ECE 2035 / MMA8452

ECE 2035

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MMA8452.h@0:53030e47347a, 2015-07-05 (annotated)

Committer:
ece2035ta
Date:
Sun Jul 05 16:35:08 2015 +0000
Revision:
0:53030e47347a
ECE 2035

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ece2035ta 0:53030e47347a 1 #pragma once
ece2035ta 0:53030e47347a 2
ece2035ta 0:53030e47347a 3 // Authors: Ashley Mills, Nicholas Herriot
ece2035ta 0:53030e47347a 4 /* Copyright (c) 2013 Vodafone, MIT License
ece2035ta 0:53030e47347a 5 *
ece2035ta 0:53030e47347a 6 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
ece2035ta 0:53030e47347a 7 * and associated documentation files (the "Software"), to deal in the Software without restriction,
ece2035ta 0:53030e47347a 8 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
ece2035ta 0:53030e47347a 9 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
ece2035ta 0:53030e47347a 10 * furnished to do so, subject to the following conditions:
ece2035ta 0:53030e47347a 11 *
ece2035ta 0:53030e47347a 12 * The above copyright notice and this permission notice shall be included in all copies or
ece2035ta 0:53030e47347a 13 * substantial portions of the Software.
ece2035ta 0:53030e47347a 14 *
ece2035ta 0:53030e47347a 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
ece2035ta 0:53030e47347a 16 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
ece2035ta 0:53030e47347a 17 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
ece2035ta 0:53030e47347a 18 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
ece2035ta 0:53030e47347a 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
ece2035ta 0:53030e47347a 20 */
ece2035ta 0:53030e47347a 21
ece2035ta 0:53030e47347a 22 // the SparkFun breakout board defaults to 1, set to 0 if SA0 jumper on the bottom of the board is set
ece2035ta 0:53030e47347a 23 // see the Table 10. I2C Device Address Sequence in Freescale MMA8452Q pdf
ece2035ta 0:53030e47347a 24
ece2035ta 0:53030e47347a 25 #include "mbed.h"
ece2035ta 0:53030e47347a 26
ece2035ta 0:53030e47347a 27 #define MMA8452_DEBUG 1
ece2035ta 0:53030e47347a 28
ece2035ta 0:53030e47347a 29 // More info on MCU Master address can be found on section 5.10.1 of http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MMA8452Q
ece2035ta 0:53030e47347a 30 #define SA0 1
ece2035ta 0:53030e47347a 31 #if SA0
ece2035ta 0:53030e47347a 32 #define MMA8452_ADDRESS 0x3A // 0x1D<<1 // SA0 is high, 0x1C if low -
ece2035ta 0:53030e47347a 33 #else
ece2035ta 0:53030e47347a 34 #define MMA8452_ADDRESS 0x38 // 0x1C<<1
ece2035ta 0:53030e47347a 35 #endif
ece2035ta 0:53030e47347a 36
ece2035ta 0:53030e47347a 37 // Register descriptions found in section 6 of pdf
ece2035ta 0:53030e47347a 38 #define MMA8452_STATUS 0x00 // Type 'read' : Status of the data registers
ece2035ta 0:53030e47347a 39 #define MMA8452_OUT_X_MSB 0x01 // Type 'read' : x axis - MSB of 2 byte sample
ece2035ta 0:53030e47347a 40 #define MMA8452_OUT_X_LSB 0x02 // Type 'read' : x axis - LSB of 2 byte sample
ece2035ta 0:53030e47347a 41 #define MMA8452_OUT_Y_MSB 0x03 // Type 'read' : y axis - MSB of 2 byte sample
ece2035ta 0:53030e47347a 42 #define MMA8452_OUT_Y_LSB 0x04 // Type 'read' : y axis - LSB of 2 byte sample
ece2035ta 0:53030e47347a 43 #define MMA8452_OUT_Z_MSB 0x05 // Type 'read' : z axis - MSB of 2 byte sample
