XJEL2645 (19/20) / Mbed 2 deprecated el17hy

Yang Hongxiao 201199678

Dependencies:   mbed

N5110/N5110.cpp@1:a6ead8050c23, 2020-05-14 (annotated)

Committer:
YHX
Date:
Thu May 14 17:00:34 2020 +0000
Revision:
1:a6ead8050c23
Parent:
0:4b02786450c0 
Yang Hongxiao; el17hy; 201199678

Who changed what in which revision?

UserRevisionLine numberNew contents of line
YHX 0:4b02786450c0 1 #include "mbed.h"
YHX 0:4b02786450c0 2 #include "N5110.h"
YHX 0:4b02786450c0 3
YHX 0:4b02786450c0 4 // overloaded constructor includes power pin - LCD Vcc connected to GPIO pin
YHX 0:4b02786450c0 5 // this constructor works fine with LPC1768 - enough current sourced from GPIO
YHX 0:4b02786450c0 6 // to power LCD. Doesn't work well with K64F.
YHX 0:4b02786450c0 7 N5110::N5110(PinName const pwrPin,
YHX 0:4b02786450c0 8 PinName const scePin,
YHX 0:4b02786450c0 9 PinName const rstPin,
YHX 0:4b02786450c0 10 PinName const dcPin,
YHX 0:4b02786450c0 11 PinName const mosiPin,
YHX 0:4b02786450c0 12 PinName const sclkPin,
YHX 0:4b02786450c0 13 PinName const ledPin)
YHX 0:4b02786450c0 14 :
YHX 0:4b02786450c0 15 _spi(new SPI(mosiPin,NC,sclkPin)), // create new SPI instance and initialise
YHX 0:4b02786450c0 16 _led(new PwmOut(ledPin)),
YHX 0:4b02786450c0 17 _pwr(new DigitalOut(pwrPin)),
YHX 0:4b02786450c0 18 _sce(new DigitalOut(scePin)),
YHX 0:4b02786450c0 19 _rst(new DigitalOut(rstPin)),
YHX 0:4b02786450c0 20 _dc(new DigitalOut(dcPin))
YHX 0:4b02786450c0 21 {}
YHX 0:4b02786450c0 22
YHX 0:4b02786450c0 23 // overloaded constructor does not include power pin - LCD Vcc must be tied to +3V3
YHX 0:4b02786450c0 24 // Best to use this with K64F as the GPIO hasn't sufficient output current to reliably
YHX 0:4b02786450c0 25 // drive the LCD.
YHX 0:4b02786450c0 26 N5110::N5110(PinName const scePin,
YHX 0:4b02786450c0 27 PinName const rstPin,
YHX 0:4b02786450c0 28 PinName const dcPin,
YHX 0:4b02786450c0 29 PinName const mosiPin,
YHX 0:4b02786450c0 30 PinName const sclkPin,
YHX 0:4b02786450c0 31 PinName const ledPin)
YHX 0:4b02786450c0 32 :
YHX 0:4b02786450c0 33 _spi(new SPI(mosiPin,NC,sclkPin)), // create new SPI instance and initialise
YHX 0:4b02786450c0 34 _led(new PwmOut(ledPin)),
YHX 0:4b02786450c0 35 _pwr(NULL), // pwr not needed so null it to be safe
YHX 0:4b02786450c0 36 _sce(new DigitalOut(scePin)),
YHX 0:4b02786450c0 37 _rst(new DigitalOut(rstPin)),
YHX 0:4b02786450c0 38 _dc(new DigitalOut(dcPin))
YHX 0:4b02786450c0 39 {}
YHX 0:4b02786450c0 40
YHX 0:4b02786450c0 41 N5110::~N5110()
YHX 0:4b02786450c0 42 {
YHX 0:4b02786450c0 43 delete _spi;
YHX 0:4b02786450c0 44
YHX 0:4b02786450c0 45 if(_pwr) {
YHX 0:4b02786450c0 46 delete _pwr;
YHX 0:4b02786450c0 47 }
YHX 0:4b02786450c0 48
YHX 0:4b02786450c0 49 delete _led;
YHX 0:4b02786450c0 50 delete _sce;
YHX 0:4b02786450c0 51 delete _rst;
YHX 0:4b02786450c0 52 delete _dc;
YHX 0:4b02786450c0 53 }
YHX 0:4b02786450c0 54
