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/**
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* @section LICENSE
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* @section DESCRIPTION
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* Library to interface with the SCP1000 pressure and temperature sensor.
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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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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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} |
Kenneth Adams
SCP1000 Pressure Sensor