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Dependencies:   mbed

Fork of ll14zs by Zeshaan Saeed

N5110/N5110.cpp@0:2211174dee1c, 2018-04-26 (annotated)

Committer:
ll14zs
Date:
Thu Apr 26 11:21:48 2018 +0000
Revision:
0:2211174dee1c
initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ll14zs 0:2211174dee1c 1 #include "mbed.h"
ll14zs 0:2211174dee1c 2 #include "N5110.h"
ll14zs 0:2211174dee1c 3
ll14zs 0:2211174dee1c 4 // overloaded constructor includes power pin - LCD Vcc connected to GPIO pin
ll14zs 0:2211174dee1c 5 // this constructor works fine with LPC1768 - enough current sourced from GPIO
ll14zs 0:2211174dee1c 6 // to power LCD. Doesn't work well with K64F.
ll14zs 0:2211174dee1c 7 N5110::N5110(PinName const pwrPin,
ll14zs 0:2211174dee1c 8 PinName const scePin,
ll14zs 0:2211174dee1c 9 PinName const rstPin,
ll14zs 0:2211174dee1c 10 PinName const dcPin,
ll14zs 0:2211174dee1c 11 PinName const mosiPin,
ll14zs 0:2211174dee1c 12 PinName const sclkPin,
ll14zs 0:2211174dee1c 13 PinName const ledPin)
ll14zs 0:2211174dee1c 14 :
ll14zs 0:2211174dee1c 15 _spi(new SPI(mosiPin,NC,sclkPin)), // create new SPI instance and initialise
ll14zs 0:2211174dee1c 16 _led(new PwmOut(ledPin)),
ll14zs 0:2211174dee1c 17 _pwr(new DigitalOut(pwrPin)),
ll14zs 0:2211174dee1c 18 _sce(new DigitalOut(scePin)),
ll14zs 0:2211174dee1c 19 _rst(new DigitalOut(rstPin)),
ll14zs 0:2211174dee1c 20 _dc(new DigitalOut(dcPin))
ll14zs 0:2211174dee1c 21 {}
ll14zs 0:2211174dee1c 22
ll14zs 0:2211174dee1c 23 // overloaded constructor does not include power pin - LCD Vcc must be tied to +3V3
ll14zs 0:2211174dee1c 24 // Best to use this with K64F as the GPIO hasn't sufficient output current to reliably
ll14zs 0:2211174dee1c 25 // drive the LCD.
ll14zs 0:2211174dee1c 26 N5110::N5110(PinName const scePin,
ll14zs 0:2211174dee1c 27 PinName const rstPin,
ll14zs 0:2211174dee1c 28 PinName const dcPin,
ll14zs 0:2211174dee1c 29 PinName const mosiPin,
ll14zs 0:2211174dee1c 30 PinName const sclkPin,
ll14zs 0:2211174dee1c 31 PinName const ledPin)
ll14zs 0:2211174dee1c 32 :
ll14zs 0:2211174dee1c 33 _spi(new SPI(mosiPin,NC,sclkPin)), // create new SPI instance and initialise
ll14zs 0:2211174dee1c 34 _led(new PwmOut(ledPin)),
ll14zs 0:2211174dee1c 35 _pwr(NULL), // pwr not needed so null it to be safe
ll14zs 0:2211174dee1c 36 _sce(new DigitalOut(scePin)),
ll14zs 0:2211174dee1c 37 _rst(new DigitalOut(rstPin)),
ll14zs 0:2211174dee1c 38 _dc(new DigitalOut(dcPin))
ll14zs 0:2211174dee1c 39 {}
ll14zs 0:2211174dee1c 40
ll14zs 0:2211174dee1c 41 N5110::~N5110()
ll14zs 0:2211174dee1c 42 {
ll14zs 0:2211174dee1c 43 delete _spi;
ll14zs 0:2211174dee1c 44
ll14zs 0:2211174dee1c 45 if(_pwr) {
ll14zs 0:2211174dee1c 46 delete _pwr;
ll14zs 0:2211174dee1c 47 }
ll14zs 0:2211174dee1c 48
ll14zs 0:2211174dee1c 49 delete _led;
ll14zs 0:2211174dee1c 50 delete _sce;
ll14zs 0:2211174dee1c 51 delete _rst;
ll14zs 0:2211174dee1c 52 delete _dc;
ll14zs 0:2211174dee1c 53 }
ll14zs 0:2211174dee1c 54
