ELEC2645 (2018/19) / Mbed 2 deprecated el17kz

runner

Dependencies:   mbed

N5110/N5110.cpp@0:1e61ade20a23, 2019-05-07 (annotated)

Committer:
kamtas
Date:
Tue May 07 19:09:03 2019 +0000
Revision:
0:1e61ade20a23
Child:
2:1900a4144537
initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kamtas 0:1e61ade20a23 1 #include "mbed.h"
kamtas 0:1e61ade20a23 2 #include "N5110.h"
kamtas 0:1e61ade20a23 3
kamtas 0:1e61ade20a23 4 // overloaded constructor includes power pin - LCD Vcc connected to GPIO pin
kamtas 0:1e61ade20a23 5 // this constructor works fine with LPC1768 - enough current sourced from GPIO
kamtas 0:1e61ade20a23 6 // to power LCD. Doesn't work well with K64F.
kamtas 0:1e61ade20a23 7 N5110::N5110(PinName const pwrPin,
kamtas 0:1e61ade20a23 8 PinName const scePin,
kamtas 0:1e61ade20a23 9 PinName const rstPin,
kamtas 0:1e61ade20a23 10 PinName const dcPin,
kamtas 0:1e61ade20a23 11 PinName const mosiPin,
kamtas 0:1e61ade20a23 12 PinName const sclkPin,
kamtas 0:1e61ade20a23 13 PinName const ledPin)
kamtas 0:1e61ade20a23 14 :
kamtas 0:1e61ade20a23 15 _spi(new SPI(mosiPin,NC,sclkPin)), // create new SPI instance and initialise
kamtas 0:1e61ade20a23 16 _led(new PwmOut(ledPin)),
kamtas 0:1e61ade20a23 17 _pwr(new DigitalOut(pwrPin)),
kamtas 0:1e61ade20a23 18 _sce(new DigitalOut(scePin)),
kamtas 0:1e61ade20a23 19 _rst(new DigitalOut(rstPin)),
kamtas 0:1e61ade20a23 20 _dc(new DigitalOut(dcPin))
kamtas 0:1e61ade20a23 21 {}
kamtas 0:1e61ade20a23 22
kamtas 0:1e61ade20a23 23 // overloaded constructor does not include power pin - LCD Vcc must be tied to +3V3
kamtas 0:1e61ade20a23 24 // Best to use this with K64F as the GPIO hasn't sufficient output current to reliably
kamtas 0:1e61ade20a23 25 // drive the LCD.
kamtas 0:1e61ade20a23 26 N5110::N5110(PinName const scePin,
kamtas 0:1e61ade20a23 27 PinName const rstPin,
kamtas 0:1e61ade20a23 28 PinName const dcPin,
kamtas 0:1e61ade20a23 29 PinName const mosiPin,
kamtas 0:1e61ade20a23 30 PinName const sclkPin,
kamtas 0:1e61ade20a23 31 PinName const ledPin)
kamtas 0:1e61ade20a23 32 :
kamtas 0:1e61ade20a23 33 _spi(new SPI(mosiPin,NC,sclkPin)), // create new SPI instance and initialise
kamtas 0:1e61ade20a23 34 _led(new PwmOut(ledPin)),
kamtas 0:1e61ade20a23 35 _pwr(NULL), // pwr not needed so null it to be safe
kamtas 0:1e61ade20a23 36 _sce(new DigitalOut(scePin)),
kamtas 0:1e61ade20a23 37 _rst(new DigitalOut(rstPin)),
kamtas 0:1e61ade20a23 38 _dc(new DigitalOut(dcPin))
kamtas 0:1e61ade20a23 39 {}
kamtas 0:1e61ade20a23 40
kamtas 0:1e61ade20a23 41 N5110::~N5110()
kamtas 0:1e61ade20a23 42 {
kamtas 0:1e61ade20a23 43 delete _spi;
kamtas 0:1e61ade20a23 44
kamtas 0:1e61ade20a23 45 if(_pwr) {
kamtas 0:1e61ade20a23 46 delete _pwr;
kamtas 0:1e61ade20a23 47 }
kamtas 0:1e61ade20a23 48
kamtas 0:1e61ade20a23 49 delete _led;
kamtas 0:1e61ade20a23 50 delete _sce;
kamtas 0:1e61ade20a23 51 delete _rst;
kamtas 0:1e61ade20a23 52 delete _dc;
kamtas 0:1e61ade20a23 53 }
kamtas 0:1e61ade20a23 54
kamtas 0:1e61ade20a23 55 // initialise function - powers up and sends the initialisation commands