YHX 0:4b02786450c0 55 // initialise function - powers up and sends the initialisation commands
YHX 0:4b02786450c0 56 void N5110::init()
YHX 0:4b02786450c0 57 {
YHX 0:4b02786450c0 58 turnOn(); // power up
YHX 0:4b02786450c0 59 reset(); // reset LCD - must be done within 100 ms
YHX 0:4b02786450c0 60 initSPI();
YHX 0:4b02786450c0 61
YHX 0:4b02786450c0 62 setContrast(0.55); // this may need tuning (say 0.4 to 0.6)
YHX 0:4b02786450c0 63 setBias(3); // datasheet - 48:1 mux - don't mess with if you don't know what you're doing! (0 to 7)
YHX 0:4b02786450c0 64 setTempCoefficient(0); // datasheet - may need increasing (range 0 to 3) at very low temperatures
YHX 0:4b02786450c0 65 normalMode(); // normal video mode by default
YHX 0:4b02786450c0 66
YHX 0:4b02786450c0 67 clearRAM(); // RAM is undefined at power-up so clear to be sure
YHX 0:4b02786450c0 68 clear(); // clear buffer
YHX 0:4b02786450c0 69 setBrightness(0.5);
YHX 0:4b02786450c0 70 }
YHX 0:4b02786450c0 71
YHX 0:4b02786450c0 72 // sets normal video mode (black on white)
YHX 0:4b02786450c0 73 void N5110::normalMode()
YHX 0:4b02786450c0 74 {
YHX 0:4b02786450c0 75 sendCommand(0b00100000); // basic instruction
YHX 0:4b02786450c0 76 sendCommand(0b00001100); // normal video mode- datasheet
YHX 0:4b02786450c0 77 }
YHX 0:4b02786450c0 78
YHX 0:4b02786450c0 79 // sets normal video mode (white on black)
YHX 0:4b02786450c0 80 void N5110::inverseMode()
YHX 0:4b02786450c0 81 {
YHX 0:4b02786450c0 82 sendCommand(0b00100000); // basic instruction
YHX 0:4b02786450c0 83 sendCommand(0b00001101); // inverse video mode - datasheet
YHX 0:4b02786450c0 84 }
YHX 0:4b02786450c0 85
YHX 0:4b02786450c0 86 // function to power up the LCD and backlight - only works when using GPIO to power
YHX 0:4b02786450c0 87 void N5110::turnOn()
YHX 0:4b02786450c0 88 {
YHX 0:4b02786450c0 89 if (_pwr != NULL) {
YHX 0:4b02786450c0 90 _pwr->write(1); // apply power
YHX 0:4b02786450c0 91 }
YHX 0:4b02786450c0 92 }
YHX 0:4b02786450c0 93
YHX 0:4b02786450c0 94 // function to power down LCD
YHX 0:4b02786450c0 95 void N5110::turnOff()
YHX 0:4b02786450c0 96 {
YHX 0:4b02786450c0 97 clear(); // clear buffer
YHX 0:4b02786450c0 98 refresh();
YHX 0:4b02786450c0 99 setBrightness(0.0); // turn backlight off
YHX 0:4b02786450c0 100 clearRAM(); // clear RAM to ensure specified current consumption
YHX 0:4b02786450c0 101 // send command to ensure we are in basic mode
YHX 0:4b02786450c0 102
YHX 0:4b02786450c0 103 sendCommand(0b00100000); // basic mode
YHX 0:4b02786450c0 104 sendCommand(0b00001000); // clear display
YHX 0:4b02786450c0 105 sendCommand(0b00100001); // extended mode
YHX 0:4b02786450c0 106 sendCommand(0b00100100); // power down
YHX 0:4b02786450c0 107
YHX 0:4b02786450c0 108 // if we are powering the LCD using the GPIO then make it low to turn off
YHX 0:4b02786450c0 109 if (_pwr != NULL) {
YHX 0:4b02786450c0 110 wait_ms(10); // small delay and then turn off the power pin
YHX 0:4b02786450c0 111 _pwr->write(0); // turn off power
