Philip Holifield
from bbc microbit library
Dependencies: BLE_API mbed-dev-bin nRF51822
Fork of
microbit-dal
by 
Lancaster University
inc/drivers/MicroBitAccelerometer.h@38:1a9e8e5e23f2, 2016-07-13 (annotated)
- Committer:
- LancasterUniversity
- Date:
- Wed Jul 13 12:18:17 2016 +0100
- Revision:
- 38:1a9e8e5e23f2
- Parent:
- 1:8aa5cdb4ab67
- Child:
- 39:112df23f039f
Synchronized with git rev b5846f06
Author: Joe Finney
microbit: Fixed unreachable High-G gesture events [issue #109]
Ammended basic gesture recogniser to correclty generate threshold events for
high G forces (3G, 6G and 8G threshold events).
Also refined semantics such that events for any given impulse will be
generated for ALL thresholds below that below. e.g a 7G impulse will now raise
both the 3G and 6G threshold events.
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| Jonathan Austin |
1:8aa5cdb4ab67 | 1 | /* |
| Jonathan Austin |
1:8aa5cdb4ab67 | 2 | The MIT License (MIT) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 3 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 4 | Copyright (c) 2016 British Broadcasting Corporation. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 5 | This software is provided by Lancaster University by arrangement with the BBC. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 6 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 7 | Permission is hereby granted, free of charge, to any person obtaining a |
| Jonathan Austin |
1:8aa5cdb4ab67 | 8 | copy of this software and associated documentation files (the "Software"), |
| Jonathan Austin |
1:8aa5cdb4ab67 | 9 | to deal in the Software without restriction, including without limitation |
| Jonathan Austin |
1:8aa5cdb4ab67 | 10 | the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 11 | and/or sell copies of the Software, and to permit persons to whom the |
| Jonathan Austin |
1:8aa5cdb4ab67 | 12 | Software is furnished to do so, subject to the following conditions: |
| Jonathan Austin |
1:8aa5cdb4ab67 | 13 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 14 | The above copyright notice and this permission notice shall be included in |
| Jonathan Austin |
1:8aa5cdb4ab67 | 15 | all copies or substantial portions of the Software. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 16 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 17 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| Jonathan Austin |
1:8aa5cdb4ab67 | 18 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 19 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| Jonathan Austin |
1:8aa5cdb4ab67 | 20 | THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| Jonathan Austin |
1:8aa5cdb4ab67 | 21 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| Jonathan Austin |
1:8aa5cdb4ab67 | 22 | FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| Jonathan Austin |
1:8aa5cdb4ab67 | 23 | DEALINGS IN THE SOFTWARE. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 24 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 25 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 26 | #ifndef MICROBIT_ACCELEROMETER_H |
| Jonathan Austin |
1:8aa5cdb4ab67 | 27 | #define MICROBIT_ACCELEROMETER_H |
| Jonathan Austin |
1:8aa5cdb4ab67 | 28 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 29 | #include "mbed.h" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 30 | #include "MicroBitConfig.h" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 31 | #include "MicroBitComponent.h" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 32 | #include "MicroBitCoordinateSystem.h" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 33 | #include "MicroBitI2C.h" |
| Jonathan Austin |
1:8aa5cdb4ab67 | 34 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 35 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 36 | * Relevant pin assignments |
| Jonathan Austin |
1:8aa5cdb4ab67 | 37 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 38 | #define MICROBIT_PIN_ACCEL_DATA_READY P0_28 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 39 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 40 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 41 | * Status flags |
| Jonathan Austin |
1:8aa5cdb4ab67 | 42 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 43 | #define MICROBIT_ACCEL_PITCH_ROLL_VALID 0x02 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 44 | #define MICROBIT_ACCEL_ADDED_TO_IDLE 0x04 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 45 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 46 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 47 | * I2C constants |
| Jonathan Austin |
1:8aa5cdb4ab67 | 48 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 49 | #define MMA8653_DEFAULT_ADDR 0x3A |
| Jonathan Austin |
1:8aa5cdb4ab67 | 50 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 51 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 52 | * MMA8653 Register map (partial) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 53 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 54 | #define MMA8653_STATUS 0x00 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 55 | #define MMA8653_OUT_X_MSB 0x01 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 56 | #define MMA8653_WHOAMI 0x0D |
| Jonathan Austin |
1:8aa5cdb4ab67 | 57 | #define MMA8653_XYZ_DATA_CFG 0x0E |
| Jonathan Austin |
1:8aa5cdb4ab67 | 58 | #define MMA8653_CTRL_REG1 0x2A |
| Jonathan Austin |
1:8aa5cdb4ab67 | 59 | #define MMA8653_CTRL_REG2 0x2B |
| Jonathan Austin |
1:8aa5cdb4ab67 | 60 | #define MMA8653_CTRL_REG3 0x2C |
| Jonathan Austin |
1:8aa5cdb4ab67 | 61 | #define MMA8653_CTRL_REG4 0x2D |
| Jonathan Austin |
1:8aa5cdb4ab67 | 62 | #define MMA8653_CTRL_REG5 0x2E |
| Jonathan Austin |
1:8aa5cdb4ab67 | 63 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 64 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 65 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 66 | * MMA8653 constants |
| Jonathan Austin |
1:8aa5cdb4ab67 | 67 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 68 | #define MMA8653_WHOAMI_VAL 0x5A |
| Jonathan Austin |
1:8aa5cdb4ab67 | 69 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 70 | #define MMA8653_SAMPLE_RANGES 3 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 71 | #define MMA8653_SAMPLE_RATES 8 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 72 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 73 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 74 | * Accelerometer events |
| Jonathan Austin |
