Yizhi Sun / Mbed 2 deprecated Temperature

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Dependencies:   mbed

main.cpp@0:a5f38f79c701, 2015-05-10 (annotated)

Committer:
oscarsun
Date:
Sun May 10 21:46:51 2015 +0000
Revision:
0:a5f38f79c701
Weather Station for temperature measuring

Who changed what in which revision?

UserRevisionLine numberNew contents of line
oscarsun 0:a5f38f79c701 1 /**
oscarsun 0:a5f38f79c701 2 Project D-Weather Station
oscarsun 0:a5f38f79c701 3 Temperature measuring meter
oscarsun 0:a5f38f79c701 4 @file main.cpp
oscarsun 0:a5f38f79c701 5 @brief headfile contain the functions prototypys,defines and global variable
oscarsun 0:a5f38f79c701 6 @author Sun Yizhi
oscarsun 0:a5f38f79c701 7 @date May 2015
oscarsun 0:a5f38f79c701 8 */
oscarsun 0:a5f38f79c701 9 #include "mbed.h"
oscarsun 0:a5f38f79c701 10 #include "BMP180.h"
oscarsun 0:a5f38f79c701 11 #include "N5110.h"
oscarsun 0:a5f38f79c701 12
oscarsun 0:a5f38f79c701 13 /**
oscarsun 0:a5f38f79c701 14 @namespace lcd
oscarsun 0:a5f38f79c701 15 @brief initialize the lcd display
oscarsun 0:a5f38f79c701 16 @namespace leds
oscarsun 0:a5f38f79c701 17 @brief GPIO led for the green led
oscarsun 0:a5f38f79c701 18 @namespace button
oscarsun 0:a5f38f79c701 19 @brief use the ISR for the button
oscarsun 0:a5f38f79c701 20 */
oscarsun 0:a5f38f79c701 21
oscarsun 0:a5f38f79c701 22
oscarsun 0:a5f38f79c701 23 // LCD control
oscarsun 0:a5f38f79c701 24 N5110::N5110(PinName pwrPin, PinName scePin, PinName rstPin, PinName dcPin, PinName mosiPin, PinName sclkPin, PinName ledPin)
oscarsun 0:a5f38f79c701 25 {
oscarsun 0:a5f38f79c701 26
oscarsun 0:a5f38f79c701 27 spi = new SPI(mosiPin,NC,sclkPin); // create new SPI instance and initialise
oscarsun 0:a5f38f79c701 28 initSPI();
oscarsun 0:a5f38f79c701 29
oscarsun 0:a5f38f79c701 30 // set up pins as required
oscarsun 0:a5f38f79c701 31 led = new PwmOut(ledPin);
oscarsun 0:a5f38f79c701 32 pwr = new DigitalOut(pwrPin);
oscarsun 0:a5f38f79c701 33 sce = new DigitalOut(scePin);
oscarsun 0:a5f38f79c701 34 rst = new DigitalOut(rstPin);
oscarsun 0:a5f38f79c701 35 dc = new DigitalOut(dcPin);
oscarsun 0:a5f38f79c701 36
oscarsun 0:a5f38f79c701 37 }
oscarsun 0:a5f38f79c701 38
oscarsun 0:a5f38f79c701 39 // initialise function - powers up and sends the initialisation commands
oscarsun 0:a5f38f79c701 40 void N5110::init()
oscarsun 0:a5f38f79c701 41 {
oscarsun 0:a5f38f79c701 42 turnOn(); // power up
oscarsun 0:a5f38f79c701 43 wait_ms(10); // small delay seems to prevent spurious pixels during mbed reset
oscarsun 0:a5f38f79c701 44 reset(); // reset LCD - must be done within 100 ms
oscarsun 0:a5f38f79c701 45
oscarsun 0:a5f38f79c701 46 // function set - extended
oscarsun 0:a5f38f79c701 47 sendCommand(0x20 | CMD_FS_ACTIVE_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_EXTENDED_MODE);
oscarsun 0:a5f38f79c701 48 // Don't completely understand these parameters - they seem to work as they are
oscarsun 0:a5f38f79c701 49 // Consult the datasheet if you need to change them
oscarsun 0:a5f38f79c701 50 sendCommand(CMD_VOP_7V38); // operating voltage - these values are from Chris Yan's Library
oscarsun 0:a5f38f79c701 51 sendCommand(CMD_TC_TEMP_2); // temperature control
oscarsun 0:a5f38f79c701 52 sendCommand(CMD_BI_MUX_48); // bias
oscarsun 0:a5f38f79c701 53
oscarsun 0:a5f38f79c701 54 // function set - basic
oscarsun 0:a5f38f79c701 55 sendCommand(0x20 | CMD_FS_ACTIVE_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_BASIC_MODE);
oscarsun 0:a5f38f79c701 56 normalMode(); // normal video mode by default
oscarsun 0:a5f38f79c701 57 sendCommand(CMD_DC_NORMAL_MODE); // black on white
oscarsun 0:a5f38f79c701 58
oscarsun 0:a5f38f79c701 59 // RAM is undefined at power-up so clear
oscarsun 0:a5f38f79c701 60 clearRAM();
oscarsun 0:a5f38f79c701 61
oscarsun 0:a5f38f79c701 62 }
oscarsun 0:a5f38f79c701 63
oscarsun 0:a5f38f79c701 64 // sets normal video mode (black on white)
oscarsun 0:a5f38f79c701 65 void N5110::normalMode()
oscarsun 0:a5f38f79c701 66 {
oscarsun 0:a5f38f79c701 67 sendCommand(CMD_DC_NORMAL_MODE);
oscarsun 0:a5f38f79c701 68
oscarsun 0:a5f38f79c701 69 }
oscarsun 0:a5f38f79c701 70
oscarsun 0:a5f38f79c701 71 // sets normal video mode (white on black)
oscarsun 0:a5f38f79c701 72 void N5110::inverseMode()
oscarsun 0:a5f38f79c701 73 {
oscarsun 0:a5f38f79c701 74 sendCommand(CMD_DC_INVERT_VIDEO);
oscarsun 0:a5f38f79c701 75 }
oscarsun 0:a5f38f79c701 76
oscarsun 0:a5f38f79c701 77 // function to power up the LCD and backlight
oscarsun 0:a5f38f79c701 78 void N5110::turnOn()
oscarsun 0:a5f38f79c701 79 {
oscarsun 0:a5f38f79c701 80 // set brightness of LED - 0.0 to 1.0 - default is 50%
oscarsun 0:a5f38f79c701 81 setBrightness(0.5);
oscarsun 0:a5f38f79c701 82 pwr->write(1); // apply power
oscarsun 0:a5f38f79c701 83 }
oscarsun 0:a5f38f79c701 84
oscarsun 0:a5f38f79c701 85 // function to power down LCD
oscarsun 0:a5f38f79c701 86 void N5110::turnOff()
oscarsun 0:a5f38f79c701 87 {
oscarsun 0:a5f38f79c701 88 setBrightness(0.0); // turn backlight off
oscarsun 0:a5f38f79c701 89 clearRAM(); // clear RAM to ensure specified current consumption
