Ashley Mills / MMA8452

Library for driving the MMA8452 accelerometer over I2C

Dependents:   MMA8452_Test MMA8452_Demo Dualing_Tanks IMU-Controlled_MP3_Player ... more

Here is a simple example:

#include "mbed.h"
#include "MMA8452.h"

int main() {
   Serial pc(USBTX,USBRX);
   pc.baud(115200);
   double x = 0, y = 0, z = 0;

   MMA8452 acc(p28, p27, 40000);
   acc.setBitDepth(MMA8452::BIT_DEPTH_12);
   acc.setDynamicRange(MMA8452::DYNAMIC_RANGE_4G);
   acc.setDataRate(MMA8452::RATE_100);
   
   while(1) {
      if(!acc.isXYZReady()) {
         wait(0.01);
         continue;
      }
      acc.readXYZGravity(&x,&y,&z);
      pc.printf("Gravities: %lf %lf %lf\r\n",x,y,z);
   }
}

An easy way to test that this actually works is to run the loop above and hold the MMA8452 parallel to the ground along the respective axis (and upsidedown in each axis). You will see 1G on the respective axis and 0G on the others.

MMA8452.h@11:dfd1e0afcb7b, 2014-03-04 (annotated)

Committer:
ashleymills
Date:
Tue Mar 04 16:23:40 2014 +0000
Revision:
11:dfd1e0afcb7b
Parent:
10:ca9ba7ad4e94
Child:
12:172540ff6b8b
Started a major rewrite of this library.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ashleymills 10:ca9ba7ad4e94 1 // Author: Nicholas Herriot, Ashley Mills
nherriot 0:bcf2aa85d7f9 2 /* Copyright (c) 2013 Vodafone, MIT License
nherriot 0:bcf2aa85d7f9 3 *
nherriot 0:bcf2aa85d7f9 4 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
nherriot 0:bcf2aa85d7f9 5 * and associated documentation files (the "Software"), to deal in the Software without restriction,
nherriot 0:bcf2aa85d7f9 6 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
nherriot 0:bcf2aa85d7f9 7 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
nherriot 0:bcf2aa85d7f9 8 * furnished to do so, subject to the following conditions:
nherriot 0:bcf2aa85d7f9 9 *
nherriot 0:bcf2aa85d7f9 10 * The above copyright notice and this permission notice shall be included in all copies or
nherriot 0:bcf2aa85d7f9 11 * substantial portions of the Software.
nherriot 0:bcf2aa85d7f9 12 *
nherriot 0:bcf2aa85d7f9 13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
nherriot 0:bcf2aa85d7f9 14 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
nherriot 0:bcf2aa85d7f9 15 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
nherriot 0:bcf2aa85d7f9 16 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
nherriot 0:bcf2aa85d7f9 17 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
nherriot 0:bcf2aa85d7f9 18 */
nherriot 0:bcf2aa85d7f9 19
nherriot 0:bcf2aa85d7f9 20 // the SparkFun breakout board defaults to 1, set to 0 if SA0 jumper on the bottom of the board is set
nherriot 0:bcf2aa85d7f9 21 // see the Table 10. I2C Device Address Sequence in Freescale MMA8452Q pdf