ece2035ta 0:53030e47347a 44 #define MMA8452_OUT_Z_LSB 0x06 // Type 'read' : z axis - LSB of 2 byte sample
ece2035ta 0:53030e47347a 45
ece2035ta 0:53030e47347a 46 // register definitions
ece2035ta 0:53030e47347a 47 #define MMA8452_XYZ_DATA_CFG 0x0E
ece2035ta 0:53030e47347a 48
ece2035ta 0:53030e47347a 49 #define MMA8452_SYSMOD 0x0B // Type 'read' : This tells you if device is active, sleep or standy 0x00=STANDBY 0x01=WAKE 0x02=SLEEP
ece2035ta 0:53030e47347a 50 #define MMA8452_WHO_AM_I 0x0D // Type 'read' : This should return the device id of 0x2A
ece2035ta 0:53030e47347a 51
ece2035ta 0:53030e47347a 52 #define MMA8452_PL_STATUS 0x10 // Type 'read' : This shows portrait landscape mode orientation
ece2035ta 0:53030e47347a 53 #define MMA8452_PL_CFG 0x11 // Type 'read/write' : This allows portrait landscape configuration
ece2035ta 0:53030e47347a 54 #define MMA8452_PL_COUNT 0x12 // Type 'read' : This is the portraint landscape debounce counter
ece2035ta 0:53030e47347a 55 #define MMA8452_PL_BF_ZCOMP 0x13 // Type 'read' :
ece2035ta 0:53030e47347a 56 #define MMA8452_PL_THS_REG 0x14 // Type 'read' :
ece2035ta 0:53030e47347a 57
ece2035ta 0:53030e47347a 58 #define MMA8452_FF_MT_CFG 0X15 // Type 'read/write' : Freefaul motion functional block configuration
ece2035ta 0:53030e47347a 59 #define MMA8452_FF_MT_SRC 0X16 // Type 'read' : Freefaul motion event source register
ece2035ta 0:53030e47347a 60 #define MMA8452_FF_MT_THS 0X17 // Type 'read' : Freefaul motion threshold register
ece2035ta 0:53030e47347a 61 #define MMA8452_FF_COUNT 0X18 // Type 'read' : Freefaul motion debouce counter
ece2035ta 0:53030e47347a 62
ece2035ta 0:53030e47347a 63 #define MMA8452_ASLP_COUNT 0x29 // Type 'read/write' : Counter settings for auto sleep
ece2035ta 0:53030e47347a 64 #define MMA8452_CTRL_REG_1 0x2A // Type 'read/write' :
ece2035ta 0:53030e47347a 65 #define MMA8452_CTRL_REG_2 0x2B // Type 'read/write' :
ece2035ta 0:53030e47347a 66 #define MMA8452_CTRL_REG_3 0x2C // Type 'read/write' :
ece2035ta 0:53030e47347a 67 #define MMA8452_CTRL_REG_4 0x2D // Type 'read/write' :
ece2035ta 0:53030e47347a 68 #define MMA8452_CTRL_REG_5 0x2E // Type 'read/write' :
ece2035ta 0:53030e47347a 69
ece2035ta 0:53030e47347a 70 // Defined in table 13 of the Freescale PDF
ece2035ta 0:53030e47347a 71 /// xxx these all need to have better names
ece2035ta 0:53030e47347a 72 #define STANDBY 0x00 // State value returned after a SYSMOD request, it can be in state STANDBY, WAKE or SLEEP
ece2035ta 0:53030e47347a 73 #define WAKE 0x01 // State value returned after a SYSMOD request, it can be in state STANDBY, WAKE or SLEEP
ece2035ta 0:53030e47347a 74 #define SLEEP 0x02 // State value returned after a SYSMOD request, it can be in state STANDBY, WAKE or SLEEP
ece2035ta 0:53030e47347a 75 #define ACTIVE 0x01 // Stage value returned and set in Control Register 1, it can be STANDBY=00, or ACTIVE=01
ece2035ta 0:53030e47347a 76
ece2035ta 0:53030e47347a 77 #define TILT_STATUS 0x03 // Tilt Status (Read only)
ece2035ta 0:53030e47347a 78 #define SRST_STATUS 0x04 // Sample Rate Status Register (Read only)
ece2035ta 0:53030e47347a 79 #define SPCNT_STATUS 0x05 // Sleep Count Register (Read/Write)
ece2035ta 0:53030e47347a 80 #define INTSU_STATUS 0x06 // Interrupt Setup Register
ece2035ta 0:53030e47347a 81 #define MODE_STATUS 0x07 // Mode Register (Read/Write)