oscarsun 0:a5f38f79c701 90 // send command to ensure we are in basic mode
oscarsun 0:a5f38f79c701 91 sendCommand(0x20 | CMD_FS_ACTIVE_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_BASIC_MODE);
oscarsun 0:a5f38f79c701 92 // clear the display
oscarsun 0:a5f38f79c701 93 sendCommand(CMD_DC_CLEAR_DISPLAY);
oscarsun 0:a5f38f79c701 94 // enter the extended mode and power down
oscarsun 0:a5f38f79c701 95 sendCommand(0x20 | CMD_FS_POWER_DOWN_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_EXTENDED_MODE);
oscarsun 0:a5f38f79c701 96 // small delay and then turn off the power pin
oscarsun 0:a5f38f79c701 97 wait_ms(10);
oscarsun 0:a5f38f79c701 98 pwr->write(0);
oscarsun 0:a5f38f79c701 99
oscarsun 0:a5f38f79c701 100 }
oscarsun 0:a5f38f79c701 101
oscarsun 0:a5f38f79c701 102 // function to change LED backlight brightness
oscarsun 0:a5f38f79c701 103 void N5110::setBrightness(float brightness)
oscarsun 0:a5f38f79c701 104 {
oscarsun 0:a5f38f79c701 105 // check whether brightness is within range
oscarsun 0:a5f38f79c701 106 if (brightness < 0.0)
oscarsun 0:a5f38f79c701 107 brightness = 0.0;
oscarsun 0:a5f38f79c701 108 if (brightness > 1.0)
oscarsun 0:a5f38f79c701 109 brightness = 1.0;
oscarsun 0:a5f38f79c701 110 // set PWM duty cycle
oscarsun 0:a5f38f79c701 111 led->write(brightness);
oscarsun 0:a5f38f79c701 112 }
oscarsun 0:a5f38f79c701 113
oscarsun 0:a5f38f79c701 114
oscarsun 0:a5f38f79c701 115 // pulse the active low reset line
oscarsun 0:a5f38f79c701 116 void N5110::reset()
oscarsun 0:a5f38f79c701 117 {
oscarsun 0:a5f38f79c701 118 rst->write(0); // reset the LCD
oscarsun 0:a5f38f79c701 119 rst->write(1);
oscarsun 0:a5f38f79c701 120 }
oscarsun 0:a5f38f79c701 121
oscarsun 0:a5f38f79c701 122 // function to initialise SPI peripheral
oscarsun 0:a5f38f79c701 123 void N5110::initSPI()
oscarsun 0:a5f38f79c701 124 {
oscarsun 0:a5f38f79c701 125 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
oscarsun 0:a5f38f79c701 126 spi->frequency(4000000); // maximum of screen is 4 MHz
oscarsun 0:a5f38f79c701 127 }
oscarsun 0:a5f38f79c701 128
oscarsun 0:a5f38f79c701 129 // send a command to the display
oscarsun 0:a5f38f79c701 130 void N5110::sendCommand(unsigned char command)
oscarsun 0:a5f38f79c701 131 {
oscarsun 0:a5f38f79c701 132 dc->write(0); // set DC low for command
oscarsun 0:a5f38f79c701 133 sce->write(0); // set CE low to begin frame
oscarsun 0:a5f38f79c701 134 spi->write(command); // send command
oscarsun 0:a5f38f79c701 135 dc->write(1); // turn back to data by default
oscarsun 0:a5f38f79c701 136 sce->write(1); // set CE high to end frame (expected for transmission of single byte)
oscarsun 0:a5f38f79c701 137
oscarsun 0:a5f38f79c701 138 }
oscarsun 0:a5f38f79c701 139
oscarsun 0:a5f38f79c701 140 // send data to the display at the current XY address
oscarsun 0:a5f38f79c701 141 // dc is set to 1 (i.e. data) after sending a command and so should
oscarsun 0:a5f38f79c701 142 // be the default mode.
oscarsun 0:a5f38f79c701 143 void N5110::sendData(unsigned char data)
oscarsun 0:a5f38f79c701 144 {
oscarsun 0:a5f38f79c701 145 sce->write(0); // set CE low to begin frame
oscarsun 0:a5f38f79c701 146 spi->write(data);
oscarsun 0:a5f38f79c701 147 sce->write(1); // set CE high to end frame (expected for transmission of single byte)
oscarsun 0:a5f38f79c701 148 }
oscarsun 0:a5f38f79c701 149
oscarsun 0:a5f38f79c701 150 // this function writes 0 to the 504 bytes to clear the RAM
oscarsun 0:a5f38f79c701 151 void N5110::clearRAM()
oscarsun 0:a5f38f79c701 152 {
oscarsun 0:a5f38f79c701 153 int i;
oscarsun 0:a5f38f79c701 154 sce->write(0); //set CE low to begin frame
oscarsun 0:a5f38f79c701 155 for(i = 0; i < WIDTH * HEIGHT; i++) { // 48 x 84 bits = 504 bytes
oscarsun 0:a5f38f79c701 156 spi->write(0x00); // send 0's
oscarsun 0:a5f38f79c701 157 }
oscarsun 0:a5f38f79c701 158 sce->write(1); // set CE high to end frame
oscarsun 0:a5f38f79c701 159
oscarsun 0:a5f38f79c701 160 }
oscarsun 0:a5f38f79c701 161
oscarsun 0:a5f38f79c701 162 // function to set the XY address in RAM for subsequenct data write
oscarsun 0:a5f38f79c701 163 void N5110::setXYAddress(int x, int y)
oscarsun 0:a5f38f79c701 164 {
oscarsun 0:a5f38f79c701 165 if (x>=0 && x<WIDTH && y>=0 && y<HEIGHT) { // check within range
oscarsun 0:a5f38f79c701 166 sendCommand(0x80 | x); // send addresses to display with relevant mask
oscarsun 0:a5f38f79c701 167 sendCommand(0x40 | y);
oscarsun 0:a5f38f79c701 168 }
oscarsun 0:a5f38f79c701 169 }
oscarsun 0:a5f38f79c701 170
oscarsun 0:a5f38f79c701 171 // These functions are used to set, clear and get the value of pixels in the display
oscarsun 0:a5f38f79c701 172 // Pixels are addressed in the range of 0 to 47 (y) and 0 to 83 (x). The refresh()
oscarsun 0:a5f38f79c701 173 // function must be called after set and clear in order to update the display
oscarsun 0:a5f38f79c701 174 void N5110::setPixel(int x, int y)
oscarsun 0:a5f38f79c701 175 {
oscarsun 0:a5f38f79c701 176 if (x>=0 && x<WIDTH && y>=0 && y<HEIGHT) { // check within range
oscarsun 0:a5f38f79c701 177 // calculate bank and shift 1 to required position in the data byte
oscarsun 0:a5f38f79c701 178 buffer[x][y/8] |= (1 << y%8);