kamtas 0:1e61ade20a23 56 void N5110::init()
kamtas 0:1e61ade20a23 57 {
kamtas 0:1e61ade20a23 58 turnOn(); // power up
kamtas 0:1e61ade20a23 59 reset(); // reset LCD - must be done within 100 ms
kamtas 0:1e61ade20a23 60 initSPI();
kamtas 0:1e61ade20a23 61
kamtas 0:1e61ade20a23 62 setContrast(0.55); // this may need tuning (say 0.4 to 0.6)
kamtas 0:1e61ade20a23 63 setBias(3); // datasheet - 48:1 mux - don't mess with if you don't know what you're doing! (0 to 7)
kamtas 0:1e61ade20a23 64 setTempCoefficient(0); // datasheet - may need increasing (range 0 to 3) at very low temperatures
kamtas 0:1e61ade20a23 65 normalMode(); // normal video mode by default
kamtas 0:1e61ade20a23 66
kamtas 0:1e61ade20a23 67 clearRAM(); // RAM is undefined at power-up so clear to be sure
kamtas 0:1e61ade20a23 68 clear(); // clear buffer
kamtas 0:1e61ade20a23 69 setBrightness(0.5);
kamtas 0:1e61ade20a23 70 }
kamtas 0:1e61ade20a23 71
kamtas 0:1e61ade20a23 72 // sets normal video mode (black on white)
kamtas 0:1e61ade20a23 73 void N5110::normalMode()
kamtas 0:1e61ade20a23 74 {
kamtas 0:1e61ade20a23 75 sendCommand(0b00100000); // basic instruction
kamtas 0:1e61ade20a23 76 sendCommand(0b00001100); // normal video mode- datasheet
kamtas 0:1e61ade20a23 77 }
kamtas 0:1e61ade20a23 78
kamtas 0:1e61ade20a23 79 // sets normal video mode (white on black)
kamtas 0:1e61ade20a23 80 void N5110::inverseMode()
kamtas 0:1e61ade20a23 81 {
kamtas 0:1e61ade20a23 82 sendCommand(0b00100000); // basic instruction
kamtas 0:1e61ade20a23 83 sendCommand(0b00001101); // inverse video mode - datasheet
kamtas 0:1e61ade20a23 84 }
kamtas 0:1e61ade20a23 85
kamtas 0:1e61ade20a23 86 // function to power up the LCD and backlight - only works when using GPIO to power
kamtas 0:1e61ade20a23 87 void N5110::turnOn()
kamtas 0:1e61ade20a23 88 {
kamtas 0:1e61ade20a23 89 if (_pwr != NULL) {
kamtas 0:1e61ade20a23 90 _pwr->write(1); // apply power
kamtas 0:1e61ade20a23 91 }
kamtas 0:1e61ade20a23 92 }
kamtas 0:1e61ade20a23 93
kamtas 0:1e61ade20a23 94 // function to power down LCD
kamtas 0:1e61ade20a23 95 void N5110::turnOff()
kamtas 0:1e61ade20a23 96 {
kamtas 0:1e61ade20a23 97 clear(); // clear buffer
kamtas 0:1e61ade20a23 98 refresh();
kamtas 0:1e61ade20a23 99 setBrightness(0.0); // turn backlight off
kamtas 0:1e61ade20a23 100 clearRAM(); // clear RAM to ensure specified current consumption
kamtas 0:1e61ade20a23 101 // send command to ensure we are in basic mode
kamtas 0:1e61ade20a23 102
kamtas 0:1e61ade20a23 103 sendCommand(0b00100000); // basic mode
kamtas 0:1e61ade20a23 104 sendCommand(0b00001000); // clear display
kamtas 0:1e61ade20a23 105 sendCommand(0b00100001); // extended mode
kamtas 0:1e61ade20a23 106 sendCommand(0b00100100); // power down
kamtas 0:1e61ade20a23 107
kamtas 0:1e61ade20a23 108 // if we are powering the LCD using the GPIO then make it low to turn off
kamtas 0:1e61ade20a23 109 if (_pwr != NULL) {
kamtas 0:1e61ade20a23 110 wait_ms(10); // small delay and then turn off the power pin
kamtas 0:1e61ade20a23 111 _pwr->write(0); // turn off power
kamtas 0:1e61ade20a23 112 }