nherriot 0:bcf2aa85d7f9 22
ashleymills 11:dfd1e0afcb7b 23
ashleymills 11:dfd1e0afcb7b 24 #define DBG(...) pc.printf(__VA_ARGS__); pc.printf("\r\n");
ashleymills 11:dfd1e0afcb7b 25 #define DBGX(...) pc.print(__VA_ARGS__);
ashleymills 11:dfd1e0afcb7b 26
nherriot 0:bcf2aa85d7f9 27 //#define SA0 1
nherriot 0:bcf2aa85d7f9 28 //#if SA0
nherriot 0:bcf2aa85d7f9 29 //#define MMA8452_ADDRESS 0x3A // SA0 is high, 0x1C if low - it should be 0x1D, but we shift now to save shifting in the code
nherriot 0:bcf2aa85d7f9 30 //#else
nherriot 0:bcf2aa85d7f9 31 //#define MMA8452_ADDRESS 0x1C
nherriot 0:bcf2aa85d7f9 32 //#endif
nherriot 0:bcf2aa85d7f9 33
nherriot 0:bcf2aa85d7f9 34 //#ifndef MBED_MMA8452
nherriot 0:bcf2aa85d7f9 35
nherriot 0:bcf2aa85d7f9 36 //#define MBED_MMA8452
nherriot 0:bcf2aa85d7f9 37
nherriot 0:bcf2aa85d7f9 38 #include "mbed.h"
nherriot 0:bcf2aa85d7f9 39
nherriot 0:bcf2aa85d7f9 40 /** Accelerometer MMA8452 class
nherriot 0:bcf2aa85d7f9 41 *
nherriot 0:bcf2aa85d7f9 42 * Example:
nherriot 0:bcf2aa85d7f9 43 * @code
nherriot 0:bcf2aa85d7f9 44 *
nherriot 0:bcf2aa85d7f9 45 * #include "mbed.h"
nherriot 0:bcf2aa85d7f9 46 * #include "MMA8452.h"
nherriot 0:bcf2aa85d7f9 47 *
nherriot 0:bcf2aa85d7f9 48 *
nherriot 0:bcf2aa85d7f9 49 * Accelerometer_MMA8452 Acc(p28, p27);
nherriot 0:bcf2aa85d7f9 50 * serial pc(USBTX, USBRX);
nherriot 0:bcf2aa85d7f9 51 *
nherriot 0:bcf2aa85d7f9 52 * int main()
nherriot 0:bcf2aa85d7f9 53 * {
nherriot 0:bcf2aa85d7f9 54 * Acc.init();
nherriot 0:bcf2aa85d7f9 55 * while(1)
nherriot 0:bcf2aa85d7f9 56 * {
nherriot 0:bcf2aa85d7f9 57 * int x=0, y=0, z=0;
nherriot 0:bcf2aa85d7f9 58 * Acc.read_Tilt(&x, &y, &z);
nherriot 0:bcf2aa85d7f9 59 * pc.printf("Tilt x: %2.2f degree \n", x); // Print the tilt orientation of the X axis
nherriot 0:bcf2aa85d7f9 60 * pc.printf("Tilt y: %2.2f degree \n", y); // Print the tilt orientation of the Y axis
nherriot 0:bcf2aa85d7f9 61 * pc.printf("Tilt z: %2.2f degree \n", z); // Print the tilt orientation of the Z axis
nherriot 0:bcf2aa85d7f9 62 * wait(1);
nherriot 0:bcf2aa85d7f9 63 * }
nherriot 0:bcf2aa85d7f9 64 * }
nherriot 0:bcf2aa85d7f9 65 * @endcode
nherriot 0:bcf2aa85d7f9 66 */
nherriot 0:bcf2aa85d7f9 67
nherriot 0:bcf2aa85d7f9 68 // 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
nherriot 0:bcf2aa85d7f9 69 #define SA0 1
nherriot 0:bcf2aa85d7f9 70 #if SA0
ashleymills 11:dfd1e0afcb7b 71 #define MMA8452_ADDRESS 0x3A // 0x1D<<1 // SA0 is high, 0x1C if low -
nherriot 0:bcf2aa85d7f9 72 #else
ashleymills 11:dfd1e0afcb7b 73 #define MMA8452_ADDRESS 0x38 // 0x1C<<1
nherriot 0:bcf2aa85d7f9 74 #endif
nherriot 0:bcf2aa85d7f9 75
nherriot 0:bcf2aa85d7f9 76 // Register descriptions found in section 6 of pdf
