LPS331_I2C.h

00001 /*
00002  *  I2C/SPI digital pressure sensor "LPS331AP" library for I2C mode.
00003  *
00004  *  http://www.st.com/web/en/resource/technical/document/datasheet/DM00036196.pdf
00005  *
00006  *  Copyright(c) -2013 unos@NYAMFG, 
00007  *  Released under the MIT License: http://mbed.org/license/mit
00008  *
00009  *  revision 1.1    22-Oct-2013     Add multibyte read, Change temperature and pressure reading method.
00010  *  revision 1.0    20-Oct-2013     1st release, Does not support interrupts.
00011  */
00012 
00013 #ifndef LPS331_I2C_H
00014 #define LPS331_I2C_H
00015 
00016 #include "mbed.h"
00017 
00018 // SA0 status configuration values.
00019 #define LPS331_I2C_SA0_HIGH         true
00020 #define LPS331_I2C_SA0_LOW          false
00021 
00022 // Pressure configuration values.
00023 #define LPS331_I2C_PRESSURE_AVG_1   0x00
00024 #define LPS331_I2C_PRESSURE_AVG_2   0x01
00025 #define LPS331_I2C_PRESSURE_AVG_4   0x02
00026 #define LPS331_I2C_PRESSURE_AVG_8   0x03
00027 #define LPS331_I2C_PRESSURE_AVG_16  0x04
00028 #define LPS331_I2C_PRESSURE_AVG_32  0x05
00029 #define LPS331_I2C_PRESSURE_AVG_64  0x06
00030 #define LPS331_I2C_PRESSURE_AVG_128 0x07
00031 #define LPS331_I2C_PRESSURE_AVG_256 0x08
00032 #define LPS331_I2C_PRESSURE_AVG_384 0x09
00033 #define LPS331_I2C_PRESSURE_AVG_512 0x0a
00034 
00035 // Temperature configuration values.
00036 #define LPS331_I2C_TEMP_AVG_1       0x00
00037 #define LPS331_I2C_TEMP_AVG_2       0x01
00038 #define LPS331_I2C_TEMP_AVG_4       0x02
00039 #define LPS331_I2C_TEMP_AVG_8       0x03
00040 #define LPS331_I2C_TEMP_AVG_16      0x04
00041 #define LPS331_I2C_TEMP_AVG_32      0x05
00042 #define LPS331_I2C_TEMP_AVG_64      0x06
00043 #define LPS331_I2C_TEMP_AVG_128     0x07
00044 
00045 // Data Rate                                   Pressure / Temperature 
00046 #define LPS331_I2C_DATARATE_ONESHOT 0x00    // OneShot    OneShot
00047 #define LPS331_I2C_DATARATE_1HZ     0x01    // 1Hz        1Hz
00048 #define LPS331_I2C_DATARATE_7HZ     0x02    // 7Hz        1Hz
00049 #define LPS331_I2C_DATARATE_12_5HZ  0x03    // 12.5Hz     1Hz
00050 #define LPS331_I2C_DATARATE_25HZ    0x04    // 25Hz       1Hz
00051 #define LPS331_I2C_DATARATE_7HZ_T   0x05    // 7Hz        7Hz
00052 #define LPS331_I2C_DATARATE_12_5HZ_T 0x06   // 12.5Hz     12.5Hz
00053 #define LPS331_I2C_DATARATE_25HZ_T  0x07    // 25Hz       25Hz (*)
00054 // (*) Not allowed with PRESSURE_AVG_512 & TEMP_AVG_128.
00055 //     More information , see datasheet.
00056 
00057 // I2C Address.
00058 #define LPS331_I2C_ADDRESS_SA0_HIGH 0xba   
00059 #define LPS331_I2C_ADDRESS_SA0_LOW  0xb8
00060 
00061 class LPS331_I2C
00062 {
00063 public:
00064     LPS331_I2C(PinName sda, PinName scl, bool sa0);
00065     ~LPS331_I2C();
00066 
00067     char whoami();
00068     bool isAvailable();
00069     
00070     void setResolution(char pressure_avg, char temp_avg);
00071     void setActive(bool is_active);
00072     void setDataRate(char datarate);
00073 
00074     float getPressure();
00075     float getTemperature();
00076 
00077     void _write(char subaddress, char data);
00078     char _read(char subaddress);
00079     void _read_multibyte(char startsubaddress, char* data, char count);
00080         
00081 private:
00082     I2C _i2c;
00083     char _address;
00084     char _ctrlreg1;
00085 };
00086 
00087 
00088 #endif /* LPC331_I2C_H */
00089