(DA) Internet of Things and Smart Electronics- ELE3006M2122 / Mbed 2 deprecated IOTProject_LC1

legionella detector

Dependencies:   mbed

N5110/N5110.cpp@0:089b4c4f2b6f, 23 months ago (annotated)

Committer:
lewiscameron
Date:
Tue Aug 23 08:47:11 2022 +0000
Revision:
0:089b4c4f2b6f
h

Who changed what in which revision?

UserRevisionLine numberNew contents of line
lewiscameron 0:089b4c4f2b6f 1 #include "mbed.h"
lewiscameron 0:089b4c4f2b6f 2 #include "N5110.h"
lewiscameron 0:089b4c4f2b6f 3
lewiscameron 0:089b4c4f2b6f 4 // overloaded constructor includes power pin - LCD Vcc connected to GPIO pin
lewiscameron 0:089b4c4f2b6f 5 // this constructor works fine with LPC1768 - enough current sourced from GPIO
lewiscameron 0:089b4c4f2b6f 6 // to power LCD. Doesn't work well with K64F.
lewiscameron 0:089b4c4f2b6f 7 N5110::N5110(PinName const pwrPin,
lewiscameron 0:089b4c4f2b6f 8 PinName const scePin,
lewiscameron 0:089b4c4f2b6f 9 PinName const rstPin,
lewiscameron 0:089b4c4f2b6f 10 PinName const dcPin,
lewiscameron 0:089b4c4f2b6f 11 PinName const mosiPin,
lewiscameron 0:089b4c4f2b6f 12 PinName const sclkPin,
lewiscameron 0:089b4c4f2b6f 13 PinName const ledPin)
lewiscameron 0:089b4c4f2b6f 14 :
lewiscameron 0:089b4c4f2b6f 15 _spi(new SPI(mosiPin,NC,sclkPin)), // create new SPI instance and initialise
lewiscameron 0:089b4c4f2b6f 16 _led(new PwmOut(ledPin)),
lewiscameron 0:089b4c4f2b6f 17 _pwr(new DigitalOut(pwrPin)),
lewiscameron 0:089b4c4f2b6f 18 _sce(new DigitalOut(scePin)),
lewiscameron 0:089b4c4f2b6f 19 _rst(new DigitalOut(rstPin)),
lewiscameron 0:089b4c4f2b6f 20 _dc(new DigitalOut(dcPin))
lewiscameron 0:089b4c4f2b6f 21 {}
lewiscameron 0:089b4c4f2b6f 22
lewiscameron 0:089b4c4f2b6f 23 // overloaded constructor does not include power pin - LCD Vcc must be tied to +3V3
lewiscameron 0:089b4c4f2b6f 24 // Best to use this with K64F as the GPIO hasn't sufficient output current to reliably
lewiscameron 0:089b4c4f2b6f 25 // drive the LCD.
lewiscameron 0:089b4c4f2b6f 26 N5110::N5110(PinName const scePin,
lewiscameron 0:089b4c4f2b6f 27 PinName const rstPin,
lewiscameron 0:089b4c4f2b6f 28 PinName const dcPin,
lewiscameron 0:089b4c4f2b6f 29 PinName const mosiPin,
lewiscameron 0:089b4c4f2b6f 30 PinName const sclkPin,
lewiscameron 0:089b4c4f2b6f 31 PinName const ledPin)
lewiscameron 0:089b4c4f2b6f 32 :
lewiscameron 0:089b4c4f2b6f 33 _spi(new SPI(mosiPin,NC,sclkPin)), // create new SPI instance and initialise
lewiscameron 0:089b4c4f2b6f 34 _led(new PwmOut(ledPin)),
lewiscameron 0:089b4c4f2b6f 35 _pwr(NULL), // pwr not needed so null it to be safe
lewiscameron 0:089b4c4f2b6f 36 _sce(new DigitalOut(scePin)),
lewiscameron 0:089b4c4f2b6f 37 _rst(new DigitalOut(rstPin)),
lewiscameron 0:089b4c4f2b6f 38 _dc(new DigitalOut(dcPin))
lewiscameron 0:089b4c4f2b6f 39 {}
lewiscameron 0:089b4c4f2b6f 40
lewiscameron 0:089b4c4f2b6f 41 N5110::~N5110()
lewiscameron 0:089b4c4f2b6f 42 {
lewiscameron 0:089b4c4f2b6f 43 delete _spi;
lewiscameron 0:089b4c4f2b6f 44
lewiscameron 0:089b4c4f2b6f 45 if(_pwr) {
lewiscameron 0:089b4c4f2b6f 46 delete _pwr;
lewiscameron 0:089b4c4f2b6f 47 }
lewiscameron 0:089b4c4f2b6f 48
lewiscameron 0:089b4c4f2b6f 49 delete _led;
lewiscameron 0:089b4c4f2b6f 50 delete _sce;
lewiscameron 0:089b4c4f2b6f 51 delete _rst;
lewiscameron 0:089b4c4f2b6f 52 delete _dc;
lewiscameron 0:089b4c4f2b6f 53 }
lewiscameron 0:089b4c4f2b6f 54
lewiscameron 0:089b4c4f2b6f 55 // initialise function - powers up and sends the initialisation commands
