Shengyuan Chu / Mbed 2 deprecated AngleMeter

Simple Electronic Angle Meter and Spirit Level.

Dependencies:   MMA8452 mbed

main.cpp@1:f167423f6f0c, 2015-05-11 (annotated)

Committer:
chushengyuan
Date:
Mon May 11 13:15:33 2015 +0000
Revision:
1:f167423f6f0c
Parent:
0:2885d4453e88 
Final

Who changed what in which revision?

UserRevisionLine numberNew contents of line
chushengyuan 0:2885d4453e88 1 /**
chushengyuan 0:2885d4453e88 2 @file main.cpp
chushengyuan 1:f167423f6f0c 3 @brief Electronic Angle Meter and Spirit Level.
chushengyuan 0:2885d4453e88 4 @brief Revision 1.0.
chushengyuan 0:2885d4453e88 5 @author Shengyuan Chu
chushengyuan 0:2885d4453e88 6 @date May 2015
chushengyuan 0:2885d4453e88 7 */
chushengyuan 0:2885d4453e88 8
chushengyuan 0:2885d4453e88 9 #include "mbed.h"
chushengyuan 0:2885d4453e88 10 #include "main.h"
chushengyuan 0:2885d4453e88 11 #include "MMA8452.h"
chushengyuan 0:2885d4453e88 12 #include "PowerControl/PowerControl.h"
chushengyuan 0:2885d4453e88 13 #include "PowerControl/EthernetPowerControl.h"
chushengyuan 0:2885d4453e88 14
chushengyuan 0:2885d4453e88 15 /**
chushengyuan 0:2885d4453e88 16 @brief Connect all components to mbed LPC1768.
chushengyuan 0:2885d4453e88 17 @brief Connect LCD to pin 7,8,9,10,11,13,26.
chushengyuan 0:2885d4453e88 18 @brief Connect Accelerometer to pin 27,28.
chushengyuan 0:2885d4453e88 19 @brief Connect buzzer to pin 21.
chushengyuan 0:2885d4453e88 20 @brief Connect button to pin 17.
chushengyuan 0:2885d4453e88 21 @brief Connect LEDs to pin 22,23,24,25.
chushengyuan 0:2885d4453e88 22 */
chushengyuan 0:2885d4453e88 23 N5110 lcd(p7,p8,p9,p10,p11,p13,p26);
chushengyuan 0:2885d4453e88 24 MMA8452 mma8452(p28,p27);
chushengyuan 0:2885d4453e88 25 PwmOut buzzer(p21);
chushengyuan 0:2885d4453e88 26 DigitalIn pb(p17);
chushengyuan 0:2885d4453e88 27 DigitalOut ledA(p25);
chushengyuan 0:2885d4453e88 28 DigitalOut ledB(p23);
chushengyuan 0:2885d4453e88 29 DigitalOut ledC(p22);
chushengyuan 0:2885d4453e88 30 DigitalOut ledD(p24);
chushengyuan 0:2885d4453e88 31
chushengyuan 0:2885d4453e88 32 Serial serial(USBTX,USBRX);
chushengyuan 0:2885d4453e88 33 Timeout flipper;
chushengyuan 0:2885d4453e88 34
chushengyuan 0:2885d4453e88 35 /**
chushengyuan 0:2885d4453e88 36 @brief Function prototypes.
chushengyuan 0:2885d4453e88 37 */
chushengyuan 0:2885d4453e88 38 void Switch (int functoion);
chushengyuan 0:2885d4453e88 39 void AngleMeter();
chushengyuan 1:f167423f6f0c 40 void SpiritLevel();
chushengyuan 0:2885d4453e88 41 void fun1();
chushengyuan 0:2885d4453e88 42 void fun2();
chushengyuan 0:2885d4453e88 43
chushengyuan 0:2885d4453e88 44 /**
chushengyuan 0:2885d4453e88 45 @brief Different frequencies of buzzer.
chushengyuan 0:2885d4453e88 46 */
chushengyuan 1:f167423f6f0c 47 float frequency1 = 1046.5;
chushengyuan 1:f167423f6f0c 48 float frequency2 = 1174.7;
chushengyuan 1:f167423f6f0c 49 float frequency3 = 1318.5;
chushengyuan 0:2885d4453e88 50
chushengyuan 0:2885d4453e88 51 /**
chushengyuan 0:2885d4453e88 52 @brief Main function.
chushengyuan 0:2885d4453e88 53 @brief Call function of Angle Meter without pushing
chushengyuan 0:2885d4453e88 54 @brief button when power is initally turned on.
chushengyuan 0:2885d4453e88 55 */
chushengyuan 0:2885d4453e88 56 int main() {
chushengyuan 0:2885d4453e88 57
chushengyuan 0:2885d4453e88 58 /**Power down Ethernet interface to save power.*/
chushengyuan 0:2885d4453e88 59 PHY_PowerDown();
chushengyuan 0:2885d4453e88 60
chushengyuan 0:2885d4453e88 61 /**Initialise LCD and set brightness to 0.8.*/
chushengyuan 0:2885d4453e88 62 lcd.init();
chushengyuan 0:2885d4453e88 63 lcd.normalMode();
chushengyuan 0:2885d4453e88 64 lcd.setBrightness(0.8);
chushengyuan 0:2885d4453e88 65
chushengyuan 0:2885d4453e88 66 /**Display the name of Angle Meter function after the initialization of LCD.*/
chushengyuan 0:2885d4453e88 67 lcd.printString("Electronic",12,2);
chushengyuan 0:2885d4453e88 68 lcd.printString("Angle Meter",10,3);
chushengyuan 0:2885d4453e88 69
chushengyuan 0:2885d4453e88 70 /**Call function of Angle Meter after 2 seconds' delay.*/
chushengyuan 0:2885d4453e88 71 flipper.attach(&AngleMeter, 2.0);
chushengyuan 0:2885d4453e88 72
chushengyuan 0:2885d4453e88 73 /**Turn all the LEDs on when the power is initially turned on.*/
chushengyuan 0:2885d4453e88 74 ledA=1;
chushengyuan 0:2885d4453e88 75 ledB=1;
chushengyuan 0:2885d4453e88 76 ledC=1;
chushengyuan 0:2885d4453e88 77 ledD=1;
chushengyuan 0:2885d4453e88 78
chushengyuan 0:2885d4453e88 79 /**Set button to PullDown mode.*/
chushengyuan 0:2885d4453e88 80 pb.mode(PullDown);
chushengyuan 0:2885d4453e88 81
chushengyuan 0:2885d4453e88 82 /**Change the integer between 1 and 2 when button is pressed and send it to Switch function.*/
chushengyuan 0:2885d4453e88 83 int function = 1;
chushengyuan 0:2885d4453e88 84
chushengyuan 0:2885d4453e88 85 while(1) {
chushengyuan 0:2885d4453e88 86 if (pb){
chushengyuan 0:2885d4453e88 87 Switch(function);
chushengyuan 0:2885d4453e88 88
chushengyuan 0:2885d4453e88 89 /**Allow 0.2 second for button debounce.*/
chushengyuan 0:2885d4453e88 90 wait(0.2);
chushengyuan 0:2885d4453e88 91 while (pb);
chushengyuan 0:2885d4453e88 92 {if (function == 2) function = 1; else function++;}
chushengyuan 0:2885d4453e88 93 }
chushengyuan 0:2885d4453e88 94 }
chushengyuan 0:2885d4453e88 95 }
chushengyuan 0:2885d4453e88 96
chushengyuan 0:2885d4453e88 97 /**
chushengyuan 1:f167423f6f0c 98 @brief Switch functions between Angle Meter and Spirit Level.
chushengyuan 0:2885d4453e88 99 @param function - integer to change between 1 and 2.
chushengyuan 0:2885d4453e88 100 @return Call fun1() when function=2, call fun2() when function=1.
chushengyuan 0:2885d4453e88 101 */
chushengyuan 0:2885d4453e88 102 void Switch (int function)
chushengyuan 0:2885d4453e88 103 {
chushengyuan 0:2885d4453e88 104
chushengyuan 0:2885d4453e88 105 switch (function) {
chushengyuan 0:2885d4453e88 106 case 1 : fun2();
chushengyuan 0:2885d4453e88 107 break;
chushengyuan 0:2885d4453e88 108 case 2 : fun1();
chushengyuan 0:2885d4453e88 109 break;
chushengyuan 0:2885d4453e88 110 }
chushengyuan 0:2885d4453e88 111
chushengyuan 0:2885d4453e88 112 }
chushengyuan 0:2885d4453e88 113
chushengyuan 0:2885d4453e88 114 /**
chushengyuan 0:2885d4453e88 115 @brief Display angles in two dimensions and indicate directions using arrows.