1:8aa5cdb4ab67 | 75 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 76 | #define MICROBIT_ACCELEROMETER_EVT_DATA_UPDATE 1 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 77 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 78 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 79 | * Gesture events |
| Jonathan Austin |
1:8aa5cdb4ab67 | 80 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 81 | #define MICROBIT_ACCELEROMETER_EVT_TILT_UP 1 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 82 | #define MICROBIT_ACCELEROMETER_EVT_TILT_DOWN 2 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 83 | #define MICROBIT_ACCELEROMETER_EVT_TILT_LEFT 3 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 84 | #define MICROBIT_ACCELEROMETER_EVT_TILT_RIGHT 4 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 85 | #define MICROBIT_ACCELEROMETER_EVT_FACE_UP 5 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 86 | #define MICROBIT_ACCELEROMETER_EVT_FACE_DOWN 6 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 87 | #define MICROBIT_ACCELEROMETER_EVT_FREEFALL 7 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 88 | #define MICROBIT_ACCELEROMETER_EVT_3G 8 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 89 | #define MICROBIT_ACCELEROMETER_EVT_6G 9 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 90 | #define MICROBIT_ACCELEROMETER_EVT_8G 10 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 91 | #define MICROBIT_ACCELEROMETER_EVT_SHAKE 11 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 92 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 93 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 94 | * Gesture recogniser constants |
| Jonathan Austin |
1:8aa5cdb4ab67 | 95 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 96 | #define MICROBIT_ACCELEROMETER_REST_TOLERANCE 200 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 97 | #define MICROBIT_ACCELEROMETER_TILT_TOLERANCE 200 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 98 | #define MICROBIT_ACCELEROMETER_FREEFALL_TOLERANCE 400 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 99 | #define MICROBIT_ACCELEROMETER_SHAKE_TOLERANCE 1000 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 100 | #define MICROBIT_ACCELEROMETER_3G_TOLERANCE 3072 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 101 | #define MICROBIT_ACCELEROMETER_6G_TOLERANCE 6144 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 102 | #define MICROBIT_ACCELEROMETER_8G_TOLERANCE 8192 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 103 | #define MICROBIT_ACCELEROMETER_GESTURE_DAMPING 10 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 104 | #define MICROBIT_ACCELEROMETER_SHAKE_DAMPING 10 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 105 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 106 | #define MICROBIT_ACCELEROMETER_REST_THRESHOLD (MICROBIT_ACCELEROMETER_REST_TOLERANCE * MICROBIT_ACCELEROMETER_REST_TOLERANCE) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 107 | #define MICROBIT_ACCELEROMETER_FREEFALL_THRESHOLD (MICROBIT_ACCELEROMETER_FREEFALL_TOLERANCE * MICROBIT_ACCELEROMETER_FREEFALL_TOLERANCE) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 108 | #define MICROBIT_ACCELEROMETER_3G_THRESHOLD (MICROBIT_ACCELEROMETER_3G_TOLERANCE * MICROBIT_ACCELEROMETER_3G_TOLERANCE) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 109 | #define MICROBIT_ACCELEROMETER_6G_THRESHOLD (MICROBIT_ACCELEROMETER_6G_TOLERANCE * MICROBIT_ACCELEROMETER_6G_TOLERANCE) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 110 | #define MICROBIT_ACCELEROMETER_8G_THRESHOLD (MICROBIT_ACCELEROMETER_8G_TOLERANCE * MICROBIT_ACCELEROMETER_8G_TOLERANCE) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 111 | #define MICROBIT_ACCELEROMETER_SHAKE_COUNT_THRESHOLD 4 |
| Jonathan Austin |
1:8aa5cdb4ab67 | 112 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 113 | struct MMA8653Sample |
| Jonathan Austin |
1:8aa5cdb4ab67 | 114 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 115 | int16_t x; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 116 | int16_t y; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 117 | int16_t z; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 118 | }; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 119 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 120 | struct MMA8653SampleRateConfig |
| Jonathan Austin |
1:8aa5cdb4ab67 | 121 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 122 | uint32_t sample_period; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 123 | uint8_t ctrl_reg1; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 124 | }; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 125 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 126 | struct MMA8653SampleRangeConfig |
| Jonathan Austin |
1:8aa5cdb4ab67 | 127 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 128 | uint8_t sample_range; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 129 | uint8_t xyz_data_cfg; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 130 | }; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 131 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 132 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 133 | extern const MMA8653SampleRangeConfig MMA8653SampleRange[]; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 134 | extern const MMA8653SampleRateConfig MMA8653SampleRate[]; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 135 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 136 | enum BasicGesture |
| Jonathan Austin |
1:8aa5cdb4ab67 | 137 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 138 | GESTURE_NONE, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 139 | GESTURE_UP, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 140 | GESTURE_DOWN, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 141 | GESTURE_LEFT, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 142 | GESTURE_RIGHT, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 143 | GESTURE_FACE_UP, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 144 | GESTURE_FACE_DOWN, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 145 | GESTURE_FREEFALL, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 146 | GESTURE_3G, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 147 | GESTURE_6G, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 148 | GESTURE_8G, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 149 | GESTURE_SHAKE |
| Jonathan Austin |
1:8aa5cdb4ab67 | 150 | }; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 151 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 152 | struct ShakeHistory |