kamtas 0:1e61ade20a23 113
kamtas 0:1e61ade20a23 114 }
kamtas 0:1e61ade20a23 115
kamtas 0:1e61ade20a23 116 // function to change LED backlight brightness
kamtas 0:1e61ade20a23 117 void N5110::setBrightness(float brightness)
kamtas 0:1e61ade20a23 118 {
kamtas 0:1e61ade20a23 119 // check whether brightness is within range
kamtas 0:1e61ade20a23 120 if (brightness < 0.0f)
kamtas 0:1e61ade20a23 121 brightness = 0.0f;
kamtas 0:1e61ade20a23 122 if (brightness > 1.0f)
kamtas 0:1e61ade20a23 123 brightness = 1.0f;
kamtas 0:1e61ade20a23 124 // set PWM duty cycle
kamtas 0:1e61ade20a23 125 _led->write(brightness);
kamtas 0:1e61ade20a23 126 }
kamtas 0:1e61ade20a23 127
kamtas 0:1e61ade20a23 128 void N5110::setContrast(float contrast) {
kamtas 0:1e61ade20a23 129
kamtas 0:1e61ade20a23 130 // enforce limits
kamtas 0:1e61ade20a23 131 if (contrast > 1.0f)
kamtas 0:1e61ade20a23 132 contrast = 1.0f;
kamtas 0:1e61ade20a23 133 else if (contrast < 0.0f)
kamtas 0:1e61ade20a23 134 contrast = 0.0;
kamtas 0:1e61ade20a23 135
kamtas 0:1e61ade20a23 136 // convert to char in range 0 to 127 (i.e. 6 bits)
kamtas 0:1e61ade20a23 137 char ic = char(contrast*127.0f);
kamtas 0:1e61ade20a23 138
kamtas 0:1e61ade20a23 139 sendCommand(0b00100001); // extended instruction set
kamtas 0:1e61ade20a23 140 sendCommand(0b10000000 | ic); // set Vop (which controls contrast)
kamtas 0:1e61ade20a23 141 sendCommand(0b00100000); // back to basic instruction set
kamtas 0:1e61ade20a23 142 }
kamtas 0:1e61ade20a23 143
kamtas 0:1e61ade20a23 144 void N5110::setTempCoefficient(char tc) {
kamtas 0:1e61ade20a23 145
kamtas 0:1e61ade20a23 146 // enforce limits
kamtas 0:1e61ade20a23 147 if (tc>3) {
kamtas 0:1e61ade20a23 148 tc=3;
kamtas 0:1e61ade20a23 149 }
kamtas 0:1e61ade20a23 150
kamtas 0:1e61ade20a23 151 // temperature coefficient may need increasing at low temperatures
kamtas 0:1e61ade20a23 152
kamtas 0:1e61ade20a23 153 sendCommand(0b00100001); // extended instruction set
kamtas 0:1e61ade20a23 154 sendCommand(0b00000100 | tc);
kamtas 0:1e61ade20a23 155 sendCommand(0b00100000); // back to basic instruction set
kamtas 0:1e61ade20a23 156 }
kamtas 0:1e61ade20a23 157
kamtas 0:1e61ade20a23 158 void N5110::setBias(char bias) {
kamtas 0:1e61ade20a23 159
kamtas 0:1e61ade20a23 160 // from data sheet
kamtas 0:1e61ade20a23 161 // bias mux rate
kamtas 0:1e61ade20a23 162 // 0 1:100
kamtas 0:1e61ade20a23 163 // 1 1:80
kamtas 0:1e61ade20a23 164 // 2 1:65
kamtas 0:1e61ade20a23 165 // 3 1:48 (default)
kamtas 0:1e61ade20a23 166 // 4 1:40/1:34
kamtas 0:1e61ade20a23 167 // 5 1:24
kamtas 0:1e61ade20a23 168 // 6 1:18/1:16
kamtas 0:1e61ade20a23 169 // 7 1:10/1:9/1:8
kamtas 0:1e61ade20a23 170
kamtas 0:1e61ade20a23 171 // enforce limits
kamtas 0:1e61ade20a23 172 if (bias>7) {
kamtas 0:1e61ade20a23 173 bias=7;
kamtas 0:1e61ade20a23 174 }
kamtas 0:1e61ade20a23 175
kamtas 0:1e61ade20a23 176 sendCommand(0b00100001); // extended mode instruction
kamtas 0:1e61ade20a23 177 sendCommand(0b00010000 | bias);
kamtas 0:1e61ade20a23 178 sendCommand(0b00100000); // end of extended mode instruction
kamtas 0:1e61ade20a23 179 }