chushengyuan 0:2885d4453e88 116 */
chushengyuan 0:2885d4453e88 117 void AngleMeter()
chushengyuan 0:2885d4453e88 118 {
chushengyuan 0:2885d4453e88 119 /**Initialise the accelerometer.*/
chushengyuan 0:2885d4453e88 120 mma8452.init();
chushengyuan 0:2885d4453e88 121 Acceleration acceleration;
chushengyuan 0:2885d4453e88 122
chushengyuan 0:2885d4453e88 123 /**Lower down the brightness of LCD to 0.5.*/
chushengyuan 0:2885d4453e88 124 lcd.clear();
chushengyuan 0:2885d4453e88 125 lcd.setBrightness(0.5);
chushengyuan 0:2885d4453e88 126
chushengyuan 0:2885d4453e88 127 /**When button is not pushed, main features of Angle Meter will be run.*/
chushengyuan 0:2885d4453e88 128 while(!pb) {
chushengyuan 0:2885d4453e88 129
chushengyuan 0:2885d4453e88 130 /**Display 'degree' in the last line of LCD.*/
chushengyuan 0:2885d4453e88 131 lcd.printString("degree",3,5);
chushengyuan 0:2885d4453e88 132 lcd.printString("degree",46,5);
chushengyuan 0:2885d4453e88 133
chushengyuan 0:2885d4453e88 134 /**Read value of acceleration.*/
chushengyuan 0:2885d4453e88 135 acceleration = mma8452.readValues();
chushengyuan 0:2885d4453e88 136
chushengyuan 0:2885d4453e88 137 float X=acceleration.x;
chushengyuan 0:2885d4453e88 138 float Y=acceleration.y;
chushengyuan 0:2885d4453e88 139 float Z=acceleration.z;
chushengyuan 0:2885d4453e88 140
chushengyuan 0:2885d4453e88 141 /**Calculate the angles in X and Y dimensions.*/
chushengyuan 0:2885d4453e88 142 float Ax=atan(X/sqrt(pow(Y,2)+pow(Z,2)))/3.14159265358979323846*180;
chushengyuan 0:2885d4453e88 143 float Ay=atan(Y/sqrt(pow(X,2)+pow(Z,2)))/3.14159265358979323846*180;
chushengyuan 0:2885d4453e88 144
chushengyuan 0:2885d4453e88 145 /**Print formatted data to buffer.*/
chushengyuan 0:2885d4453e88 146 char buffer1[14];
chushengyuan 0:2885d4453e88 147 int length = sprintf(buffer1,"%.0f",abs(Ax));
chushengyuan 0:2885d4453e88 148 char buffer2[14];
chushengyuan 0:2885d4453e88 149 length = sprintf(buffer2,"%.0f",abs(Ay));
chushengyuan 0:2885d4453e88 150
chushengyuan 0:2885d4453e88 151 /**Display values if string will fit on display.*/
chushengyuan 0:2885d4453e88 152 if (length <= 14) //
chushengyuan 0:2885d4453e88 153 lcd.printString(buffer1,20,3);
chushengyuan 0:2885d4453e88 154 lcd.printString(buffer2,55,3);
chushengyuan 0:2885d4453e88 155
chushengyuan 0:2885d4453e88 156 /**LED C will be turned on if the angle in X dimension is larger than 20 degree.*/
chushengyuan 0:2885d4453e88 157 if (Ax>20)
chushengyuan 0:2885d4453e88 158 ledC=1;
chushengyuan 0:2885d4453e88 159 else
chushengyuan 0:2885d4453e88 160 ledC=0;
chushengyuan 0:2885d4453e88 161
chushengyuan 0:2885d4453e88 162 /**LED A will be turned on if the angle in X dimension is smaller than -20 degree.*/
chushengyuan 0:2885d4453e88 163 if (Ax<-20)
chushengyuan 0:2885d4453e88 164 ledA=1;
chushengyuan 0:2885d4453e88 165 else
chushengyuan 0:2885d4453e88 166 ledA=0;
chushengyuan 0:2885d4453e88 167
chushengyuan 0:2885d4453e88 168 /**LED D will be turned on if the angle in Y dimension is larger than 20 degree.*/
chushengyuan 0:2885d4453e88 169 if (Ay>20)
chushengyuan 0:2885d4453e88 170 ledD=1;
chushengyuan 0:2885d4453e88 171 else
chushengyuan 0:2885d4453e88 172 ledD=0;
chushengyuan 0:2885d4453e88 173
chushengyuan 0:2885d4453e88 174 /**LED B will be turned on if the angle in Y dimension is smaller than -20 degree.*/
chushengyuan 0:2885d4453e88 175 if (Ay<-20)
chushengyuan 0:2885d4453e88 176 ledB=1;
chushengyuan 0:2885d4453e88 177 else
chushengyuan 0:2885d4453e88 178 ledB=0;
chushengyuan 0:2885d4453e88 179
chushengyuan 0:2885d4453e88 180 /**Draw lines of the body of arrows.*/
chushengyuan 0:2885d4453e88 181 lcd.drawLine(58,6,58,16,1);
chushengyuan 0:2885d4453e88 182 lcd.drawLine(17,11,29,11,1);
chushengyuan 0:2885d4453e88 183 lcd.refresh();
chushengyuan 0:2885d4453e88 184
chushengyuan 0:2885d4453e88 185 /**Pixes will be set if the angle in Y dimension is larger than 0 degree.*/
chushengyuan 0:2885d4453e88 186 if (Ay>=0){
chushengyuan 0:2885d4453e88 187 lcd.setPixel(60,5);
chushengyuan 0:2885d4453e88 188 lcd.setPixel(59,5);
chushengyuan 0:2885d4453e88 189 lcd.setPixel(58,5);
chushengyuan 0:2885d4453e88 190 lcd.setPixel(57,5);
chushengyuan 0:2885d4453e88 191 lcd.setPixel(56,5);
chushengyuan 0:2885d4453e88 192 lcd.setPixel(59,4);
chushengyuan 0:2885d4453e88 193 lcd.setPixel(58,4);
chushengyuan 0:2885d4453e88 194 lcd.setPixel(57,4);
chushengyuan 0:2885d4453e88 195 lcd.setPixel(58,3);
chushengyuan 0:2885d4453e88 196 lcd.refresh();
chushengyuan 0:2885d4453e88 197 }
chushengyuan 0:2885d4453e88 198
chushengyuan 0:2885d4453e88 199 /**Pixes will be set if the angle in Y dimension is smaller than 0 degree.*/
chushengyuan 0:2885d4453e88 200 else if (Ay<=0) {
chushengyuan 0:2885d4453e88 201 lcd.setPixel(60,17);
chushengyuan 0:2885d4453e88 202 lcd.setPixel(59,17);
chushengyuan 0:2885d4453e88 203 lcd.setPixel(58,17);
chushengyuan 0:2885d4453e88 204 lcd.setPixel(57,17);
chushengyuan 0:2885d4453e88 205 lcd.setPixel(56,17);
chushengyuan 0:2885d4453e88 206 lcd.setPixel(59,18);
chushengyuan 0:2885d4453e88 207 lcd.setPixel(58,18);
chushengyuan 0:2885d4453e88 208 lcd.setPixel(57,18);
chushengyuan 0:2885d4453e88 209 lcd.setPixel(58,19);
chushengyuan 0:2885d4453e88 210 lcd.refresh();
chushengyuan 0:2885d4453e88 211 }
chushengyuan 0:2885d4453e88 212
chushengyuan 0:2885d4453e88 213 /**Pixes will be set if the angle in X dimension is larger than 0 degree.*/
chushengyuan 0:2885d4453e88 214 if (Ax>=0) {
chushengyuan 0:2885d4453e88 215 lcd.setPixel(30,13);
chushengyuan 0:2885d4453e88 216 lcd.setPixel(30,12);
chushengyuan 0:2885d4453e88 217 lcd.setPixel(30,11);
chushengyuan 0:2885d4453e88 218 lcd.setPixel(30,10);
chushengyuan 0:2885d4453e88 219 lcd.setPixel(30,9);
chushengyuan 0:2885d4453e88 220 lcd.setPixel(31,12);
chushengyuan 0:2885d4453e88 221 lcd.setPixel(31,11);
chushengyuan 0:2885d4453e88 222 lcd.setPixel(31,10);
chushengyuan 0:2885d4453e88 223 lcd.setPixel(32,11);
chushengyuan 0:2885d4453e88 224 lcd.refresh();
chushengyuan 0:2885d4453e88 225 }
chushengyuan 0:2885d4453e88 226
chushengyuan 0:2885d4453e88 227 /**Pixes will be set if the angle in X dimension is smaller than 0 degree.*/
chushengyuan 0:2885d4453e88 228 else if (Ax<=0) {
chushengyuan 0:2885d4453e88 229 lcd.setPixel(16,13);
chushengyuan 0:2885d4453e88 230 lcd.setPixel(16,12);
chushengyuan 0:2885d4453e88 231 lcd.setPixel(16,11);
chushengyuan 0:2885d4453e88 232 lcd.setPixel(16,10);
chushengyuan 0:2885d4453e88 233 lcd.setPixel(16,9);
chushengyuan 0:2885d4453e88 234 lcd.setPixel(15,12);
chushengyuan 0:2885d4453e88 235 lcd.setPixel(15,11);
chushengyuan 0:2885d4453e88 236 lcd.setPixel(15,10);
chushengyuan 0:2885d4453e88 237 lcd.setPixel(14,11);
chushengyuan 0:2885d4453e88 238 lcd.refresh();
chushengyuan 0:2885d4453e88 239 }
chushengyuan 0:2885d4453e88 240
chushengyuan 0:2885d4453e88 241 /**Decrease the fluctuation of values.*/
chushengyuan 0:2885d4453e88 242 wait(0.3);
chushengyuan 0:2885d4453e88 243 lcd.clear();
chushengyuan 0:2885d4453e88 244
chushengyuan 0:2885d4453e88 245 /**Buzzer will beep in frequency 2 if the angle is between 50 and 75 degree.*/
chushengyuan 0:2885d4453e88 246 if ((abs(Ax) >= 50 && abs(Ax) < 75)||(abs(Ay) >= 50 && abs(Ay) < 75)) {
chushengyuan 0:2885d4453e88 247 buzzer.period(1/frequency2);
chushengyuan 0:2885d4453e88 248 buzzer=0.1;
chushengyuan 0:2885d4453e88 249 }
chushengyuan 0:2885d4453e88 250
chushengyuan 0:2885d4453e88 251 /**Buzzer will beep in frequency 3 if the angle is beyond 75 degree.*/
chushengyuan 0:2885d4453e88 252 else if ((abs(Ax) >= 75)||(abs(Ay) >= 75)) {
chushengyuan 0:2885d4453e88 253 buzzer.period(1/frequency3);
chushengyuan 0:2885d4453e88 254 buzzer=0.1;
chushengyuan 0:2885d4453e88 255 }
chushengyuan 0:2885d4453e88 256
chushengyuan 0:2885d4453e88 257 /**Buzzer will not beep.*/
chushengyuan 0:2885d4453e88 258 else {
chushengyuan 0:2885d4453e88 259 buzzer.period(1/frequency1);
chushengyuan 0:2885d4453e88 260 buzzer=0;
chushengyuan 0:2885d4453e88 261 }
chushengyuan 0:2885d4453e88 262 }
chushengyuan 0:2885d4453e88 263
chushengyuan 0:2885d4453e88 264 /**When button is pushed, main features will stop.*/
chushengyuan 0:2885d4453e88 265 while(pb) {
chushengyuan 0:2885d4453e88 266 break;
chushengyuan 0:2885d4453e88 267 }
chushengyuan 0:2885d4453e88 268 }
chushengyuan 0:2885d4453e88 269
chushengyuan 0:2885d4453e88 270 /**
chushengyuan 0:2885d4453e88 271 @brief Indicate the gradient in all directions by showing
chushengyuan 0:2885d4453e88 272 @brief the position of a group of pixes.