ece2035ta 0:53030e47347a 82 #define SR_STATUS 0x08 // Auto-Wake and Active Mode Portrait/Landscape Samples per Seconds Register (Read/Write)
ece2035ta 0:53030e47347a 83 #define PDET_STATUS 0x09 // Tap/Pulse Detection Register (Read/Write)
ece2035ta 0:53030e47347a 84 #define PD_STATUS 0xA // Tap/Pulse Debounce Count Register (Read/Write)
ece2035ta 0:53030e47347a 85
ece2035ta 0:53030e47347a 86 // masks for enabling/disabling standby
ece2035ta 0:53030e47347a 87 #define MMA8452_ACTIVE_MASK 0x01
ece2035ta 0:53030e47347a 88 #define MMA8452_STANDBY_MASK 0xFE
ece2035ta 0:53030e47347a 89
ece2035ta 0:53030e47347a 90 // mask for dynamic range reading and writing
ece2035ta 0:53030e47347a 91 #define MMA8452_DYNAMIC_RANGE_MASK 0xFC
ece2035ta 0:53030e47347a 92
ece2035ta 0:53030e47347a 93 // mask and shift for data rate reading and writing
ece2035ta 0:53030e47347a 94 #define MMA8452_DATA_RATE_MASK 0xC7
ece2035ta 0:53030e47347a 95 #define MMA8452_DATA_RATE_MASK_SHIFT 0x03
ece2035ta 0:53030e47347a 96
ece2035ta 0:53030e47347a 97 // mask and shift for general reading and writing
ece2035ta 0:53030e47347a 98 #define MMA8452_WRITE_MASK 0xFE
ece2035ta 0:53030e47347a 99 #define MMA8452_READ_MASK 0x01
ece2035ta 0:53030e47347a 100
ece2035ta 0:53030e47347a 101 // mask and shift for bit depth reading and writing
ece2035ta 0:53030e47347a 102 #define MMA8452_BIT_DEPTH_MASK 0xFD
ece2035ta 0:53030e47347a 103 #define MMA8452_BIT_DEPTH_MASK_SHIFT 0x01
ece2035ta 0:53030e47347a 104
ece2035ta 0:53030e47347a 105 // status masks and shifts
ece2035ta 0:53030e47347a 106 #define MMA8452_STATUS_ZYXDR_MASK 0x08
ece2035ta 0:53030e47347a 107 #define MMA8452_STATUS_ZDR_MASK 0x04
ece2035ta 0:53030e47347a 108 #define MMA8452_STATUS_YDR_MASK 0x02
ece2035ta 0:53030e47347a 109 #define MMA8452_STATUS_XDR_MASK 0x01
ece2035ta 0:53030e47347a 110
ece2035ta 0:53030e47347a 111 /**
ece2035ta 0:53030e47347a 112 * Wrapper for the MMA8452 I2C driven accelerometer.
ece2035ta 0:53030e47347a 113 */
ece2035ta 0:53030e47347a 114 class MMA8452 {
ece2035ta 0:53030e47347a 115
ece2035ta 0:53030e47347a 116 public:
ece2035ta 0:53030e47347a 117
ece2035ta 0:53030e47347a 118 enum DynamicRange {
ece2035ta 0:53030e47347a 119 DYNAMIC_RANGE_2G=0x00,
ece2035ta 0:53030e47347a 120 DYNAMIC_RANGE_4G,
ece2035ta 0:53030e47347a 121 DYNAMIC_RANGE_8G,
ece2035ta 0:53030e47347a 122 DYNAMIC_RANGE_UNKNOWN
ece2035ta 0:53030e47347a 123 };
ece2035ta 0:53030e47347a 124
ece2035ta 0:53030e47347a 125 enum BitDepth {
ece2035ta 0:53030e47347a 126 BIT_DEPTH_12=0x00,
ece2035ta 0:53030e47347a 127 BIT_DEPTH_8, // 1 sets fast read mode, hence the inversion
ece2035ta 0:53030e47347a 128 BIT_DEPTH_UNKNOWN
ece2035ta 0:53030e47347a 129 };
ece2035ta 0:53030e47347a 130
ece2035ta 0:53030e47347a 131 enum DataRateHz {
ece2035ta 0:53030e47347a 132 RATE_800=0x00,
ece2035ta 0:53030e47347a 133 RATE_400,
ece2035ta 0:53030e47347a 134 RATE_200,
ece2035ta 0:53030e47347a 135 RATE_100,
ece2035ta 0:53030e47347a 136 RATE_50,
ece2035ta 0:53030e47347a 137 RATE_12_5,
ece2035ta 0:53030e47347a 138 RATE_6_25,
ece2035ta 0:53030e47347a 139 RATE_1_563,
ece2035ta 0:53030e47347a 140 RATE_UNKNOWN
ece2035ta 0:53030e47347a 141 };
ece2035ta 0:53030e47347a 142
ece2035ta 0:53030e47347a 143 /**
ece2035ta 0:53030e47347a 144 * Create an accelerometer object connected to the specified I2C pins.