nherriot 0:bcf2aa85d7f9 77 #define STATUS 0x00 // Type 'read' : Real time status, should return 0x00
nherriot 0:bcf2aa85d7f9 78 #define OUT_X_MSB 0x01 // Type 'read' : x axis - 8 most significatn bit of a 12 bit sample
nherriot 0:bcf2aa85d7f9 79 #define OUT_X_LSB 0x02 // Type 'read' : x axis - 4 least significatn bit of a 12 bit sample
nherriot 0:bcf2aa85d7f9 80 #define OUT_Y_MSB 0x03 // Type 'read' : y axis - 8 most significatn bit of a 12 bit sample
nherriot 0:bcf2aa85d7f9 81 #define OUT_Y_LSB 0x04 // Type 'read' : y axis - 4 least significatn bit of a 12 bit sample
nherriot 0:bcf2aa85d7f9 82 #define OUT_Z_MSB 0x05 // Type 'read' : z axis - 8 most significatn bit of a 12 bit sample
nherriot 0:bcf2aa85d7f9 83 #define OUT_Z_LSB 0x06 // Type 'read' : z axis - 4 least significatn bit of a 12 bit sample
nherriot 0:bcf2aa85d7f9 84
nherriot 0:bcf2aa85d7f9 85 #define SYSMOD 0x0B // Type 'read' : This tells you if device is active, sleep or standy 0x00=STANDBY 0x01=WAKE 0x02=SLEEP
nherriot 0:bcf2aa85d7f9 86 #define WHO_AM_I 0x0D // Type 'read' : This should return the device id of 0x2A
nherriot 0:bcf2aa85d7f9 87
nherriot 0:bcf2aa85d7f9 88 #define PL_STATUS 0x10 // Type 'read' : This shows portrait landscape mode orientation
nherriot 0:bcf2aa85d7f9 89 #define PL_CFG 0x11 // Type 'read/write' : This allows portrait landscape configuration
nherriot 0:bcf2aa85d7f9 90 #define PL_COUNT 0x12 // Type 'read' : This is the portraint landscape debounce counter
nherriot 0:bcf2aa85d7f9 91 #define PL_BF_ZCOMP 0x13 // Type 'read' :
nherriot 0:bcf2aa85d7f9 92 #define PL_THS_REG 0x14 // Type 'read' :
nherriot 0:bcf2aa85d7f9 93
nherriot 0:bcf2aa85d7f9 94 #define FF_MT_CFG 0X15 // Type 'read/write' : Freefaul motion functional block configuration
nherriot 0:bcf2aa85d7f9 95 #define FF_MT_SRC 0X16 // Type 'read' : Freefaul motion event source register
nherriot 1:ef026bf28798 96 #define FF_MT_THS 0X17 // Type 'read' : Freefaul motion threshold register
nherriot 0:bcf2aa85d7f9 97 #define FF_COUNT 0X18 // Type 'read' : Freefaul motion debouce counter
nherriot 0:bcf2aa85d7f9 98
nherriot 3:ffb0b1650ca2 99 #define ASLP_COUNT 0x29 // Type 'read/write' : Counter settings for auto sleep
nherriot 0:bcf2aa85d7f9 100 #define CTRL_REG_1 0x2A // Type 'read/write' :
nherriot 0:bcf2aa85d7f9 101 #define CTRL_REG_2 0x2B // Type 'read/write' :
nherriot 0:bcf2aa85d7f9 102 #define CTRL_REG_3 0x2C // Type 'read/write' :
nherriot 0:bcf2aa85d7f9 103 #define CTRL_REG_4 0x2D // Type 'read/write' :
nherriot 0:bcf2aa85d7f9 104 #define CTRL_REG_5 0x2E // Type 'read/write' :
nherriot 0:bcf2aa85d7f9 105
nherriot 3:ffb0b1650ca2 106 // Defined in table 13 of the Freescale PDF