kamtas 0:1e61ade20a23 180
kamtas 0:1e61ade20a23 181 // pulse the active low reset line
kamtas 0:1e61ade20a23 182 void N5110::reset()
kamtas 0:1e61ade20a23 183 {
kamtas 0:1e61ade20a23 184 _rst->write(0); // reset the LCD
kamtas 0:1e61ade20a23 185 _rst->write(1);
kamtas 0:1e61ade20a23 186 }
kamtas 0:1e61ade20a23 187
kamtas 0:1e61ade20a23 188 // function to initialise SPI peripheral
kamtas 0:1e61ade20a23 189 void N5110::initSPI()
kamtas 0:1e61ade20a23 190 {
kamtas 0:1e61ade20a23 191 _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
kamtas 0:1e61ade20a23 192 _spi->frequency(4000000); // maximum of screen is 4 MHz
kamtas 0:1e61ade20a23 193 }
kamtas 0:1e61ade20a23 194
kamtas 0:1e61ade20a23 195 // send a command to the display
kamtas 0:1e61ade20a23 196 void N5110::sendCommand(unsigned char command)
kamtas 0:1e61ade20a23 197 {
kamtas 0:1e61ade20a23 198 _dc->write(0); // set DC low for command
kamtas 0:1e61ade20a23 199 _sce->write(0); // set CE low to begin frame
kamtas 0:1e61ade20a23 200 _spi->write(command); // send command
kamtas 0:1e61ade20a23 201 _dc->write(1); // turn back to data by default
kamtas 0:1e61ade20a23 202 _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
kamtas 0:1e61ade20a23 203 }
kamtas 0:1e61ade20a23 204
kamtas 0:1e61ade20a23 205 // send data to the display at the current XY address
kamtas 0:1e61ade20a23 206 // dc is set to 1 (i.e. data) after sending a command and so should
kamtas 0:1e61ade20a23 207 // be the default mode.
kamtas 0:1e61ade20a23 208 void N5110::sendData(unsigned char data)
kamtas 0:1e61ade20a23 209 {
kamtas 0:1e61ade20a23 210 _sce->write(0); // set CE low to begin frame
kamtas 0:1e61ade20a23 211 _spi->write(data);
kamtas 0:1e61ade20a23 212 _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
kamtas 0:1e61ade20a23 213 }
kamtas 0:1e61ade20a23 214
kamtas 0:1e61ade20a23 215 // this function writes 0 to the 504 bytes to clear the RAM
kamtas 0:1e61ade20a23 216 void N5110::clearRAM()
kamtas 0:1e61ade20a23 217 {
kamtas 0:1e61ade20a23 218 _sce->write(0); //set CE low to begin frame
kamtas 0:1e61ade20a23 219 for(int i = 0; i < WIDTH * HEIGHT; i++) { // 48 x 84 bits = 504 bytes
kamtas 0:1e61ade20a23 220 _spi->write(0x00); // send 0's
kamtas 0:1e61ade20a23 221 }
kamtas 0:1e61ade20a23 222 _sce->write(1); // set CE high to end frame
kamtas 0:1e61ade20a23 223 }
kamtas 0:1e61ade20a23 224
kamtas 0:1e61ade20a23 225 // function to set the XY address in RAM for subsequenct data write
kamtas 0:1e61ade20a23 226 void N5110::setXYAddress(unsigned int const x,
kamtas 0:1e61ade20a23 227 unsigned int const y)
kamtas 0:1e61ade20a23 228 {
kamtas 0:1e61ade20a23 229 if (x<WIDTH && y<HEIGHT) { // check within range
kamtas 0:1e61ade20a23 230 sendCommand(0b00100000); // basic instruction
kamtas 0:1e61ade20a23 231 sendCommand(0b10000000 | x); // send addresses to display with relevant mask
kamtas 0:1e61ade20a23 232 sendCommand(0b01000000 | y);
kamtas 0:1e61ade20a23 233 }
kamtas 0:1e61ade20a23 234 }
kamtas 0:1e61ade20a23 235
kamtas 0:1e61ade20a23 236 // These functions are used to set, clear and get the value of pixels in the display