ece2035ta 0:53030e47347a 145 *
ece2035ta 0:53030e47347a 146 * @param sda I2C data port
ece2035ta 0:53030e47347a 147 * @param scl I2C clock port
ece2035ta 0:53030e47347a 148 * @param frequency
ece2035ta 0:53030e47347a 149 *
ece2035ta 0:53030e47347a 150 */
ece2035ta 0:53030e47347a 151 MMA8452(PinName sda, PinName scl, int frequency);
ece2035ta 0:53030e47347a 152
ece2035ta 0:53030e47347a 153 /// Destructor
ece2035ta 0:53030e47347a 154 ~MMA8452();
ece2035ta 0:53030e47347a 155
ece2035ta 0:53030e47347a 156 /**
ece2035ta 0:53030e47347a 157 * Puts the MMA8452 in active mode.
ece2035ta 0:53030e47347a 158 * @return 0 on success, 1 on failure.
ece2035ta 0:53030e47347a 159 */
ece2035ta 0:53030e47347a 160 int activate();
ece2035ta 0:53030e47347a 161
ece2035ta 0:53030e47347a 162 /**
ece2035ta 0:53030e47347a 163 * Puts the MMA8452 in standby.
ece2035ta 0:53030e47347a 164 * @return 0 on success, 1 on failure.
ece2035ta 0:53030e47347a 165 */
ece2035ta 0:53030e47347a 166 int standby();
ece2035ta 0:53030e47347a 167
ece2035ta 0:53030e47347a 168 /**
ece2035ta 0:53030e47347a 169 * Read the device ID from the accelerometer (should be 0x2a)
ece2035ta 0:53030e47347a 170 *
ece2035ta 0:53030e47347a 171 * @param dst pointer to store the ID
ece2035ta 0:53030e47347a 172 * @return 0 on success, 1 on failure.
ece2035ta 0:53030e47347a 173 */
ece2035ta 0:53030e47347a 174 int getDeviceID(char* dst);
ece2035ta 0:53030e47347a 175
ece2035ta 0:53030e47347a 176 /**
ece2035ta 0:53030e47347a 177 * Read the MMA8452 status register.
ece2035ta 0:53030e47347a 178 *
ece2035ta 0:53030e47347a 179 * @param dst pointer to store the register value.
ece2035ta 0:53030e47347a 180 * @ return 0 on success, 1 on failure.
ece2035ta 0:53030e47347a 181 */
ece2035ta 0:53030e47347a 182 int getStatus(char* dst);
ece2035ta 0:53030e47347a 183
ece2035ta 0:53030e47347a 184 /**
ece2035ta 0:53030e47347a 185 * Read the raw x, y, an z registers of the MMA8452 in one operation.
ece2035ta 0:53030e47347a 186 * All three registers are read sequentially and stored in the provided buffer.
ece2035ta 0:53030e47347a 187 * The stored values are signed 2's complement left-aligned 12 or 8 bit integers.
ece2035ta 0:53030e47347a 188 *
ece2035ta 0:53030e47347a 189 * @param dst The destination buffer. Note that this needs to be 3 bytes for
ece2035ta 0:53030e47347a 190 * BIT_DEPTH_8 and 6 bytes for BIT_DEPTH_12. It is upto the caller to ensure this.