oscarsun 0:a5f38f79c701 179 }
oscarsun 0:a5f38f79c701 180 }
oscarsun 0:a5f38f79c701 181
oscarsun 0:a5f38f79c701 182 void N5110::clearPixel(int x, int y)
oscarsun 0:a5f38f79c701 183 {
oscarsun 0:a5f38f79c701 184 if (x>=0 && x<WIDTH && y>=0 && y<HEIGHT) { // check within range
oscarsun 0:a5f38f79c701 185 // calculate bank and shift 1 to required position (using bit clear)
oscarsun 0:a5f38f79c701 186 buffer[x][y/8] &= ~(1 << y%8);
oscarsun 0:a5f38f79c701 187 }
oscarsun 0:a5f38f79c701 188 }
oscarsun 0:a5f38f79c701 189
oscarsun 0:a5f38f79c701 190 int N5110::getPixel(int x, int y)
oscarsun 0:a5f38f79c701 191 {
oscarsun 0:a5f38f79c701 192 if (x>=0 && x<WIDTH && y>=0 && y<HEIGHT) { // check within range
oscarsun 0:a5f38f79c701 193 // return relevant bank and mask required bit
oscarsun 0:a5f38f79c701 194 return (int) buffer[x][y/8] & (1 << y%8);
oscarsun 0:a5f38f79c701 195 } else {
oscarsun 0:a5f38f79c701 196 return 0;
oscarsun 0:a5f38f79c701 197 }
oscarsun 0:a5f38f79c701 198 }
oscarsun 0:a5f38f79c701 199
oscarsun 0:a5f38f79c701 200 // function to refresh the display
oscarsun 0:a5f38f79c701 201 void N5110::refresh()
oscarsun 0:a5f38f79c701 202 {
oscarsun 0:a5f38f79c701 203 int i,j;
oscarsun 0:a5f38f79c701 204
oscarsun 0:a5f38f79c701 205 setXYAddress(0,0); // important to set address back to 0,0 before refreshing display
oscarsun 0:a5f38f79c701 206 // address auto increments after printing string, so buffer[0][0] will not coincide
oscarsun 0:a5f38f79c701 207 // with top-left pixel after priting string
oscarsun 0:a5f38f79c701 208
oscarsun 0:a5f38f79c701 209 sce->write(0); //set CE low to begin frame
oscarsun 0:a5f38f79c701 210
oscarsun 0:a5f38f79c701 211 for(j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
oscarsun 0:a5f38f79c701 212 for(i = 0; i < WIDTH; i++) {
oscarsun 0:a5f38f79c701 213 spi->write(buffer[i][j]); // send buffer
oscarsun 0:a5f38f79c701 214 }
oscarsun 0:a5f38f79c701 215 }
oscarsun 0:a5f38f79c701 216 sce->write(1); // set CE high to end frame
oscarsun 0:a5f38f79c701 217
oscarsun 0:a5f38f79c701 218 }
oscarsun 0:a5f38f79c701 219
oscarsun 0:a5f38f79c701 220 // fills the buffer with random bytes. Can be used to test the display.
oscarsun 0:a5f38f79c701 221 // The rand() function isn't seeded so it probably creates the same pattern everytime
oscarsun 0:a5f38f79c701 222 void N5110::randomiseBuffer()
oscarsun 0:a5f38f79c701 223 {
oscarsun 0:a5f38f79c701 224 int i,j;
oscarsun 0:a5f38f79c701 225 for(j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
oscarsun 0:a5f38f79c701 226 for(i = 0; i < WIDTH; i++) {
oscarsun 0:a5f38f79c701 227 buffer[i][j] = rand()%256; // generate random byte
oscarsun 0:a5f38f79c701 228 }
oscarsun 0:a5f38f79c701 229 }
oscarsun 0:a5f38f79c701 230
oscarsun 0:a5f38f79c701 231 }
oscarsun 0:a5f38f79c701 232
oscarsun 0:a5f38f79c701 233 // function to print 5x7 font
oscarsun 0:a5f38f79c701 234 void N5110::printChar(char c,int x,int y)
oscarsun 0:a5f38f79c701 235 {
oscarsun 0:a5f38f79c701 236 if (y>=0 && y<6) { // check if printing in range of y banks
oscarsun 0:a5f38f79c701 237
oscarsun 0:a5f38f79c701 238 for (int i = 0; i < 5 ; i++ ) {
oscarsun 0:a5f38f79c701 239 int pixel_x = x+i;
oscarsun 0:a5f38f79c701 240 if (pixel_x > 83) // ensure pixel isn't outside the buffer size (0 - 83)
oscarsun 0:a5f38f79c701 241 break;
oscarsun 0:a5f38f79c701 242 buffer[pixel_x][y] = font5x7[(c - 32)*5 + i];
oscarsun 0:a5f38f79c701 243 // array is offset by 32 relative to ASCII, each character is 5 pixels wide
oscarsun 0:a5f38f79c701 244 }
oscarsun 0:a5f38f79c701 245
oscarsun 0:a5f38f79c701 246 refresh(); // this sends the buffer to the display and sets address (cursor) back to 0,0
oscarsun 0:a5f38f79c701 247 }
oscarsun 0:a5f38f79c701 248 }
oscarsun 0:a5f38f79c701 249
oscarsun 0:a5f38f79c701 250 // function to print string at specified position
oscarsun 0:a5f38f79c701 251 void N5110::printString(const char * str,int x,int y)
oscarsun 0:a5f38f79c701 252 {
oscarsun 0:a5f38f79c701 253 if (y>=0 && y<6) { // check if printing in range of y banks
oscarsun 0:a5f38f79c701 254
oscarsun 0:a5f38f79c701 255 int n = 0 ; // counter for number of characters in string
oscarsun 0:a5f38f79c701 256 // loop through string and print character
oscarsun 0:a5f38f79c701 257 while(*str) {
oscarsun 0:a5f38f79c701 258
oscarsun 0:a5f38f79c701 259 // writes the character bitmap data to the buffer, so that
oscarsun 0:a5f38f79c701 260 // text and pixels can be displayed at the same time
oscarsun 0:a5f38f79c701 261 for (int i = 0; i < 5 ; i++ ) {
oscarsun 0:a5f38f79c701 262 int pixel_x = x+i+n*6;
oscarsun 0:a5f38f79c701 263 if (pixel_x > 83) // ensure pixel isn't outside the buffer size (0 - 83)
oscarsun 0:a5f38f79c701 264 break;
oscarsun 0:a5f38f79c701 265 buffer[pixel_x][y] = font5x7[(*str - 32)*5 + i];
oscarsun 0:a5f38f79c701 266 }
oscarsun 0:a5f38f79c701 267
oscarsun 0:a5f38f79c701 268 str++; // go to next character in string
oscarsun 0:a5f38f79c701 269
oscarsun 0:a5f38f79c701 270 n++; // increment index
oscarsun 0:a5f38f79c701 271
oscarsun 0:a5f38f79c701 272 }
oscarsun 0:a5f38f79c701 273
oscarsun 0:a5f38f79c701 274 refresh(); // this sends the buffer to the display and sets address (cursor) back to 0,0