YHX 0:4b02786450c0 112 }
YHX 0:4b02786450c0 113
YHX 0:4b02786450c0 114 }
YHX 0:4b02786450c0 115
YHX 0:4b02786450c0 116 // function to change LED backlight brightness
YHX 0:4b02786450c0 117 void N5110::setBrightness(float brightness)
YHX 0:4b02786450c0 118 {
YHX 0:4b02786450c0 119 // check whether brightness is within range
YHX 0:4b02786450c0 120 if (brightness < 0.0f)
YHX 0:4b02786450c0 121 brightness = 0.0f;
YHX 0:4b02786450c0 122 if (brightness > 1.0f)
YHX 0:4b02786450c0 123 brightness = 1.0f;
YHX 0:4b02786450c0 124 // set PWM duty cycle
YHX 0:4b02786450c0 125 _led->write(brightness);
YHX 0:4b02786450c0 126 }
YHX 0:4b02786450c0 127
YHX 0:4b02786450c0 128 void N5110::setContrast(float contrast) {
YHX 0:4b02786450c0 129
YHX 0:4b02786450c0 130 // enforce limits
YHX 0:4b02786450c0 131 if (contrast > 1.0f)
YHX 0:4b02786450c0 132 contrast = 1.0f;
YHX 0:4b02786450c0 133 else if (contrast < 0.0f)
YHX 0:4b02786450c0 134 contrast = 0.0;
YHX 0:4b02786450c0 135
YHX 0:4b02786450c0 136 // convert to char in range 0 to 127 (i.e. 6 bits)
YHX 0:4b02786450c0 137 char ic = char(contrast*127.0f);
YHX 0:4b02786450c0 138
YHX 0:4b02786450c0 139 sendCommand(0b00100001); // extended instruction set
YHX 0:4b02786450c0 140 sendCommand(0b10000000 | ic); // set Vop (which controls contrast)
YHX 0:4b02786450c0 141 sendCommand(0b00100000); // back to basic instruction set
YHX 0:4b02786450c0 142 }
YHX 0:4b02786450c0 143
YHX 0:4b02786450c0 144 void N5110::setTempCoefficient(char tc) {
YHX 0:4b02786450c0 145
YHX 0:4b02786450c0 146 // enforce limits
YHX 0:4b02786450c0 147 if (tc>3) {
YHX 0:4b02786450c0 148 tc=3;
YHX 0:4b02786450c0 149 }
YHX 0:4b02786450c0 150
YHX 0:4b02786450c0 151 // temperature coefficient may need increasing at low temperatures
YHX 0:4b02786450c0 152
YHX 0:4b02786450c0 153 sendCommand(0b00100001); // extended instruction set
YHX 0:4b02786450c0 154 sendCommand(0b00000100 | tc);
YHX 0:4b02786450c0 155 sendCommand(0b00100000); // back to basic instruction set
YHX 0:4b02786450c0 156 }
YHX 0:4b02786450c0 157
YHX 0:4b02786450c0 158 void N5110::setBias(char bias) {
YHX 0:4b02786450c0 159
YHX 0:4b02786450c0 160 // from data sheet
YHX 0:4b02786450c0 161 // bias mux rate
YHX 0:4b02786450c0 162 // 0 1:100
YHX 0:4b02786450c0 163 // 1 1:80
YHX 0:4b02786450c0 164 // 2 1:65
YHX 0:4b02786450c0 165 // 3 1:48 (default)
YHX 0:4b02786450c0 166 // 4 1:40/1:34
YHX 0:4b02786450c0 167 // 5 1:24
YHX 0:4b02786450c0 168 // 6 1:18/1:16
YHX 0:4b02786450c0 169 // 7 1:10/1:9/1:8
YHX 0:4b02786450c0 170
YHX 0:4b02786450c0 171 // enforce limits
YHX 0:4b02786450c0 172 if (bias>7) {
YHX 0:4b02786450c0 173 bias=7;
YHX 0:4b02786450c0 174 }
YHX 0:4b02786450c0 175
YHX 0:4b02786450c0 176 sendCommand(0b00100001); // extended mode instruction
YHX 0:4b02786450c0 177 sendCommand(0b00010000 | bias);
YHX 0:4b02786450c0 178 sendCommand(0b00100000); // end of extended mode instruction