ece2035ta 0:53030e47347a 191 * @return 0 for success, and 1 for failure
ece2035ta 0:53030e47347a 192 * @sa setBitDepth
ece2035ta 0:53030e47347a 193 */
ece2035ta 0:53030e47347a 194 int readXYZRaw(char *dst);
ece2035ta 0:53030e47347a 195
ece2035ta 0:53030e47347a 196 /// Read the raw x register into the provided buffer. @sa readXYZRaw
ece2035ta 0:53030e47347a 197 int readXRaw(char *dst);
ece2035ta 0:53030e47347a 198 /// Read the raw y register into the provided buffer. @sa readXYZRaw
ece2035ta 0:53030e47347a 199 int readYRaw(char *dst);
ece2035ta 0:53030e47347a 200 /// Read the raw z register into the provided buffer. @sa readXYZRaw
ece2035ta 0:53030e47347a 201 int readZRaw(char *dst);
ece2035ta 0:53030e47347a 202
ece2035ta 0:53030e47347a 203 /**
ece2035ta 0:53030e47347a 204 * Read the x, y, and z signed counts of the MMA8452 axes.
ece2035ta 0:53030e47347a 205 *
ece2035ta 0:53030e47347a 206 * Count resolution is either 8 bits or 12 bits, and the range is either +-2G, +-4G, or +-8G
ece2035ta 0:53030e47347a 207 * depending on settings. The number of counts per G are 1024, 512, 256 for 2,4, and 8 G
ece2035ta 0:53030e47347a 208 * respectively at 12 bit resolution and 64, 32, 16 for 2, 4, and 8 G respectively at
ece2035ta 0:53030e47347a 209 * 8 bit resolution.
ece2035ta 0:53030e47347a 210 *
ece2035ta 0:53030e47347a 211 * This function queries the MMA8452 and returns the signed counts for each axes.
ece2035ta 0:53030e47347a 212 *
ece2035ta 0:53030e47347a 213 * @param x Pointer to integer to store x count
ece2035ta 0:53030e47347a 214 * @param y Pointer to integer to store y count
ece2035ta 0:53030e47347a 215 * @param z Pointer to integer to store z count
ece2035ta 0:53030e47347a 216 * @return 0 on success, 1 on failure.
ece2035ta 0:53030e47347a 217 */
ece2035ta 0:53030e47347a 218 int readXYZCounts(int *x, int *y, int *z);
ece2035ta 0:53030e47347a 219
ece2035ta 0:53030e47347a 220 /// Read the x axes signed count. @sa readXYZCounts
ece2035ta 0:53030e47347a 221 int readXCount(int *x);
ece2035ta 0:53030e47347a 222 /// Read the y axes signed count. @sa readXYZCounts
ece2035ta 0:53030e47347a 223 int readYCount(int *y);
ece2035ta 0:53030e47347a 224 /// Read the z axes signed count. @sa readXYZCounts
ece2035ta 0:53030e47347a 225 int readZCount(int *z);
ece2035ta 0:53030e47347a 226
ece2035ta 0:53030e47347a 227 /**
ece2035ta 0:53030e47347a 228 * Read the x, y, and z accelerations measured in G.
ece2035ta 0:53030e47347a 229 *
ece2035ta 0:53030e47347a 230 * The measurement resolution is controlled via setBitDepth which can
ece2035ta 0:53030e47347a 231 * be 8 or 12, and by setDynamicRange, which can be +-2G, +-4G, or +-8G.
ece2035ta 0:53030e47347a 232 *
ece2035ta 0:53030e47347a 233 * @param x A pointer to the double to store the x acceleration in.
ece2035ta 0:53030e47347a 234 * @param y A pointer to the double to store the y acceleration in.
ece2035ta 0:53030e47347a 235 * @param z A pointer to the double to store the z acceleration in.
ece2035ta 0:53030e47347a 236 *
ece2035ta 0:53030e47347a 237 * @return 0 on success, 1 on failure.