oscarsun 0:a5f38f79c701 275 }
oscarsun 0:a5f38f79c701 276 }
oscarsun 0:a5f38f79c701 277
oscarsun 0:a5f38f79c701 278 // function to clear the screen
oscarsun 0:a5f38f79c701 279 void N5110::clear()
oscarsun 0:a5f38f79c701 280 {
oscarsun 0:a5f38f79c701 281 clearBuffer(); // clear the buffer then call the refresh function
oscarsun 0:a5f38f79c701 282 refresh();
oscarsun 0:a5f38f79c701 283 }
oscarsun 0:a5f38f79c701 284
oscarsun 0:a5f38f79c701 285 // function to clear the buffer
oscarsun 0:a5f38f79c701 286 void N5110::clearBuffer()
oscarsun 0:a5f38f79c701 287 {
oscarsun 0:a5f38f79c701 288 int i,j;
oscarsun 0:a5f38f79c701 289 for (i=0; i<WIDTH; i++) { // loop through the banks and set the buffer to 0
oscarsun 0:a5f38f79c701 290 for (j=0; j<BANKS; j++) {
oscarsun 0:a5f38f79c701 291 buffer[i][j]=0;
oscarsun 0:a5f38f79c701 292 }
oscarsun 0:a5f38f79c701 293 }
oscarsun 0:a5f38f79c701 294 }
oscarsun 0:a5f38f79c701 295
oscarsun 0:a5f38f79c701 296 // function to plot array on display
oscarsun 0:a5f38f79c701 297 void N5110::plotArray(float array[])
oscarsun 0:a5f38f79c701 298 {
oscarsun 0:a5f38f79c701 299
oscarsun 0:a5f38f79c701 300 int i;
oscarsun 0:a5f38f79c701 301
oscarsun 0:a5f38f79c701 302 for (i=0; i<WIDTH; i++) { // loop through array
oscarsun 0:a5f38f79c701 303 // elements are normalised from 0.0 to 1.0, so multiply
oscarsun 0:a5f38f79c701 304 // by 47 to convert to pixel range, and subtract from 47
oscarsun 0:a5f38f79c701 305 // since top-left is 0,0 in the display geometry
oscarsun 0:a5f38f79c701 306 setPixel(i,47 - int(array[i]*47.0));
oscarsun 0:a5f38f79c701 307 }
oscarsun 0:a5f38f79c701 308
oscarsun 0:a5f38f79c701 309 refresh();
oscarsun 0:a5f38f79c701 310
oscarsun 0:a5f38f79c701 311 }
oscarsun 0:a5f38f79c701 312
oscarsun 0:a5f38f79c701 313 // function to draw circle
oscarsun 0:a5f38f79c701 314 void N5110:: drawCircle(int x0,int y0,int radius,int fill)
oscarsun 0:a5f38f79c701 315 {
oscarsun 0:a5f38f79c701 316 // from http://en.wikipedia.org/wiki/Midpoint_circle_algorithm
oscarsun 0:a5f38f79c701 317 int x = radius;
oscarsun 0:a5f38f79c701 318 int y = 0;
oscarsun 0:a5f38f79c701 319 int radiusError = 1-x;
oscarsun 0:a5f38f79c701 320
oscarsun 0:a5f38f79c701 321 while(x >= y) {
oscarsun 0:a5f38f79c701 322
oscarsun 0:a5f38f79c701 323 // if transparent, just draw outline
oscarsun 0:a5f38f79c701 324 if (fill == 0) {
oscarsun 0:a5f38f79c701 325 setPixel( x + x0, y + y0);
oscarsun 0:a5f38f79c701 326 setPixel(-x + x0, y + y0);
oscarsun 0:a5f38f79c701 327 setPixel( y + x0, x + y0);
oscarsun 0:a5f38f79c701 328 setPixel(-y + x0, x + y0);
oscarsun 0:a5f38f79c701 329 setPixel(-y + x0, -x + y0);
oscarsun 0:a5f38f79c701 330 setPixel( y + x0, -x + y0);
oscarsun 0:a5f38f79c701 331 setPixel( x + x0, -y + y0);
oscarsun 0:a5f38f79c701 332 setPixel(-x + x0, -y + y0);
oscarsun 0:a5f38f79c701 333 } else { // drawing filled circle, so draw lines between points at same y value
oscarsun 0:a5f38f79c701 334
oscarsun 0:a5f38f79c701 335 int type = (fill==1) ? 1:0; // black or white fill
oscarsun 0:a5f38f79c701 336
oscarsun 0:a5f38f79c701 337 drawLine(x+x0,y+y0,-x+x0,y+y0,type);
oscarsun 0:a5f38f79c701 338 drawLine(y+x0,x+y0,-y+x0,x+y0,type);
oscarsun 0:a5f38f79c701 339 drawLine(y+x0,-x+y0,-y+x0,-x+y0,type);
oscarsun 0:a5f38f79c701 340 drawLine(x+x0,-y+y0,-x+x0,-y+y0,type);
oscarsun 0:a5f38f79c701 341 }
oscarsun 0:a5f38f79c701 342
oscarsun 0:a5f38f79c701 343
oscarsun 0:a5f38f79c701 344 y++;
oscarsun 0:a5f38f79c701 345 if (radiusError<0) {
oscarsun 0:a5f38f79c701 346 radiusError += 2 * y + 1;
oscarsun 0:a5f38f79c701 347 } else {
oscarsun 0:a5f38f79c701 348 x--;
oscarsun 0:a5f38f79c701 349 radiusError += 2 * (y - x) + 1;
oscarsun 0:a5f38f79c701 350 }
oscarsun 0:a5f38f79c701 351 }
oscarsun 0:a5f38f79c701 352
oscarsun 0:a5f38f79c701 353 refresh();
oscarsun 0:a5f38f79c701 354 }
oscarsun 0:a5f38f79c701 355
oscarsun 0:a5f38f79c701 356 void N5110::drawLine(int x0,int y0,int x1,int y1,int type)
oscarsun 0:a5f38f79c701 357 {
oscarsun 0:a5f38f79c701 358 int y_range = y1-y0; // calc range of y and x
oscarsun 0:a5f38f79c701 359 int x_range = x1-x0;
oscarsun 0:a5f38f79c701 360 int start,stop,step;
oscarsun 0:a5f38f79c701 361
oscarsun 0:a5f38f79c701 362 // if dotted line, set step to 2, else step is 1
oscarsun 0:a5f38f79c701 363 step = (type==2) ? 2:1;
oscarsun 0:a5f38f79c701 364
oscarsun 0:a5f38f79c701 365 // make sure we loop over the largest range to get the most pixels on the display
oscarsun 0:a5f38f79c701 366 // for instance, if drawing a vertical line (x_range = 0), we need to loop down the y pixels
oscarsun 0:a5f38f79c701 367 // or else we'll only end up with 1 pixel in the x column
oscarsun 0:a5f38f79c701 368 if ( abs(x_range) > abs(y_range) ) {
oscarsun 0:a5f38f79c701 369
oscarsun 0:a5f38f79c701 370 // ensure we loop from smallest to largest or else for-loop won't run as expected
oscarsun 0:a5f38f79c701 371 start = x1>x0 ? x0:x1;
oscarsun 0:a5f38f79c701 372 stop = x1>x0 ? x1:x0;
oscarsun 0:a5f38f79c701 373
oscarsun 0:a5f38f79c701 374 // loop between x pixels
oscarsun 0:a5f38f79c701 375 for (int x = start; x<= stop ; x+=step) {