nherriot 3:ffb0b1650ca2 107 #define STANDBY 0x00 // State value returned after a SYSMOD request, it can be in state STANDBY, WAKE or SLEEP
nherriot 3:ffb0b1650ca2 108 #define WAKE 0x01 // State value returned after a SYSMOD request, it can be in state STANDBY, WAKE or SLEEP
nherriot 3:ffb0b1650ca2 109 #define SLEEP 0x02 // State value returned after a SYSMOD request, it can be in state STANDBY, WAKE or SLEEP
nherriot 3:ffb0b1650ca2 110 #define ACTIVE 0x01 // Stage value returned and set in Control Register 1, it can be STANDBY=00, or ACTIVE=01
nherriot 3:ffb0b1650ca2 111
nherriot 0:bcf2aa85d7f9 112
nherriot 0:bcf2aa85d7f9 113
nherriot 0:bcf2aa85d7f9 114 #define TILT_STATUS 0x03 // Tilt Status (Read only)
nherriot 0:bcf2aa85d7f9 115 #define SRST_STATUS 0x04 // Sample Rate Status Register (Read only)
nherriot 0:bcf2aa85d7f9 116 #define SPCNT_STATUS 0x05 // Sleep Count Register (Read/Write)
nherriot 0:bcf2aa85d7f9 117 #define INTSU_STATUS 0x06 // Interrupt Setup Register
nherriot 0:bcf2aa85d7f9 118 #define MODE_STATUS 0x07 // Mode Register (Read/Write)
nherriot 0:bcf2aa85d7f9 119 #define SR_STATUS 0x08 // Auto-Wake and Active Mode Portrait/Landscape Samples per Seconds Register (Read/Write)
nherriot 0:bcf2aa85d7f9 120 #define PDET_STATUS 0x09 // Tap/Pulse Detection Register (Read/Write)
nherriot 0:bcf2aa85d7f9 121 #define PD_STATUS 0xA // Tap/Pulse Debounce Count Register (Read/Write)
nherriot 0:bcf2aa85d7f9 122
ashleymills 11:dfd1e0afcb7b 123 #define MMA8452_ACTIVE_MASK 0x01
ashleymills 11:dfd1e0afcb7b 124 #define MMA8452_STANDBY_MASK 0xFE
ashleymills 11:dfd1e0afcb7b 125
ashleymills 11:dfd1e0afcb7b 126 #define MMA8452_XYZ_DATA_CFG 0x0E
ashleymills 11:dfd1e0afcb7b 127 #define MMA8452_CTRL_REG_1 0x2A
ashleymills 11:dfd1e0afcb7b 128
ashleymills 11:dfd1e0afcb7b 129 #define MMA8452_DYNAMIC_RANGE_MASK 0xFC
ashleymills 11:dfd1e0afcb7b 130
ashleymills 11:dfd1e0afcb7b 131
ashleymills 11:dfd1e0afcb7b 132 #define MMA8452_DATA_RATE_MASK 0xC7
ashleymills 11:dfd1e0afcb7b 133 #define MMA8452_DATA_RATE_MASK_SHIFT 0x03
ashleymills 11:dfd1e0afcb7b 134
ashleymills 11:dfd1e0afcb7b 135 #define MMA8452_WRITE_MASK 0xFE
ashleymills 11:dfd1e0afcb7b 136 #define MMA8452_READ_MASK 0x01
ashleymills 11:dfd1e0afcb7b 137
ashleymills 11:dfd1e0afcb7b 138 #define MMA8452_BIT_DEPTH_MASK 0xFD
ashleymills 11:dfd1e0afcb7b 139 #define MMA8452_BIT_DEPTH_MASK_SHIFT 0x01
ashleymills 11:dfd1e0afcb7b 140
ashleymills 10:ca9ba7ad4e94 141 class MMA8452
nherriot 0:bcf2aa85d7f9 142 {
nherriot 0:bcf2aa85d7f9 143 public:
ashleymills 10:ca9ba7ad4e94 144
ashleymills 11:dfd1e0afcb7b 145 enum DynamicRange {
ashleymills 11:dfd1e0afcb7b 146 DYNAMIC_RANGE_2G=0x00,
ashleymills 11:dfd1e0afcb7b 147 DYNAMIC_RANGE_4G,
ashleymills 11:dfd1e0afcb7b 148 DYNAMIC_RANGE_8G,