ece2035ta 0:53030e47347a 238 */
ece2035ta 0:53030e47347a 239 int readXYZGravity(double *x, double *y, double *z);
ece2035ta 0:53030e47347a 240
ece2035ta 0:53030e47347a 241 /// Read the x gravity in G into the provided double pointer. @sa readXYZGravity
ece2035ta 0:53030e47347a 242 int readXGravity(double *x);
ece2035ta 0:53030e47347a 243 /// Read the y gravity in G into the provided double pointer. @sa readXYZGravity
ece2035ta 0:53030e47347a 244 int readYGravity(double *y);
ece2035ta 0:53030e47347a 245 /// Read the z gravity in G into the provided double pointer. @sa readXYZGravity
ece2035ta 0:53030e47347a 246 int readZGravity(double *z);
ece2035ta 0:53030e47347a 247
ece2035ta 0:53030e47347a 248 /// Returns 1 if data has been internally sampled (is available) for all axes since last read, 0 otherwise.
ece2035ta 0:53030e47347a 249 int isXYZReady();
ece2035ta 0:53030e47347a 250 /// Returns 1 if data has been internally sampled (is available) for the x-axis since last read, 0 otherwise.
ece2035ta 0:53030e47347a 251 int isXReady();
ece2035ta 0:53030e47347a 252 /// Returns 1 if data has been internally sampled (is available) for the y-axis since last read, 0 otherwise.
ece2035ta 0:53030e47347a 253 int isYReady();
ece2035ta 0:53030e47347a 254 /// Returns 1 if data has been internally sampled (is available) for the z-axis since last read, 0 otherwise.
ece2035ta 0:53030e47347a 255 int isZReady();
ece2035ta 0:53030e47347a 256
ece2035ta 0:53030e47347a 257 /**
ece2035ta 0:53030e47347a 258 * Reads a single byte from the specified MMA8452 register.
ece2035ta 0:53030e47347a 259 *
ece2035ta 0:53030e47347a 260 * @param addr The internal register address.
ece2035ta 0:53030e47347a 261 * @param dst The destination buffer address.
ece2035ta 0:53030e47347a 262 * @return 1 on success, 0 on failure.
ece2035ta 0:53030e47347a 263 */
ece2035ta 0:53030e47347a 264 int readRegister(char addr, char *dst);
ece2035ta 0:53030e47347a 265
ece2035ta 0:53030e47347a 266 /**
ece2035ta 0:53030e47347a 267 * Reads n bytes from the specified MMA8452 register.
ece2035ta 0:53030e47347a 268 *
ece2035ta 0:53030e47347a 269 * @param addr The internal register address.
ece2035ta 0:53030e47347a 270 * @param dst The destination buffer address.
ece2035ta 0:53030e47347a 271 * @param nbytes The number of bytes to read.
ece2035ta 0:53030e47347a 272 * @return 1 on success, 0 on failure.
ece2035ta 0:53030e47347a 273 */
ece2035ta 0:53030e47347a 274 int readRegister(char addr, char *dst, int nbytes);
ece2035ta 0:53030e47347a 275
ece2035ta 0:53030e47347a 276 /**
ece2035ta 0:53030e47347a 277 * Write to the specified MMA8452 register.
ece2035ta 0:53030e47347a 278 *
ece2035ta 0:53030e47347a 279 * @param addr The internal register address
ece2035ta 0:53030e47347a 280 * @param data Data byte to write
ece2035ta 0:53030e47347a 281 */
ece2035ta 0:53030e47347a 282 int writeRegister(char addr, char data);
ece2035ta 0:53030e47347a 283
ece2035ta 0:53030e47347a 284 /**
ece2035ta 0:53030e47347a 285 * Write a data buffer to the specified MMA8452 register.