YHX 0:4b02786450c0 179 }
YHX 0:4b02786450c0 180
YHX 0:4b02786450c0 181 // pulse the active low reset line
YHX 0:4b02786450c0 182 void N5110::reset()
YHX 0:4b02786450c0 183 {
YHX 0:4b02786450c0 184 _rst->write(0); // reset the LCD
YHX 0:4b02786450c0 185 _rst->write(1);
YHX 0:4b02786450c0 186 }
YHX 0:4b02786450c0 187
YHX 0:4b02786450c0 188 // function to initialise SPI peripheral
YHX 0:4b02786450c0 189 void N5110::initSPI()
YHX 0:4b02786450c0 190 {
YHX 0:4b02786450c0 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
YHX 0:4b02786450c0 192 _spi->frequency(4000000); // maximum of screen is 4 MHz
YHX 0:4b02786450c0 193 }
YHX 0:4b02786450c0 194
YHX 0:4b02786450c0 195 // send a command to the display
YHX 0:4b02786450c0 196 void N5110::sendCommand(unsigned char command)
YHX 0:4b02786450c0 197 {
YHX 0:4b02786450c0 198 _dc->write(0); // set DC low for command
YHX 0:4b02786450c0 199 _sce->write(0); // set CE low to begin frame
YHX 0:4b02786450c0 200 _spi->write(command); // send command
YHX 0:4b02786450c0 201 _dc->write(1); // turn back to data by default
YHX 0:4b02786450c0 202 _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
YHX 0:4b02786450c0 203 }
YHX 0:4b02786450c0 204
YHX 0:4b02786450c0 205 // send data to the display at the current XY address
YHX 0:4b02786450c0 206 // dc is set to 1 (i.e. data) after sending a command and so should
YHX 0:4b02786450c0 207 // be the default mode.
YHX 0:4b02786450c0 208 void N5110::sendData(unsigned char data)
YHX 0:4b02786450c0 209 {
YHX 0:4b02786450c0 210 _sce->write(0); // set CE low to begin frame
YHX 0:4b02786450c0 211 _spi->write(data);
YHX 0:4b02786450c0 212 _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
YHX 0:4b02786450c0 213 }
YHX 0:4b02786450c0 214
YHX 0:4b02786450c0 215 // this function writes 0 to the 504 bytes to clear the RAM
YHX 0:4b02786450c0 216 void N5110::clearRAM()
YHX 0:4b02786450c0 217 {
YHX 0:4b02786450c0 218 _sce->write(0); //set CE low to begin frame
YHX 0:4b02786450c0 219 for(int i = 0; i < WIDTH * HEIGHT; i++) { // 48 x 84 bits = 504 bytes
YHX 0:4b02786450c0 220 _spi->write(0x00); // send 0's
YHX 0:4b02786450c0 221 }
YHX 0:4b02786450c0 222 _sce->write(1); // set CE high to end frame
YHX 0:4b02786450c0 223 }
YHX 0:4b02786450c0 224
YHX 0:4b02786450c0 225 // function to set the XY address in RAM for subsequenct data write
YHX 0:4b02786450c0 226 void N5110::setXYAddress(unsigned int const x,
YHX 0:4b02786450c0 227 unsigned int const y)
YHX 0:4b02786450c0 228 {
YHX 0:4b02786450c0 229 if (x<WIDTH && y<HEIGHT) { // check within range
YHX 0:4b02786450c0 230 sendCommand(0b00100000); // basic instruction
YHX 0:4b02786450c0 231 sendCommand(0b10000000 | x); // send addresses to display with relevant mask
YHX 0:4b02786450c0 232 sendCommand(0b01000000 | y);
YHX 0:4b02786450c0 233 }
YHX 0:4b02786450c0 234 }
YHX 0:4b02786450c0 235
YHX 0:4b02786450c0 236 // These functions are used to set, clear and get the value of pixels in the display