ashleymills 11:dfd1e0afcb7b 149 DYNAMIC_RANGE_UNKNOWN
ashleymills 10:ca9ba7ad4e94 150 };
nherriot 0:bcf2aa85d7f9 151
ashleymills 10:ca9ba7ad4e94 152 enum BitDepth {
ashleymills 11:dfd1e0afcb7b 153 BIT_DEPTH_12=0x00,
ashleymills 11:dfd1e0afcb7b 154 BIT_DEPTH_8 // 1 sets fast read mode, hence the inversion
ashleymills 10:ca9ba7ad4e94 155 };
ashleymills 11:dfd1e0afcb7b 156
ashleymills 11:dfd1e0afcb7b 157 enum DataRateHz {
ashleymills 11:dfd1e0afcb7b 158 RATE_800=0x00,
ashleymills 11:dfd1e0afcb7b 159 RATE_400,
ashleymills 11:dfd1e0afcb7b 160 RATE_200,
ashleymills 11:dfd1e0afcb7b 161 RATE_100,
ashleymills 11:dfd1e0afcb7b 162 RATE_50,
ashleymills 11:dfd1e0afcb7b 163 RATE_12_5,
ashleymills 11:dfd1e0afcb7b 164 RATE_6_25,
ashleymills 11:dfd1e0afcb7b 165 RATE_1_563,
ashleymills 11:dfd1e0afcb7b 166 RATE_UNKNOWN
ashleymills 11:dfd1e0afcb7b 167 };
ashleymills 11:dfd1e0afcb7b 168
ashleymills 11:dfd1e0afcb7b 169 //void setDynamicRange(
nherriot 0:bcf2aa85d7f9 170
nherriot 0:bcf2aa85d7f9 171 /** Create an accelerometer object connected to the specified I2C object
nherriot 0:bcf2aa85d7f9 172 *
nherriot 0:bcf2aa85d7f9 173 * @param sda I2C data port
nherriot 0:bcf2aa85d7f9 174 * @param scl I2C8452 clock port
nherriot 0:bcf2aa85d7f9 175 *
nherriot 0:bcf2aa85d7f9 176 */
ashleymills 10:ca9ba7ad4e94 177 MMA8452(PinName sda, PinName scl, int frequency);
nherriot 1:ef026bf28798 178 //Accelerometer_MMA8452(PinName sda, PinName scl);
nherriot 0:bcf2aa85d7f9 179
nherriot 0:bcf2aa85d7f9 180 /** Destroys an MMA8452 object
nherriot 0:bcf2aa85d7f9 181 *
nherriot 0:bcf2aa85d7f9 182 */
ashleymills 10:ca9ba7ad4e94 183 ~MMA8452();
nherriot 3:ffb0b1650ca2 184
ashleymills 11:dfd1e0afcb7b 185 //int setOperationMode(OperationMode m);
nherriot 3:ffb0b1650ca2 186
nherriot 3:ffb0b1650ca2 187
nherriot 0:bcf2aa85d7f9 188 /** Activate the MMA8452 (required)
nherriot 1:ef026bf28798 189 * returns 0 for success in activating the chip
nherriot 1:ef026bf28798 190 * returns 1 for failure in activating the chip
nherriot 1:ef026bf28798 191 * -currrently no retries or waiting is done, this method tries 1 time the exits.
nherriot 3:ffb0b1650ca2 192 *
nherriot 3:ffb0b1650ca2 193 * This will set the device 'active' even if it's already active. It's just a way to force that state.
nherriot 1:ef026bf28798 194 */
nherriot 0:bcf2aa85d7f9 195 int activate();
nherriot 3:ffb0b1650ca2 196
nherriot 3:ffb0b1650ca2 197
nherriot 3:ffb0b1650ca2 198 /** Standby the MMA8452 (not required)
nherriot 3:ffb0b1650ca2 199 * returns 0 for success in activating the chip
nherriot 3:ffb0b1650ca2 200 * returns 1 for failure in activating the chip
nherriot 3:ffb0b1650ca2 201 * -currrently no retries or waiting is done, this method tries 1 time the exits.