kamtas 0:1e61ade20a23 237 // Pixels are addressed in the range of 0 to 47 (y) and 0 to 83 (x). The refresh()
kamtas 0:1e61ade20a23 238 // function must be called after set and clear in order to update the display
kamtas 0:1e61ade20a23 239 void N5110::setPixel(unsigned int const x,
kamtas 0:1e61ade20a23 240 unsigned int const y,
kamtas 0:1e61ade20a23 241 bool const state)
kamtas 0:1e61ade20a23 242 {
kamtas 0:1e61ade20a23 243 if (x<WIDTH && y<HEIGHT) { // check within range
kamtas 0:1e61ade20a23 244 // calculate bank and shift 1 to required position in the data byte
kamtas 0:1e61ade20a23 245 if(state) buffer[x][y/8] |= (1 << y%8);
kamtas 0:1e61ade20a23 246 else buffer[x][y/8] &= ~(1 << y%8);
kamtas 0:1e61ade20a23 247 }
kamtas 0:1e61ade20a23 248 }
kamtas 0:1e61ade20a23 249
kamtas 0:1e61ade20a23 250 void N5110::clearPixel(unsigned int const x,
kamtas 0:1e61ade20a23 251 unsigned int const y)
kamtas 0:1e61ade20a23 252 {
kamtas 0:1e61ade20a23 253 if (x<WIDTH && y<HEIGHT) { // check within range
kamtas 0:1e61ade20a23 254 // calculate bank and shift 1 to required position (using bit clear)
kamtas 0:1e61ade20a23 255 buffer[x][y/8] &= ~(1 << y%8);
kamtas 0:1e61ade20a23 256 }
kamtas 0:1e61ade20a23 257 }
kamtas 0:1e61ade20a23 258
kamtas 0:1e61ade20a23 259 int N5110::getPixel(unsigned int const x,
kamtas 0:1e61ade20a23 260 unsigned int const y) const
kamtas 0:1e61ade20a23 261 {
kamtas 0:1e61ade20a23 262 if (x<WIDTH && y<HEIGHT) { // check within range
kamtas 0:1e61ade20a23 263 // return relevant bank and mask required bit
kamtas 0:1e61ade20a23 264
kamtas 0:1e61ade20a23 265 int pixel = (int) buffer[x][y/8] & (1 << y%8);
kamtas 0:1e61ade20a23 266
kamtas 0:1e61ade20a23 267 if (pixel)
kamtas 0:1e61ade20a23 268 return 1;
kamtas 0:1e61ade20a23 269 else
kamtas 0:1e61ade20a23 270 return 0;
kamtas 0:1e61ade20a23 271 }
kamtas 0:1e61ade20a23 272
kamtas 0:1e61ade20a23 273 return 0;
kamtas 0:1e61ade20a23 274
kamtas 0:1e61ade20a23 275 }
kamtas 0:1e61ade20a23 276
kamtas 0:1e61ade20a23 277 // function to refresh the display
kamtas 0:1e61ade20a23 278 void N5110::refresh()
kamtas 0:1e61ade20a23 279 {
kamtas 0:1e61ade20a23 280 setXYAddress(0,0); // important to set address back to 0,0 before refreshing display
kamtas 0:1e61ade20a23 281 // address auto increments after printing string, so buffer[0][0] will not coincide
kamtas 0:1e61ade20a23 282 // with top-left pixel after priting string
kamtas 0:1e61ade20a23 283
kamtas 0:1e61ade20a23 284 _sce->write(0); //set CE low to begin frame
kamtas 0:1e61ade20a23 285
kamtas 0:1e61ade20a23 286 for(int j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
kamtas 0:1e61ade20a23 287 for(int i = 0; i < WIDTH; i++) {
kamtas 0:1e61ade20a23 288 _spi->write(buffer[i][j]); // send buffer
kamtas 0:1e61ade20a23 289 }
kamtas 0:1e61ade20a23 290 }
kamtas 0:1e61ade20a23 291 _sce->write(1); // set CE high to end frame
kamtas 0:1e61ade20a23 292
kamtas 0:1e61ade20a23 293 }
kamtas 0:1e61ade20a23 294
kamtas 0:1e61ade20a23 295 // fills the buffer with random bytes. Can be used to test the display.