ll14zs 0:2211174dee1c 55 // initialise function - powers up and sends the initialisation commands
ll14zs 0:2211174dee1c 56 void N5110::init()
ll14zs 0:2211174dee1c 57 {
ll14zs 0:2211174dee1c 58 turnOn(); // power up
ll14zs 0:2211174dee1c 59 reset(); // reset LCD - must be done within 100 ms
ll14zs 0:2211174dee1c 60 initSPI();
ll14zs 0:2211174dee1c 61
ll14zs 0:2211174dee1c 62 setContrast(0.55); // this may need tuning (say 0.4 to 0.6)
ll14zs 0:2211174dee1c 63 setBias(3); // datasheet - 48:1 mux - don't mess with if you don't know what you're doing! (0 to 7)
ll14zs 0:2211174dee1c 64 setTempCoefficient(0); // datasheet - may need increasing (range 0 to 3) at very low temperatures
ll14zs 0:2211174dee1c 65 normalMode(); // normal video mode by default
ll14zs 0:2211174dee1c 66
ll14zs 0:2211174dee1c 67 clearRAM(); // RAM is undefined at power-up so clear to be sure
ll14zs 0:2211174dee1c 68 clear(); // clear buffer
ll14zs 0:2211174dee1c 69 setBrightness(0.5);
ll14zs 0:2211174dee1c 70 }
ll14zs 0:2211174dee1c 71
ll14zs 0:2211174dee1c 72 // sets normal video mode (black on white)
ll14zs 0:2211174dee1c 73 void N5110::normalMode()
ll14zs 0:2211174dee1c 74 {
ll14zs 0:2211174dee1c 75 sendCommand(0b00100000); // basic instruction
ll14zs 0:2211174dee1c 76 sendCommand(0b00001100); // normal video mode- datasheet
ll14zs 0:2211174dee1c 77 }
ll14zs 0:2211174dee1c 78
ll14zs 0:2211174dee1c 79 // sets normal video mode (white on black)
ll14zs 0:2211174dee1c 80 void N5110::inverseMode()
ll14zs 0:2211174dee1c 81 {
ll14zs 0:2211174dee1c 82 sendCommand(0b00100000); // basic instruction
ll14zs 0:2211174dee1c 83 sendCommand(0b00001101); // inverse video mode - datasheet
ll14zs 0:2211174dee1c 84 }
ll14zs 0:2211174dee1c 85
ll14zs 0:2211174dee1c 86 // function to power up the LCD and backlight - only works when using GPIO to power
ll14zs 0:2211174dee1c 87 void N5110::turnOn()
ll14zs 0:2211174dee1c 88 {
ll14zs 0:2211174dee1c 89 if (_pwr != NULL) {
ll14zs 0:2211174dee1c 90 _pwr->write(1); // apply power
ll14zs 0:2211174dee1c 91 }
ll14zs 0:2211174dee1c 92 }
ll14zs 0:2211174dee1c 93
ll14zs 0:2211174dee1c 94 // function to power down LCD
ll14zs 0:2211174dee1c 95 void N5110::turnOff()
ll14zs 0:2211174dee1c 96 {
ll14zs 0:2211174dee1c 97 clear(); // clear buffer
ll14zs 0:2211174dee1c 98 refresh();
ll14zs 0:2211174dee1c 99 setBrightness(0.0); // turn backlight off
ll14zs 0:2211174dee1c 100 clearRAM(); // clear RAM to ensure specified current consumption
ll14zs 0:2211174dee1c 101 // send command to ensure we are in basic mode
ll14zs 0:2211174dee1c 102
ll14zs 0:2211174dee1c 103 sendCommand(0b00100000); // basic mode
ll14zs 0:2211174dee1c 104 sendCommand(0b00001000); // clear display
ll14zs 0:2211174dee1c 105 sendCommand(0b00100001); // extended mode
ll14zs 0:2211174dee1c 106 sendCommand(0b00100100); // power down
ll14zs 0:2211174dee1c 107
ll14zs 0:2211174dee1c 108 // if we are powering the LCD using the GPIO then make it low to turn off
ll14zs 0:2211174dee1c 109 if (_pwr != NULL) {
ll14zs 0:2211174dee1c 110 wait_ms(10); // small delay and then turn off the power pin