chushengyuan 0:2885d4453e88 273 */
chushengyuan 1:f167423f6f0c 274 void SpiritLevel()
chushengyuan 0:2885d4453e88 275 {
chushengyuan 0:2885d4453e88 276 /**Initialise all the LEDs to be off.*/
chushengyuan 0:2885d4453e88 277 ledA=0;
chushengyuan 0:2885d4453e88 278 ledB=0;
chushengyuan 0:2885d4453e88 279 ledC=0;
chushengyuan 0:2885d4453e88 280 ledD=0;
chushengyuan 0:2885d4453e88 281
chushengyuan 0:2885d4453e88 282 /**Set the LCD to inverse mode and lower down the brightness to 0.5.*/
chushengyuan 0:2885d4453e88 283 lcd.clear();
chushengyuan 0:2885d4453e88 284 lcd.inverseMode();
chushengyuan 0:2885d4453e88 285 lcd.setBrightness(0.5);
chushengyuan 0:2885d4453e88 286
chushengyuan 0:2885d4453e88 287 /**Initialise the accelerometer.*/
chushengyuan 0:2885d4453e88 288 mma8452.init();
chushengyuan 0:2885d4453e88 289 Acceleration acceleration;
chushengyuan 0:2885d4453e88 290
chushengyuan 1:f167423f6f0c 291 /**When button is not pushed, main features of Spirit Level will be run.*/
chushengyuan 0:2885d4453e88 292 while(!pb) {
chushengyuan 0:2885d4453e88 293
chushengyuan 0:2885d4453e88 294 /**Read value of acceleration.*/
chushengyuan 0:2885d4453e88 295 acceleration = mma8452.readValues();//read value of acceleration
chushengyuan 0:2885d4453e88 296
chushengyuan 0:2885d4453e88 297 float Ax=acceleration.x;
chushengyuan 0:2885d4453e88 298 float Ay=acceleration.y;
chushengyuan 0:2885d4453e88 299
chushengyuan 0:2885d4453e88 300 /**Draw three circles and two lines.*/
chushengyuan 0:2885d4453e88 301 lcd.drawCircle(41,24,23,0);
chushengyuan 0:2885d4453e88 302 lcd.drawCircle(41,24,4,0);
chushengyuan 0:2885d4453e88 303 lcd.drawCircle(41,24,13,0);
chushengyuan 0:2885d4453e88 304 lcd.drawLine(41,3,41,45,1);
chushengyuan 0:2885d4453e88 305 lcd.drawLine(20,24,62,24,1);
chushengyuan 0:2885d4453e88 306 lcd.refresh();
chushengyuan 0:2885d4453e88 307
chushengyuan 0:2885d4453e88 308 /**Pixes will be displayed if acceleration values are within -0.4 and 0.4.*/
chushengyuan 0:2885d4453e88 309 if (abs(Ax)<=0.4&&abs(Ay)<=0.4) {
chushengyuan 0:2885d4453e88 310
chushengyuan 0:2885d4453e88 311 float X=Ax/0.018;
chushengyuan 0:2885d4453e88 312 float Y=Ay/0.018;
chushengyuan 0:2885d4453e88 313
chushengyuan 0:2885d4453e88 314 lcd.setPixel(42+X, 26-Y);
chushengyuan 0:2885d4453e88 315 lcd.setPixel(41+X, 26-Y);
chushengyuan 0:2885d4453e88 316 lcd.setPixel(40+X, 26-Y);
chushengyuan 0:2885d4453e88 317 lcd.setPixel(43+X, 25-Y);
chushengyuan 0:2885d4453e88 318 lcd.setPixel(42+X, 25-Y);
chushengyuan 0:2885d4453e88 319 lcd.setPixel(41+X, 25-Y);
chushengyuan 0:2885d4453e88 320 lcd.setPixel(40+X, 25-Y);
chushengyuan 0:2885d4453e88 321 lcd.setPixel(39+X, 25-Y);
chushengyuan 0:2885d4453e88 322 lcd.setPixel(43+X, 24-Y);
chushengyuan 0:2885d4453e88 323 lcd.setPixel(42+X, 24-Y);
chushengyuan 0:2885d4453e88 324 lcd.setPixel(41+X, 24-Y);
chushengyuan 0:2885d4453e88 325 lcd.setPixel(40+X, 24-Y);
chushengyuan 0:2885d4453e88 326 lcd.setPixel(39+X, 24-Y);
chushengyuan 0:2885d4453e88 327 lcd.setPixel(43+X, 23-Y);
chushengyuan 0:2885d4453e88 328 lcd.setPixel(42+X, 23-Y);
chushengyuan 0:2885d4453e88 329 lcd.setPixel(41+X, 23-Y);
chushengyuan 0:2885d4453e88 330 lcd.setPixel(40+X, 23-Y);
chushengyuan 0:2885d4453e88 331 lcd.setPixel(39+X, 23-Y);
chushengyuan 0:2885d4453e88 332 lcd.setPixel(42+X, 22-Y);
chushengyuan 0:2885d4453e88 333 lcd.setPixel(41+X, 22-Y);
chushengyuan 0:2885d4453e88 334 lcd.setPixel(40+X, 22-Y);
chushengyuan 0:2885d4453e88 335 lcd.refresh();
chushengyuan 0:2885d4453e88 336
chushengyuan 0:2885d4453e88 337 /**Displayed pixes will be cleared after 0.2 second.*/
chushengyuan 0:2885d4453e88 338 wait(0.2);
chushengyuan 0:2885d4453e88 339
chushengyuan 0:2885d4453e88 340 lcd.clearPixel(42+X, 26-Y);
chushengyuan 0:2885d4453e88 341 lcd.clearPixel(41+X, 26-Y);
chushengyuan 0:2885d4453e88 342 lcd.clearPixel(40+X, 26-Y);
chushengyuan 0:2885d4453e88 343 lcd.clearPixel(43+X, 25-Y);
chushengyuan 0:2885d4453e88 344 lcd.clearPixel(42+X, 25-Y);
chushengyuan 0:2885d4453e88 345 lcd.clearPixel(41+X, 25-Y);
chushengyuan 0:2885d4453e88 346 lcd.clearPixel(40+X, 25-Y);
chushengyuan 0:2885d4453e88 347 lcd.clearPixel(39+X, 25-Y);
chushengyuan 0:2885d4453e88 348 lcd.clearPixel(43+X, 24-Y);
chushengyuan 0:2885d4453e88 349 lcd.clearPixel(42+X, 24-Y);
chushengyuan 0:2885d4453e88 350 lcd.clearPixel(41+X, 24-Y);
chushengyuan 0:2885d4453e88 351 lcd.clearPixel(40+X, 24-Y);
chushengyuan 0:2885d4453e88 352 lcd.clearPixel(39+X, 24-Y);
chushengyuan 0:2885d4453e88 353 lcd.clearPixel(43+X, 23-Y);
chushengyuan 0:2885d4453e88 354 lcd.clearPixel(42+X, 23-Y);
chushengyuan 0:2885d4453e88 355 lcd.clearPixel(41+X, 23-Y);
chushengyuan 0:2885d4453e88 356 lcd.clearPixel(40+X, 23-Y);
chushengyuan 0:2885d4453e88 357 lcd.clearPixel(39+X, 23-Y);
chushengyuan 0:2885d4453e88 358 lcd.clearPixel(42+X, 22-Y);
chushengyuan 0:2885d4453e88 359 lcd.clearPixel(41+X, 22-Y);
chushengyuan 0:2885d4453e88 360 lcd.clearPixel(40+X, 22-Y);
chushengyuan 0:2885d4453e88 361 lcd.refresh();
chushengyuan 0:2885d4453e88 362 }
chushengyuan 0:2885d4453e88 363
chushengyuan 0:2885d4453e88 364 /**All LEDs will be turned on if acceleration values are within -0.05 and 0.05.*/
chushengyuan 0:2885d4453e88 365 if (abs(Ax)<=0.05&&abs(Ay)<=0.05) {
chushengyuan 0:2885d4453e88 366 ledA=1;
chushengyuan 0:2885d4453e88 367 ledB=1;
chushengyuan 0:2885d4453e88 368 ledC=1;
chushengyuan 0:2885d4453e88 369 ledD=1;
chushengyuan 0:2885d4453e88 370 }
chushengyuan 0:2885d4453e88 371
chushengyuan 0:2885d4453e88 372 /**All LEDs will be turned off if acceleration values go beyond this range.*/
chushengyuan 0:2885d4453e88 373 else {
chushengyuan 0:2885d4453e88 374 ledA=0;
chushengyuan 0:2885d4453e88 375 ledB=0;
chushengyuan 0:2885d4453e88 376 ledC=0;
chushengyuan 0:2885d4453e88 377 ledD=0;
chushengyuan 0:2885d4453e88 378 }
chushengyuan 0:2885d4453e88 379 }
chushengyuan 0:2885d4453e88 380 }
chushengyuan 0:2885d4453e88 381
chushengyuan 0:2885d4453e88 382 /**
chushengyuan 0:2885d4453e88 383 @brief Display the function name of Angle Meter for 1 second before calling it.