YHX 0:4b02786450c0 237 // Pixels are addressed in the range of 0 to 47 (y) and 0 to 83 (x). The refresh()
YHX 0:4b02786450c0 238 // function must be called after set and clear in order to update the display
YHX 0:4b02786450c0 239 void N5110::setPixel(unsigned int const x,
YHX 0:4b02786450c0 240 unsigned int const y,
YHX 0:4b02786450c0 241 bool const state)
YHX 0:4b02786450c0 242 {
YHX 0:4b02786450c0 243 if (x<WIDTH && y<HEIGHT) { // check within range
YHX 0:4b02786450c0 244 // calculate bank and shift 1 to required position in the data byte
YHX 0:4b02786450c0 245 if(state) buffer[x][y/8] |= (1 << y%8);
YHX 0:4b02786450c0 246 else buffer[x][y/8] &= ~(1 << y%8);
YHX 0:4b02786450c0 247 }
YHX 0:4b02786450c0 248 }
YHX 0:4b02786450c0 249
YHX 0:4b02786450c0 250 void N5110::clearPixel(unsigned int const x,
YHX 0:4b02786450c0 251 unsigned int const y)
YHX 0:4b02786450c0 252 {
YHX 0:4b02786450c0 253 if (x<WIDTH && y<HEIGHT) { // check within range
YHX 0:4b02786450c0 254 // calculate bank and shift 1 to required position (using bit clear)
YHX 0:4b02786450c0 255 buffer[x][y/8] &= ~(1 << y%8);
YHX 0:4b02786450c0 256 }
YHX 0:4b02786450c0 257 }
YHX 0:4b02786450c0 258
YHX 0:4b02786450c0 259 int N5110::getPixel(unsigned int const x,
YHX 0:4b02786450c0 260 unsigned int const y) const
YHX 0:4b02786450c0 261 {
YHX 0:4b02786450c0 262 if (x<WIDTH && y<HEIGHT) { // check within range
YHX 0:4b02786450c0 263 // return relevant bank and mask required bit
YHX 0:4b02786450c0 264
YHX 0:4b02786450c0 265 int pixel = (int) buffer[x][y/8] & (1 << y%8);
YHX 0:4b02786450c0 266
YHX 0:4b02786450c0 267 if (pixel)
YHX 0:4b02786450c0 268 return 1;
YHX 0:4b02786450c0 269 else
YHX 0:4b02786450c0 270 return 0;
YHX 0:4b02786450c0 271 }
YHX 0:4b02786450c0 272
YHX 0:4b02786450c0 273 return 0;
YHX 0:4b02786450c0 274
YHX 0:4b02786450c0 275 }
YHX 0:4b02786450c0 276
YHX 0:4b02786450c0 277 // function to refresh the display
YHX 0:4b02786450c0 278 void N5110::refresh()
YHX 0:4b02786450c0 279 {
YHX 0:4b02786450c0 280 setXYAddress(0,0); // important to set address back to 0,0 before refreshing display
YHX 0:4b02786450c0 281 // address auto increments after printing string, so buffer[0][0] will not coincide
YHX 0:4b02786450c0 282 // with top-left pixel after priting string
YHX 0:4b02786450c0 283
YHX 0:4b02786450c0 284 _sce->write(0); //set CE low to begin frame
YHX 0:4b02786450c0 285
YHX 0:4b02786450c0 286 for(int j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
YHX 0:4b02786450c0 287 for(int i = 0; i < WIDTH; i++) {
YHX 0:4b02786450c0 288 _spi->write(buffer[i][j]); // send buffer
YHX 0:4b02786450c0 289 }
YHX 0:4b02786450c0 290 }
YHX 0:4b02786450c0 291 _sce->write(1); // set CE high to end frame
YHX 0:4b02786450c0 292
YHX 0:4b02786450c0 293 }
YHX 0:4b02786450c0 294
YHX 0:4b02786450c0 295 // fills the buffer with random bytes. Can be used to test the display.
