IBM Watson IoT / Mbed OS IBMIoTClientEthernetExample

Contains example code to connect the mbed LPC1768 or FRDM-K64F devices to the IBM Internet of Things Cloud service via ethernet.

Dependencies:   C12832 MQTT LM75B MMA7660

Dependents:   MFT_IoT_demo_USB400 IBM_RFID

MMA7660/MMA7660.cpp@6:37b6d0d56190, 2014-08-20 (annotated)

Committer:
samdanbury
Date:
Wed Aug 20 12:45:14 2014 +0000
Revision:
6:37b6d0d56190
Code completely changed to improve the structure, flow and memory usage of the application

Who changed what in which revision?

UserRevisionLine numberNew contents of line
samdanbury 6:37b6d0d56190 1 #include "MMA7660.h"
samdanbury 6:37b6d0d56190 2
samdanbury 6:37b6d0d56190 3 MMA7660::MMA7660(PinName sda, PinName scl, bool active) : _i2c(sda, scl)
samdanbury 6:37b6d0d56190 4 {
samdanbury 6:37b6d0d56190 5 setActive(active);
samdanbury 6:37b6d0d56190 6 samplerate = 64;
samdanbury 6:37b6d0d56190 7 }
samdanbury 6:37b6d0d56190 8
samdanbury 6:37b6d0d56190 9 //Since the MMA lacks a WHO_AM_I register, we can only check if there is a device that answers to the I2C address
samdanbury 6:37b6d0d56190 10 bool MMA7660::testConnection( void )
samdanbury 6:37b6d0d56190 11 {
samdanbury 6:37b6d0d56190 12 if (_i2c.write(MMA7660_ADDRESS, NULL, 0) == 0 )
samdanbury 6:37b6d0d56190 13 return true;
samdanbury 6:37b6d0d56190 14 else
samdanbury 6:37b6d0d56190 15 return false;
samdanbury 6:37b6d0d56190 16 }
samdanbury 6:37b6d0d56190 17
samdanbury 6:37b6d0d56190 18 void MMA7660::setActive(bool state)
samdanbury 6:37b6d0d56190 19 {
samdanbury 6:37b6d0d56190 20 active = state;
samdanbury 6:37b6d0d56190 21 char modereg = read(MMA7660_MODE_R);
samdanbury 6:37b6d0d56190 22 modereg &= ~(1<<0);
samdanbury 6:37b6d0d56190 23
samdanbury 6:37b6d0d56190 24 //If it somehow was in testmode, disable that
samdanbury 6:37b6d0d56190 25 if (modereg && (1<<2)) {
samdanbury 6:37b6d0d56190 26 modereg &= ~(1<<2);
samdanbury 6:37b6d0d56190 27 write(MMA7660_MODE_R, modereg);
samdanbury 6:37b6d0d56190 28 }
samdanbury 6:37b6d0d56190 29
samdanbury 6:37b6d0d56190 30 modereg += state;
samdanbury 6:37b6d0d56190 31 write(MMA7660_MODE_R, modereg);
samdanbury 6:37b6d0d56190 32 }
samdanbury 6:37b6d0d56190 33
samdanbury 6:37b6d0d56190 34 void MMA7660::readData(int *data)
samdanbury 6:37b6d0d56190 35 {
samdanbury 6:37b6d0d56190 36 bool active_old = active;
samdanbury 6:37b6d0d56190 37 if (!active) {
samdanbury 6:37b6d0d56190 38 setActive(true);
samdanbury 6:37b6d0d56190 39 wait(0.012 + 1/samplerate); //Wait until new sample is ready, my experience is that 1/samplerate isnt needed, but datasheet says so
samdanbury 6:37b6d0d56190 40 }
samdanbury 6:37b6d0d56190 41
samdanbury 6:37b6d0d56190 42 char temp[3];
samdanbury 6:37b6d0d56190 43 bool alert;
samdanbury 6:37b6d0d56190 44
samdanbury 6:37b6d0d56190 45 do {
samdanbury 6:37b6d0d56190 46 alert = false;
samdanbury 6:37b6d0d56190 47 read(MMA7660_XOUT_R, temp, 3);
samdanbury 6:37b6d0d56190 48 for (int i = 0; i<3; i++) {
samdanbury 6:37b6d0d56190 49 if (temp[i] > 63)
samdanbury 6:37b6d0d56190 50 alert = true;
samdanbury 6:37b6d0d56190 51 if (temp[i] > 31)
samdanbury 6:37b6d0d56190 52 temp[i] += 128+64;
samdanbury 6:37b6d0d56190 53 data[i] = (signed char)temp[i];
samdanbury 6:37b6d0d56190 54 }
samdanbury 6:37b6d0d56190 55 } while (alert);
samdanbury 6:37b6d0d56190 56
samdanbury 6:37b6d0d56190 57 if (!active_old)