oscarsun 0:a5f38f79c701 376 // do linear interpolation
oscarsun 0:a5f38f79c701 377 int y = y0 + (y1-y0)*(x-x0)/(x1-x0);
oscarsun 0:a5f38f79c701 378
oscarsun 0:a5f38f79c701 379 if (type == 0) // if 'white' line, turn off pixel
oscarsun 0:a5f38f79c701 380 clearPixel(x,y);
oscarsun 0:a5f38f79c701 381 else
oscarsun 0:a5f38f79c701 382 setPixel(x,y); // else if 'black' or 'dotted' turn on pixel
oscarsun 0:a5f38f79c701 383 }
oscarsun 0:a5f38f79c701 384 } else {
oscarsun 0:a5f38f79c701 385
oscarsun 0:a5f38f79c701 386 // ensure we loop from smallest to largest or else for-loop won't run as expected
oscarsun 0:a5f38f79c701 387 start = y1>y0 ? y0:y1;
oscarsun 0:a5f38f79c701 388 stop = y1>y0 ? y1:y0;
oscarsun 0:a5f38f79c701 389
oscarsun 0:a5f38f79c701 390 for (int y = start; y<= stop ; y+=step) {
oscarsun 0:a5f38f79c701 391 // do linear interpolation
oscarsun 0:a5f38f79c701 392 int x = x0 + (x1-x0)*(y-y0)/(y1-y0);
oscarsun 0:a5f38f79c701 393
oscarsun 0:a5f38f79c701 394 if (type == 0) // if 'white' line, turn off pixel
oscarsun 0:a5f38f79c701 395 clearPixel(x,y);
oscarsun 0:a5f38f79c701 396 else
oscarsun 0:a5f38f79c701 397 setPixel(x,y); // else if 'black' or 'dotted' turn on pixel
oscarsun 0:a5f38f79c701 398
oscarsun 0:a5f38f79c701 399 }
oscarsun 0:a5f38f79c701 400 }
oscarsun 0:a5f38f79c701 401
oscarsun 0:a5f38f79c701 402 refresh();
oscarsun 0:a5f38f79c701 403 }
oscarsun 0:a5f38f79c701 404
oscarsun 0:a5f38f79c701 405 void N5110::drawRect(int x0,int y0,int width,int height,int fill)
oscarsun 0:a5f38f79c701 406 {
oscarsun 0:a5f38f79c701 407
oscarsun 0:a5f38f79c701 408 if (fill == 0) { // transparent, just outline
oscarsun 0:a5f38f79c701 409 drawLine(x0,y0,x0+width,y0,1); // top
oscarsun 0:a5f38f79c701 410 drawLine(x0,y0+height,x0+width,y0+height,1); // bottom
oscarsun 0:a5f38f79c701 411 drawLine(x0,y0,x0,y0+height,1); // left
oscarsun 0:a5f38f79c701 412 drawLine(x0+width,y0,x0+width,y0+height,1); // right
oscarsun 0:a5f38f79c701 413 } else { // filled rectangle
oscarsun 0:a5f38f79c701 414 int type = (fill==1) ? 1:0; // black or white fill
oscarsun 0:a5f38f79c701 415 for (int y = y0; y<= y0+height; y++) { // loop through rows of rectangle
oscarsun 0:a5f38f79c701 416 drawLine(x0,y,x0+width,y,type); // draw line across screen
oscarsun 0:a5f38f79c701 417 }
oscarsun 0:a5f38f79c701 418 }
oscarsun 0:a5f38f79c701 419
oscarsun 0:a5f38f79c701 420 }
oscarsun 0:a5f38f79c701 421 // Sensor control
oscarsun 0:a5f38f79c701 422 BMP180::BMP180(PinName sdaPin, PinName sclPin)
oscarsun 0:a5f38f79c701 423 {
oscarsun 0:a5f38f79c701 424 i2c = new I2C(sdaPin,sclPin); // create new I2C instance and initialise
oscarsun 0:a5f38f79c701 425 i2c->frequency(400000); // I2C Fast Mode - 400kHz
oscarsun 0:a5f38f79c701 426 leds = new BusOut(LED4,LED3,LED2,LED1);
oscarsun 0:a5f38f79c701 427 }
oscarsun 0:a5f38f79c701 428
oscarsun 0:a5f38f79c701 429 Measurement BMP180::readValues()
oscarsun 0:a5f38f79c701 430 {
oscarsun 0:a5f38f79c701 431 // algorithm for taking measurement is taken from datasheet
oscarsun 0:a5f38f79c701 432 int32_t UT = readUncompensatedTemperatureValue();
oscarsun 0:a5f38f79c701 433 int32_t UP = readUncompensatedPressureValue();
oscarsun 0:a5f38f79c701 434 // once you have the uncompensated T and P, you can calculate the true T and P
oscarsun 0:a5f38f79c701 435 // using the equations from the datasheet
oscarsun 0:a5f38f79c701 436 int32_t T = calcTrueTemperature(UT);
oscarsun 0:a5f38f79c701 437 int32_t P = calcTruePressure(UP);
oscarsun 0:a5f38f79c701 438
oscarsun 0:a5f38f79c701 439 Measurement measurement;
oscarsun 0:a5f38f79c701 440 measurement.temperature = T*0.1; // scaled by 0.1 C
oscarsun 0:a5f38f79c701 441 measurement.pressure = P*0.01; // Put pressure in mb
oscarsun 0:a5f38f79c701 442
oscarsun 0:a5f38f79c701 443 return measurement;
oscarsun 0:a5f38f79c701 444 }
oscarsun 0:a5f38f79c701 445
oscarsun 0:a5f38f79c701 446 int32_t BMP180::readUncompensatedTemperatureValue()
oscarsun 0:a5f38f79c701 447 {
oscarsun 0:a5f38f79c701 448 // from algorithm in datasheet - p15
oscarsun 0:a5f38f79c701 449 sendByteToRegister(0x2E,0xF4);
oscarsun 0:a5f38f79c701 450 wait_ms(5); // 4.5 ms delay for OSS = 1
oscarsun 0:a5f38f79c701 451 char MSB = readByteFromRegister(0xF6);
oscarsun 0:a5f38f79c701 452 char LSB = readByteFromRegister(0xF7);
oscarsun 0:a5f38f79c701 453 // combine in 16-bit value
oscarsun 0:a5f38f79c701 454 int UT = (MSB << 8) | LSB;
oscarsun 0:a5f38f79c701 455 #ifdef DEBUG
oscarsun 0:a5f38f79c701 456 UT = 27898; // test data from datasheet
oscarsun 0:a5f38f79c701 457 printf("****DEBUG MODE****\nUT = %d\n",UT);
oscarsun 0:a5f38f79c701 458 #endif
oscarsun 0:a5f38f79c701 459 return UT;
oscarsun 0:a5f38f79c701 460 }
oscarsun 0:a5f38f79c701 461
oscarsun 0:a5f38f79c701 462 int32_t BMP180::readUncompensatedPressureValue()
oscarsun 0:a5f38f79c701 463 {
oscarsun 0:a5f38f79c701 464 // from datasheet
oscarsun 0:a5f38f79c701 465 char byte = 0x34 + (oss << 6);
oscarsun 0:a5f38f79c701 466 sendByteToRegister(byte,0xF4);
oscarsun 0:a5f38f79c701 467 wait_ms(8); // 7.5 ms delay for OSS = 1
oscarsun 0:a5f38f79c701 468
oscarsun 0:a5f38f79c701 469 char MSB = readByteFromRegister(0xF6);