nherriot 3:ffb0b1650ca2 202 *
nherriot 3:ffb0b1650ca2 203 * This will set the device 'standby' even if it's already in standby. It's just a way to force that state.
nherriot 3:ffb0b1650ca2 204 */
nherriot 3:ffb0b1650ca2 205 int standby();
nherriot 3:ffb0b1650ca2 206
nherriot 3:ffb0b1650ca2 207
nherriot 5:b3d0abd97e55 208 /** get_CTRL_Reg1 the MMA8452 (not required)
nherriot 5:b3d0abd97e55 209 * returns 0 for success in activating the chip
nherriot 5:b3d0abd97e55 210 * returns 1 for failure in activating the chip
nherriot 5:b3d0abd97e55 211 * -currrently no retries or waiting is done, this method tries 1 time the exits.
nherriot 5:b3d0abd97e55 212 *
nherriot 5:b3d0abd97e55 213 * This will return the state of the control register 1. This holds and sets values for auto wake, sleep mode
nherriot 5:b3d0abd97e55 214 * output data rate, fast read mode and active/standby. More info on 6.7 of pdf for MMA8452 Freescale doc.
nherriot 5:b3d0abd97e55 215 */
ashleymills 11:dfd1e0afcb7b 216 int get_CTRL_Reg1(char* dst);
nherriot 5:b3d0abd97e55 217
nherriot 0:bcf2aa85d7f9 218
nherriot 0:bcf2aa85d7f9 219 /** Initialization of device MMA8452 (required)
nherriot 0:bcf2aa85d7f9 220 */
nherriot 0:bcf2aa85d7f9 221 void init();
nherriot 0:bcf2aa85d7f9 222
nherriot 1:ef026bf28798 223 /** Read the device ID from the accelerometer
nherriot 1:ef026bf28798 224 *
nherriot 1:ef026bf28798 225 * @param *deviceID Value of device - is should be 0x2A
nherriot 1:ef026bf28798 226 * return 0 for success or
nherriot 1:ef026bf28798 227 * return 1 for failure.
nherriot 1:ef026bf28798 228 */
ashleymills 11:dfd1e0afcb7b 229 int getDeviceID(char* dst);
nherriot 0:bcf2aa85d7f9 230
nherriot 3:ffb0b1650ca2 231 int read_y();
nherriot 3:ffb0b1650ca2 232
nherriot 3:ffb0b1650ca2 233 int read_z();
nherriot 3:ffb0b1650ca2 234
nherriot 0:bcf2aa85d7f9 235 /** Read the x register of the MMA8452
nherriot 0:bcf2aa85d7f9 236 *
nherriot 0:bcf2aa85d7f9 237 * @returns The value of x acceleration
nherriot 0:bcf2aa85d7f9 238 */
ashleymills 10:ca9ba7ad4e94 239 int readRawX(char *xaxis);
nherriot 3:ffb0b1650ca2 240 //int read_x(int& xaxisLSB);
nherriot 0:bcf2aa85d7f9 241 /** Read the y register of the MMA8452
nherriot 0:bcf2aa85d7f9 242 *
nherriot 0:bcf2aa85d7f9 243 * @returns The value of y acceleration
nherriot 0:bcf2aa85d7f9 244 */
ashleymills 10:ca9ba7ad4e94 245 int readRawY(char *yaxis);
nherriot 0:bcf2aa85d7f9 246
nherriot 0:bcf2aa85d7f9 247 /** Read the z register of the MMA8452
nherriot 0:bcf2aa85d7f9 248 *
nherriot 0:bcf2aa85d7f9 249 * @returns The value of z acceleration
nherriot 0:bcf2aa85d7f9 250 */
ashleymills 10:ca9ba7ad4e94 251 int readRawZ(char * zaxis);
nherriot 1:ef026bf28798 252
nherriot 1:ef026bf28798 253 /** Read the x,y and z registers of the MMA8452
nherriot 1:ef026bf28798 254 *
nherriot 1:ef026bf28798 255 * takes a 2 byte char buffer to store the value
nherriot 1:ef026bf28798 256 * for each axis.