ll14zs 0:2211174dee1c 111 _pwr->write(0); // turn off power
ll14zs 0:2211174dee1c 112 }
ll14zs 0:2211174dee1c 113
ll14zs 0:2211174dee1c 114 }
ll14zs 0:2211174dee1c 115
ll14zs 0:2211174dee1c 116 // function to change LED backlight brightness
ll14zs 0:2211174dee1c 117 void N5110::setBrightness(float brightness)
ll14zs 0:2211174dee1c 118 {
ll14zs 0:2211174dee1c 119 // check whether brightness is within range
ll14zs 0:2211174dee1c 120 if (brightness < 0.0f)
ll14zs 0:2211174dee1c 121 brightness = 0.0f;
ll14zs 0:2211174dee1c 122 if (brightness > 1.0f)
ll14zs 0:2211174dee1c 123 brightness = 1.0f;
ll14zs 0:2211174dee1c 124 // set PWM duty cycle
ll14zs 0:2211174dee1c 125 _led->write(brightness);
ll14zs 0:2211174dee1c 126 }
ll14zs 0:2211174dee1c 127
ll14zs 0:2211174dee1c 128 void N5110::setContrast(float contrast) {
ll14zs 0:2211174dee1c 129
ll14zs 0:2211174dee1c 130 // enforce limits
ll14zs 0:2211174dee1c 131 if (contrast > 1.0f)
ll14zs 0:2211174dee1c 132 contrast = 1.0f;
ll14zs 0:2211174dee1c 133 else if (contrast < 0.0f)
ll14zs 0:2211174dee1c 134 contrast = 0.0;
ll14zs 0:2211174dee1c 135
ll14zs 0:2211174dee1c 136 // convert to char in range 0 to 127 (i.e. 6 bits)
ll14zs 0:2211174dee1c 137 char ic = char(contrast*127.0f);
ll14zs 0:2211174dee1c 138
ll14zs 0:2211174dee1c 139 sendCommand(0b00100001); // extended instruction set
ll14zs 0:2211174dee1c 140 sendCommand(0b10000000 | ic); // set Vop (which controls contrast)
ll14zs 0:2211174dee1c 141 sendCommand(0b00100000); // back to basic instruction set
ll14zs 0:2211174dee1c 142 }
ll14zs 0:2211174dee1c 143
ll14zs 0:2211174dee1c 144 void N5110::setTempCoefficient(char tc) {
ll14zs 0:2211174dee1c 145
ll14zs 0:2211174dee1c 146 // enforce limits
ll14zs 0:2211174dee1c 147 if (tc>3) {
ll14zs 0:2211174dee1c 148 tc=3;
ll14zs 0:2211174dee1c 149 }
ll14zs 0:2211174dee1c 150
ll14zs 0:2211174dee1c 151 // temperature coefficient may need increasing at low temperatures
ll14zs 0:2211174dee1c 152
ll14zs 0:2211174dee1c 153 sendCommand(0b00100001); // extended instruction set
ll14zs 0:2211174dee1c 154 sendCommand(0b00000100 | tc);
ll14zs 0:2211174dee1c 155 sendCommand(0b00100000); // back to basic instruction set
ll14zs 0:2211174dee1c 156 }
ll14zs 0:2211174dee1c 157
ll14zs 0:2211174dee1c 158 void N5110::setBias(char bias) {
ll14zs 0:2211174dee1c 159
ll14zs 0:2211174dee1c 160 // from data sheet
ll14zs 0:2211174dee1c 161 // bias mux rate
ll14zs 0:2211174dee1c 162 // 0 1:100
ll14zs 0:2211174dee1c 163 // 1 1:80
ll14zs 0:2211174dee1c 164 // 2 1:65
ll14zs 0:2211174dee1c 165 // 3 1:48 (default)
ll14zs 0:2211174dee1c 166 // 4 1:40/1:34
ll14zs 0:2211174dee1c 167 // 5 1:24
ll14zs 0:2211174dee1c 168 // 6 1:18/1:16
ll14zs 0:2211174dee1c 169 // 7 1:10/1:9/1:8
ll14zs 0:2211174dee1c 170
ll14zs 0:2211174dee1c 171 // enforce limits
ll14zs 0:2211174dee1c 172 if (bias>7) {
ll14zs 0:2211174dee1c 173 bias=7;
ll14zs 0:2211174dee1c 174 }
ll14zs 0:2211174dee1c 175
ll14zs 0:2211174dee1c 176 sendCommand(0b00100001); // extended mode instruction