kamtas 0:1e61ade20a23 296 // The rand() function isn't seeded so it probably creates the same pattern everytime
kamtas 0:1e61ade20a23 297 void N5110::randomiseBuffer()
kamtas 0:1e61ade20a23 298 {
kamtas 0:1e61ade20a23 299 int i,j;
kamtas 0:1e61ade20a23 300 for(j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
kamtas 0:1e61ade20a23 301 for(i = 0; i < WIDTH; i++) {
kamtas 0:1e61ade20a23 302 buffer[i][j] = rand()%256; // generate random byte
kamtas 0:1e61ade20a23 303 }
kamtas 0:1e61ade20a23 304 }
kamtas 0:1e61ade20a23 305
kamtas 0:1e61ade20a23 306 }
kamtas 0:1e61ade20a23 307
kamtas 0:1e61ade20a23 308 // function to print 5x7 font
kamtas 0:1e61ade20a23 309 void N5110::printChar(char const c,
kamtas 0:1e61ade20a23 310 unsigned int const x,
kamtas 0:1e61ade20a23 311 unsigned int const y)
kamtas 0:1e61ade20a23 312 {
kamtas 0:1e61ade20a23 313 if (y<BANKS) { // check if printing in range of y banks
kamtas 0:1e61ade20a23 314
kamtas 0:1e61ade20a23 315 for (int i = 0; i < 5 ; i++ ) {
kamtas 0:1e61ade20a23 316 int pixel_x = x+i;
kamtas 0:1e61ade20a23 317 if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83)
kamtas 0:1e61ade20a23 318 break;
kamtas 0:1e61ade20a23 319 buffer[pixel_x][y] = font5x7[(c - 32)*5 + i];
kamtas 0:1e61ade20a23 320 // array is offset by 32 relative to ASCII, each character is 5 pixels wide
kamtas 0:1e61ade20a23 321 }
kamtas 0:1e61ade20a23 322
kamtas 0:1e61ade20a23 323 }
kamtas 0:1e61ade20a23 324 }
kamtas 0:1e61ade20a23 325
kamtas 0:1e61ade20a23 326 // function to print string at specified position
kamtas 0:1e61ade20a23 327 void N5110::printString(const char *str,
kamtas 0:1e61ade20a23 328 unsigned int const x,
kamtas 0:1e61ade20a23 329 unsigned int const y)
kamtas 0:1e61ade20a23 330 {
kamtas 0:1e61ade20a23 331 if (y<BANKS) { // check if printing in range of y banks
kamtas 0:1e61ade20a23 332
kamtas 0:1e61ade20a23 333 int n = 0 ; // counter for number of characters in string
kamtas 0:1e61ade20a23 334 // loop through string and print character
kamtas 0:1e61ade20a23 335 while(*str) {
kamtas 0:1e61ade20a23 336
kamtas 0:1e61ade20a23 337 // writes the character bitmap data to the buffer, so that
kamtas 0:1e61ade20a23 338 // text and pixels can be displayed at the same time
kamtas 0:1e61ade20a23 339 for (int i = 0; i < 5 ; i++ ) {
kamtas 0:1e61ade20a23 340 int pixel_x = x+i+n*6;
kamtas 0:1e61ade20a23 341 if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83)
kamtas 0:1e61ade20a23 342 break;
kamtas 0:1e61ade20a23 343 buffer[pixel_x][y] = font5x7[(*str - 32)*5 + i];
kamtas 0:1e61ade20a23 344 }
kamtas 0:1e61ade20a23 345 str++; // go to next character in string
kamtas 0:1e61ade20a23 346 n++; // increment index
kamtas 0:1e61ade20a23 347 }
kamtas 0:1e61ade20a23 348 }
kamtas 0:1e61ade20a23 349 }
kamtas 0:1e61ade20a23 350
kamtas 0:1e61ade20a23 351 // function to clear the screen buffer
kamtas 0:1e61ade20a23 352 void N5110::clear()
kamtas 0:1e61ade20a23 353 {
kamtas 0:1e61ade20a23 354 memset(buffer,0,sizeof(buffer));
kamtas 0:1e61ade20a23 355 }
kamtas 0:1e61ade20a23 356
kamtas 0:1e61ade20a23 357 // function to plot array on display
kamtas 0:1e61ade20a23 358 void N5110::plotArray(float const array[])
kamtas 0:1e61ade20a23 359 {
kamtas 0:1e61ade20a23 360 for (int i=0; i<WIDTH; i++) { // loop through array
kamtas 0:1e61ade20a23 361 // elements are normalised from 0.0 to 1.0, so multiply
kamtas 0:1e61ade20a23 362 // by 47 to convert to pixel range, and subtract from 47
kamtas 0:1e61ade20a23 363 // since top-left is 0,0 in the display geometry
kamtas 0:1e61ade20a23 364 setPixel(i,47 - int(array[i]*47.0f),true);