nherriot 1:ef026bf28798 257 * returns 0 for success, and 1 for failure
nherriot 1:ef026bf28798 258 *
nherriot 1:ef026bf28798 259 */
ashleymills 10:ca9ba7ad4e94 260 int readRawXYZ(char *x, char *y, char *z);
nherriot 0:bcf2aa85d7f9 261
nherriot 0:bcf2aa85d7f9 262 /** Read from specified MMA8452 register
nherriot 0:bcf2aa85d7f9 263 *
nherriot 0:bcf2aa85d7f9 264 * @param addr The internal registeraddress of the MMA8452
nherriot 0:bcf2aa85d7f9 265 * @returns The value of the register
nherriot 0:bcf2aa85d7f9 266 */
ashleymills 11:dfd1e0afcb7b 267 int readRegister(char addr, char *dst);
ashleymills 11:dfd1e0afcb7b 268
ashleymills 11:dfd1e0afcb7b 269 int readRegister(char addr, char *dst, int nbytes);
nherriot 0:bcf2aa85d7f9 270
nherriot 0:bcf2aa85d7f9 271 /** Write to specified MMA8452 register
nherriot 0:bcf2aa85d7f9 272 *
nherriot 0:bcf2aa85d7f9 273 * @param addr The internal registeraddress of the MMA8452
nherriot 0:bcf2aa85d7f9 274 * @param data New value of the register
nherriot 0:bcf2aa85d7f9 275 */
ashleymills 11:dfd1e0afcb7b 276 int writeRegister(char addr, char data);
ashleymills 11:dfd1e0afcb7b 277 int writeRegister(char addr, char *data, int nbytes);
ashleymills 11:dfd1e0afcb7b 278
ashleymills 11:dfd1e0afcb7b 279 int logicalANDRegister(char addr, char mask);
ashleymills 11:dfd1e0afcb7b 280 int logicalORRegister(char addr, char mask);
ashleymills 11:dfd1e0afcb7b 281 int logicalXORRegister(char addr, char mask);
nherriot 0:bcf2aa85d7f9 282
ashleymills 11:dfd1e0afcb7b 283 int setDynamicRange(DynamicRange range, int toggleActivation=1);
ashleymills 11:dfd1e0afcb7b 284 int setBitDepth(BitDepth depth, int toggleActivation=1);
ashleymills 11:dfd1e0afcb7b 285 int setDataRate(DataRateHz dataRate, int toggleActivation=1);
ashleymills 11:dfd1e0afcb7b 286 DynamicRange getDynamicRange();
ashleymills 11:dfd1e0afcb7b 287 DataRateHz getDataRate();
ashleymills 11:dfd1e0afcb7b 288
ashleymills 11:dfd1e0afcb7b 289 void debugRegister(char reg);
nherriot 0:bcf2aa85d7f9 290
nherriot 0:bcf2aa85d7f9 291 private:
ashleymills 10:ca9ba7ad4e94 292 int readRaw(char src, char *dst, int len);
ashleymills 11:dfd1e0afcb7b 293 int maskAndApplyRegister(char reg, char mask, char value, int toggleActivation);
ashleymills 8:89272163f395 294
ashleymills 11:dfd1e0afcb7b 295 I2C _i2c;
ashleymills 11:dfd1e0afcb7b 296 int _frequency;
ashleymills 6:f6bde04bf8be 297 int _readAddress;
ashleymills 6:f6bde04bf8be 298 int _writeAddress;
nherriot 0:bcf2aa85d7f9 299
nherriot 0:bcf2aa85d7f9 300 };
nherriot 0:bcf2aa85d7f9 301
nherriot 0:bcf2aa85d7f9 302 //#endif