lewiscameron 0:089b4c4f2b6f 56 void N5110::init()
lewiscameron 0:089b4c4f2b6f 57 {
lewiscameron 0:089b4c4f2b6f 58 turnOn(); // power up
lewiscameron 0:089b4c4f2b6f 59 wait_ms(10); // small delay seems to prevent spurious pixels during mbed reset
lewiscameron 0:089b4c4f2b6f 60 reset(); // reset LCD - must be done within 100 ms
lewiscameron 0:089b4c4f2b6f 61 // initSPI();
lewiscameron 0:089b4c4f2b6f 62
lewiscameron 0:089b4c4f2b6f 63 setContrast(0.55); // this may need tuning (say 0.4 to 0.6)
lewiscameron 0:089b4c4f2b6f 64 setBias(3); // datasheet - 48:1 mux - don't mess with if you don't know what you're doing! (0 to 7)
lewiscameron 0:089b4c4f2b6f 65 setTempCoefficient(0); // datasheet - may need increasing (range 0 to 3) at very low temperatures
lewiscameron 0:089b4c4f2b6f 66 normalMode(); // normal video mode by default
lewiscameron 0:089b4c4f2b6f 67
lewiscameron 0:089b4c4f2b6f 68 clearRAM(); // RAM is undefined at power-up so clear to be sure
lewiscameron 0:089b4c4f2b6f 69 clear(); // clear buffer
lewiscameron 0:089b4c4f2b6f 70 setBrightness(0.5);
lewiscameron 0:089b4c4f2b6f 71 }
lewiscameron 0:089b4c4f2b6f 72
lewiscameron 0:089b4c4f2b6f 73 // sets normal video mode (black on white)
lewiscameron 0:089b4c4f2b6f 74 void N5110::normalMode()
lewiscameron 0:089b4c4f2b6f 75 {
lewiscameron 0:089b4c4f2b6f 76 sendCommand(0b00100000); // basic instruction
lewiscameron 0:089b4c4f2b6f 77 sendCommand(0b00001100); // normal video mode- datasheet
lewiscameron 0:089b4c4f2b6f 78 }
lewiscameron 0:089b4c4f2b6f 79
lewiscameron 0:089b4c4f2b6f 80 // sets normal video mode (white on black)
lewiscameron 0:089b4c4f2b6f 81 void N5110::inverseMode()
lewiscameron 0:089b4c4f2b6f 82 {
lewiscameron 0:089b4c4f2b6f 83 sendCommand(0b00100000); // basic instruction
lewiscameron 0:089b4c4f2b6f 84 sendCommand(0b00001101); // inverse video mode - datasheet
lewiscameron 0:089b4c4f2b6f 85 }
lewiscameron 0:089b4c4f2b6f 86
lewiscameron 0:089b4c4f2b6f 87 // function to power up the LCD and backlight - only works when using GPIO to power
lewiscameron 0:089b4c4f2b6f 88 void N5110::turnOn()
lewiscameron 0:089b4c4f2b6f 89 {
lewiscameron 0:089b4c4f2b6f 90 if (_pwr != NULL) {
lewiscameron 0:089b4c4f2b6f 91 _pwr->write(1); // apply power
lewiscameron 0:089b4c4f2b6f 92 }
lewiscameron 0:089b4c4f2b6f 93 }
lewiscameron 0:089b4c4f2b6f 94
lewiscameron 0:089b4c4f2b6f 95 // function to power down LCD
lewiscameron 0:089b4c4f2b6f 96 void N5110::turnOff()
lewiscameron 0:089b4c4f2b6f 97 {
lewiscameron 0:089b4c4f2b6f 98 clear(); // clear buffer
lewiscameron 0:089b4c4f2b6f 99 refresh();
lewiscameron 0:089b4c4f2b6f 100 setBrightness(0.0); // turn backlight off
lewiscameron 0:089b4c4f2b6f 101 clearRAM(); // clear RAM to ensure specified current consumption
lewiscameron 0:089b4c4f2b6f 102 // send command to ensure we are in basic mode
lewiscameron 0:089b4c4f2b6f 103
lewiscameron 0:089b4c4f2b6f 104 sendCommand(0b00100000); // basic mode
lewiscameron 0:089b4c4f2b6f 105 sendCommand(0b00001000); // clear display
lewiscameron 0:089b4c4f2b6f 106 sendCommand(0b00100001); // extended mode
lewiscameron 0:089b4c4f2b6f 107 sendCommand(0b00100100); // power down
lewiscameron 0:089b4c4f2b6f 108
lewiscameron 0:089b4c4f2b6f 109 // if we are powering the LCD using the GPIO then make it low to turn off
lewiscameron 0:089b4c4f2b6f 110 if (_pwr != NULL) {
lewiscameron 0:089b4c4f2b6f 111 wait_ms(10); // small delay and then turn off the power pin