samdanbury 6:37b6d0d56190 58 setActive(false);
samdanbury 6:37b6d0d56190 59 }
samdanbury 6:37b6d0d56190 60
samdanbury 6:37b6d0d56190 61
samdanbury 6:37b6d0d56190 62 void MMA7660::readData(float *data)
samdanbury 6:37b6d0d56190 63 {
samdanbury 6:37b6d0d56190 64 int intdata[3];
samdanbury 6:37b6d0d56190 65 readData(intdata);
samdanbury 6:37b6d0d56190 66 for (int i = 0; i<3; i++)
samdanbury 6:37b6d0d56190 67 data[i] = intdata[i]/MMA7660_SENSITIVITY;
samdanbury 6:37b6d0d56190 68 }
samdanbury 6:37b6d0d56190 69
samdanbury 6:37b6d0d56190 70 float MMA7660::x( void )
samdanbury 6:37b6d0d56190 71 {
samdanbury 6:37b6d0d56190 72 return getSingle(0);
samdanbury 6:37b6d0d56190 73 }
samdanbury 6:37b6d0d56190 74
samdanbury 6:37b6d0d56190 75 float MMA7660::y( void )
samdanbury 6:37b6d0d56190 76 {
samdanbury 6:37b6d0d56190 77 return getSingle(1);
samdanbury 6:37b6d0d56190 78 }
samdanbury 6:37b6d0d56190 79
samdanbury 6:37b6d0d56190 80 float MMA7660::z( void )
samdanbury 6:37b6d0d56190 81 {
samdanbury 6:37b6d0d56190 82 return getSingle(2);
samdanbury 6:37b6d0d56190 83 }
samdanbury 6:37b6d0d56190 84
samdanbury 6:37b6d0d56190 85
samdanbury 6:37b6d0d56190 86 void MMA7660::setSampleRate(int samplerate)
samdanbury 6:37b6d0d56190 87 {
samdanbury 6:37b6d0d56190 88 bool active_old = active;
samdanbury 6:37b6d0d56190 89 setActive(false); //Not allowed to be active to change anything
samdanbury 6:37b6d0d56190 90 int rates[] = {120, 64, 32, 16, 8, 4, 2, 1}; //Alowed samplerates (and their number in array is also number required for MMA)
samdanbury 6:37b6d0d56190 91 int sampleLoc = 0, sampleError = 10000, temp;
samdanbury 6:37b6d0d56190 92 for (int i = 0; i<8; i++) {
samdanbury 6:37b6d0d56190 93 temp = abs( rates[i] - samplerate );
samdanbury 6:37b6d0d56190 94 if (temp<sampleError) {
samdanbury 6:37b6d0d56190 95 sampleLoc = i;
samdanbury 6:37b6d0d56190 96 sampleError=temp;
samdanbury 6:37b6d0d56190 97 }
samdanbury 6:37b6d0d56190 98 }
samdanbury 6:37b6d0d56190 99
samdanbury 6:37b6d0d56190 100 //Update the samplerate reg
samdanbury 6:37b6d0d56190 101 temp = read(MMA7660_SR_R);
samdanbury 6:37b6d0d56190 102 temp &= ~0x07; //Awake sample rate are lowest 3 bit
samdanbury 6:37b6d0d56190 103 temp |= sampleLoc;
samdanbury 6:37b6d0d56190 104 write(MMA7660_SR_R, temp);
samdanbury 6:37b6d0d56190 105 this->samplerate = rates[sampleLoc];
samdanbury 6:37b6d0d56190 106 setActive(active_old); //Restore previous active state
samdanbury 6:37b6d0d56190 107 }
samdanbury 6:37b6d0d56190 108
samdanbury 6:37b6d0d56190 109
samdanbury 6:37b6d0d56190 110 MMA7660::Orientation MMA7660::getSide( void )
samdanbury 6:37b6d0d56190 111 {
samdanbury 6:37b6d0d56190 112 char tiltreg = read(MMA7660_TILT_R);
samdanbury 6:37b6d0d56190 113 //We care about 2 LSBs
samdanbury 6:37b6d0d56190 114 tiltreg &= 0x03;
samdanbury 6:37b6d0d56190 115 if (tiltreg == 0x01)
samdanbury 6:37b6d0d56190 116 return MMA7660::Front;
samdanbury 6:37b6d0d56190 117 if (tiltreg == 0x02)
samdanbury 6:37b6d0d56190 118 return MMA7660::Back;
samdanbury 6:37b6d0d56190 119 return MMA7660::Unknown;
samdanbury 6:37b6d0d56190 120 }
samdanbury 6:37b6d0d56190 121
samdanbury 6:37b6d0d56190 122 MMA7660::Orientation MMA7660::getOrientation( void )
samdanbury 6:37b6d0d56190 123 {
samdanbury 6:37b6d0d56190 124 char tiltreg = read(MMA7660_TILT_R);
samdanbury 6:37b6d0d56190 125
