------------------------------------------
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// pc.printf("RESET\r\n");
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| kadams6 |
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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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| kadams6 |
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write_register(0x03,0x0A);
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wait(0.5);
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};
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~SCP1000() { /* empty */ };
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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 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 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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private:
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static const char PRESSURE = 0x1F; //Pressure 3 MSB
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static const char PRESSURE_LSB = 0x20; //Pressure 16 LSB
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static const char TEMP = 0x21; //16 bit temp
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SPI m_spi;
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DigitalOut m_cs;
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char 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 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 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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};
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};
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#endif // _SCP1000_H |
Kenneth Adams
SCP1000 Pressure Sensor