chushengyuan 0:2885d4453e88 384 */
chushengyuan 0:2885d4453e88 385 void fun1()
chushengyuan 0:2885d4453e88 386 {
chushengyuan 0:2885d4453e88 387 /**Initialise the LCD and set brightness to 0.8.*/
chushengyuan 0:2885d4453e88 388 lcd.init();
chushengyuan 0:2885d4453e88 389 lcd.normalMode();
chushengyuan 0:2885d4453e88 390 lcd.setBrightness(0.8);
chushengyuan 0:2885d4453e88 391 lcd.clear();
chushengyuan 0:2885d4453e88 392
chushengyuan 0:2885d4453e88 393 /**Display the function name of Angle Meter.*/
chushengyuan 0:2885d4453e88 394 lcd.printString("Electronic",12,2);
chushengyuan 0:2885d4453e88 395 lcd.printString("Angle Meter",10,3);
chushengyuan 0:2885d4453e88 396
chushengyuan 0:2885d4453e88 397 /**Turn LED A and LED C on.*/
chushengyuan 0:2885d4453e88 398 ledA=1;
chushengyuan 0:2885d4453e88 399 ledB=0;
chushengyuan 0:2885d4453e88 400 ledC=1;
chushengyuan 0:2885d4453e88 401 ledD=0;
chushengyuan 0:2885d4453e88 402
chushengyuan 0:2885d4453e88 403 /**Call function of Angle Meter after 1 second delay.*/
chushengyuan 0:2885d4453e88 404 flipper.attach(&AngleMeter, 1.0);
chushengyuan 0:2885d4453e88 405 }
chushengyuan 0:2885d4453e88 406
chushengyuan 0:2885d4453e88 407 /**
chushengyuan 1:f167423f6f0c 408 @brief Display the function name of Spirit Level for 1 second before calling it.
chushengyuan 0:2885d4453e88 409 */
chushengyuan 0:2885d4453e88 410 void fun2()
chushengyuan 0:2885d4453e88 411 {
chushengyuan 0:2885d4453e88 412 /**Turn off the buzzer.*/
chushengyuan 0:2885d4453e88 413 buzzer = 0;
chushengyuan 0:2885d4453e88 414
chushengyuan 0:2885d4453e88 415 /**Initialise the LCD and set brightness to 0.8.*/
chushengyuan 0:2885d4453e88 416 lcd.init();
chushengyuan 0:2885d4453e88 417 lcd.normalMode();
chushengyuan 0:2885d4453e88 418 lcd.setBrightness(0.8);
chushengyuan 0:2885d4453e88 419 lcd.clear();
chushengyuan 0:2885d4453e88 420
chushengyuan 1:f167423f6f0c 421 /**Display the function name of Spirit Level.*/
chushengyuan 0:2885d4453e88 422 lcd.printString("Electronic",12,2);
chushengyuan 1:f167423f6f0c 423 lcd.printString("Spirit Level",7,3);
chushengyuan 0:2885d4453e88 424
chushengyuan 0:2885d4453e88 425 /**Turn LED B and LED D on.*/
chushengyuan 0:2885d4453e88 426 ledA=0;
chushengyuan 0:2885d4453e88 427 ledB=1;
chushengyuan 0:2885d4453e88 428 ledC=0;
chushengyuan 0:2885d4453e88 429 ledD=1;
chushengyuan 0:2885d4453e88 430
chushengyuan 1:f167423f6f0c 431 /**Call function of Spirit Level after 1 second delay.*/
chushengyuan 1:f167423f6f0c 432 flipper.attach(&SpiritLevel, 1.0);
chushengyuan 0:2885d4453e88 433 }
chushengyuan 0:2885d4453e88 434
chushengyuan 0:2885d4453e88 435 /**
chushengyuan 0:2885d4453e88 436 @brief Power down the Ethernet interface to save power.
chushengyuan 0:2885d4453e88 437 @brief Acknowledgements to Michael Wei's code.
chushengyuan 0:2885d4453e88 438 */
chushengyuan 0:2885d4453e88 439 void PHY_PowerDown()
chushengyuan 0:2885d4453e88 440 {
chushengyuan 0:2885d4453e88 441 if (!Peripheral_GetStatus(LPC1768_PCONP_PCENET))
chushengyuan 0:2885d4453e88 442 EMAC_Init(); //init EMAC if it is not already init'd
chushengyuan 0:2885d4453e88 443
chushengyuan 0:2885d4453e88 444 unsigned int regv;
chushengyuan 0:2885d4453e88 445 regv = read_PHY(PHY_REG_BMCR);
chushengyuan 0:2885d4453e88 446 write_PHY(PHY_REG_BMCR, regv | (1 << PHY_REG_BMCR_POWERDOWN));
chushengyuan 0:2885d4453e88 447 regv = read_PHY(PHY_REG_BMCR);
chushengyuan 0:2885d4453e88 448
chushengyuan 0:2885d4453e88 449 //shouldn't need the EMAC now.
chushengyuan 0:2885d4453e88 450 Peripheral_PowerDown(LPC1768_PCONP_PCENET);
chushengyuan 0:2885d4453e88 451
chushengyuan 0:2885d4453e88 452 //and turn off the PHY OSC
chushengyuan 0:2885d4453e88 453 LPC_GPIO1->FIODIR |= 0x8000000;
chushengyuan 0:2885d4453e88 454 LPC_GPIO1->FIOCLR = 0x8000000;
chushengyuan 0:2885d4453e88 455 }
chushengyuan 0:2885d4453e88 456
chushengyuan 0:2885d4453e88 457 static void write_PHY (unsigned int PhyReg, unsigned short Value) {
chushengyuan 0:2885d4453e88 458 /* Write a data 'Value' to PHY register 'PhyReg'. */
chushengyuan 0:2885d4453e88 459 unsigned int tout;
chushengyuan 0:2885d4453e88 460 /* Hardware MII Management for LPC176x devices. */
chushengyuan 0:2885d4453e88 461 LPC_EMAC->MADR = DP83848C_DEF_ADR | PhyReg;
chushengyuan 0:2885d4453e88 462 LPC_EMAC->MWTD = Value;
chushengyuan 0:2885d4453e88 463
chushengyuan 0:2885d4453e88 464 /* Wait utill operation completed */
chushengyuan 0:2885d4453e88 465 for (tout = 0; tout < MII_WR_TOUT; tout++) {
chushengyuan 0:2885d4453e88 466 if ((LPC_EMAC->MIND & MIND_BUSY) == 0) {
chushengyuan 0:2885d4453e88 467 break;
chushengyuan 0:2885d4453e88 468 }
chushengyuan 0:2885d4453e88 469 }
chushengyuan 0:2885d4453e88 470 }
chushengyuan 0:2885d4453e88 471
chushengyuan 0:2885d4453e88 472 static unsigned short read_PHY (unsigned int PhyReg) {
chushengyuan 0:2885d4453e88 473 /* Read a PHY register 'PhyReg'. */
chushengyuan 0:2885d4453e88 474 unsigned int tout, val;
chushengyuan 0:2885d4453e88 475
chushengyuan 0:2885d4453e88 476 LPC_EMAC->MADR = DP83848C_DEF_ADR | PhyReg;
chushengyuan 0:2885d4453e88 477 LPC_EMAC->MCMD = MCMD_READ;
chushengyuan 0:2885d4453e88 478
chushengyuan 0:2885d4453e88 479 /* Wait until operation completed */
chushengyuan 0:2885d4453e88 480 for (tout = 0; tout < MII_RD_TOUT; tout++) {
chushengyuan 0:2885d4453e88 481 if ((LPC_EMAC->MIND & MIND_BUSY) == 0) {
chushengyuan 0:2885d4453e88 482 break;
chushengyuan 0:2885d4453e88 483 }
chushengyuan 0:2885d4453e88 484 }
chushengyuan 0:2885d4453e88 485 LPC_EMAC->MCMD = 0;
chushengyuan 0:2885d4453e88 486 val = LPC_EMAC->MRDD;
chushengyuan 0:2885d4453e88 487
chushengyuan 0:2885d4453e88 488 return (val);
chushengyuan 0:2885d4453e88 489 }
chushengyuan 0:2885d4453e88 490
chushengyuan 0:2885d4453e88 491 void EMAC_Init()
chushengyuan 0:2885d4453e88 492 {
chushengyuan 0:2885d4453e88 493 unsigned int tout,regv;
chushengyuan 0:2885d4453e88 494 /* Power Up the EMAC controller. */
chushengyuan 0:2885d4453e88 495 Peripheral_PowerUp(LPC1768_PCONP_PCENET);
chushengyuan 0:2885d4453e88 496
chushengyuan 0:2885d4453e88 497 LPC_PINCON->PINSEL2 = 0x50150105;
chushengyuan 0:2885d4453e88 498 LPC_PINCON->PINSEL3 &= ~0x0000000F;
chushengyuan 0:2885d4453e88 499 LPC_PINCON->PINSEL3 |= 0x00000005;
chushengyuan 0:2885d4453e88 500
chushengyuan 0:2885d4453e88 501 /* Reset all EMAC internal modules. */
chushengyuan 0:2885d4453e88 502 LPC_EMAC->MAC1 = MAC1_RES_TX | MAC1_RES_MCS_TX | MAC1_RES_RX | MAC1_RES_MCS_RX |
chushengyuan 0:2885d4453e88 503 MAC1_SIM_RES | MAC1_SOFT_RES;
chushengyuan 0:2885d4453e88 504 LPC_EMAC->Command = CR_REG_RES | CR_TX_RES | CR_RX_RES;
chushengyuan 0:2885d4453e88 505
chushengyuan 0:2885d4453e88 506 /* A short delay after reset. */
chushengyuan 0:2885d4453e88 507 for (tout = 100; tout; tout--);
chushengyuan 0:2885d4453e88 508
chushengyuan 0:2885d4453e88 509 /* Initialize MAC control registers. */
chushengyuan 0:2885d4453e88 510 LPC_EMAC->MAC1 = MAC1_PASS_ALL;
chushengyuan 0:2885d4453e88 511 LPC_EMAC->MAC2 = MAC2_CRC_EN | MAC2_PAD_EN;