YHX 0:4b02786450c0 296 // The rand() function isn't seeded so it probably creates the same pattern everytime
YHX 0:4b02786450c0 297 void N5110::randomiseBuffer()
YHX 0:4b02786450c0 298 {
YHX 0:4b02786450c0 299 int i,j;
YHX 0:4b02786450c0 300 for(j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
YHX 0:4b02786450c0 301 for(i = 0; i < WIDTH; i++) {
YHX 0:4b02786450c0 302 buffer[i][j] = rand()%256; // generate random byte
YHX 0:4b02786450c0 303 }
YHX 0:4b02786450c0 304 }
YHX 0:4b02786450c0 305
YHX 0:4b02786450c0 306 }
YHX 0:4b02786450c0 307
YHX 0:4b02786450c0 308 // function to print 5x7 font
YHX 0:4b02786450c0 309 void N5110::printChar(char const c,
YHX 0:4b02786450c0 310 unsigned int const x,
YHX 0:4b02786450c0 311 unsigned int const y)
YHX 0:4b02786450c0 312 {
YHX 0:4b02786450c0 313 if (y<BANKS) { // check if printing in range of y banks
YHX 0:4b02786450c0 314
YHX 0:4b02786450c0 315 for (int i = 0; i < 5 ; i++ ) {
YHX 0:4b02786450c0 316 int pixel_x = x+i;
YHX 0:4b02786450c0 317 if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83)
YHX 0:4b02786450c0 318 break;
YHX 0:4b02786450c0 319 buffer[pixel_x][y] = font5x7[(c - 32)*5 + i];
YHX 0:4b02786450c0 320 // array is offset by 32 relative to ASCII, each character is 5 pixels wide
YHX 0:4b02786450c0 321 }
YHX 0:4b02786450c0 322
YHX 0:4b02786450c0 323 }
YHX 0:4b02786450c0 324 }
YHX 0:4b02786450c0 325
YHX 0:4b02786450c0 326 // function to print string at specified position
YHX 0:4b02786450c0 327 void N5110::printString(const char *str,
YHX 0:4b02786450c0 328 unsigned int const x,
YHX 0:4b02786450c0 329 unsigned int const y)
YHX 0:4b02786450c0 330 {
YHX 0:4b02786450c0 331 if (y<BANKS) { // check if printing in range of y banks
YHX 0:4b02786450c0 332
YHX 0:4b02786450c0 333 int n = 0 ; // counter for number of characters in string
YHX 0:4b02786450c0 334 // loop through string and print character
YHX 0:4b02786450c0 335 while(*str) {
YHX 0:4b02786450c0 336
YHX 0:4b02786450c0 337 // writes the character bitmap data to the buffer, so that
YHX 0:4b02786450c0 338 // text and pixels can be displayed at the same time
YHX 0:4b02786450c0 339 for (int i = 0; i < 5 ; i++ ) {
YHX 0:4b02786450c0 340 int pixel_x = x+i+n*6;
YHX 0:4b02786450c0 341 if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83)
YHX 0:4b02786450c0 342 break;
YHX 0:4b02786450c0 343 buffer[pixel_x][y] = font5x7[(*str - 32)*5 + i];
YHX 0:4b02786450c0 344 }
YHX 0:4b02786450c0 345 str++; // go to next character in string
YHX 0:4b02786450c0 346 n++; // increment index
YHX 0:4b02786450c0 347 }
YHX 0:4b02786450c0 348 }
YHX 0:4b02786450c0 349 }
YHX 0:4b02786450c0 350
YHX 0:4b02786450c0 351 // function to clear the screen buffer
YHX 0:4b02786450c0 352 void N5110::clear()
YHX 0:4b02786450c0 353 {
YHX 0:4b02786450c0 354 memset(buffer,0,sizeof(buffer));
YHX 0:4b02786450c0 355 }
YHX 0:4b02786450c0 356
YHX 0:4b02786450c0 357 // function to plot array on display
YHX 0:4b02786450c0 358 void N5110::plotArray(float const array[])
YHX 0:4b02786450c0 359 {
YHX 0:4b02786450c0 360 for (int i=0; i<WIDTH; i++) { // loop through array
YHX 0:4b02786450c0 361 // elements are normalised from 0.0 to 1.0, so multiply
YHX 0:4b02786450c0 362 // by 47 to convert to pixel range, and subtract from 47
YHX 0:4b02786450c0 363 // since top-left is 0,0 in the display geometry
YHX 0:4b02786450c0 364 setPixel(i,47 - int(array[i]*47.0f),true);