oscarsun 0:a5f38f79c701 470 char LSB = readByteFromRegister(0xF7);
oscarsun 0:a5f38f79c701 471 char XLSB = readByteFromRegister(0xF7);
oscarsun 0:a5f38f79c701 472 int UP = (MSB << 16 | LSB << 8 | XLSB) >> (8 - oss);
oscarsun 0:a5f38f79c701 473
oscarsun 0:a5f38f79c701 474 #ifdef DEBUG
oscarsun 0:a5f38f79c701 475 UP = 23843; // test data from datasheet
oscarsun 0:a5f38f79c701 476 printf("UP = %d\n",UP);
oscarsun 0:a5f38f79c701 477 #endif
oscarsun 0:a5f38f79c701 478 return UP;
oscarsun 0:a5f38f79c701 479 }
oscarsun 0:a5f38f79c701 480
oscarsun 0:a5f38f79c701 481 int32_t BMP180::calcTrueTemperature(int32_t UT)
oscarsun 0:a5f38f79c701 482 {
oscarsun 0:a5f38f79c701 483 // equations from data sheet
oscarsun 0:a5f38f79c701 484 X1 = ((UT - calibration.AC6)*calibration.AC5) >> 15;
oscarsun 0:a5f38f79c701 485 X2 = (calibration.MC << 11) / (X1 + calibration.MD);
oscarsun 0:a5f38f79c701 486 B5 = X1 + X2;
oscarsun 0:a5f38f79c701 487 int32_t T = (B5 + 8) >> 4;
oscarsun 0:a5f38f79c701 488 #ifdef DEBUG
oscarsun 0:a5f38f79c701 489 printf("****\nX1=%d\nX2=%d\nB5=%d\nT=%d\n",X1,X2,B5,T);
oscarsun 0:a5f38f79c701 490 #endif
oscarsun 0:a5f38f79c701 491 return T;
oscarsun 0:a5f38f79c701 492 }
oscarsun 0:a5f38f79c701 493
oscarsun 0:a5f38f79c701 494 int32_t BMP180::calcTruePressure(int32_t UP)
oscarsun 0:a5f38f79c701 495 {
oscarsun 0:a5f38f79c701 496 // equations from data sheet
oscarsun 0:a5f38f79c701 497 B6 = B5 - 4000;
oscarsun 0:a5f38f79c701 498 X1 = (calibration.B2 * ((B6*B6) >> 12))>>11;
oscarsun 0:a5f38f79c701 499 X2 = (calibration.AC2*B6)>>11;
oscarsun 0:a5f38f79c701 500 X3 = X1 + X2;
oscarsun 0:a5f38f79c701 501 B3 = (((calibration.AC1*4 + X3) << oss)+2)/4;
oscarsun 0:a5f38f79c701 502 #ifdef DEBUG
oscarsun 0:a5f38f79c701 503 printf("*****\nB6=%d\nX1=%d\nX2=%d\nX3=%d\nB3=%d\n",B6,X1,X2,X3,B3);
oscarsun 0:a5f38f79c701 504 #endif
oscarsun 0:a5f38f79c701 505 X1 = (calibration.AC3*B6)>>13;
oscarsun 0:a5f38f79c701 506 X2 = (calibration.B1*((B6*B6)>>12))>>16;
oscarsun 0:a5f38f79c701 507 X3 = ((X1+X2)+2)/4;
oscarsun 0:a5f38f79c701 508 B4 = (calibration.AC4*(uint32_t)(X3+32768))>>15;
oscarsun 0:a5f38f79c701 509 #ifdef DEBUG
oscarsun 0:a5f38f79c701 510 printf("X1=%d\nX2=%d\nX3=%d\nB4=%u\n",X1,X2,X3,B4);
oscarsun 0:a5f38f79c701 511 #endif
oscarsun 0:a5f38f79c701 512 B7 = ((uint32_t)UP - B3)*(50000>>oss);
oscarsun 0:a5f38f79c701 513 #ifdef DEBUG
oscarsun 0:a5f38f79c701 514 printf("B7=%u\n",B7);
oscarsun 0:a5f38f79c701 515 #endif
oscarsun 0:a5f38f79c701 516 int32_t P;
oscarsun 0:a5f38f79c701 517 if (B7 < 0x80000000)
oscarsun 0:a5f38f79c701 518 P = (B7*2)/B4;
oscarsun 0:a5f38f79c701 519 else
oscarsun 0:a5f38f79c701 520 P = (B7/B4)*2;
oscarsun 0:a5f38f79c701 521 #ifdef DEBUG
oscarsun 0:a5f38f79c701 522 printf("P=%d\n",P);
oscarsun 0:a5f38f79c701 523 #endif
oscarsun 0:a5f38f79c701 524 X1 = (P>>8)*(P>>8);
oscarsun 0:a5f38f79c701 525 #ifdef DEBUG
oscarsun 0:a5f38f79c701 526 printf("X1=%d\n",X1);
oscarsun 0:a5f38f79c701 527 #endif
oscarsun 0:a5f38f79c701 528 X1 = (X1*3038)>>16;
oscarsun 0:a5f38f79c701 529 #ifdef DEBUG
oscarsun 0:a5f38f79c701 530 printf("X1=%d\n",X1);
oscarsun 0:a5f38f79c701 531 #endif
oscarsun 0:a5f38f79c701 532 X2 = (-7357*P)>>16;
oscarsun 0:a5f38f79c701 533 #ifdef DEBUG
oscarsun 0:a5f38f79c701 534 printf("X2=%d\n",X2);
oscarsun 0:a5f38f79c701 535 #endif
oscarsun 0:a5f38f79c701 536 P = P + (X1+X2+3791)/16;
oscarsun 0:a5f38f79c701 537 #ifdef DEBUG
oscarsun 0:a5f38f79c701 538 printf("P=%d\n",P);
oscarsun 0:a5f38f79c701 539 #endif
oscarsun 0:a5f38f79c701 540
oscarsun 0:a5f38f79c701 541 return P;
oscarsun 0:a5f38f79c701 542
oscarsun 0:a5f38f79c701 543 }
oscarsun 0:a5f38f79c701 544
oscarsun 0:a5f38f79c701 545 // configure the barometer
oscarsun 0:a5f38f79c701 546 void BMP180::init()
oscarsun 0:a5f38f79c701 547 {
oscarsun 0:a5f38f79c701 548 i2c->frequency(400000); // set Fast Mode I2C frequency
oscarsun 0:a5f38f79c701 549
oscarsun 0:a5f38f79c701 550 char data = readByteFromRegister(ID_REG); // Section 4 - datasheet
oscarsun 0:a5f38f79c701 551 if (data != 0x55) { // if correct ID not found, hang and flash error message
oscarsun 0:a5f38f79c701 552 error();
oscarsun 0:a5f38f79c701 553 }
oscarsun 0:a5f38f79c701 554
oscarsun 0:a5f38f79c701 555 readCalibrationData();
oscarsun 0:a5f38f79c701 556
oscarsun 0:a5f38f79c701 557 oss = 1; // standard power oversampling setting
oscarsun 0:a5f38f79c701 558
oscarsun 0:a5f38f79c701 559 #ifdef DEBUG
oscarsun 0:a5f38f79c701 560 oss = 0; // used when testing data sheet example
oscarsun 0:a5f38f79c701 561 #endif
oscarsun 0:a5f38f79c701 562
oscarsun 0:a5f38f79c701 563
oscarsun 0:a5f38f79c701 564 }
oscarsun 0:a5f38f79c701 565
oscarsun 0:a5f38f79c701 566 // Reads factory calibrated data
oscarsun 0:a5f38f79c701 567 void BMP180::readCalibrationData()
oscarsun 0:a5f38f79c701 568 {
oscarsun 0:a5f38f79c701 569
oscarsun 0:a5f38f79c701 570 char eeprom[22];
oscarsun 0:a5f38f79c701 571
oscarsun 0:a5f38f79c701 572 readBytesFromRegister(EEPROM_REG_ADD,22,eeprom);
oscarsun 0:a5f38f79c701 573 // store calibration data in structure
oscarsun 0:a5f38f79c701 574 calibration.AC1 = (int16_t) (eeprom[0] << 8) | eeprom[1];