lewiscameron 0:089b4c4f2b6f 112 _pwr->write(0); // turn off power
lewiscameron 0:089b4c4f2b6f 113 }
lewiscameron 0:089b4c4f2b6f 114
lewiscameron 0:089b4c4f2b6f 115 }
lewiscameron 0:089b4c4f2b6f 116
lewiscameron 0:089b4c4f2b6f 117 // function to change LED backlight brightness
lewiscameron 0:089b4c4f2b6f 118 void N5110::setBrightness(float brightness)
lewiscameron 0:089b4c4f2b6f 119 {
lewiscameron 0:089b4c4f2b6f 120 // check whether brightness is within range
lewiscameron 0:089b4c4f2b6f 121 if (brightness < 0.0f)
lewiscameron 0:089b4c4f2b6f 122 brightness = 0.0f;
lewiscameron 0:089b4c4f2b6f 123 if (brightness > 1.0f)
lewiscameron 0:089b4c4f2b6f 124 brightness = 1.0f;
lewiscameron 0:089b4c4f2b6f 125 // set PWM duty cycle
lewiscameron 0:089b4c4f2b6f 126 _led->write(brightness);
lewiscameron 0:089b4c4f2b6f 127 }
lewiscameron 0:089b4c4f2b6f 128
lewiscameron 0:089b4c4f2b6f 129 void N5110::setContrast(float contrast) {
lewiscameron 0:089b4c4f2b6f 130
lewiscameron 0:089b4c4f2b6f 131 // enforce limits
lewiscameron 0:089b4c4f2b6f 132 if (contrast > 1.0f)
lewiscameron 0:089b4c4f2b6f 133 contrast = 1.0f;
lewiscameron 0:089b4c4f2b6f 134 else if (contrast < 0.0f)
lewiscameron 0:089b4c4f2b6f 135 contrast = 0.0;
lewiscameron 0:089b4c4f2b6f 136
lewiscameron 0:089b4c4f2b6f 137 // convert to char in range 0 to 127 (i.e. 6 bits)
lewiscameron 0:089b4c4f2b6f 138 char ic = char(contrast*127.0f);
lewiscameron 0:089b4c4f2b6f 139
lewiscameron 0:089b4c4f2b6f 140 sendCommand(0b00100001); // extended instruction set
lewiscameron 0:089b4c4f2b6f 141 sendCommand(0b10000000 | ic); // set Vop (which controls contrast)
lewiscameron 0:089b4c4f2b6f 142 sendCommand(0b00100000); // back to basic instruction set
lewiscameron 0:089b4c4f2b6f 143 }
lewiscameron 0:089b4c4f2b6f 144
lewiscameron 0:089b4c4f2b6f 145 void N5110::setTempCoefficient(char tc) {
lewiscameron 0:089b4c4f2b6f 146
lewiscameron 0:089b4c4f2b6f 147 // enforce limits
lewiscameron 0:089b4c4f2b6f 148 if (tc>3) {
lewiscameron 0:089b4c4f2b6f 149 tc=3;
lewiscameron 0:089b4c4f2b6f 150 }
lewiscameron 0:089b4c4f2b6f 151
lewiscameron 0:089b4c4f2b6f 152 // temperature coefficient may need increasing at low temperatures
lewiscameron 0:089b4c4f2b6f 153
lewiscameron 0:089b4c4f2b6f 154 sendCommand(0b00100001); // extended instruction set
lewiscameron 0:089b4c4f2b6f 155 sendCommand(0b00000100 | tc);
lewiscameron 0:089b4c4f2b6f 156 sendCommand(0b00100000); // back to basic instruction set
lewiscameron 0:089b4c4f2b6f 157 }
lewiscameron 0:089b4c4f2b6f 158
lewiscameron 0:089b4c4f2b6f 159 void N5110::setBias(char bias) {
lewiscameron 0:089b4c4f2b6f 160
lewiscameron 0:089b4c4f2b6f 161 // from data sheet
lewiscameron 0:089b4c4f2b6f 162 // bias mux rate
lewiscameron 0:089b4c4f2b6f 163 // 0 1:100
lewiscameron 0:089b4c4f2b6f 164 // 1 1:80
lewiscameron 0:089b4c4f2b6f 165 // 2 1:65
lewiscameron 0:089b4c4f2b6f 166 // 3 1:48 (default)
lewiscameron 0:089b4c4f2b6f 167 // 4 1:40/1:34
lewiscameron 0:089b4c4f2b6f 168 // 5 1:24
lewiscameron 0:089b4c4f2b6f 169 // 6 1:18/1:16
lewiscameron 0:089b4c4f2b6f 170 // 7 1:10/1:9/1:8
lewiscameron 0:089b4c4f2b6f 171
lewiscameron 0:089b4c4f2b6f 172 // enforce limits
lewiscameron 0:089b4c4f2b6f 173 if (bias>7) {
lewiscameron 0:089b4c4f2b6f 174 bias=7;
lewiscameron 0:089b4c4f2b6f 175 }
lewiscameron 0:089b4c4f2b6f 176
lewiscameron 0:089b4c4f2b6f 177 sendCommand(0b00100001); // extended mode instruction
lewiscameron 0:089b4c4f2b6f 178 sendCommand(0b00010000 | bias);
