LPS331_SPI.h

00001 /*
00002  *  I2C/SPI digital pressure sensor "LPS331AP" "LPS25H" library for SPI mode.
00003  *
00004  *  http://www.st.com/web/en/resource/technical/document/datasheet/DM00036196.pdf
00005  *
00006  *  Copyright(c) -2016 Toru OHTSUKA, 
00007  *  Copyright(c) -2013 unos@NYAMFG, 
00008  *  Released under the MIT License: http://mbed.org/license/mit
00009  *
00010  *  revision 1.2    07-Jul-2016     SPI version.
00011  *  revision 1.1    22-Oct-2013     Add multibyte read, Change temperature and pressure reading method.
00012  *  revision 1.0    20-Oct-2013     1st release, Does not support interrupts.
00013  */
00014 
00015 #ifndef LPS331_SPI_H
00016 #define LPS331_SPI_H
00017 
00018 #include "mbed.h"
00019 
00020 // SA0 status configuration values.
00021 #define LPS331_SPI_SA0_HIGH         true
00022 #define LPS331_SPI_SA0_LOW          false
00023 
00024 // Pressure configuration values.
00025 #define LPS331_SPI_PRESSURE_AVG_1   0x00
00026 #define LPS331_SPI_PRESSURE_AVG_2   0x01
00027 #define LPS331_SPI_PRESSURE_AVG_4   0x02
00028 #define LPS331_SPI_PRESSURE_AVG_8   0x03
00029 #define LPS331_SPI_PRESSURE_AVG_16  0x04
00030 #define LPS331_SPI_PRESSURE_AVG_32  0x05
00031 #define LPS331_SPI_PRESSURE_AVG_64  0x06
00032 #define LPS331_SPI_PRESSURE_AVG_128 0x07
00033 #define LPS331_SPI_PRESSURE_AVG_256 0x08
00034 #define LPS331_SPI_PRESSURE_AVG_384 0x09
00035 #define LPS331_SPI_PRESSURE_AVG_512 0x0a
00036 
00037 // Temperature configuration values.
00038 #define LPS331_SPI_TEMP_AVG_1       0x00
00039 #define LPS331_SPI_TEMP_AVG_2       0x01
00040 #define LPS331_SPI_TEMP_AVG_4       0x02
00041 #define LPS331_SPI_TEMP_AVG_8       0x03
00042 #define LPS331_SPI_TEMP_AVG_16      0x04
00043 #define LPS331_SPI_TEMP_AVG_32      0x05
00044 #define LPS331_SPI_TEMP_AVG_64      0x06
00045 #define LPS331_SPI_TEMP_AVG_128     0x07
00046 
00047 // Data Rate                                   Pressure / Temperature 
00048 #define LPS331_SPI_DATARATE_ONESHOT 0x00    // OneShot    OneShot
00049 #define LPS331_SPI_DATARATE_1HZ     0x01    // 1Hz        1Hz
00050 #define LPS331_SPI_DATARATE_7HZ     0x02    // 7Hz        1Hz
00051 #define LPS331_SPI_DATARATE_12_5HZ  0x03    // 12.5Hz     1Hz
00052 #define LPS331_SPI_DATARATE_25HZ    0x04    // 25Hz       1Hz
00053 #define LPS331_SPI_DATARATE_7HZ_T   0x05    // 7Hz        7Hz
00054 #define LPS331_SPI_DATARATE_12_5HZ_T 0x06   // 12.5Hz     12.5Hz
00055 #define LPS331_SPI_DATARATE_25HZ_T  0x07    // 25Hz       25Hz (*)
00056 // (*) Not allowed with PRESSURE_AVG_512 & TEMP_AVG_128.
00057 //     More information , see datasheet.
00058 
00059 // I2C Address.
00060 #define LPS331_SPI_ADDRESS_SA0_HIGH 0xba   
00061 #define LPS331_SPI_ADDRESS_SA0_LOW  0xb8
00062 
00063 class LPS331_SPI
00064 {
00065 public:
00066     LPS331_SPI(PinName mosi, PinName miso, PinName sclk, PinName cs);
00067     ~LPS331_SPI();
00068 
00069     char whoami();
00070     bool isLPS331();
00071     bool isLPS25H();
00072     
00073     void setResolution(char pressure_avg, char temp_avg);
00074     void setActive(bool is_active);
00075     void setDataRate(char datarate);
00076 
00077     void quickStart();
00078 
00079     float getPressure();
00080     float getTemperature();
00081 
00082     void _write(char subaddress, char data);
00083     char _read(char subaddress);
00084     void _read_multibyte(char startsubaddress, char* data, char count);
00085         
00086 private:
00087     SPI _spi;
00088     DigitalOut _cs;
00089     char _address;
00090     char _ctrlreg1;
00091 };
00092 
00093 
00094 #endif /* LPC331_SPI_H */
00095