chushengyuan 0:2885d4453e88 512 LPC_EMAC->MAXF = ETH_MAX_FLEN;
chushengyuan 0:2885d4453e88 513 LPC_EMAC->CLRT = CLRT_DEF;
chushengyuan 0:2885d4453e88 514 LPC_EMAC->IPGR = IPGR_DEF;
chushengyuan 0:2885d4453e88 515
chushengyuan 0:2885d4453e88 516 /* Enable Reduced MII interface. */
chushengyuan 0:2885d4453e88 517 LPC_EMAC->Command = CR_RMII | CR_PASS_RUNT_FRM;
chushengyuan 0:2885d4453e88 518
chushengyuan 0:2885d4453e88 519 /* Reset Reduced MII Logic. */
chushengyuan 0:2885d4453e88 520 LPC_EMAC->SUPP = SUPP_RES_RMII;
chushengyuan 0:2885d4453e88 521 for (tout = 100; tout; tout--);
chushengyuan 0:2885d4453e88 522 LPC_EMAC->SUPP = 0;
chushengyuan 0:2885d4453e88 523
chushengyuan 0:2885d4453e88 524 /* Put the DP83848C in reset mode */
chushengyuan 0:2885d4453e88 525 write_PHY (PHY_REG_BMCR, 0x8000);
chushengyuan 0:2885d4453e88 526
chushengyuan 0:2885d4453e88 527 /* Wait for hardware reset to end. */
chushengyuan 0:2885d4453e88 528 for (tout = 0; tout < 0x100000; tout++) {
chushengyuan 0:2885d4453e88 529 regv = read_PHY (PHY_REG_BMCR);
chushengyuan 0:2885d4453e88 530 if (!(regv & 0x8000)) {
chushengyuan 0:2885d4453e88 531 /* Reset complete */
chushengyuan 0:2885d4453e88 532 break;
chushengyuan 0:2885d4453e88 533 }
chushengyuan 0:2885d4453e88 534 }
chushengyuan 0:2885d4453e88 535 }
chushengyuan 0:2885d4453e88 536
chushengyuan 0:2885d4453e88 537 /**
chushengyuan 0:2885d4453e88 538 @brief Functions used to display characters and shapes.
chushengyuan 0:2885d4453e88 539 @brief Acknowledgements to Dr.Craig A. Evans's code.
chushengyuan 0:2885d4453e88 540 */
chushengyuan 0:2885d4453e88 541 N5110::N5110(PinName pwrPin, PinName scePin, PinName rstPin, PinName dcPin, PinName mosiPin, PinName sclkPin, PinName ledPin)
chushengyuan 0:2885d4453e88 542 {
chushengyuan 0:2885d4453e88 543
chushengyuan 0:2885d4453e88 544 spi = new SPI(mosiPin,NC,sclkPin); // create new SPI instance and initialise
chushengyuan 0:2885d4453e88 545 initSPI();
chushengyuan 0:2885d4453e88 546
chushengyuan 0:2885d4453e88 547 // set up pins as required
chushengyuan 0:2885d4453e88 548 led = new PwmOut(ledPin);
chushengyuan 0:2885d4453e88 549 pwr = new DigitalOut(pwrPin);
chushengyuan 0:2885d4453e88 550 sce = new DigitalOut(scePin);
chushengyuan 0:2885d4453e88 551 rst = new DigitalOut(rstPin);
chushengyuan 0:2885d4453e88 552 dc = new DigitalOut(dcPin);
chushengyuan 0:2885d4453e88 553
chushengyuan 0:2885d4453e88 554 }
chushengyuan 0:2885d4453e88 555
chushengyuan 0:2885d4453e88 556 // initialise function - powers up and sends the initialisation commands
chushengyuan 0:2885d4453e88 557 void N5110::init()
chushengyuan 0:2885d4453e88 558 {
chushengyuan 0:2885d4453e88 559 turnOn(); // power up
chushengyuan 0:2885d4453e88 560 wait_ms(10); // small delay seems to prevent spurious pixels during mbed reset
chushengyuan 0:2885d4453e88 561 reset(); // reset LCD - must be done within 100 ms
chushengyuan 0:2885d4453e88 562
chushengyuan 0:2885d4453e88 563 // function set - extended
chushengyuan 0:2885d4453e88 564 sendCommand(0x20 | CMD_FS_ACTIVE_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_EXTENDED_MODE);
chushengyuan 0:2885d4453e88 565 // Don't completely understand these parameters - they seem to work as they are
chushengyuan 0:2885d4453e88 566 // Consult the datasheet if you need to change them
chushengyuan 0:2885d4453e88 567 sendCommand(CMD_VOP_7V38); // operating voltage - these values are from Chris Yan's Library
chushengyuan 0:2885d4453e88 568 sendCommand(CMD_TC_TEMP_2); // temperature control
chushengyuan 0:2885d4453e88 569 sendCommand(CMD_BI_MUX_48); // bias
chushengyuan 0:2885d4453e88 570
chushengyuan 0:2885d4453e88 571 // function set - basic
chushengyuan 0:2885d4453e88 572 sendCommand(0x20 | CMD_FS_ACTIVE_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_BASIC_MODE);
chushengyuan 0:2885d4453e88 573 normalMode(); // normal video mode by default
chushengyuan 0:2885d4453e88 574 sendCommand(CMD_DC_NORMAL_MODE); // black on white
chushengyuan 0:2885d4453e88 575
chushengyuan 0:2885d4453e88 576 // RAM is undefined at power-up so clear
chushengyuan 0:2885d4453e88 577 clearRAM();
chushengyuan 0:2885d4453e88 578
chushengyuan 0:2885d4453e88 579 }
chushengyuan 0:2885d4453e88 580
chushengyuan 0:2885d4453e88 581 // sets normal video mode (black on white)
chushengyuan 0:2885d4453e88 582 void N5110::normalMode()
chushengyuan 0:2885d4453e88 583 {
chushengyuan 0:2885d4453e88 584 sendCommand(CMD_DC_NORMAL_MODE);
chushengyuan 0:2885d4453e88 585
chushengyuan 0:2885d4453e88 586 }
chushengyuan 0:2885d4453e88 587
chushengyuan 0:2885d4453e88 588 // sets normal video mode (white on black)
chushengyuan 0:2885d4453e88 589 void N5110::inverseMode()
chushengyuan 0:2885d4453e88 590 {
chushengyuan 0:2885d4453e88 591 sendCommand(CMD_DC_INVERT_VIDEO);
chushengyuan 0:2885d4453e88 592 }
chushengyuan 0:2885d4453e88 593
chushengyuan 0:2885d4453e88 594 // function to power up the LCD and backlight
chushengyuan 0:2885d4453e88 595 void N5110::turnOn()
chushengyuan 0:2885d4453e88 596 {
chushengyuan 0:2885d4453e88 597 // set brightness of LED - 0.0 to 1.0 - default is 50%
chushengyuan 0:2885d4453e88 598 setBrightness(0.5);
chushengyuan 0:2885d4453e88 599 pwr->write(1); // apply power
chushengyuan 0:2885d4453e88 600 }
chushengyuan 0:2885d4453e88 601
chushengyuan 0:2885d4453e88 602 // function to power down LCD
chushengyuan 0:2885d4453e88 603 void N5110::turnOff()
chushengyuan 0:2885d4453e88 604 {
chushengyuan 0:2885d4453e88 605 setBrightness(0.0); // turn backlight off
chushengyuan 0:2885d4453e88 606 clearRAM(); // clear RAM to ensure specified current consumption
chushengyuan 0:2885d4453e88 607 // send command to ensure we are in basic mode
chushengyuan 0:2885d4453e88 608 sendCommand(0x20 | CMD_FS_ACTIVE_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_BASIC_MODE);
chushengyuan 0:2885d4453e88 609 // clear the display
chushengyuan 0:2885d4453e88 610 sendCommand(CMD_DC_CLEAR_DISPLAY);
chushengyuan 0:2885d4453e88 611 // enter the extended mode and power down
chushengyuan 0:2885d4453e88 612 sendCommand(0x20 | CMD_FS_POWER_DOWN_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_EXTENDED_MODE);
chushengyuan 0:2885d4453e88 613 // small delay and then turn off the power pin
chushengyuan 0:2885d4453e88 614 wait_ms(10);
chushengyuan 0:2885d4453e88 615 pwr->write(0);
chushengyuan 0:2885d4453e88 616
chushengyuan 0:2885d4453e88 617 }
chushengyuan 0:2885d4453e88 618
chushengyuan 0:2885d4453e88 619 // function to change LED backlight brightness
chushengyuan 0:2885d4453e88 620 void N5110::setBrightness(float brightness)
chushengyuan 0:2885d4453e88 621 {
chushengyuan 0:2885d4453e88 622 // check whether brightness is within range
chushengyuan 0:2885d4453e88 623 if (brightness < 0.0)
chushengyuan 0:2885d4453e88 624 brightness = 0.0;
chushengyuan 0:2885d4453e88 625 if (brightness > 1.0)
chushengyuan 0:2885d4453e88 626 brightness = 1.0;
chushengyuan 0:2885d4453e88 627 // set PWM duty cycle
chushengyuan 0:2885d4453e88 628 led->write(brightness);
chushengyuan 0:2885d4453e88 629 }