oscarsun 0:a5f38f79c701 575 calibration.AC2 = (int16_t) (eeprom[2] << 8) | eeprom[3];
oscarsun 0:a5f38f79c701 576 calibration.AC3 = (int16_t) (eeprom[4] << 8) | eeprom[5];
oscarsun 0:a5f38f79c701 577 calibration.AC4 = (uint16_t) (eeprom[6] << 8) | eeprom[7];
oscarsun 0:a5f38f79c701 578 calibration.AC5 = (uint16_t) (eeprom[8] << 8) | eeprom[9];
oscarsun 0:a5f38f79c701 579 calibration.AC6 = (uint16_t) (eeprom[10] << 8) | eeprom[11];
oscarsun 0:a5f38f79c701 580 calibration.B1 = (int16_t) (eeprom[12] << 8) | eeprom[13];
oscarsun 0:a5f38f79c701 581 calibration.B2 = (int16_t) (eeprom[14] << 8) | eeprom[15];
oscarsun 0:a5f38f79c701 582 calibration.MB = (int16_t) (eeprom[16] << 8) | eeprom[17];
oscarsun 0:a5f38f79c701 583 calibration.MC = (int16_t) (eeprom[18] << 8) | eeprom[19];
oscarsun 0:a5f38f79c701 584 calibration.MD = (int16_t) (eeprom[20] << 8) | eeprom[21];
oscarsun 0:a5f38f79c701 585
oscarsun 0:a5f38f79c701 586 // test data from data sheet
oscarsun 0:a5f38f79c701 587 #ifdef DEBUG
oscarsun 0:a5f38f79c701 588 calibration.AC1 = 408;
oscarsun 0:a5f38f79c701 589 calibration.AC2 = -72;
oscarsun 0:a5f38f79c701 590 calibration.AC3 = -14383;
oscarsun 0:a5f38f79c701 591 calibration.AC4 = 32741;
oscarsun 0:a5f38f79c701 592 calibration.AC5 = 32757;
oscarsun 0:a5f38f79c701 593 calibration.AC6 = 23153;
oscarsun 0:a5f38f79c701 594 calibration.B1 = 6190;
oscarsun 0:a5f38f79c701 595 calibration.B2 = 4;
oscarsun 0:a5f38f79c701 596 calibration.MB = -32768;
oscarsun 0:a5f38f79c701 597 calibration.MC = -8711;
oscarsun 0:a5f38f79c701 598 calibration.MD = 2868;
oscarsun 0:a5f38f79c701 599 printf("****EXAMPLE CALIBRATION DATA****\n");
oscarsun 0:a5f38f79c701 600 printf("AC1=%d\nAC2=%d\nAC3=%d\nAC4=%u\nAC5=%u\nAC6=%u\nB1=%d\nB2=%d\nMB=%d\nMC=%d\nMD=%d\n",
oscarsun 0:a5f38f79c701 601 calibration.AC1,calibration.AC2,calibration.AC3,calibration.AC4,calibration.AC5,calibration.AC6,
oscarsun 0:a5f38f79c701 602 calibration.B1,calibration.B2,calibration.MB,calibration.MC,calibration.MD);
oscarsun 0:a5f38f79c701 603 #endif
oscarsun 0:a5f38f79c701 604 }
oscarsun 0:a5f38f79c701 605
oscarsun 0:a5f38f79c701 606
oscarsun 0:a5f38f79c701 607 // reads a byte from a specific register
oscarsun 0:a5f38f79c701 608 char BMP180::readByteFromRegister(char reg)
oscarsun 0:a5f38f79c701 609 {
oscarsun 0:a5f38f79c701 610 int nack = i2c->write(BMP180_W_ADDRESS,&reg,1,true); // send the register address to the slave
oscarsun 0:a5f38f79c701 611 if (nack)
oscarsun 0:a5f38f79c701 612 error(); // if we don't receive acknowledgement, flash error message
oscarsun 0:a5f38f79c701 613
oscarsun 0:a5f38f79c701 614 char rx;
oscarsun 0:a5f38f79c701 615 nack = i2c->read(BMP180_W_ADDRESS,&rx,1); // read a byte from the register and store in buffer
oscarsun 0:a5f38f79c701 616 if (nack)
oscarsun 0:a5f38f79c701 617 error(); // if we don't receive acknowledgement, flash error message
oscarsun 0:a5f38f79c701 618
oscarsun 0:a5f38f79c701 619 return rx;
oscarsun 0:a5f38f79c701 620 }
oscarsun 0:a5f38f79c701 621
oscarsun 0:a5f38f79c701 622 // reads a series of bytes, starting from a specific register
oscarsun 0:a5f38f79c701 623 void BMP180::readBytesFromRegister(char reg,int numberOfBytes,char bytes[])
oscarsun 0:a5f38f79c701 624 {
oscarsun 0:a5f38f79c701 625 int nack = i2c->write(BMP180_W_ADDRESS,&reg,1,true); // send the slave write address and the configuration register address
oscarsun 0:a5f38f79c701 626
oscarsun 0:a5f38f79c701 627 if (nack)
oscarsun 0:a5f38f79c701 628 error(); // if we don't receive acknowledgement, flash error message
oscarsun 0:a5f38f79c701 629
oscarsun 0:a5f38f79c701 630 nack = i2c->read(BMP180_W_ADDRESS,bytes,numberOfBytes); // read bytes
oscarsun 0:a5f38f79c701 631 if (nack)
oscarsun 0:a5f38f79c701 632 error(); // if we don't receive acknowledgement, flash error message
oscarsun 0:a5f38f79c701 633
oscarsun 0:a5f38f79c701 634 }
oscarsun 0:a5f38f79c701 635
oscarsun 0:a5f38f79c701 636 // sends a byte to a specific register
oscarsun 0:a5f38f79c701 637 void BMP180::sendByteToRegister(char byte,char reg)
oscarsun 0:a5f38f79c701 638 {
oscarsun 0:a5f38f79c701 639 char data[2];
oscarsun 0:a5f38f79c701 640 data[0] = reg;
oscarsun 0:a5f38f79c701 641 data[1] = byte;
oscarsun 0:a5f38f79c701 642 // send the register address, followed by the data
oscarsun 0:a5f38f79c701 643 int nack = i2c->write(BMP180_W_ADDRESS,data,2);
oscarsun 0:a5f38f79c701 644 if (nack)
oscarsun 0:a5f38f79c701 645 error(); // if we don't receive acknowledgement, flash error message
oscarsun 0:a5f38f79c701 646
oscarsun 0:a5f38f79c701 647 }
oscarsun 0:a5f38f79c701 648
oscarsun 0:a5f38f79c701 649 void BMP180::error()
oscarsun 0:a5f38f79c701 650 {
oscarsun 0:a5f38f79c701 651 while(1) {
oscarsun 0:a5f38f79c701 652 leds->write(15);
oscarsun 0:a5f38f79c701 653 wait(0.1);
oscarsun 0:a5f38f79c701 654 leds->write(0);
oscarsun 0:a5f38f79c701 655 wait(0.1);
oscarsun 0:a5f38f79c701 656 }
oscarsun 0:a5f38f79c701 657 }
oscarsun 0:a5f38f79c701 658
oscarsun 0:a5f38f79c701 659
oscarsun 0:a5f38f79c701 660 N5110 lcd(p7,p8,p9,p10,p11,p13,p26);//initialize the NOKIA 5110 lcd screen