| Jonathan Austin |
1:8aa5cdb4ab67 | 153 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 154 | uint16_t shaken:1, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 155 | x:1, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 156 | y:1, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 157 | z:1, |
| LancasterUniversity | 38:1a9e8e5e23f2 | 158 | unused, |
| LancasterUniversity | 38:1a9e8e5e23f2 | 159 | impulse_3, |
| LancasterUniversity | 38:1a9e8e5e23f2 | 160 | impulse_6, |
| LancasterUniversity | 38:1a9e8e5e23f2 | 161 | impulse_8, |
| Jonathan Austin |
1:8aa5cdb4ab67 | 162 | count:4, |
| LancasterUniversity | 38:1a9e8e5e23f2 | 163 | timer:4; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 164 | }; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 165 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 166 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 167 | * Class definition for MicroBit Accelerometer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 168 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 169 | * Represents an implementation of the Freescale MMA8653 3 axis accelerometer |
| Jonathan Austin |
1:8aa5cdb4ab67 | 170 | * Also includes basic data caching and on demand activation. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 171 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 172 | class MicroBitAccelerometer : public MicroBitComponent |
| Jonathan Austin |
1:8aa5cdb4ab67 | 173 | { |
| Jonathan Austin |
1:8aa5cdb4ab67 | 174 | uint16_t address; // I2C address of this accelerometer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 175 | uint16_t samplePeriod; // The time between samples, in milliseconds. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 176 | uint8_t sampleRange; // The sample range of the accelerometer in g. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 177 | MMA8653Sample sample; // The last sample read. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 178 | DigitalIn int1; // Data ready interrupt. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 179 | float pitch; // Pitch of the device, in radians. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 180 | MicroBitI2C& i2c; // The I2C interface to use. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 181 | float roll; // Roll of the device, in radians. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 182 | uint8_t sigma; // the number of ticks that the instantaneous gesture has been stable. |
| LancasterUniversity | 38:1a9e8e5e23f2 | 183 | uint8_t impulseSigma; // the number of ticks since an impulse event has been generated. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 184 | BasicGesture lastGesture; // the last, stable gesture recorded. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 185 | BasicGesture currentGesture; // the instantaneous, unfiltered gesture detected. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 186 | ShakeHistory shake; // State information needed to detect shake events. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 187 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 188 | public: |
| Jonathan Austin |
1:8aa5cdb4ab67 | 189 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 190 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 191 | * Constructor. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 192 | * Create a software abstraction of an accelerometer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 193 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 194 | * @param _i2c an instance of MicroBitI2C used to communicate with the onboard accelerometer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 195 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 196 | * @param address the default I2C address of the accelerometer. Defaults to: MMA8653_DEFAULT_ADDR. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 197 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 198 | * @param id the unique EventModel id of this component. Defaults to: MICROBIT_ID_ACCELEROMETER |
| Jonathan Austin |
1:8aa5cdb4ab67 | 199 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 200 | * @code |
| Jonathan Austin |
1:8aa5cdb4ab67 | 201 | * MicroBitI2C i2c = MicroBitI2C(I2C_SDA0, I2C_SCL0); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 202 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 203 | * MicroBitAccelerometer accelerometer = MicroBitAccelerometer(i2c); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 204 | * @endcode |
| Jonathan Austin |
1:8aa5cdb4ab67 | 205 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 206 | MicroBitAccelerometer(MicroBitI2C &_i2c, uint16_t address = MMA8653_DEFAULT_ADDR, uint16_t id = MICROBIT_ID_ACCELEROMETER); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 207 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 208 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 209 | * Configures the accelerometer for G range and sample rate defined |
| Jonathan Austin |
1:8aa5cdb4ab67 | 210 | * in this object. The nearest values are chosen to those defined |
| Jonathan Austin |
1:8aa5cdb4ab67 | 211 | * that are supported by the hardware. The instance variables are then |
| Jonathan Austin |
1:8aa5cdb4ab67 | 212 | * updated to reflect reality. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 213 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 214 | * @return MICROBIT_OK on success, MICROBIT_I2C_ERROR if the accelerometer could not be configured. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 215 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 216 | int configure(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 217 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 218 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 219 | * Reads the acceleration data from the accelerometer, and stores it in our buffer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 220 | * This only happens if the accelerometer indicates that it has new data via int1. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 221 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 222 | * On first use, this member function will attempt to add this component to the |
| Jonathan Austin |
1:8aa5cdb4ab67 | 223 | * list of fiber components in order to constantly update the values stored |
| Jonathan Austin |
1:8aa5cdb4ab67 | 224 | * by this object. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 225 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 226 | * This technique is called lazy instantiation, and it means that we do not |