samdanbury 6:37b6d0d56190 126 //We care about bit 2, 3 and 4 (counting from zero)
samdanbury 6:37b6d0d56190 127 tiltreg &= 0x07<<2;
samdanbury 6:37b6d0d56190 128 tiltreg >>= 2;
samdanbury 6:37b6d0d56190 129 if (tiltreg == 0x01)
samdanbury 6:37b6d0d56190 130 return MMA7660::Left;
samdanbury 6:37b6d0d56190 131 if (tiltreg == 0x02)
samdanbury 6:37b6d0d56190 132 return MMA7660::Right;
samdanbury 6:37b6d0d56190 133 if (tiltreg == 0x05)
samdanbury 6:37b6d0d56190 134 return MMA7660::Down;
samdanbury 6:37b6d0d56190 135 if (tiltreg == 0x06)
samdanbury 6:37b6d0d56190 136 return MMA7660::Up;
samdanbury 6:37b6d0d56190 137 return MMA7660::Unknown;
samdanbury 6:37b6d0d56190 138 }
samdanbury 6:37b6d0d56190 139
samdanbury 6:37b6d0d56190 140
samdanbury 6:37b6d0d56190 141
samdanbury 6:37b6d0d56190 142 //////////////////////////////////////////////
samdanbury 6:37b6d0d56190 143 ///////////////PRIVATE////////////////////////
samdanbury 6:37b6d0d56190 144 //////////////////////////////////////////////
samdanbury 6:37b6d0d56190 145
samdanbury 6:37b6d0d56190 146
samdanbury 6:37b6d0d56190 147 void MMA7660::write(char address, char data)
samdanbury 6:37b6d0d56190 148 {
samdanbury 6:37b6d0d56190 149 char temp[2];
samdanbury 6:37b6d0d56190 150 temp[0]=address;
samdanbury 6:37b6d0d56190 151 temp[1]=data;
samdanbury 6:37b6d0d56190 152
samdanbury 6:37b6d0d56190 153 _i2c.write(MMA7660_ADDRESS, temp, 2);
samdanbury 6:37b6d0d56190 154 }
samdanbury 6:37b6d0d56190 155
samdanbury 6:37b6d0d56190 156 char MMA7660::read(char address)
samdanbury 6:37b6d0d56190 157 {
samdanbury 6:37b6d0d56190 158 char retval;
samdanbury 6:37b6d0d56190 159 _i2c.write(MMA7660_ADDRESS, &address, 1, true);
samdanbury 6:37b6d0d56190 160 _i2c.read(MMA7660_ADDRESS, &retval, 1);
samdanbury 6:37b6d0d56190 161 return retval;
samdanbury 6:37b6d0d56190 162 }
samdanbury 6:37b6d0d56190 163
samdanbury 6:37b6d0d56190 164 void MMA7660::read(char address, char *data, int length)
samdanbury 6:37b6d0d56190 165 {
samdanbury 6:37b6d0d56190 166 _i2c.write(MMA7660_ADDRESS, &address, 1, true);
samdanbury 6:37b6d0d56190 167 _i2c.read(MMA7660_ADDRESS, data, length);
samdanbury 6:37b6d0d56190 168 }
samdanbury 6:37b6d0d56190 169
samdanbury 6:37b6d0d56190 170 float MMA7660::getSingle( int number )
samdanbury 6:37b6d0d56190 171 {
samdanbury 6:37b6d0d56190 172 bool active_old = active;
samdanbury 6:37b6d0d56190 173 if (!active) {
samdanbury 6:37b6d0d56190 174 setActive(true);
samdanbury 6:37b6d0d56190 175 wait(0.012 + 1/samplerate); //Wait until new sample is ready
samdanbury 6:37b6d0d56190 176 }
samdanbury 6:37b6d0d56190 177
samdanbury 6:37b6d0d56190 178 signed char temp;
samdanbury 6:37b6d0d56190 179 bool alert;
samdanbury 6:37b6d0d56190 180
samdanbury 6:37b6d0d56190 181 do {
samdanbury 6:37b6d0d56190 182 alert = false;
samdanbury 6:37b6d0d56190 183 temp = read(MMA7660_XOUT_R + number);
samdanbury 6:37b6d0d56190 184 if (temp > 63)
samdanbury 6:37b6d0d56190 185 alert = true;
samdanbury 6:37b6d0d56190 186 if (temp > 31)
samdanbury 6:37b6d0d56190 187 temp += 128+64;
samdanbury 6:37b6d0d56190 188 } while (alert);
samdanbury 6:37b6d0d56190 189
samdanbury 6:37b6d0d56190 190 if (!active_old)
samdanbury 6:37b6d0d56190 191 setActive(false);
samdanbury 6:37b6d0d56190 192
samdanbury 6:37b6d0d56190 193 return temp / MMA7660_SENSITIVITY;
samdanbury 6:37b6d0d56190 194 }