ll14zs 0:2211174dee1c 177 sendCommand(0b00010000 | bias);
ll14zs 0:2211174dee1c 178 sendCommand(0b00100000); // end of extended mode instruction
ll14zs 0:2211174dee1c 179 }
ll14zs 0:2211174dee1c 180
ll14zs 0:2211174dee1c 181 // pulse the active low reset line
ll14zs 0:2211174dee1c 182 void N5110::reset()
ll14zs 0:2211174dee1c 183 {
ll14zs 0:2211174dee1c 184 _rst->write(0); // reset the LCD
ll14zs 0:2211174dee1c 185 _rst->write(1);
ll14zs 0:2211174dee1c 186 }
ll14zs 0:2211174dee1c 187
ll14zs 0:2211174dee1c 188 // function to initialise SPI peripheral
ll14zs 0:2211174dee1c 189 void N5110::initSPI()
ll14zs 0:2211174dee1c 190 {
ll14zs 0:2211174dee1c 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
ll14zs 0:2211174dee1c 192 _spi->frequency(4000000); // maximum of screen is 4 MHz
ll14zs 0:2211174dee1c 193 }
ll14zs 0:2211174dee1c 194
ll14zs 0:2211174dee1c 195 // send a command to the display
ll14zs 0:2211174dee1c 196 void N5110::sendCommand(unsigned char command)
ll14zs 0:2211174dee1c 197 {
ll14zs 0:2211174dee1c 198 _dc->write(0); // set DC low for command
ll14zs 0:2211174dee1c 199 _sce->write(0); // set CE low to begin frame
ll14zs 0:2211174dee1c 200 _spi->write(command); // send command
ll14zs 0:2211174dee1c 201 _dc->write(1); // turn back to data by default
ll14zs 0:2211174dee1c 202 _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
ll14zs 0:2211174dee1c 203 }
ll14zs 0:2211174dee1c 204
ll14zs 0:2211174dee1c 205 // send data to the display at the current XY address
ll14zs 0:2211174dee1c 206 // dc is set to 1 (i.e. data) after sending a command and so should
ll14zs 0:2211174dee1c 207 // be the default mode.
ll14zs 0:2211174dee1c 208 void N5110::sendData(unsigned char data)
ll14zs 0:2211174dee1c 209 {
ll14zs 0:2211174dee1c 210 _sce->write(0); // set CE low to begin frame
ll14zs 0:2211174dee1c 211 _spi->write(data);
ll14zs 0:2211174dee1c 212 _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
ll14zs 0:2211174dee1c 213 }
ll14zs 0:2211174dee1c 214
ll14zs 0:2211174dee1c 215 // this function writes 0 to the 504 bytes to clear the RAM
ll14zs 0:2211174dee1c 216 void N5110::clearRAM()
ll14zs 0:2211174dee1c 217 {
ll14zs 0:2211174dee1c 218 _sce->write(0); //set CE low to begin frame
ll14zs 0:2211174dee1c 219 for(int i = 0; i < WIDTH * HEIGHT; i++) { // 48 x 84 bits = 504 bytes
ll14zs 0:2211174dee1c 220 _spi->write(0x00); // send 0's
ll14zs 0:2211174dee1c 221 }
ll14zs 0:2211174dee1c 222 _sce->write(1); // set CE high to end frame
ll14zs 0:2211174dee1c 223 }
ll14zs 0:2211174dee1c 224
ll14zs 0:2211174dee1c 225 // function to set the XY address in RAM for subsequenct data write
ll14zs 0:2211174dee1c 226 void N5110::setXYAddress(unsigned int const x,
ll14zs 0:2211174dee1c 227 unsigned int const y)
ll14zs 0:2211174dee1c 228 {
ll14zs 0:2211174dee1c 229 if (x<WIDTH && y<HEIGHT) { // check within range
ll14zs 0:2211174dee1c 230 sendCommand(0b00100000); // basic instruction
ll14zs 0:2211174dee1c 231 sendCommand(0b10000000 | x); // send addresses to display with relevant mask