| Jonathan Austin |
1:8aa5cdb4ab67 | 227 | * obtain the overhead from non-chalantly adding this component to fiber components. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 228 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 229 | * @return MICROBIT_OK on success, MICROBIT_I2C_ERROR if the read request fails. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 230 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 231 | int updateSample(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 232 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 233 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 234 | * Attempts to set the sample rate of the accelerometer to the specified value (in ms). |
| Jonathan Austin |
1:8aa5cdb4ab67 | 235 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 236 | * @param period the requested time between samples, in milliseconds. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 237 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 238 | * @return MICROBIT_OK on success, MICROBIT_I2C_ERROR is the request fails. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 239 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 240 | * @code |
| Jonathan Austin |
1:8aa5cdb4ab67 | 241 | * // sample rate is now 20 ms. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 242 | * accelerometer.setPeriod(20); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 243 | * @endcode |
| Jonathan Austin |
1:8aa5cdb4ab67 | 244 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 245 | * @note The requested rate may not be possible on the hardware. In this case, the |
| Jonathan Austin |
1:8aa5cdb4ab67 | 246 | * nearest lower rate is chosen. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 247 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 248 | int setPeriod(int period); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 249 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 250 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 251 | * Reads the currently configured sample rate of the accelerometer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 252 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 253 | * @return The time between samples, in milliseconds. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 254 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 255 | int getPeriod(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 256 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 257 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 258 | * Attempts to set the sample range of the accelerometer to the specified value (in g). |
| Jonathan Austin |
1:8aa5cdb4ab67 | 259 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 260 | * @param range The requested sample range of samples, in g. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 261 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 262 | * @return MICROBIT_OK on success, MICROBIT_I2C_ERROR is the request fails. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 263 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 264 | * @code |
| Jonathan Austin |
1:8aa5cdb4ab67 | 265 | * // the sample range of the accelerometer is now 8G. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 266 | * accelerometer.setRange(8); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 267 | * @endcode |
| Jonathan Austin |
1:8aa5cdb4ab67 | 268 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 269 | * @note The requested range may not be possible on the hardware. In this case, the |
| Jonathan Austin |
1:8aa5cdb4ab67 | 270 | * nearest lower range is chosen. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 271 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 272 | int setRange(int range); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 273 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 274 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 275 | * Reads the currently configured sample range of the accelerometer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 276 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 277 | * @return The sample range, in g. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 278 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 279 | int getRange(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 280 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 281 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 282 | * Attempts to read the 8 bit ID from the accelerometer, this can be used for |
| Jonathan Austin |
1:8aa5cdb4ab67 | 283 | * validation purposes. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 284 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 285 | * @return the 8 bit ID returned by the accelerometer, or MICROBIT_I2C_ERROR if the request fails. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 286 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 287 | * @code |
| Jonathan Austin |
1:8aa5cdb4ab67 | 288 | * accelerometer.whoAmI(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 289 | * @endcode |
| Jonathan Austin |
1:8aa5cdb4ab67 | 290 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 291 | int whoAmI(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 292 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 293 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 294 | * Reads the value of the X axis from the latest update retrieved from the accelerometer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 295 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 296 | * @param system The coordinate system to use. By default, a simple cartesian system is provided. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 297 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 298 | * @return The force measured in the X axis, in milli-g. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 299 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 300 | * @code |
| Jonathan Austin |
1:8aa5cdb4ab67 | 301 | * accelerometer.getX(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 302 | * @endcode |
| Jonathan Austin |
1:8aa5cdb4ab67 | 303 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 304 | int getX(MicroBitCoordinateSystem system = SIMPLE_CARTESIAN); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 305 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 306 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 307 | * Reads the value of the Y axis from the latest update retrieved from the accelerometer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 308 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 309 | * @return The force measured in the Y axis, in milli-g. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 310 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 311 | * @code |