chushengyuan 0:2885d4453e88 630
chushengyuan 0:2885d4453e88 631 // pulse the active low reset line
chushengyuan 0:2885d4453e88 632 void N5110::reset()
chushengyuan 0:2885d4453e88 633 {
chushengyuan 0:2885d4453e88 634 rst->write(0); // reset the LCD
chushengyuan 0:2885d4453e88 635 rst->write(1);
chushengyuan 0:2885d4453e88 636 }
chushengyuan 0:2885d4453e88 637
chushengyuan 0:2885d4453e88 638 // function to initialise SPI peripheral
chushengyuan 0:2885d4453e88 639 void N5110::initSPI()
chushengyuan 0:2885d4453e88 640 {
chushengyuan 0:2885d4453e88 641 spi->format(8,1); // 8 bits, Mode 1 - polarity 0, phase 1 - base value of clock is 0, data captured on falling edge/propagated on rising edge
chushengyuan 0:2885d4453e88 642 spi->frequency(4000000); // maximum of screen is 4 MHz
chushengyuan 0:2885d4453e88 643 }
chushengyuan 0:2885d4453e88 644
chushengyuan 0:2885d4453e88 645 // send a command to the display
chushengyuan 0:2885d4453e88 646 void N5110::sendCommand(unsigned char command)
chushengyuan 0:2885d4453e88 647 {
chushengyuan 0:2885d4453e88 648 dc->write(0); // set DC low for command
chushengyuan 0:2885d4453e88 649 sce->write(0); // set CE low to begin frame
chushengyuan 0:2885d4453e88 650 spi->write(command); // send command
chushengyuan 0:2885d4453e88 651 dc->write(1); // turn back to data by default
chushengyuan 0:2885d4453e88 652 sce->write(1); // set CE high to end frame (expected for transmission of single byte)
chushengyuan 0:2885d4453e88 653
chushengyuan 0:2885d4453e88 654 }
chushengyuan 0:2885d4453e88 655
chushengyuan 0:2885d4453e88 656 // this function writes 0 to the 504 bytes to clear the RAM
chushengyuan 0:2885d4453e88 657 void N5110::clearRAM()
chushengyuan 0:2885d4453e88 658 {
chushengyuan 0:2885d4453e88 659 int i;
chushengyuan 0:2885d4453e88 660 sce->write(0); //set CE low to begin frame
chushengyuan 0:2885d4453e88 661 for(i = 0; i < WIDTH * HEIGHT; i++) { // 48 x 84 bits = 504 bytes
chushengyuan 0:2885d4453e88 662 spi->write(0x00); // send 0's
chushengyuan 0:2885d4453e88 663 }
chushengyuan 0:2885d4453e88 664 sce->write(1); // set CE high to end frame
chushengyuan 0:2885d4453e88 665
chushengyuan 0:2885d4453e88 666 }
chushengyuan 0:2885d4453e88 667
chushengyuan 0:2885d4453e88 668 // function to set the XY address in RAM for subsequenct data write
chushengyuan 0:2885d4453e88 669 void N5110::setXYAddress(int x, int y)
chushengyuan 0:2885d4453e88 670 {
chushengyuan 0:2885d4453e88 671 if (x>=0 && x<WIDTH && y>=0 && y<HEIGHT) { // check within range
chushengyuan 0:2885d4453e88 672 sendCommand(0x80 | x); // send addresses to display with relevant mask
chushengyuan 0:2885d4453e88 673 sendCommand(0x40 | y);
chushengyuan 0:2885d4453e88 674 }
chushengyuan 0:2885d4453e88 675 }
chushengyuan 0:2885d4453e88 676
chushengyuan 0:2885d4453e88 677 // These functions are used to set, clear and get the value of pixels in the display
chushengyuan 0:2885d4453e88 678 // Pixels are addressed in the range of 0 to 47 (y) and 0 to 83 (x). The refresh()
chushengyuan 0:2885d4453e88 679 // function must be called after set and clear in order to update the display
chushengyuan 0:2885d4453e88 680 void N5110::setPixel(int x, int y)
chushengyuan 0:2885d4453e88 681 {
chushengyuan 0:2885d4453e88 682 if (x>=0 && x<WIDTH && y>=0 && y<HEIGHT) { // check within range
chushengyuan 0:2885d4453e88 683 // calculate bank and shift 1 to required position in the data byte
chushengyuan 0:2885d4453e88 684 buffer[x][y/8] |= (1 << y%8);
chushengyuan 0:2885d4453e88 685 }
chushengyuan 0:2885d4453e88 686 }
chushengyuan 0:2885d4453e88 687
chushengyuan 0:2885d4453e88 688 void N5110::clearPixel(int x, int y)
chushengyuan 0:2885d4453e88 689 {
chushengyuan 0:2885d4453e88 690 if (x>=0 && x<WIDTH && y>=0 && y<HEIGHT) { // check within range
chushengyuan 0:2885d4453e88 691 // calculate bank and shift 1 to required position (using bit clear)
chushengyuan 0:2885d4453e88 692 buffer[x][y/8] &= ~(1 << y%8);
chushengyuan 0:2885d4453e88 693 }
chushengyuan 0:2885d4453e88 694 }
chushengyuan 0:2885d4453e88 695
chushengyuan 0:2885d4453e88 696 // function to refresh the display
chushengyuan 0:2885d4453e88 697 void N5110::refresh()
chushengyuan 0:2885d4453e88 698 {
chushengyuan 0:2885d4453e88 699 int i,j;
chushengyuan 0:2885d4453e88 700
chushengyuan 0:2885d4453e88 701 setXYAddress(0,0); // important to set address back to 0,0 before refreshing display
chushengyuan 0:2885d4453e88 702 // address auto increments after printing string, so buffer[0][0] will not coincide
chushengyuan 0:2885d4453e88 703 // with top-left pixel after priting string
chushengyuan 0:2885d4453e88 704
chushengyuan 0:2885d4453e88 705 sce->write(0); //set CE low to begin frame
chushengyuan 0:2885d4453e88 706
chushengyuan 0:2885d4453e88 707 for(j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
chushengyuan 0:2885d4453e88 708 for(i = 0; i < WIDTH; i++) {
chushengyuan 0:2885d4453e88 709 spi->write(buffer[i][j]); // send buffer
chushengyuan 0:2885d4453e88 710 }
chushengyuan 0:2885d4453e88 711 }
chushengyuan 0:2885d4453e88 712 sce->write(1); // set CE high to end frame
chushengyuan 0:2885d4453e88 713
chushengyuan 0:2885d4453e88 714 }
chushengyuan 0:2885d4453e88 715
chushengyuan 0:2885d4453e88 716 // function to print string at specified position
chushengyuan 0:2885d4453e88 717 void N5110::printString(const char * str,int x,int y)
chushengyuan 0:2885d4453e88 718 {
chushengyuan 0:2885d4453e88 719 if (y>=0 && y<BANKS) { // check if printing in range of y banks
chushengyuan 0:2885d4453e88 720
chushengyuan 0:2885d4453e88 721 int n = 0 ; // counter for number of characters in string
chushengyuan 0:2885d4453e88 722 // loop through string and print character
chushengyuan 0:2885d4453e88 723 while(*str) {
chushengyuan 0:2885d4453e88 724
chushengyuan 0:2885d4453e88 725 // writes the character bitmap data to the buffer, so that
chushengyuan 0:2885d4453e88 726 // text and pixels can be displayed at the same time
chushengyuan 0:2885d4453e88 727 for (int i = 0; i < 5 ; i++ ) {
chushengyuan 0:2885d4453e88 728 int pixel_x = x+i+n*6;
chushengyuan 0:2885d4453e88 729 if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83)
chushengyuan 0:2885d4453e88 730 break;
chushengyuan 0:2885d4453e88 731 buffer[pixel_x][y] = font5x7[(*str - 32)*5 + i];
chushengyuan 0:2885d4453e88 732 }
chushengyuan 0:2885d4453e88 733
chushengyuan 0:2885d4453e88 734 str++; // go to next character in string
chushengyuan 0:2885d4453e88 735
chushengyuan 0:2885d4453e88 736 n++; // increment index
chushengyuan 0:2885d4453e88 737
chushengyuan 0:2885d4453e88 738 }
chushengyuan 0:2885d4453e88 739
chushengyuan 0:2885d4453e88 740 refresh(); // this sends the buffer to the display and sets address (cursor) back to 0,0
chushengyuan 0:2885d4453e88 741 }
chushengyuan 0:2885d4453e88 742 }
chushengyuan 0:2885d4453e88 743
chushengyuan 0:2885d4453e88 744 // function to clear the screen
chushengyuan 0:2885d4453e88 745 void N5110::clear()
chushengyuan 0:2885d4453e88 746 {