YHX 0:4b02786450c0 365 }
YHX 0:4b02786450c0 366
YHX 0:4b02786450c0 367 }
YHX 0:4b02786450c0 368
YHX 0:4b02786450c0 369 // function to draw circle
YHX 0:4b02786450c0 370 void N5110:: drawCircle(unsigned int const x0,
YHX 0:4b02786450c0 371 unsigned int const y0,
YHX 0:4b02786450c0 372 unsigned int const radius,
YHX 0:4b02786450c0 373 FillType const fill)
YHX 0:4b02786450c0 374 {
YHX 0:4b02786450c0 375 // from http://en.wikipedia.org/wiki/Midpoint_circle_algorithm
YHX 0:4b02786450c0 376 int x = radius;
YHX 0:4b02786450c0 377 int y = 0;
YHX 0:4b02786450c0 378 int radiusError = 1-x;
YHX 0:4b02786450c0 379
YHX 0:4b02786450c0 380 while(x >= y) {
YHX 0:4b02786450c0 381
YHX 0:4b02786450c0 382 // if transparent, just draw outline
YHX 0:4b02786450c0 383 if (fill == FILL_TRANSPARENT) {
YHX 0:4b02786450c0 384 setPixel( x + x0, y + y0,true);
YHX 0:4b02786450c0 385 setPixel(-x + x0, y + y0,true);
YHX 0:4b02786450c0 386 setPixel( y + x0, x + y0,true);
YHX 0:4b02786450c0 387 setPixel(-y + x0, x + y0,true);
YHX 0:4b02786450c0 388 setPixel(-y + x0, -x + y0,true);
YHX 0:4b02786450c0 389 setPixel( y + x0, -x + y0,true);
YHX 0:4b02786450c0 390 setPixel( x + x0, -y + y0,true);
YHX 0:4b02786450c0 391 setPixel(-x + x0, -y + y0,true);
YHX 0:4b02786450c0 392 } else { // drawing filled circle, so draw lines between points at same y value
YHX 0:4b02786450c0 393
YHX 0:4b02786450c0 394 int type = (fill==FILL_BLACK) ? 1:0; // black or white fill
YHX 0:4b02786450c0 395
YHX 0:4b02786450c0 396 drawLine(x+x0,y+y0,-x+x0,y+y0,type);
YHX 0:4b02786450c0 397 drawLine(y+x0,x+y0,-y+x0,x+y0,type);
YHX 0:4b02786450c0 398 drawLine(y+x0,-x+y0,-y+x0,-x+y0,type);
YHX 0:4b02786450c0 399 drawLine(x+x0,-y+y0,-x+x0,-y+y0,type);
YHX 0:4b02786450c0 400 }
YHX 0:4b02786450c0 401
YHX 0:4b02786450c0 402 y++;
YHX 0:4b02786450c0 403 if (radiusError<0) {
YHX 0:4b02786450c0 404 radiusError += 2 * y + 1;
YHX 0:4b02786450c0 405 } else {
YHX 0:4b02786450c0 406 x--;
YHX 0:4b02786450c0 407 radiusError += 2 * (y - x) + 1;
YHX 0:4b02786450c0 408 }
YHX 0:4b02786450c0 409 }
YHX 0:4b02786450c0 410
YHX 0:4b02786450c0 411 }
YHX 0:4b02786450c0 412
YHX 0:4b02786450c0 413 void N5110::drawLine(unsigned int const x0,
YHX 0:4b02786450c0 414 unsigned int const y0,
YHX 0:4b02786450c0 415 unsigned int const x1,
YHX 0:4b02786450c0 416 unsigned int const y1,
YHX 0:4b02786450c0 417 unsigned int const type)
YHX 0:4b02786450c0 418 {
YHX 0:4b02786450c0 419 // Note that the ranges can be negative so we have to turn the input values
YHX 0:4b02786450c0 420 // into signed integers first
YHX 0:4b02786450c0 421 int const y_range = static_cast<int>(y1) - static_cast<int>(y0);
YHX 0:4b02786450c0 422 int const x_range = static_cast<int>(x1) - static_cast<int>(x0);
YHX 0:4b02786450c0 423
YHX 0:4b02786450c0 424 // if dotted line, set step to 2, else step is 1
YHX 0:4b02786450c0 425 unsigned int const step = (type==2) ? 2:1;
YHX 0:4b02786450c0 426
YHX 0:4b02786450c0 427 // make sure we loop over the largest range to get the most pixels on the display
YHX 0:4b02786450c0 428 // for instance, if drawing a vertical line (x_range = 0), we need to loop down the y pixels
YHX 0:4b02786450c0 429 // or else we'll only end up with 1 pixel in the x column
YHX 0:4b02786450c0 430 if ( abs(x_range) > abs(y_range) ) {
YHX 0:4b02786450c0 431
