DHT22
Dependencies: DHT_HW3 SDFileSystem mbed
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Diff: MMA7455.h
- Revision:
- 0:97c2d4128ff3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MMA7455.h Thu Jul 20 09:05:08 2017 +0000 @@ -0,0 +1,93 @@ +#ifndef MMA7455_H +#define MMA7455_H + + +/** + * Freescale Accelerometer MMA7455. + */ +class MMA7455 { +public: + + enum Mode { + ModeStandby = 0, + ModeMeasurement = 1, + }; + + /** Acceleration range */ + enum Range { + Range_8g = 0, + Range_2g = 1, + Range_4g = 2 + }; + + /** + * Create an interface to the MMA7455 accelerometer + * + * @param sda I2C data line pin + * @param scl I2C clock line pin + */ + MMA7455(PinName sda, PinName scl); + + bool setMode(Mode mode); + bool setRange(Range range); + + bool read(int32_t& x, int32_t& y, int32_t& z); + + /** + * Calibrate for 0g, that is, calculate offset to achieve + * 0g values when accelerometer is placed on flat surface. + * + * Please make sure the accelerometer is placed on a flat surface before + * calling this function. + * + * @return true if request was successful; otherwise false + */ + bool calibrate(); + + /** + * Get calculated offset values. Offsets will be calculated by the + * calibrate() method. + * + * Use these values and put them in persistent storage to avoid + * having to calibrate the accelerometer after a reset/power cycle. + * + * @param xOff x offset is written to this argument + * @param yOff y offset is written to this argument + * @param zOff z offset is written to this argument + * + * @return true if request was successful; otherwise false + */ + bool getCalibrationOffsets(int32_t& xOff, int32_t& yOff, int32_t& zOff); + + /** + * Set calibration offset values. These values should normally + * at one point in time have been retrieved by calling the + * getCalibrationOffsets method. + * + * + * @param xOff x offset + * @param yOff y offset + * @param zOff z offset + * + * @return true if request was successful; otherwise false + */ + bool setCalibrationOffsets(int32_t xOff, int32_t yOff, int32_t zOff); + + + +private: + + I2C _i2c; + Mode _mode; + Range _range; + int32_t _xOff; + int32_t _yOff; + int32_t _zOff; + + int getStatus(); + int getModeControl(); + int setModeControl(uint8_t mctl); + +}; + +#endif