kamtas 0:1e61ade20a23 365 }
kamtas 0:1e61ade20a23 366
kamtas 0:1e61ade20a23 367 }
kamtas 0:1e61ade20a23 368
kamtas 0:1e61ade20a23 369 // function to draw circle
kamtas 0:1e61ade20a23 370 void N5110:: drawCircle(unsigned int const x0,
kamtas 0:1e61ade20a23 371 unsigned int const y0,
kamtas 0:1e61ade20a23 372 unsigned int const radius,
kamtas 0:1e61ade20a23 373 FillType const fill)
kamtas 0:1e61ade20a23 374 {
kamtas 0:1e61ade20a23 375 // from http://en.wikipedia.org/wiki/Midpoint_circle_algorithm
kamtas 0:1e61ade20a23 376 int x = radius;
kamtas 0:1e61ade20a23 377 int y = 0;
kamtas 0:1e61ade20a23 378 int radiusError = 1-x;
kamtas 0:1e61ade20a23 379
kamtas 0:1e61ade20a23 380 while(x >= y) {
kamtas 0:1e61ade20a23 381
kamtas 0:1e61ade20a23 382 // if transparent, just draw outline
kamtas 0:1e61ade20a23 383 if (fill == FILL_TRANSPARENT) {
kamtas 0:1e61ade20a23 384 setPixel( x + x0, y + y0,true);
kamtas 0:1e61ade20a23 385 setPixel(-x + x0, y + y0,true);
kamtas 0:1e61ade20a23 386 setPixel( y + x0, x + y0,true);
kamtas 0:1e61ade20a23 387 setPixel(-y + x0, x + y0,true);
kamtas 0:1e61ade20a23 388 setPixel(-y + x0, -x + y0,true);
kamtas 0:1e61ade20a23 389 setPixel( y + x0, -x + y0,true);
kamtas 0:1e61ade20a23 390 setPixel( x + x0, -y + y0,true);
kamtas 0:1e61ade20a23 391 setPixel(-x + x0, -y + y0,true);
kamtas 0:1e61ade20a23 392 } else { // drawing filled circle, so draw lines between points at same y value
kamtas 0:1e61ade20a23 393
kamtas 0:1e61ade20a23 394 int type = (fill==FILL_BLACK) ? 1:0; // black or white fill
kamtas 0:1e61ade20a23 395
kamtas 0:1e61ade20a23 396 drawLine(x+x0,y+y0,-x+x0,y+y0,type);
kamtas 0:1e61ade20a23 397 drawLine(y+x0,x+y0,-y+x0,x+y0,type);
kamtas 0:1e61ade20a23 398 drawLine(y+x0,-x+y0,-y+x0,-x+y0,type);
kamtas 0:1e61ade20a23 399 drawLine(x+x0,-y+y0,-x+x0,-y+y0,type);
kamtas 0:1e61ade20a23 400 }
kamtas 0:1e61ade20a23 401
kamtas 0:1e61ade20a23 402 y++;
kamtas 0:1e61ade20a23 403 if (radiusError<0) {
kamtas 0:1e61ade20a23 404 radiusError += 2 * y + 1;
kamtas 0:1e61ade20a23 405 } else {
kamtas 0:1e61ade20a23 406 x--;
kamtas 0:1e61ade20a23 407 radiusError += 2 * (y - x) + 1;
kamtas 0:1e61ade20a23 408 }
kamtas 0:1e61ade20a23 409 }
kamtas 0:1e61ade20a23 410
kamtas 0:1e61ade20a23 411 }
kamtas 0:1e61ade20a23 412
kamtas 0:1e61ade20a23 413 void N5110::drawLine(unsigned int const x0,
kamtas 0:1e61ade20a23 414 unsigned int const y0,
kamtas 0:1e61ade20a23 415 unsigned int const x1,
kamtas 0:1e61ade20a23 416 unsigned int const y1,
kamtas 0:1e61ade20a23 417 unsigned int const type)
kamtas 0:1e61ade20a23 418 {
kamtas 0:1e61ade20a23 419 // Note that the ranges can be negative so we have to turn the input values
kamtas 0:1e61ade20a23 420 // into signed integers first
kamtas 0:1e61ade20a23 421 int const y_range = static_cast<int>(y1) - static_cast<int>(y0);
kamtas 0:1e61ade20a23 422 int const x_range = static_cast<int>(x1) - static_cast<int>(x0);
kamtas 0:1e61ade20a23 423
kamtas 0:1e61ade20a23 424 // if dotted line, set step to 2, else step is 1
kamtas 0:1e61ade20a23 425 unsigned int const step = (type==2) ? 2:1;
kamtas 0:1e61ade20a23 426
kamtas 0:1e61ade20a23 427 // make sure we loop over the largest range to get the most pixels on the display
kamtas 0:1e61ade20a23 428 // for instance, if drawing a vertical line (x_range = 0), we need to loop down the y pixels
kamtas 0:1e61ade20a23 429 // or else we'll only end up with 1 pixel in the x column
kamtas 0:1e61ade20a23 430 if ( abs(x_range) > abs(y_range) ) {
kamtas 0:1e61ade20a23 431