lewiscameron 0:089b4c4f2b6f 179 sendCommand(0b00100000); // end of extended mode instruction
lewiscameron 0:089b4c4f2b6f 180 }
lewiscameron 0:089b4c4f2b6f 181
lewiscameron 0:089b4c4f2b6f 182 // pulse the active low reset line
lewiscameron 0:089b4c4f2b6f 183 void N5110::reset()
lewiscameron 0:089b4c4f2b6f 184 {
lewiscameron 0:089b4c4f2b6f 185 _rst->write(0); // reset the LCD
lewiscameron 0:089b4c4f2b6f 186 _rst->write(1);
lewiscameron 0:089b4c4f2b6f 187 }
lewiscameron 0:089b4c4f2b6f 188
lewiscameron 0:089b4c4f2b6f 189 // function to initialise SPI peripheral
lewiscameron 0:089b4c4f2b6f 190 void N5110::initSPI()
lewiscameron 0:089b4c4f2b6f 191 {
lewiscameron 0:089b4c4f2b6f 192 _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
lewiscameron 0:089b4c4f2b6f 193 _spi->frequency(4000000); // maximum of screen is 4 MHz
lewiscameron 0:089b4c4f2b6f 194 }
lewiscameron 0:089b4c4f2b6f 195
lewiscameron 0:089b4c4f2b6f 196 // send a command to the display
lewiscameron 0:089b4c4f2b6f 197 void N5110::sendCommand(unsigned char command)
lewiscameron 0:089b4c4f2b6f 198 {
lewiscameron 0:089b4c4f2b6f 199 _dc->write(0); // set DC low for command
lewiscameron 0:089b4c4f2b6f 200 _sce->write(0); // set CE low to begin frame
lewiscameron 0:089b4c4f2b6f 201 _spi->write(command); // send command
lewiscameron 0:089b4c4f2b6f 202 _dc->write(1); // turn back to data by default
lewiscameron 0:089b4c4f2b6f 203 _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
lewiscameron 0:089b4c4f2b6f 204 }
lewiscameron 0:089b4c4f2b6f 205
lewiscameron 0:089b4c4f2b6f 206 // send data to the display at the current XY address
lewiscameron 0:089b4c4f2b6f 207 // dc is set to 1 (i.e. data) after sending a command and so should
lewiscameron 0:089b4c4f2b6f 208 // be the default mode.
lewiscameron 0:089b4c4f2b6f 209 void N5110::sendData(unsigned char data)
lewiscameron 0:089b4c4f2b6f 210 {
lewiscameron 0:089b4c4f2b6f 211 _sce->write(0); // set CE low to begin frame
lewiscameron 0:089b4c4f2b6f 212 _spi->write(data);
lewiscameron 0:089b4c4f2b6f 213 _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
lewiscameron 0:089b4c4f2b6f 214 }
lewiscameron 0:089b4c4f2b6f 215
lewiscameron 0:089b4c4f2b6f 216 // this function writes 0 to the 504 bytes to clear the RAM
lewiscameron 0:089b4c4f2b6f 217 void N5110::clearRAM()
lewiscameron 0:089b4c4f2b6f 218 {
lewiscameron 0:089b4c4f2b6f 219 _sce->write(0); //set CE low to begin frame
lewiscameron 0:089b4c4f2b6f 220 for(int i = 0; i < WIDTH * HEIGHT; i++) { // 48 x 84 bits = 504 bytes
lewiscameron 0:089b4c4f2b6f 221 _spi->write(0x00); // send 0's
lewiscameron 0:089b4c4f2b6f 222 }
lewiscameron 0:089b4c4f2b6f 223 _sce->write(1); // set CE high to end frame
lewiscameron 0:089b4c4f2b6f 224 }
lewiscameron 0:089b4c4f2b6f 225
lewiscameron 0:089b4c4f2b6f 226 // function to set the XY address in RAM for subsequenct data write
lewiscameron 0:089b4c4f2b6f 227 void N5110::setXYAddress(unsigned int const x,
lewiscameron 0:089b4c4f2b6f 228 unsigned int const y)
lewiscameron 0:089b4c4f2b6f 229 {
lewiscameron 0:089b4c4f2b6f 230 if (x<WIDTH && y<HEIGHT) { // check within range
lewiscameron 0:089b4c4f2b6f 231 sendCommand(0b00100000); // basic instruction
lewiscameron 0:089b4c4f2b6f 232 sendCommand(0b10000000 | x); // send addresses to display with relevant mask
lewiscameron 0:089b4c4f2b6f 233 sendCommand(0b01000000 | y);
lewiscameron 0:089b4c4f2b6f 234 }
lewiscameron 0:089b4c4f2b6f 235 }
lewiscameron 0:089b4c4f2b6f 236