| Jonathan Austin |
1:8aa5cdb4ab67 | 312 | * accelerometer.getY(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 313 | * @endcode |
| Jonathan Austin |
1:8aa5cdb4ab67 | 314 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 315 | int getY(MicroBitCoordinateSystem system = SIMPLE_CARTESIAN); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 316 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 317 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 318 | * Reads the value of the Z axis from the latest update retrieved from the accelerometer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 319 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 320 | * @return The force measured in the Z axis, in milli-g. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 321 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 322 | * @code |
| Jonathan Austin |
1:8aa5cdb4ab67 | 323 | * accelerometer.getZ(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 324 | * @endcode |
| Jonathan Austin |
1:8aa5cdb4ab67 | 325 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 326 | int getZ(MicroBitCoordinateSystem system = SIMPLE_CARTESIAN); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 327 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 328 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 329 | * Provides a rotation compensated pitch of the device, based on the latest update retrieved from the accelerometer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 330 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 331 | * @return The pitch of the device, in degrees. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 332 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 333 | * @code |
| Jonathan Austin |
1:8aa5cdb4ab67 | 334 | * accelerometer.getPitch(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 335 | * @endcode |
| Jonathan Austin |
1:8aa5cdb4ab67 | 336 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 337 | int getPitch(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 338 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 339 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 340 | * Provides a rotation compensated pitch of the device, based on the latest update retrieved from the accelerometer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 341 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 342 | * @return The pitch of the device, in radians. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 343 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 344 | * @code |
| Jonathan Austin |
1:8aa5cdb4ab67 | 345 | * accelerometer.getPitchRadians(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 346 | * @endcode |
| Jonathan Austin |
1:8aa5cdb4ab67 | 347 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 348 | float getPitchRadians(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 349 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 350 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 351 | * Provides a rotation compensated roll of the device, based on the latest update retrieved from the accelerometer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 352 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 353 | * @return The roll of the device, in degrees. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 354 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 355 | * @code |
| Jonathan Austin |
1:8aa5cdb4ab67 | 356 | * accelerometer.getRoll(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 357 | * @endcode |
| Jonathan Austin |
1:8aa5cdb4ab67 | 358 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 359 | int getRoll(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 360 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 361 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 362 | * Provides a rotation compensated roll of the device, based on the latest update retrieved from the accelerometer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 363 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 364 | * @return The roll of the device, in radians. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 365 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 366 | * @code |
| Jonathan Austin |
1:8aa5cdb4ab67 | 367 | * accelerometer.getRollRadians(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 368 | * @endcode |
| Jonathan Austin |
1:8aa5cdb4ab67 | 369 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 370 | float getRollRadians(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 371 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 372 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 373 | * Retrieves the last recorded gesture. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 374 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 375 | * @return The last gesture that was detected. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 376 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 377 | * Example: |
| Jonathan Austin |
1:8aa5cdb4ab67 | 378 | * @code |
| Jonathan Austin |
1:8aa5cdb4ab67 | 379 | * MicroBitDisplay display; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 380 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 381 | * if (accelerometer.getGesture() == SHAKE) |
| Jonathan Austin |
1:8aa5cdb4ab67 | 382 | * display.scroll("SHAKE!"); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 383 | * @endcode |
| Jonathan Austin |
1:8aa5cdb4ab67 | 384 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 385 | BasicGesture getGesture(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 386 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 387 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 388 | * A periodic callback invoked by the fiber scheduler idle thread. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 389 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 390 | * Internally calls updateSample(). |
| Jonathan Austin |
