heejeong koo / Mbed 2 deprecated mbed_project_HW3

DHT22

Dependencies:   DHT_HW3 SDFileSystem mbed

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MMA7455.h@0:97c2d4128ff3, 2017-07-20 (annotated)

Committer:
david8251
Date:
Thu Jul 20 09:05:08 2017 +0000
Revision:
0:97c2d4128ff3
DHT

Who changed what in which revision?

UserRevisionLine numberNew contents of line
david8251 0:97c2d4128ff3 1 #ifndef MMA7455_H
david8251 0:97c2d4128ff3 2 #define MMA7455_H
david8251 0:97c2d4128ff3 3
david8251 0:97c2d4128ff3 4
david8251 0:97c2d4128ff3 5 /**
david8251 0:97c2d4128ff3 6 * Freescale Accelerometer MMA7455.
david8251 0:97c2d4128ff3 7 */
david8251 0:97c2d4128ff3 8 class MMA7455 {
david8251 0:97c2d4128ff3 9 public:
david8251 0:97c2d4128ff3 10
david8251 0:97c2d4128ff3 11 enum Mode {
david8251 0:97c2d4128ff3 12 ModeStandby = 0,
david8251 0:97c2d4128ff3 13 ModeMeasurement = 1,
david8251 0:97c2d4128ff3 14 };
david8251 0:97c2d4128ff3 15
david8251 0:97c2d4128ff3 16 /** Acceleration range */
david8251 0:97c2d4128ff3 17 enum Range {
david8251 0:97c2d4128ff3 18 Range_8g = 0,
david8251 0:97c2d4128ff3 19 Range_2g = 1,
david8251 0:97c2d4128ff3 20 Range_4g = 2
david8251 0:97c2d4128ff3 21 };
david8251 0:97c2d4128ff3 22
david8251 0:97c2d4128ff3 23 /**
david8251 0:97c2d4128ff3 24 * Create an interface to the MMA7455 accelerometer
david8251 0:97c2d4128ff3 25 *
david8251 0:97c2d4128ff3 26 * @param sda I2C data line pin
david8251 0:97c2d4128ff3 27 * @param scl I2C clock line pin
david8251 0:97c2d4128ff3 28 */
david8251 0:97c2d4128ff3 29 MMA7455(PinName sda, PinName scl);
david8251 0:97c2d4128ff3 30
david8251 0:97c2d4128ff3 31 bool setMode(Mode mode);
david8251 0:97c2d4128ff3 32 bool setRange(Range range);
david8251 0:97c2d4128ff3 33
david8251 0:97c2d4128ff3 34 bool read(int32_t& x, int32_t& y, int32_t& z);
david8251 0:97c2d4128ff3 35
david8251 0:97c2d4128ff3 36 /**
david8251 0:97c2d4128ff3 37 * Calibrate for 0g, that is, calculate offset to achieve
david8251 0:97c2d4128ff3 38 * 0g values when accelerometer is placed on flat surface.
david8251 0:97c2d4128ff3 39 *
david8251 0:97c2d4128ff3 40 * Please make sure the accelerometer is placed on a flat surface before
david8251 0:97c2d4128ff3 41 * calling this function.
david8251 0:97c2d4128ff3 42 *
david8251 0:97c2d4128ff3 43 * @return true if request was successful; otherwise false
david8251 0:97c2d4128ff3 44 */
david8251 0:97c2d4128ff3 45 bool calibrate();
david8251 0:97c2d4128ff3 46
david8251 0:97c2d4128ff3 47 /**
david8251 0:97c2d4128ff3 48 * Get calculated offset values. Offsets will be calculated by the
david8251 0:97c2d4128ff3 49 * calibrate() method.
david8251 0:97c2d4128ff3 50 *
david8251 0:97c2d4128ff3 51 * Use these values and put them in persistent storage to avoid
david8251 0:97c2d4128ff3 52 * having to calibrate the accelerometer after a reset/power cycle.
david8251 0:97c2d4128ff3 53 *
david8251 0:97c2d4128ff3 54 * @param xOff x offset is written to this argument
david8251 0:97c2d4128ff3 55 * @param yOff y offset is written to this argument
david8251 0:97c2d4128ff3 56 * @param zOff z offset is written to this argument
david8251 0:97c2d4128ff3 57 *
david8251 0:97c2d4128ff3 58 * @return true if request was successful; otherwise false
david8251 0:97c2d4128ff3 59 */
david8251 0:97c2d4128ff3 60 bool getCalibrationOffsets(int32_t& xOff, int32_t& yOff, int32_t& zOff);
david8251 0:97c2d4128ff3 61
david8251 0:97c2d4128ff3 62 /**
david8251 0:97c2d4128ff3 63 * Set calibration offset values. These values should normally
david8251 0:97c2d4128ff3 64 * at one point in time have been retrieved by calling the
david8251 0:97c2d4128ff3 65 * getCalibrationOffsets method.
david8251 0:97c2d4128ff3 66 *
david8251 0:97c2d4128ff3 67 *
david8251 0:97c2d4128ff3 68 * @param xOff x offset
david8251 0:97c2d4128ff3 69 * @param yOff y offset
david8251 0:97c2d4128ff3 70 * @param zOff z offset
david8251 0:97c2d4128ff3 71 *
david8251 0:97c2d4128ff3 72 * @return true if request was successful; otherwise false
david8251 0:97c2d4128ff3 73 */
david8251 0:97c2d4128ff3 74 bool setCalibrationOffsets(int32_t xOff, int32_t yOff, int32_t zOff);
david8251 0:97c2d4128ff3 75
david8251 0:97c2d4128ff3 76
david8251 0:97c2d4128ff3 77
david8251 0:97c2d4128ff3 78 private:
david8251 0:97c2d4128ff3 79
david8251 0:97c2d4128ff3 80 I2C _i2c;
david8251 0:97c2d4128ff3 81 Mode _mode;
david8251 0:97c2d4128ff3 82 Range _range;
david8251 0:97c2d4128ff3 83 int32_t _xOff;
david8251 0:97c2d4128ff3 84 int32_t _yOff;
david8251 0:97c2d4128ff3 85 int32_t _zOff;
david8251 0:97c2d4128ff3 86
david8251 0:97c2d4128ff3 87 int getStatus();
david8251 0:97c2d4128ff3 88 int getModeControl();
david8251 0:97c2d4128ff3 89 int setModeControl(uint8_t mctl);
david8251 0:97c2d4128ff3 90
david8251 0:97c2d4128ff3 91 };
david8251 0:97c2d4128ff3 92
david8251 0:97c2d4128ff3 93 #endif