lewiscameron 0:089b4c4f2b6f 237 // These functions are used to set, clear and get the value of pixels in the display
lewiscameron 0:089b4c4f2b6f 238 // Pixels are addressed in the range of 0 to 47 (y) and 0 to 83 (x). The refresh()
lewiscameron 0:089b4c4f2b6f 239 // function must be called after set and clear in order to update the display
lewiscameron 0:089b4c4f2b6f 240 void N5110::setPixel(unsigned int const x,
lewiscameron 0:089b4c4f2b6f 241 unsigned int const y,
lewiscameron 0:089b4c4f2b6f 242 bool const state)
lewiscameron 0:089b4c4f2b6f 243 {
lewiscameron 0:089b4c4f2b6f 244 if (x<WIDTH && y<HEIGHT) { // check within range
lewiscameron 0:089b4c4f2b6f 245 // calculate bank and shift 1 to required position in the data byte
lewiscameron 0:089b4c4f2b6f 246 if(state) buffer[x][y/8] |= (1 << y%8);
lewiscameron 0:089b4c4f2b6f 247 else buffer[x][y/8] &= ~(1 << y%8);
lewiscameron 0:089b4c4f2b6f 248 }
lewiscameron 0:089b4c4f2b6f 249 }
lewiscameron 0:089b4c4f2b6f 250
lewiscameron 0:089b4c4f2b6f 251 void N5110::clearPixel(unsigned int const x,
lewiscameron 0:089b4c4f2b6f 252 unsigned int const y)
lewiscameron 0:089b4c4f2b6f 253 {
lewiscameron 0:089b4c4f2b6f 254 if (x<WIDTH && y<HEIGHT) { // check within range
lewiscameron 0:089b4c4f2b6f 255 // calculate bank and shift 1 to required position (using bit clear)
lewiscameron 0:089b4c4f2b6f 256 buffer[x][y/8] &= ~(1 << y%8);
lewiscameron 0:089b4c4f2b6f 257 }
lewiscameron 0:089b4c4f2b6f 258 }
lewiscameron 0:089b4c4f2b6f 259
lewiscameron 0:089b4c4f2b6f 260 int N5110::getPixel(unsigned int const x,
lewiscameron 0:089b4c4f2b6f 261 unsigned int const y) const
lewiscameron 0:089b4c4f2b6f 262 {
lewiscameron 0:089b4c4f2b6f 263 if (x<WIDTH && y<HEIGHT) { // check within range
lewiscameron 0:089b4c4f2b6f 264 // return relevant bank and mask required bit
lewiscameron 0:089b4c4f2b6f 265
lewiscameron 0:089b4c4f2b6f 266 int pixel = (int) buffer[x][y/8] & (1 << y%8);
lewiscameron 0:089b4c4f2b6f 267
lewiscameron 0:089b4c4f2b6f 268 if (pixel)
lewiscameron 0:089b4c4f2b6f 269 return 1;
lewiscameron 0:089b4c4f2b6f 270 else
lewiscameron 0:089b4c4f2b6f 271 return 0;
lewiscameron 0:089b4c4f2b6f 272 }
lewiscameron 0:089b4c4f2b6f 273
lewiscameron 0:089b4c4f2b6f 274 return 0;
lewiscameron 0:089b4c4f2b6f 275
lewiscameron 0:089b4c4f2b6f 276 }
lewiscameron 0:089b4c4f2b6f 277
lewiscameron 0:089b4c4f2b6f 278 // function to refresh the display
lewiscameron 0:089b4c4f2b6f 279 void N5110::refresh()
lewiscameron 0:089b4c4f2b6f 280 {
lewiscameron 0:089b4c4f2b6f 281 setXYAddress(0,0); // important to set address back to 0,0 before refreshing display
lewiscameron 0:089b4c4f2b6f 282 // address auto increments after printing string, so buffer[0][0] will not coincide
lewiscameron 0:089b4c4f2b6f 283 // with top-left pixel after priting string
lewiscameron 0:089b4c4f2b6f 284
lewiscameron 0:089b4c4f2b6f 285 _sce->write(0); //set CE low to begin frame
lewiscameron 0:089b4c4f2b6f 286
lewiscameron 0:089b4c4f2b6f 287 for(int j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
lewiscameron 0:089b4c4f2b6f 288 for(int i = 0; i < WIDTH; i++) {
lewiscameron 0:089b4c4f2b6f 289 _spi->write(buffer[i][j]); // send buffer
lewiscameron 0:089b4c4f2b6f 290 }
lewiscameron 0:089b4c4f2b6f 291 }
lewiscameron 0:089b4c4f2b6f 292 _sce->write(1); // set CE high to end frame
lewiscameron 0:089b4c4f2b6f 293
lewiscameron 0:089b4c4f2b6f 294 }
lewiscameron 0:089b4c4f2b6f 295
lewiscameron 0:089b4c4f2b6f 296 // fills the buffer with random bytes. Can be used to test the display.