ece2035ta 0:53030e47347a 286 *
ece2035ta 0:53030e47347a 287 * @param addr The internal register address
ece2035ta 0:53030e47347a 288 * @param data Pointer to data buffer to write
ece2035ta 0:53030e47347a 289 * @param nbytes The length of the data buffer to write
ece2035ta 0:53030e47347a 290 */
ece2035ta 0:53030e47347a 291 int writeRegister(char addr, char *data, int nbytes);
ece2035ta 0:53030e47347a 292
ece2035ta 0:53030e47347a 293 int setDynamicRange(DynamicRange range, int toggleActivation=1);
ece2035ta 0:53030e47347a 294 int setBitDepth(BitDepth depth, int toggleActivation=1);
ece2035ta 0:53030e47347a 295 int setDataRate(DataRateHz dataRate, int toggleActivation=1);
ece2035ta 0:53030e47347a 296
ece2035ta 0:53030e47347a 297 DynamicRange getDynamicRange();
ece2035ta 0:53030e47347a 298 DataRateHz getDataRate();
ece2035ta 0:53030e47347a 299 BitDepth getBitDepth();
ece2035ta 0:53030e47347a 300
ece2035ta 0:53030e47347a 301 #ifdef MMA8452_DEBUG
ece2035ta 0:53030e47347a 302 void debugRegister(char reg);
ece2035ta 0:53030e47347a 303 #endif
ece2035ta 0:53030e47347a 304
ece2035ta 0:53030e47347a 305 private:
ece2035ta 0:53030e47347a 306 /**
ece2035ta 0:53030e47347a 307 * Reads the specified register, applies the mask with logical AND, logical ORs the value
ece2035ta 0:53030e47347a 308 * and writes back the result to the register. If toggleActivation is set to true then the
ece2035ta 0:53030e47347a 309 * device is put in standby before the operation, and activated at the end.
ece2035ta 0:53030e47347a 310 * Setting it to false is useful for setting options on a device that you want to keep in
ece2035ta 0:53030e47347a 311 * standby.
ece2035ta 0:53030e47347a 312 */
ece2035ta 0:53030e47347a 313 int maskAndApplyRegister(char reg, char mask, char value, int toggleActivation);
ece2035ta 0:53030e47347a 314
ece2035ta 0:53030e47347a 315 /// Reads the specified register, applies the mask with logical AND, and writes the result back.
ece2035ta 0:53030e47347a 316 int logicalANDRegister(char addr, char mask);
ece2035ta 0:53030e47347a 317 /// Reads the specified register, applies the mask with logical OR, and writes the result back.
ece2035ta 0:53030e47347a 318 int logicalORRegister(char addr, char mask);
ece2035ta 0:53030e47347a 319 /// Reads the specified register, applies the mask with logical XOR, and writes the result back.
ece2035ta 0:53030e47347a 320 int logicalXORRegister(char addr, char mask);
ece2035ta 0:53030e47347a 321
ece2035ta 0:53030e47347a 322 /// Converts the 12-bit two's complement number in buf to a signed integer. Returns the integer.
ece2035ta 0:53030e47347a 323 int twelveBitToSigned(char *buf);
ece2035ta 0:53030e47347a 324 /// Converts the 8-bit two's complement number in buf to a signed integer. Returns the integer.
ece2035ta 0:53030e47347a 325 int eightBitToSigned(char *buf);
ece2035ta 0:53030e47347a 326
ece2035ta 0:53030e47347a 327 /// Converts a count to a gravity using the supplied countsPerG. Returns the gravity.
ece2035ta 0:53030e47347a 328 double convertCountToGravity(int count, int countsPerG);
ece2035ta 0:53030e47347a 329
ece2035ta 0:53030e47347a 330 /// Reads the register at addr, applies the mask with logical AND, and returns the result.
ece2035ta 0:53030e47347a 331 char getMaskedRegister(int addr, char mask);
ece2035ta 0:53030e47347a 332
ece2035ta 0:53030e47347a 333 /// Get the counts per G for the current settings of bit depth and dynamic range.
ece2035ta 0:53030e47347a 334 int getCountsPerG();
ece2035ta 0:53030e47347a 335
ece2035ta 0:53030e47347a 336 I2C _i2c;
ece2035ta 0:53030e47347a 337 int _frequency;
ece2035ta 0:53030e47347a 338 int _readAddress;
ece2035ta 0:53030e47347a 339 int _writeAddress;
ece2035ta 0:53030e47347a 340
ece2035ta 0:53030e47347a 341 BitDepth _bitDepth;
ece2035ta 0:53030e47347a 342 DynamicRange _dynamicRange;
ece2035ta 0:53030e47347a 343 };