YHX 0:4b02786450c0 432 // ensure we loop from smallest to largest or else for-loop won't run as expected
YHX 0:4b02786450c0 433 unsigned int const start = x_range > 0 ? x0:x1;
YHX 0:4b02786450c0 434 unsigned int const stop = x_range > 0 ? x1:x0;
YHX 0:4b02786450c0 435
YHX 0:4b02786450c0 436 // loop between x pixels
YHX 0:4b02786450c0 437 for (unsigned int x = start; x<= stop ; x+=step) {
YHX 0:4b02786450c0 438 // do linear interpolation
YHX 0:4b02786450c0 439 int const dx = static_cast<int>(x)-static_cast<int>(x0);
YHX 0:4b02786450c0 440 unsigned int const y = y0 + y_range * dx / x_range;
YHX 0:4b02786450c0 441
YHX 0:4b02786450c0 442 // If the line type is '0', this will clear the pixel
YHX 0:4b02786450c0 443 // If it is '1' or '2', the pixel will be set
YHX 0:4b02786450c0 444 setPixel(x,y, type);
YHX 0:4b02786450c0 445 }
YHX 0:4b02786450c0 446 } else {
YHX 0:4b02786450c0 447
YHX 0:4b02786450c0 448 // ensure we loop from smallest to largest or else for-loop won't run as expected
YHX 0:4b02786450c0 449 unsigned int const start = y_range > 0 ? y0:y1;
YHX 0:4b02786450c0 450 unsigned int const stop = y_range > 0 ? y1:y0;
YHX 0:4b02786450c0 451
YHX 0:4b02786450c0 452 for (unsigned int y = start; y<= stop ; y+=step) {
YHX 0:4b02786450c0 453 // do linear interpolation
YHX 0:4b02786450c0 454 int const dy = static_cast<int>(y)-static_cast<int>(y0);
YHX 0:4b02786450c0 455 unsigned int const x = x0 + x_range * dy / y_range;
YHX 0:4b02786450c0 456
YHX 0:4b02786450c0 457 // If the line type is '0', this will clear the pixel
YHX 0:4b02786450c0 458 // If it is '1' or '2', the pixel will be set
YHX 0:4b02786450c0 459 setPixel(x,y, type);
YHX 0:4b02786450c0 460 }
YHX 0:4b02786450c0 461 }
YHX 0:4b02786450c0 462
YHX 0:4b02786450c0 463 }
YHX 0:4b02786450c0 464
YHX 0:4b02786450c0 465 void N5110::drawRect(unsigned int const x0,
YHX 0:4b02786450c0 466 unsigned int const y0,
YHX 0:4b02786450c0 467 unsigned int const width,
YHX 0:4b02786450c0 468 unsigned int const height,
YHX 0:4b02786450c0 469 FillType const fill)
YHX 0:4b02786450c0 470 {
YHX 0:4b02786450c0 471 if (fill == FILL_TRANSPARENT) { // transparent, just outline
YHX 0:4b02786450c0 472 drawLine(x0,y0,x0+(width-1),y0,1); // top
YHX 0:4b02786450c0 473 drawLine(x0,y0+(height-1),x0+(width-1),y0+(height-1),1); // bottom
YHX 0:4b02786450c0 474 drawLine(x0,y0,x0,y0+(height-1),1); // left
YHX 0:4b02786450c0 475 drawLine(x0+(width-1),y0,x0+(width-1),y0+(height-1),1); // right
YHX 0:4b02786450c0 476 } else { // filled rectangle
YHX 0:4b02786450c0 477 int type = (fill==FILL_BLACK) ? 1:0; // black or white fill
YHX 0:4b02786450c0 478 for (int y = y0; y<y0+height; y++) { // loop through rows of rectangle
YHX 0:4b02786450c0 479 drawLine(x0,y,x0+(width-1),y,type); // draw line across screen
YHX 0:4b02786450c0 480 }
YHX 0:4b02786450c0 481 }
YHX 0:4b02786450c0 482 }
YHX 0:4b02786450c0 483
YHX 0:4b02786450c0 484 void N5110::drawSprite(int x0,
YHX 0:4b02786450c0 485 int y0,
YHX 0:4b02786450c0 486 int nrows,
YHX 0:4b02786450c0 487 int ncols,
YHX 0:4b02786450c0 488 int *sprite)
YHX 0:4b02786450c0 489 {
YHX 0:4b02786450c0 490 for (int i = 0; i < nrows; i++) {
YHX 0:4b02786450c0 491 for (int j = 0 ; j < ncols ; j++) {
YHX 0:4b02786450c0 492
YHX 0:4b02786450c0 493 int pixel = *((sprite+i*ncols)+j);
YHX 0:4b02786450c0 494 setPixel(x0+j,y0+i, pixel);
YHX 0:4b02786450c0 495 }
YHX 0:4b02786450c0 496 }
YHX 0:4b02786450c0 497 }