lewiscameron 0:089b4c4f2b6f 297 // The rand() function isn't seeded so it probably creates the same pattern everytime
lewiscameron 0:089b4c4f2b6f 298 void N5110::randomiseBuffer()
lewiscameron 0:089b4c4f2b6f 299 {
lewiscameron 0:089b4c4f2b6f 300 int i,j;
lewiscameron 0:089b4c4f2b6f 301 for(j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
lewiscameron 0:089b4c4f2b6f 302 for(i = 0; i < WIDTH; i++) {
lewiscameron 0:089b4c4f2b6f 303 buffer[i][j] = rand()%256; // generate random byte
lewiscameron 0:089b4c4f2b6f 304 }
lewiscameron 0:089b4c4f2b6f 305 }
lewiscameron 0:089b4c4f2b6f 306
lewiscameron 0:089b4c4f2b6f 307 }
lewiscameron 0:089b4c4f2b6f 308
lewiscameron 0:089b4c4f2b6f 309 // function to print 5x7 font
lewiscameron 0:089b4c4f2b6f 310 void N5110::printChar(char const c,
lewiscameron 0:089b4c4f2b6f 311 unsigned int const x,
lewiscameron 0:089b4c4f2b6f 312 unsigned int const y)
lewiscameron 0:089b4c4f2b6f 313 {
lewiscameron 0:089b4c4f2b6f 314 if (y<BANKS) { // check if printing in range of y banks
lewiscameron 0:089b4c4f2b6f 315
lewiscameron 0:089b4c4f2b6f 316 for (int i = 0; i < 5 ; i++ ) {
lewiscameron 0:089b4c4f2b6f 317 int pixel_x = x+i;
lewiscameron 0:089b4c4f2b6f 318 if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83)
lewiscameron 0:089b4c4f2b6f 319 break;
lewiscameron 0:089b4c4f2b6f 320 buffer[pixel_x][y] = font5x7[(c - 32)*5 + i];
lewiscameron 0:089b4c4f2b6f 321 // array is offset by 32 relative to ASCII, each character is 5 pixels wide
lewiscameron 0:089b4c4f2b6f 322 }
lewiscameron 0:089b4c4f2b6f 323
lewiscameron 0:089b4c4f2b6f 324 }
lewiscameron 0:089b4c4f2b6f 325 }
lewiscameron 0:089b4c4f2b6f 326
lewiscameron 0:089b4c4f2b6f 327 // function to print string at specified position
lewiscameron 0:089b4c4f2b6f 328 void N5110::printString(const char *str,
lewiscameron 0:089b4c4f2b6f 329 unsigned int const x,
lewiscameron 0:089b4c4f2b6f 330 unsigned int const y)
lewiscameron 0:089b4c4f2b6f 331 {
lewiscameron 0:089b4c4f2b6f 332 if (y<BANKS) { // check if printing in range of y banks
lewiscameron 0:089b4c4f2b6f 333
lewiscameron 0:089b4c4f2b6f 334 int n = 0 ; // counter for number of characters in string
lewiscameron 0:089b4c4f2b6f 335 // loop through string and print character
lewiscameron 0:089b4c4f2b6f 336 while(*str) {
lewiscameron 0:089b4c4f2b6f 337
lewiscameron 0:089b4c4f2b6f 338 // writes the character bitmap data to the buffer, so that
lewiscameron 0:089b4c4f2b6f 339 // text and pixels can be displayed at the same time
lewiscameron 0:089b4c4f2b6f 340 for (int i = 0; i < 5 ; i++ ) {
lewiscameron 0:089b4c4f2b6f 341 int pixel_x = x+i+n*6;
lewiscameron 0:089b4c4f2b6f 342 if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83)
lewiscameron 0:089b4c4f2b6f 343 break;
lewiscameron 0:089b4c4f2b6f 344 buffer[pixel_x][y] = font5x7[(*str - 32)*5 + i];
lewiscameron 0:089b4c4f2b6f 345 }
lewiscameron 0:089b4c4f2b6f 346 str++; // go to next character in string
lewiscameron 0:089b4c4f2b6f 347 n++; // increment index
lewiscameron 0:089b4c4f2b6f 348 }
lewiscameron 0:089b4c4f2b6f 349 }
lewiscameron 0:089b4c4f2b6f 350 }
lewiscameron 0:089b4c4f2b6f 351
lewiscameron 0:089b4c4f2b6f 352 // function to clear the screen buffer
lewiscameron 0:089b4c4f2b6f 353 void N5110::clear()
lewiscameron 0:089b4c4f2b6f 354 {
lewiscameron 0:089b4c4f2b6f 355 memset(buffer,0,sizeof(buffer));
lewiscameron 0:089b4c4f2b6f 356 }
lewiscameron 0:089b4c4f2b6f 357
lewiscameron 0:089b4c4f2b6f 358 // function to plot array on display
lewiscameron 0:089b4c4f2b6f 359 void N5110::plotArray(float const array[])
lewiscameron 0:089b4c4f2b6f 360 {
lewiscameron 0:089b4c4f2b6f 361 for (int i=0; i<WIDTH; i++) { // loop through array
lewiscameron 0:089b4c4f2b6f 362 // elements are normalised from 0.0 to 1.0, so multiply
lewiscameron 0:089b4c4f2b6f 363 // by 47 to convert to pixel range, and subtract from 47
lewiscameron 0:089b4c4f2b6f 364 // since top-left is 0,0 in the display geometry
lewiscameron 0:089b4c4f2b6f 365 setPixel(i,47 - int(array[i]*47.0f),true);
