Library to interface the SCP1000 temperature and pressure sensor.

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

Committer:
kadams6
Date:
Fri Oct 08 17:39:06 2010 +0000
Revision:
7:61d2e698d988
Parent:
6:70e36f2da425
Child:
8:1049590388b6

        

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kadams6 6:70e36f2da425 1 /** \file
kadams6 7:61d2e698d988 2 SCP1000 source file
kadams6 6:70e36f2da425 3 */
kadams6 6:70e36f2da425 4
kadams6 4:295e118b6e85 5 #include "SCP1000.h"
kadams6 4:295e118b6e85 6
kadams6 5:8e06eb237dd2 7 SCP1000::SCP1000(PinName mosi, PinName miso, PinName sclk, PinName cs)
kadams6 4:295e118b6e85 8 : m_spi(mosi, miso, sclk)
kadams6 4:295e118b6e85 9 , m_cs(cs) {
kadams6 4:295e118b6e85 10 m_cs=1;
kadams6 4:295e118b6e85 11 m_spi.frequency(500000); // the fastest of the sensor
kadams6 4:295e118b6e85 12 m_spi.format(8, 0); // duda son dos palabras de 8 bits?
kadams6 4:295e118b6e85 13 wait(0.5);
kadams6 4:295e118b6e85 14 //------------------------------------------------
kadams6 4:295e118b6e85 15 // pc.printf("RESET\r\n");
kadams6 4:295e118b6e85 16 write_register(0x06,0x01);
kadams6 4:295e118b6e85 17 wait(0.5);
kadams6 4:295e118b6e85 18
kadams6 4:295e118b6e85 19 // pc.printf("Initialize High Resolution Constant Reading Mode\r\n");
kadams6 4:295e118b6e85 20 write_register(0x03,0x0A);
kadams6 4:295e118b6e85 21 wait(0.5);
kadams6 4:295e118b6e85 22 }
kadams6 4:295e118b6e85 23
kadams6 4:295e118b6e85 24 unsigned long SCP1000::readPressure() {
kadams6 4:295e118b6e85 25 unsigned long pressure_msb = read_register(PRESSURE);
kadams6 4:295e118b6e85 26 pressure_msb &= 0x07;
kadams6 4:295e118b6e85 27 unsigned long pressure_lsb = read_register16(PRESSURE_LSB);
kadams6 4:295e118b6e85 28 unsigned long pressure = ((pressure_msb<<16)| pressure_lsb);
kadams6 4:295e118b6e85 29 pressure /= 4;
kadams6 4:295e118b6e85 30
kadams6 4:295e118b6e85 31 return pressure;
kadams6 4:295e118b6e85 32 }
kadams6 4:295e118b6e85 33
kadams6 4:295e118b6e85 34 float SCP1000::readTemperature() {
kadams6 4:295e118b6e85 35 float temp_in = read_register16(TEMP);
kadams6 4:295e118b6e85 36 temp_in /= 20;
kadams6 4:295e118b6e85 37 return temp_in;
kadams6 4:295e118b6e85 38 }
kadams6 4:295e118b6e85 39
kadams6 4:295e118b6e85 40 char SCP1000::read_register(char register_name) {
kadams6 4:295e118b6e85 41 register_name <<=2;
kadams6 4:295e118b6e85 42 register_name &= 0xFC;
kadams6 4:295e118b6e85 43 m_cs=0; //Select SPI device
kadams6 4:295e118b6e85 44 m_spi.write(register_name); //Send register location
kadams6 4:295e118b6e85 45 char register_value=m_spi.write(0x00);
kadams6 4:295e118b6e85 46 m_cs=1;
kadams6 4:295e118b6e85 47 return register_value;
kadams6 4:295e118b6e85 48 }
kadams6 4:295e118b6e85 49
kadams6 4:295e118b6e85 50 void SCP1000::write_register(char register_name, char register_value) {
kadams6 4:295e118b6e85 51 register_name <<= 2;
kadams6 4:295e118b6e85 52 register_name |= 0x02; //le estamos diciendo que escriba
kadams6 4:295e118b6e85 53 m_cs=0; //Select SPI device
kadams6 4:295e118b6e85 54 m_spi.write(register_name); //Send register location
kadams6 4:295e118b6e85 55 m_spi.write(register_value); //Send value to record into register
kadams6 4:295e118b6e85 56 m_cs=1;
kadams6 4:295e118b6e85 57 }
kadams6 4:295e118b6e85 58
kadams6 4:295e118b6e85 59 float SCP1000::read_register16(char register_name) {
kadams6 4:295e118b6e85 60 register_name <<= 2;
kadams6 4:295e118b6e85 61 register_name &= 0xFC; //Read command
kadams6 4:295e118b6e85 62 m_cs=0; //Select SPI Device
kadams6 4:295e118b6e85 63 m_spi.write(register_name); //Write byte to device
kadams6 4:295e118b6e85 64 int in_byte1 = m_spi.write(0x00);
kadams6 4:295e118b6e85 65 int in_byte2 = m_spi.write(0x00);
kadams6 4:295e118b6e85 66 m_cs=1;
kadams6 4:295e118b6e85 67 float in_word= (in_byte1<<=8) | (in_byte2);
kadams6 4:295e118b6e85 68 return(in_word);
kadams6 4:295e118b6e85 69 }