oscarsun 0:a5f38f79c701 661 BMP180 bmp(p28,p27);//initialize the specific temperature sensor
oscarsun 0:a5f38f79c701 662 BusOut leds(LED4,LED3,LED2,LED1);//initialize the leds of the mbed
oscarsun 0:a5f38f79c701 663 DigitalOut led(p24);//initialize the green led on the printed circuit board
oscarsun 0:a5f38f79c701 664 InterruptIn button(p18);//initialize the button on the printed circuit board
oscarsun 0:a5f38f79c701 665
oscarsun 0:a5f38f79c701 666 #define up 1 // define up is 1
oscarsun 0:a5f38f79c701 667 #define down 0 // define down is 0
oscarsun 0:a5f38f79c701 668
oscarsun 0:a5f38f79c701 669 int state = up;//initialize state to up
oscarsun 0:a5f38f79c701 670
oscarsun 0:a5f38f79c701 671 int buttonFlag = 0;//initialize buttonFlag to down
oscarsun 0:a5f38f79c701 672
oscarsun 0:a5f38f79c701 673 /**
oscarsun 0:a5f38f79c701 674 @Interrupt Service Routine
oscarsun 0:a5f38f79c701 675 */
oscarsun 0:a5f38f79c701 676 void buttonPressed()
oscarsun 0:a5f38f79c701 677 {
oscarsun 0:a5f38f79c701 678 state = !state;//when button is pressed state will be changed
oscarsun 0:a5f38f79c701 679 }
oscarsun 0:a5f38f79c701 680
oscarsun 0:a5f38f79c701 681
oscarsun 0:a5f38f79c701 682 int main()
oscarsun 0:a5f38f79c701 683 {
oscarsun 0:a5f38f79c701 684 lcd.init();//initialize the display screen
oscarsun 0:a5f38f79c701 685 bmp.init();//initialize the temperature sensor
oscarsun 0:a5f38f79c701 686 lcd.printString("Temperature",2,2);//the opening word is temperature
oscarsun 0:a5f38f79c701 687 wait(3.0);//after three seconds start to measuring temperature
oscarsun 0:a5f38f79c701 688 Measurement measurement;//Measurement is a function and measurement is a variable
oscarsun 0:a5f38f79c701 689 button.rise(&buttonPressed);//event generated on rising edge
oscarsun 0:a5f38f79c701 690 led = 1;//set the green led on when turn on the deivce
oscarsun 0:a5f38f79c701 691 while(1)
oscarsun 0:a5f38f79c701 692 {
oscarsun 0:a5f38f79c701 693
oscarsun 0:a5f38f79c701 694 measurement = bmp.readValues();//initialize the value of variable measurement from the function bmp.readValues()
oscarsun 0:a5f38f79c701 695
oscarsun 0:a5f38f79c701 696 char t[14];//create a buffer 't' to store 14 characters
oscarsun 0:a5f38f79c701 697 int length = sprintf(t,"T = %.2f C",measurement.temperature);//print formatted data to buffer 't'
oscarsun 0:a5f38f79c701 698 // it is important the format specifier ensures the length will fit in the buffer
oscarsun 0:a5f38f79c701 699
oscarsun 0:a5f38f79c701 700 float k = measurement.temperature + 273;//a transform function make the unit from Centigrade to Kelvin
oscarsun 0:a5f38f79c701 701 char kel[14];//create a buffer 'kel' to store 14 characters
oscarsun 0:a5f38f79c701 702 length = sprintf(kel,"T = %.2f K",k);//print formatted data to buffer 'kel'
oscarsun 0:a5f38f79c701 703 // it is important the format specifier ensures the length will fit in the buffer
oscarsun 0:a5f38f79c701 704
oscarsun 0:a5f38f79c701 705 char p[14];//create a buffer 'p' to store 14 characters
oscarsun 0:a5f38f79c701 706 length = sprintf(p,"P = %.2f mb",measurement.pressure);//print formatted data to buffer'p'
oscarsun 0:a5f38f79c701 707 // it is important the format specifier ensures the length will fit in the buffer
oscarsun 0:a5f38f79c701 708
oscarsun 0:a5f38f79c701 709 wait(0.5);//after one second to do next measurement
oscarsun 0:a5f38f79c701 710 lcd.clear();//clear the buffer
oscarsun 0:a5f38f79c701 711
oscarsun 0:a5f38f79c701 712
oscarsun 0:a5f38f79c701 713 switch(state)
oscarsun 0:a5f38f79c701 714 {
oscarsun 0:a5f38f79c701 715 case up:// at up case
oscarsun 0:a5f38f79c701 716 state = 1;//let state to 1
oscarsun 0:a5f38f79c701 717 lcd.printString(t,0,1);//display the temperature in centigrade on the lcd screen
oscarsun 0:a5f38f79c701 718 lcd.printString(p,0,3);//display the atmospheric pressure on the lcd screen
oscarsun 0:a5f38f79c701 719 break;//out of the function
oscarsun 0:a5f38f79c701 720 case down://at down case
oscarsun 0:a5f38f79c701 721 state = 0;//let state to 0
oscarsun 0:a5f38f79c701 722 lcd.printString(kel,0,1);//display the temperature in kelvin on the lcd screen
oscarsun 0:a5f38f79c701 723 lcd.printString(p,0,3);//display the atmospheric pressure on the lcd screen
oscarsun 0:a5f38f79c701 724 break;//out of the function
oscarsun 0:a5f38f79c701 725 default:
oscarsun 0:a5f38f79c701 726 break;
oscarsun 0:a5f38f79c701 727 }
oscarsun 0:a5f38f79c701 728
oscarsun 0:a5f38f79c701 729 if(measurement.temperature > 25.00)//when the value of variable temperature is bigger than 25
oscarsun 0:a5f38f79c701 730 {
oscarsun 0:a5f38f79c701 731 led =1;//led will be on state
oscarsun 0:a5f38f79c701 732 wait(0.1);//led will blink in each 0.1 second
oscarsun 0:a5f38f79c701 733 led =0;//led will be down state
oscarsun 0:a5f38f79c701 734 wait(0.1);//led will blink in each 0.1 second
oscarsun 0:a5f38f79c701 735 }
oscarsun 0:a5f38f79c701 736
oscarsun 0:a5f38f79c701 737 }
oscarsun 0:a5f38f79c701 738 }
oscarsun 0:a5f38f79c701 739
oscarsun 0:a5f38f79c701 740
oscarsun 0:a5f38f79c701 741
oscarsun 0:a5f38f79c701 742
oscarsun 0:a5f38f79c701 743
oscarsun 0:a5f38f79c701 744
oscarsun 0:a5f38f79c701 745
oscarsun 0:a5f38f79c701 746