lewiscameron 0:089b4c4f2b6f 366 }
lewiscameron 0:089b4c4f2b6f 367
lewiscameron 0:089b4c4f2b6f 368 }
lewiscameron 0:089b4c4f2b6f 369
lewiscameron 0:089b4c4f2b6f 370 // function to draw circle
lewiscameron 0:089b4c4f2b6f 371 void N5110:: drawCircle(unsigned int const x0,
lewiscameron 0:089b4c4f2b6f 372 unsigned int const y0,
lewiscameron 0:089b4c4f2b6f 373 unsigned int const radius,
lewiscameron 0:089b4c4f2b6f 374 FillType const fill)
lewiscameron 0:089b4c4f2b6f 375 {
lewiscameron 0:089b4c4f2b6f 376 // from http://en.wikipedia.org/wiki/Midpoint_circle_algorithm
lewiscameron 0:089b4c4f2b6f 377 int x = radius;
lewiscameron 0:089b4c4f2b6f 378 int y = 0;
lewiscameron 0:089b4c4f2b6f 379 int radiusError = 1-x;
lewiscameron 0:089b4c4f2b6f 380
lewiscameron 0:089b4c4f2b6f 381 while(x >= y) {
lewiscameron 0:089b4c4f2b6f 382
lewiscameron 0:089b4c4f2b6f 383 // if transparent, just draw outline
lewiscameron 0:089b4c4f2b6f 384 if (fill == FILL_TRANSPARENT) {
lewiscameron 0:089b4c4f2b6f 385 setPixel( x + x0, y + y0,true);
lewiscameron 0:089b4c4f2b6f 386 setPixel(-x + x0, y + y0,true);
lewiscameron 0:089b4c4f2b6f 387 setPixel( y + x0, x + y0,true);
lewiscameron 0:089b4c4f2b6f 388 setPixel(-y + x0, x + y0,true);
lewiscameron 0:089b4c4f2b6f 389 setPixel(-y + x0, -x + y0,true);
lewiscameron 0:089b4c4f2b6f 390 setPixel( y + x0, -x + y0,true);
lewiscameron 0:089b4c4f2b6f 391 setPixel( x + x0, -y + y0,true);
lewiscameron 0:089b4c4f2b6f 392 setPixel(-x + x0, -y + y0,true);
lewiscameron 0:089b4c4f2b6f 393 } else { // drawing filled circle, so draw lines between points at same y value
lewiscameron 0:089b4c4f2b6f 394
lewiscameron 0:089b4c4f2b6f 395 int type = (fill==FILL_BLACK) ? 1:0; // black or white fill
lewiscameron 0:089b4c4f2b6f 396
lewiscameron 0:089b4c4f2b6f 397 drawLine(x+x0,y+y0,-x+x0,y+y0,type);
lewiscameron 0:089b4c4f2b6f 398 drawLine(y+x0,x+y0,-y+x0,x+y0,type);
lewiscameron 0:089b4c4f2b6f 399 drawLine(y+x0,-x+y0,-y+x0,-x+y0,type);
lewiscameron 0:089b4c4f2b6f 400 drawLine(x+x0,-y+y0,-x+x0,-y+y0,type);
lewiscameron 0:089b4c4f2b6f 401 }
lewiscameron 0:089b4c4f2b6f 402
lewiscameron 0:089b4c4f2b6f 403 y++;
lewiscameron 0:089b4c4f2b6f 404 if (radiusError<0) {
lewiscameron 0:089b4c4f2b6f 405 radiusError += 2 * y + 1;
lewiscameron 0:089b4c4f2b6f 406 } else {
lewiscameron 0:089b4c4f2b6f 407 x--;
lewiscameron 0:089b4c4f2b6f 408 radiusError += 2 * (y - x) + 1;
lewiscameron 0:089b4c4f2b6f 409 }
lewiscameron 0:089b4c4f2b6f 410 }
lewiscameron 0:089b4c4f2b6f 411
lewiscameron 0:089b4c4f2b6f 412 }
lewiscameron 0:089b4c4f2b6f 413
lewiscameron 0:089b4c4f2b6f 414 void N5110::drawLine(unsigned int const x0,
lewiscameron 0:089b4c4f2b6f 415 unsigned int const y0,
lewiscameron 0:089b4c4f2b6f 416 unsigned int const x1,
lewiscameron 0:089b4c4f2b6f 417 unsigned int const y1,
lewiscameron 0:089b4c4f2b6f 418 unsigned int const type)
lewiscameron 0:089b4c4f2b6f 419 {
lewiscameron 0:089b4c4f2b6f 420 // Note that the ranges can be negative so we have to turn the input values
lewiscameron 0:089b4c4f2b6f 421 // into signed integers first
lewiscameron 0:089b4c4f2b6f 422 int const y_range = static_cast<int>(y1) - static_cast<int>(y0);
lewiscameron 0:089b4c4f2b6f 423 int const x_range = static_cast<int>(x1) - static_cast<int>(x0);
lewiscameron 0:089b4c4f2b6f 424
lewiscameron 0:089b4c4f2b6f 425 // if dotted line, set step to 2, else step is 1
lewiscameron 0:089b4c4f2b6f 426 unsigned int const step = (type==2) ? 2:1;
lewiscameron 0:089b4c4f2b6f 427
lewiscameron 0:089b4c4f2b6f 428 // make sure we loop over the largest range to get the most pixels on the display
lewiscameron 0:089b4c4f2b6f 429 // for instance, if drawing a vertical line (x_range = 0), we need to loop down the y pixels
lewiscameron 0:089b4c4f2b6f 430 // or else we'll only end up with 1 pixel in the x column
lewiscameron 0:089b4c4f2b6f 431 if ( abs(x_range) > abs(y_range) ) {
lewiscameron 0:089b4c4f2b6f 432