chushengyuan 0:2885d4453e88 747 clearBuffer(); // clear the buffer then call the refresh function
chushengyuan 0:2885d4453e88 748 refresh();
chushengyuan 0:2885d4453e88 749 }
chushengyuan 0:2885d4453e88 750
chushengyuan 0:2885d4453e88 751 // function to clear the buffer
chushengyuan 0:2885d4453e88 752 void N5110::clearBuffer()
chushengyuan 0:2885d4453e88 753 {
chushengyuan 0:2885d4453e88 754 int i,j;
chushengyuan 0:2885d4453e88 755 for (i=0; i<WIDTH; i++) { // loop through the banks and set the buffer to 0
chushengyuan 0:2885d4453e88 756 for (j=0; j<BANKS; j++) {
chushengyuan 0:2885d4453e88 757 buffer[i][j]=0;
chushengyuan 0:2885d4453e88 758 }
chushengyuan 0:2885d4453e88 759 }
chushengyuan 0:2885d4453e88 760 }
chushengyuan 0:2885d4453e88 761
chushengyuan 0:2885d4453e88 762 // function to draw circle
chushengyuan 0:2885d4453e88 763 void N5110:: drawCircle(int x0,int y0,int radius,int fill)
chushengyuan 0:2885d4453e88 764 {
chushengyuan 0:2885d4453e88 765 // from http://en.wikipedia.org/wiki/Midpoint_circle_algorithm
chushengyuan 0:2885d4453e88 766 int x = radius;
chushengyuan 0:2885d4453e88 767 int y = 0;
chushengyuan 0:2885d4453e88 768 int radiusError = 1-x;
chushengyuan 0:2885d4453e88 769
chushengyuan 0:2885d4453e88 770 while(x >= y) {
chushengyuan 0:2885d4453e88 771
chushengyuan 0:2885d4453e88 772 // if transparent, just draw outline
chushengyuan 0:2885d4453e88 773 if (fill == 0) {
chushengyuan 0:2885d4453e88 774 setPixel( x + x0, y + y0);
chushengyuan 0:2885d4453e88 775 setPixel(-x + x0, y + y0);
chushengyuan 0:2885d4453e88 776 setPixel( y + x0, x + y0);
chushengyuan 0:2885d4453e88 777 setPixel(-y + x0, x + y0);
chushengyuan 0:2885d4453e88 778 setPixel(-y + x0, -x + y0);
chushengyuan 0:2885d4453e88 779 setPixel( y + x0, -x + y0);
chushengyuan 0:2885d4453e88 780 setPixel( x + x0, -y + y0);
chushengyuan 0:2885d4453e88 781 setPixel(-x + x0, -y + y0);
chushengyuan 0:2885d4453e88 782 } else { // drawing filled circle, so draw lines between points at same y value
chushengyuan 0:2885d4453e88 783
chushengyuan 0:2885d4453e88 784 int type = (fill==1) ? 1:0; // black or white fill
chushengyuan 0:2885d4453e88 785
chushengyuan 0:2885d4453e88 786 drawLine(x+x0,y+y0,-x+x0,y+y0,type);
chushengyuan 0:2885d4453e88 787 drawLine(y+x0,x+y0,-y+x0,x+y0,type);
chushengyuan 0:2885d4453e88 788 drawLine(y+x0,-x+y0,-y+x0,-x+y0,type);
chushengyuan 0:2885d4453e88 789 drawLine(x+x0,-y+y0,-x+x0,-y+y0,type);
chushengyuan 0:2885d4453e88 790 }
chushengyuan 0:2885d4453e88 791
chushengyuan 0:2885d4453e88 792
chushengyuan 0:2885d4453e88 793 y++;
chushengyuan 0:2885d4453e88 794 if (radiusError<0) {
chushengyuan 0:2885d4453e88 795 radiusError += 2 * y + 1;
chushengyuan 0:2885d4453e88 796 } else {
chushengyuan 0:2885d4453e88 797 x--;
chushengyuan 0:2885d4453e88 798 radiusError += 2 * (y - x) + 1;
chushengyuan 0:2885d4453e88 799 }
chushengyuan 0:2885d4453e88 800 }
chushengyuan 0:2885d4453e88 801
chushengyuan 0:2885d4453e88 802 }
chushengyuan 0:2885d4453e88 803
chushengyuan 0:2885d4453e88 804 void N5110::drawLine(int x0,int y0,int x1,int y1,int type)
chushengyuan 0:2885d4453e88 805 {
chushengyuan 0:2885d4453e88 806 int y_range = y1-y0; // calc range of y and x
chushengyuan 0:2885d4453e88 807 int x_range = x1-x0;
chushengyuan 0:2885d4453e88 808 int start,stop,step;
chushengyuan 0:2885d4453e88 809
chushengyuan 0:2885d4453e88 810 // if dotted line, set step to 2, else step is 1
chushengyuan 0:2885d4453e88 811 step = (type==2) ? 2:1;
chushengyuan 0:2885d4453e88 812
chushengyuan 0:2885d4453e88 813 // make sure we loop over the largest range to get the most pixels on the display
chushengyuan 0:2885d4453e88 814 // for instance, if drawing a vertical line (x_range = 0), we need to loop down the y pixels
chushengyuan 0:2885d4453e88 815 // or else we'll only end up with 1 pixel in the x column
chushengyuan 0:2885d4453e88 816 if ( abs(x_range) > abs(y_range) ) {
chushengyuan 0:2885d4453e88 817
chushengyuan 0:2885d4453e88 818 // ensure we loop from smallest to largest or else for-loop won't run as expected
chushengyuan 0:2885d4453e88 819 start = x1>x0 ? x0:x1;
chushengyuan 0:2885d4453e88 820 stop = x1>x0 ? x1:x0;
chushengyuan 0:2885d4453e88 821
chushengyuan 0:2885d4453e88 822 // loop between x pixels
chushengyuan 0:2885d4453e88 823 for (int x = start; x<= stop ; x+=step) {
chushengyuan 0:2885d4453e88 824 // do linear interpolation
chushengyuan 0:2885d4453e88 825 int y = y0 + (y1-y0)*(x-x0)/(x1-x0);
chushengyuan 0:2885d4453e88 826
chushengyuan 0:2885d4453e88 827 if (type == 0) // if 'white' line, turn off pixel
chushengyuan 0:2885d4453e88 828 clearPixel(x,y);
chushengyuan 0:2885d4453e88 829 else
chushengyuan 0:2885d4453e88 830 setPixel(x,y); // else if 'black' or 'dotted' turn on pixel
chushengyuan 0:2885d4453e88 831 }
chushengyuan 0:2885d4453e88 832 } else {
chushengyuan 0:2885d4453e88 833
chushengyuan 0:2885d4453e88 834 // ensure we loop from smallest to largest or else for-loop won't run as expected
chushengyuan 0:2885d4453e88 835 start = y1>y0 ? y0:y1;
chushengyuan 0:2885d4453e88 836 stop = y1>y0 ? y1:y0;
chushengyuan 0:2885d4453e88 837
chushengyuan 0:2885d4453e88 838 for (int y = start; y<= stop ; y+=step) {
chushengyuan 0:2885d4453e88 839 // do linear interpolation
chushengyuan 0:2885d4453e88 840 int x = x0 + (x1-x0)*(y-y0)/(y1-y0);
chushengyuan 0:2885d4453e88 841
chushengyuan 0:2885d4453e88 842 if (type == 0) // if 'white' line, turn off pixel
chushengyuan 0:2885d4453e88 843 clearPixel(x,y);
chushengyuan 0:2885d4453e88 844 else
chushengyuan 0:2885d4453e88 845 setPixel(x,y); // else if 'black' or 'dotted' turn on pixel
chushengyuan 0:2885d4453e88 846
chushengyuan 0:2885d4453e88 847 }
chushengyuan 0:2885d4453e88 848 }
chushengyuan 0:2885d4453e88 849
chushengyuan 0:2885d4453e88 850 }
chushengyuan 0:2885d4453e88 851
chushengyuan 0:2885d4453e88 852 MMA8452:: MMA8452(PinName sdaPin, PinName sclPin)
chushengyuan 0:2885d4453e88 853 {
chushengyuan 0:2885d4453e88 854 i2c = new I2C(sdaPin,sclPin); // create new I2C instance and initialise
chushengyuan 0:2885d4453e88 855 i2c->frequency(400000); // I2C Fast Mode - 400kHz
chushengyuan 0:2885d4453e88 856 leds = new BusOut(LED4,LED3,LED2,LED1); // for debug
chushengyuan 0:2885d4453e88 857 }
chushengyuan 0:2885d4453e88 858
chushengyuan 0:2885d4453e88 859 void MMA8452::init()
chushengyuan 0:2885d4453e88 860 {
chushengyuan 0:2885d4453e88 861
chushengyuan 0:2885d4453e88 862 i2c->frequency(400000); // set Fast Mode I2C frequency (5.10 datasheet)
chushengyuan 0:2885d4453e88 863
chushengyuan 0:2885d4453e88 864 char data = readByteFromRegister(WHO_AM_I); // p18 datasheet
chushengyuan 0:2885d4453e88 865 if (data != 0x2A) { // if correct ID not found, hand and flash error message
chushengyuan 0:2885d4453e88 866 error();
chushengyuan 0:2885d4453e88 867 }
chushengyuan 0:2885d4453e88 868
chushengyuan 0:2885d4453e88 869 // put into STANDBY while configuring
chushengyuan 0:2885d4453e88 870 data = readByteFromRegister(CTRL_REG1); // get current value of register
chushengyuan 0:2885d4453e88 871 data &= ~(1<<0); // clear bit 0 (p37 datasheet)