1:8aa5cdb4ab67 | 391 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 392 | virtual void idleTick(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 393 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 394 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 395 | * Returns 0 or 1. 1 indicates data is waiting to be read, zero means data is not ready to be read. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 396 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 397 | * We check if any data is ready for reading by checking the interrupt flag on the accelerometer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 398 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 399 | virtual int isIdleCallbackNeeded(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 400 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 401 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 402 | * Destructor for MicroBitButton, where we deregister this instance from the array of fiber components. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 403 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 404 | ~MicroBitAccelerometer(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 405 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 406 | private: |
| Jonathan Austin |
1:8aa5cdb4ab67 | 407 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 408 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 409 | * Issues a standard, 2 byte I2C command write to the accelerometer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 410 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 411 | * Blocks the calling thread until complete. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 412 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 413 | * @param reg The address of the register to write to. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 414 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 415 | * @param value The value to write. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 416 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 417 | * @return MICROBIT_OK on success, MICROBIT_I2C_ERROR if the the write request failed. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 418 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 419 | int writeCommand(uint8_t reg, uint8_t value); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 420 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 421 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 422 | * Issues a read command, copying data into the specified buffer. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 423 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 424 | * Blocks the calling thread until complete. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 425 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 426 | * @param reg The address of the register to access. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 427 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 428 | * @param buffer Memory area to read the data into. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 429 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 430 | * @param length The number of bytes to read. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 431 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 432 | * @return MICROBIT_OK on success, MICROBIT_INVALID_PARAMETER or MICROBIT_I2C_ERROR if the the read request failed. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 433 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 434 | int readCommand(uint8_t reg, uint8_t* buffer, int length); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 435 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 436 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 437 | * Recalculate roll and pitch values for the current sample. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 438 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 439 | * @note We only do this at most once per sample, as the necessary trigonemteric functions are rather |
| Jonathan Austin |
1:8aa5cdb4ab67 | 440 | * heavyweight for a CPU without a floating point unit. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 441 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 442 | void recalculatePitchRoll(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 443 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 444 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 445 | * Updates the basic gesture recognizer. This performs instantaneous pose recognition, and also some low pass filtering to promote |
| Jonathan Austin |
1:8aa5cdb4ab67 | 446 | * stability. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 447 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 448 | void updateGesture(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 449 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 450 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 451 | * A service function. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 452 | * It calculates the current scalar acceleration of the device (x^2 + y^2 + z^2). |
| Jonathan Austin |
1:8aa5cdb4ab67 | 453 | * It does not, however, square root the result, as this is a relatively high cost operation. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 454 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 455 | * This is left to application code should it be needed. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 456 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 457 | * @return the sum of the square of the acceleration of the device across all axes. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 458 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 459 | int instantaneousAccelerationSquared(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 460 | |
| Jonathan Austin |
1:8aa5cdb4ab67 | 461 | /** |
| Jonathan Austin |
1:8aa5cdb4ab67 | 462 | * Service function. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 463 | * Determines a 'best guess' posture of the device based on instantaneous data. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 464 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 465 | * This makes no use of historic data, and forms this input to the filter implemented in updateGesture(). |
| Jonathan Austin |
1:8aa5cdb4ab67 | 466 | * |
| Jonathan Austin |
1:8aa5cdb4ab67 | 467 | * @return A 'best guess' of the current posture of the device, based on instanataneous data. |
| Jonathan Austin |
1:8aa5cdb4ab67 | 468 | */ |
| Jonathan Austin |
1:8aa5cdb4ab67 | 469 | BasicGesture instantaneousPosture(); |
| Jonathan Austin |
1:8aa5cdb4ab67 | 470 | }; |
| Jonathan Austin |
1:8aa5cdb4ab67 | 471 | |
| LancasterUniversity | 38:1a9e8e5e23f2 | 472 | #endif |