lewiscameron 0:089b4c4f2b6f 433 // ensure we loop from smallest to largest or else for-loop won't run as expected
lewiscameron 0:089b4c4f2b6f 434 unsigned int const start = x_range > 0 ? x0:x1;
lewiscameron 0:089b4c4f2b6f 435 unsigned int const stop = x_range > 0 ? x1:x0;
lewiscameron 0:089b4c4f2b6f 436
lewiscameron 0:089b4c4f2b6f 437 // loop between x pixels
lewiscameron 0:089b4c4f2b6f 438 for (unsigned int x = start; x<= stop ; x+=step) {
lewiscameron 0:089b4c4f2b6f 439 // do linear interpolation
lewiscameron 0:089b4c4f2b6f 440 int const dx = static_cast<int>(x)-static_cast<int>(x0);
lewiscameron 0:089b4c4f2b6f 441 unsigned int const y = y0 + y_range * dx / x_range;
lewiscameron 0:089b4c4f2b6f 442
lewiscameron 0:089b4c4f2b6f 443 // If the line type is '0', this will clear the pixel
lewiscameron 0:089b4c4f2b6f 444 // If it is '1' or '2', the pixel will be set
lewiscameron 0:089b4c4f2b6f 445 setPixel(x,y, type);
lewiscameron 0:089b4c4f2b6f 446 }
lewiscameron 0:089b4c4f2b6f 447 } else {
lewiscameron 0:089b4c4f2b6f 448
lewiscameron 0:089b4c4f2b6f 449 // ensure we loop from smallest to largest or else for-loop won't run as expected
lewiscameron 0:089b4c4f2b6f 450 unsigned int const start = y_range > 0 ? y0:y1;
lewiscameron 0:089b4c4f2b6f 451 unsigned int const stop = y_range > 0 ? y1:y0;
lewiscameron 0:089b4c4f2b6f 452
lewiscameron 0:089b4c4f2b6f 453 for (unsigned int y = start; y<= stop ; y+=step) {
lewiscameron 0:089b4c4f2b6f 454 // do linear interpolation
lewiscameron 0:089b4c4f2b6f 455 int const dy = static_cast<int>(y)-static_cast<int>(y0);
lewiscameron 0:089b4c4f2b6f 456 unsigned int const x = x0 + x_range * dy / y_range;
lewiscameron 0:089b4c4f2b6f 457
lewiscameron 0:089b4c4f2b6f 458 // If the line type is '0', this will clear the pixel
lewiscameron 0:089b4c4f2b6f 459 // If it is '1' or '2', the pixel will be set
lewiscameron 0:089b4c4f2b6f 460 setPixel(x,y, type);
lewiscameron 0:089b4c4f2b6f 461 }
lewiscameron 0:089b4c4f2b6f 462 }
lewiscameron 0:089b4c4f2b6f 463
lewiscameron 0:089b4c4f2b6f 464 }
lewiscameron 0:089b4c4f2b6f 465
lewiscameron 0:089b4c4f2b6f 466 void N5110::drawRect(unsigned int const x0,
lewiscameron 0:089b4c4f2b6f 467 unsigned int const y0,
lewiscameron 0:089b4c4f2b6f 468 unsigned int const width,
lewiscameron 0:089b4c4f2b6f 469 unsigned int const height,
lewiscameron 0:089b4c4f2b6f 470 FillType const fill)
lewiscameron 0:089b4c4f2b6f 471 {
lewiscameron 0:089b4c4f2b6f 472 if (fill == FILL_TRANSPARENT) { // transparent, just outline
lewiscameron 0:089b4c4f2b6f 473 drawLine(x0,y0,x0+(width-1),y0,1); // top
lewiscameron 0:089b4c4f2b6f 474 drawLine(x0,y0+(height-1),x0+(width-1),y0+(height-1),1); // bottom
lewiscameron 0:089b4c4f2b6f 475 drawLine(x0,y0,x0,y0+(height-1),1); // left
lewiscameron 0:089b4c4f2b6f 476 drawLine(x0+(width-1),y0,x0+(width-1),y0+(height-1),1); // right
lewiscameron 0:089b4c4f2b6f 477 } else { // filled rectangle
lewiscameron 0:089b4c4f2b6f 478 int type = (fill==FILL_BLACK) ? 1:0; // black or white fill
lewiscameron 0:089b4c4f2b6f 479 for (int y = y0; y<y0+height; y++) { // loop through rows of rectangle
lewiscameron 0:089b4c4f2b6f 480 drawLine(x0,y,x0+(width-1),y,type); // draw line across screen
lewiscameron 0:089b4c4f2b6f 481 }
lewiscameron 0:089b4c4f2b6f 482 }
lewiscameron 0:089b4c4f2b6f 483 }
lewiscameron 0:089b4c4f2b6f 484
lewiscameron 0:089b4c4f2b6f 485 void N5110::drawSprite(int x0,
lewiscameron 0:089b4c4f2b6f 486 int y0,
lewiscameron 0:089b4c4f2b6f 487 int nrows,
lewiscameron 0:089b4c4f2b6f 488 int ncols,
lewiscameron 0:089b4c4f2b6f 489 int *sprite)
lewiscameron 0:089b4c4f2b6f 490 {
lewiscameron 0:089b4c4f2b6f 491 for (int i = 0; i < nrows; i++) {
lewiscameron 0:089b4c4f2b6f 492 for (int j = 0 ; j < ncols ; j++) {
lewiscameron 0:089b4c4f2b6f 493
lewiscameron 0:089b4c4f2b6f 494 int pixel = *((sprite+i*ncols)+j);
lewiscameron 0:089b4c4f2b6f 495 setPixel(x0+j,y0+i, pixel);
lewiscameron 0:089b4c4f2b6f 496 }
lewiscameron 0:089b4c4f2b6f 497 }
lewiscameron 0:089b4c4f2b6f 498 }