chushengyuan 0:2885d4453e88 872 sendByteToRegister(data,CTRL_REG1);
chushengyuan 0:2885d4453e88 873
chushengyuan 0:2885d4453e88 874 // Set output data rate, default is 800 Hz, will set to 100 Hz (clear b5, set b4/b3 - p37 datasheet)
chushengyuan 0:2885d4453e88 875 data = readByteFromRegister(CTRL_REG1);
chushengyuan 0:2885d4453e88 876 data &= ~(1<<5);
chushengyuan 0:2885d4453e88 877 data |= (1<<4);
chushengyuan 0:2885d4453e88 878 data |= (1<<3);
chushengyuan 0:2885d4453e88 879 sendByteToRegister(data,CTRL_REG1);
chushengyuan 0:2885d4453e88 880
chushengyuan 0:2885d4453e88 881 //// Can also change default 2g range to 4g or 8g (p22 datasheet)
chushengyuan 0:2885d4453e88 882 data = readByteFromRegister(XYZ_DATA_CFG);
chushengyuan 0:2885d4453e88 883 data |= (1<<0); // set bit 0 - 4g range
chushengyuan 0:2885d4453e88 884 sendByteToRegister(data,XYZ_DATA_CFG);
chushengyuan 0:2885d4453e88 885
chushengyuan 0:2885d4453e88 886 // set ACTIVE
chushengyuan 0:2885d4453e88 887 data = readByteFromRegister(CTRL_REG1);
chushengyuan 0:2885d4453e88 888 data |= (1<<0); // set bit 0 in CTRL_REG1
chushengyuan 0:2885d4453e88 889 sendByteToRegister(data,CTRL_REG1);
chushengyuan 0:2885d4453e88 890
chushengyuan 0:2885d4453e88 891 }
chushengyuan 0:2885d4453e88 892
chushengyuan 0:2885d4453e88 893 // read acceleration data from device
chushengyuan 0:2885d4453e88 894 Acceleration MMA8452::readValues()
chushengyuan 0:2885d4453e88 895 {
chushengyuan 0:2885d4453e88 896 // acceleration data stored in 6 registers (0x01 to 0x06)
chushengyuan 0:2885d4453e88 897 // device automatically increments register, so can read 6 bytes starting from OUT_X_MSB
chushengyuan 0:2885d4453e88 898 char data[6];
chushengyuan 0:2885d4453e88 899 readBytesFromRegister(OUT_X_MSB,6,data);
chushengyuan 0:2885d4453e88 900
chushengyuan 0:2885d4453e88 901 char x_MSB = data[0]; // extract MSB and LSBs for x,y,z values
chushengyuan 0:2885d4453e88 902 char x_LSB = data[1];
chushengyuan 0:2885d4453e88 903 char y_MSB = data[2];
chushengyuan 0:2885d4453e88 904 char y_LSB = data[3];
chushengyuan 0:2885d4453e88 905 char z_MSB = data[4];
chushengyuan 0:2885d4453e88 906 char z_LSB = data[5];
chushengyuan 0:2885d4453e88 907
chushengyuan 0:2885d4453e88 908 // [0:7] of MSB are 8 MSB of 12-bit value , [7:4] of LSB are 4 LSB's of 12-bit value
chushengyuan 0:2885d4453e88 909 // need to type-cast as numbers are in signed (2's complement) form (p20 datasheet)
chushengyuan 0:2885d4453e88 910 int x = (int16_t) (x_MSB << 8) | x_LSB; // combine bytes
chushengyuan 0:2885d4453e88 911 x >>= 4; // are left-aligned, so shift 4 places right to right-align
chushengyuan 0:2885d4453e88 912 int y = (int16_t) (y_MSB << 8) | y_LSB;
chushengyuan 0:2885d4453e88 913 y >>= 4;
chushengyuan 0:2885d4453e88 914 int z = (int16_t) (z_MSB << 8) | z_LSB;
chushengyuan 0:2885d4453e88 915 z >>= 4;
chushengyuan 0:2885d4453e88 916
chushengyuan 0:2885d4453e88 917 // sensitivity is 1024 counts/g in 2g mode (pg 9 datasheet)
chushengyuan 0:2885d4453e88 918 // " " 512 " 4g "
chushengyuan 0:2885d4453e88 919 // " " 256 " 8g "
chushengyuan 0:2885d4453e88 920 Acceleration acc;
chushengyuan 0:2885d4453e88 921
chushengyuan 0:2885d4453e88 922 acc.x = x/512.0;
chushengyuan 0:2885d4453e88 923 acc.y = y/512.0;
chushengyuan 0:2885d4453e88 924 acc.z = z/512.0;
chushengyuan 0:2885d4453e88 925
chushengyuan 0:2885d4453e88 926 return acc;
chushengyuan 0:2885d4453e88 927 }
chushengyuan 0:2885d4453e88 928
chushengyuan 0:2885d4453e88 929 // reads a byte from a specific register
chushengyuan 0:2885d4453e88 930 char MMA8452::readByteFromRegister(char reg)
chushengyuan 0:2885d4453e88 931 {
chushengyuan 0:2885d4453e88 932 int nack = i2c->write(MMA8452_W_ADDRESS,&reg,1,true); // send the register address to the slave
chushengyuan 0:2885d4453e88 933 // true as need to send repeated start condition (5.10.1 datasheet)
chushengyuan 0:2885d4453e88 934 // http://www.i2c-bus.org/repeated-start-condition/
chushengyuan 0:2885d4453e88 935 if (nack)
chushengyuan 0:2885d4453e88 936 error(); // if we don't receive acknowledgement, flash error message
chushengyuan 0:2885d4453e88 937
chushengyuan 0:2885d4453e88 938 char rx;
chushengyuan 0:2885d4453e88 939 nack = i2c->read(MMA8452_R_ADDRESS,&rx,1); // read a byte from the register and store in buffer
chushengyuan 0:2885d4453e88 940 if (nack)
chushengyuan 0:2885d4453e88 941 error(); // if we don't receive acknowledgement, flash error message
chushengyuan 0:2885d4453e88 942
chushengyuan 0:2885d4453e88 943 return rx;
chushengyuan 0:2885d4453e88 944 }
chushengyuan 0:2885d4453e88 945
chushengyuan 0:2885d4453e88 946 // reads a series of bytes, starting from a specific register
chushengyuan 0:2885d4453e88 947 void MMA8452::readBytesFromRegister(char reg,int numberOfBytes,char bytes[])
chushengyuan 0:2885d4453e88 948 {
chushengyuan 0:2885d4453e88 949
chushengyuan 0:2885d4453e88 950 int nack = i2c->write(MMA8452_W_ADDRESS,&reg,1,true); // send the slave write address and the configuration register address
chushengyuan 0:2885d4453e88 951 // true as need to send repeated start condition (5.10.1 datasheet)
chushengyuan 0:2885d4453e88 952 // http://www.i2c-bus.org/repeated-start-condition/
chushengyuan 0:2885d4453e88 953
chushengyuan 0:2885d4453e88 954 if (nack)
chushengyuan 0:2885d4453e88 955 error(); // if we don't receive acknowledgement, flash error message
chushengyuan 0:2885d4453e88 956
chushengyuan 0:2885d4453e88 957 nack = i2c->read(MMA8452_R_ADDRESS,bytes,numberOfBytes); // read bytes
chushengyuan 0:2885d4453e88 958 if (nack)
chushengyuan 0:2885d4453e88 959 error(); // if we don't receive acknowledgement, flash error message
chushengyuan 0:2885d4453e88 960
chushengyuan 0:2885d4453e88 961 }
chushengyuan 0:2885d4453e88 962
chushengyuan 0:2885d4453e88 963 // sends a byte to a specific register
chushengyuan 0:2885d4453e88 964 void MMA8452::sendByteToRegister(char byte,char reg)
chushengyuan 0:2885d4453e88 965 {
chushengyuan 0:2885d4453e88 966 char data[2];
chushengyuan 0:2885d4453e88 967 data[0] = reg;
chushengyuan 0:2885d4453e88 968 data[1] = byte;
chushengyuan 0:2885d4453e88 969 // send the register address, followed by the data
chushengyuan 0:2885d4453e88 970 int nack = i2c->write(MMA8452_W_ADDRESS,data,2);
chushengyuan 0:2885d4453e88 971 if (nack)
chushengyuan 0:2885d4453e88 972 error(); // if we don't receive acknowledgement, flash error message
chushengyuan 0:2885d4453e88 973
chushengyuan 0:2885d4453e88 974 }
chushengyuan 0:2885d4453e88 975
chushengyuan 0:2885d4453e88 976 void MMA8452::error()
chushengyuan 0:2885d4453e88 977 {
chushengyuan 0:2885d4453e88 978 while(1) {
chushengyuan 0:2885d4453e88 979 leds->write(15);
chushengyuan 0:2885d4453e88 980 wait(0.1);
chushengyuan 0:2885d4453e88 981 leds->write(0);
chushengyuan 0:2885d4453e88 982 wait(0.1);
chushengyuan 0:2885d4453e88 983 }
chushengyuan 0:2885d4453e88 984 }
chushengyuan 0:2885d4453e88 985
chushengyuan 0:2885d4453e88 986
chushengyuan 0:2885d4453e88 987
chushengyuan 0:2885d4453e88 988