kamtas 0:1e61ade20a23 432 // ensure we loop from smallest to largest or else for-loop won't run as expected
kamtas 0:1e61ade20a23 433 unsigned int const start = x_range > 0 ? x0:x1;
kamtas 0:1e61ade20a23 434 unsigned int const stop = x_range > 0 ? x1:x0;
kamtas 0:1e61ade20a23 435
kamtas 0:1e61ade20a23 436 // loop between x pixels
kamtas 0:1e61ade20a23 437 for (unsigned int x = start; x<= stop ; x+=step) {
kamtas 0:1e61ade20a23 438 // do linear interpolation
kamtas 0:1e61ade20a23 439 int const dx = static_cast<int>(x)-static_cast<int>(x0);
kamtas 0:1e61ade20a23 440 unsigned int const y = y0 + y_range * dx / x_range;
kamtas 0:1e61ade20a23 441
kamtas 0:1e61ade20a23 442 // If the line type is '0', this will clear the pixel
kamtas 0:1e61ade20a23 443 // If it is '1' or '2', the pixel will be set
kamtas 0:1e61ade20a23 444 setPixel(x,y, type);
kamtas 0:1e61ade20a23 445 }
kamtas 0:1e61ade20a23 446 } else {
kamtas 0:1e61ade20a23 447
kamtas 0:1e61ade20a23 448 // ensure we loop from smallest to largest or else for-loop won't run as expected
kamtas 0:1e61ade20a23 449 unsigned int const start = y_range > 0 ? y0:y1;
kamtas 0:1e61ade20a23 450 unsigned int const stop = y_range > 0 ? y1:y0;
kamtas 0:1e61ade20a23 451
kamtas 0:1e61ade20a23 452 for (unsigned int y = start; y<= stop ; y+=step) {
kamtas 0:1e61ade20a23 453 // do linear interpolation
kamtas 0:1e61ade20a23 454 int const dy = static_cast<int>(y)-static_cast<int>(y0);
kamtas 0:1e61ade20a23 455 unsigned int const x = x0 + x_range * dy / y_range;
kamtas 0:1e61ade20a23 456
kamtas 0:1e61ade20a23 457 // If the line type is '0', this will clear the pixel
kamtas 0:1e61ade20a23 458 // If it is '1' or '2', the pixel will be set
kamtas 0:1e61ade20a23 459 setPixel(x,y, type);
kamtas 0:1e61ade20a23 460 }
kamtas 0:1e61ade20a23 461 }
kamtas 0:1e61ade20a23 462
kamtas 0:1e61ade20a23 463 }
kamtas 0:1e61ade20a23 464
kamtas 0:1e61ade20a23 465 void N5110::drawRect(unsigned int const x0,
kamtas 0:1e61ade20a23 466 unsigned int const y0,
kamtas 0:1e61ade20a23 467 unsigned int const width,
kamtas 0:1e61ade20a23 468 unsigned int const height,
kamtas 0:1e61ade20a23 469 FillType const fill)
kamtas 0:1e61ade20a23 470 {
kamtas 0:1e61ade20a23 471 if (fill == FILL_TRANSPARENT) { // transparent, just outline
kamtas 0:1e61ade20a23 472 drawLine(x0,y0,x0+(width-1),y0,1); // top
kamtas 0:1e61ade20a23 473 drawLine(x0,y0+(height-1),x0+(width-1),y0+(height-1),1); // bottom
kamtas 0:1e61ade20a23 474 drawLine(x0,y0,x0,y0+(height-1),1); // left
kamtas 0:1e61ade20a23 475 drawLine(x0+(width-1),y0,x0+(width-1),y0+(height-1),1); // right
kamtas 0:1e61ade20a23 476 } else { // filled rectangle
kamtas 0:1e61ade20a23 477 int type = (fill==FILL_BLACK) ? 1:0; // black or white fill
kamtas 0:1e61ade20a23 478 for (int y = y0; y<y0+height; y++) { // loop through rows of rectangle
kamtas 0:1e61ade20a23 479 drawLine(x0,y,x0+(width-1),y,type); // draw line across screen
kamtas 0:1e61ade20a23 480 }
kamtas 0:1e61ade20a23 481 }
kamtas 0:1e61ade20a23 482 }
kamtas 0:1e61ade20a23 483
kamtas 0:1e61ade20a23 484 void N5110::drawSprite(int x0,
kamtas 0:1e61ade20a23 485 int y0,
kamtas 0:1e61ade20a23 486 int nrows,
kamtas 0:1e61ade20a23 487 int ncols,
kamtas 0:1e61ade20a23 488 int *sprite)
kamtas 0:1e61ade20a23 489 {
kamtas 0:1e61ade20a23 490 for (int i = 0; i < nrows; i++) {
kamtas 0:1e61ade20a23 491 for (int j = 0 ; j < ncols ; j++) {
kamtas 0:1e61ade20a23 492
kamtas 0:1e61ade20a23 493 int pixel = *((sprite+i*ncols)+j);
kamtas 0:1e61ade20a23 494 setPixel(x0+j,y0+i, pixel);
kamtas 0:1e61ade20a23 495 }
kamtas 0:1e61ade20a23 496 }
kamtas 0:1e61ade20a23 497 }