ll14zs 0:2211174dee1c 232 sendCommand(0b01000000 | y);
ll14zs 0:2211174dee1c 233 }
ll14zs 0:2211174dee1c 234 }
ll14zs 0:2211174dee1c 235
ll14zs 0:2211174dee1c 236 // These functions are used to set, clear and get the value of pixels in the display
ll14zs 0:2211174dee1c 237 // Pixels are addressed in the range of 0 to 47 (y) and 0 to 83 (x). The refresh()
ll14zs 0:2211174dee1c 238 // function must be called after set and clear in order to update the display
ll14zs 0:2211174dee1c 239 void N5110::setPixel(unsigned int const x,
ll14zs 0:2211174dee1c 240 unsigned int const y,
ll14zs 0:2211174dee1c 241 bool const state)
ll14zs 0:2211174dee1c 242 {
ll14zs 0:2211174dee1c 243 if (x<WIDTH && y<HEIGHT) { // check within range
ll14zs 0:2211174dee1c 244 // calculate bank and shift 1 to required position in the data byte
ll14zs 0:2211174dee1c 245 if(state) buffer[x][y/8] |= (1 << y%8);
ll14zs 0:2211174dee1c 246 else buffer[x][y/8] &= ~(1 << y%8);
ll14zs 0:2211174dee1c 247 }
ll14zs 0:2211174dee1c 248 }
ll14zs 0:2211174dee1c 249
ll14zs 0:2211174dee1c 250 void N5110::clearPixel(unsigned int const x,
ll14zs 0:2211174dee1c 251 unsigned int const y)
ll14zs 0:2211174dee1c 252 {
ll14zs 0:2211174dee1c 253 if (x<WIDTH && y<HEIGHT) { // check within range
ll14zs 0:2211174dee1c 254 // calculate bank and shift 1 to required position (using bit clear)
ll14zs 0:2211174dee1c 255 buffer[x][y/8] &= ~(1 << y%8);
ll14zs 0:2211174dee1c 256 }
ll14zs 0:2211174dee1c 257 }
ll14zs 0:2211174dee1c 258
ll14zs 0:2211174dee1c 259 int N5110::getPixel(unsigned int const x,
ll14zs 0:2211174dee1c 260 unsigned int const y) const
ll14zs 0:2211174dee1c 261 {
ll14zs 0:2211174dee1c 262 if (x<WIDTH && y<HEIGHT) { // check within range
ll14zs 0:2211174dee1c 263 // return relevant bank and mask required bit
ll14zs 0:2211174dee1c 264
ll14zs 0:2211174dee1c 265 int pixel = (int) buffer[x][y/8] & (1 << y%8);
ll14zs 0:2211174dee1c 266
ll14zs 0:2211174dee1c 267 if (pixel)
ll14zs 0:2211174dee1c 268 return 1;
ll14zs 0:2211174dee1c 269 else
ll14zs 0:2211174dee1c 270 return 0;
ll14zs 0:2211174dee1c 271 }
ll14zs 0:2211174dee1c 272
ll14zs 0:2211174dee1c 273 return 0;
ll14zs 0:2211174dee1c 274
ll14zs 0:2211174dee1c 275 }
ll14zs 0:2211174dee1c 276
ll14zs 0:2211174dee1c 277 // function to refresh the display
ll14zs 0:2211174dee1c 278 void N5110::refresh()
ll14zs 0:2211174dee1c 279 {
ll14zs 0:2211174dee1c 280 setXYAddress(0,0); // important to set address back to 0,0 before refreshing display
ll14zs 0:2211174dee1c 281 // address auto increments after printing string, so buffer[0][0] will not coincide
ll14zs 0:2211174dee1c 282 // with top-left pixel after priting string
ll14zs 0:2211174dee1c 283
ll14zs 0:2211174dee1c 284 _sce->write(0); //set CE low to begin frame
ll14zs 0:2211174dee1c 285
ll14zs 0:2211174dee1c 286 for(int j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
ll14zs 0:2211174dee1c 287 for(int i = 0; i < WIDTH; i++) {
ll14zs 0:2211174dee1c 288 _spi->write(buffer[i][j]); // send buffer
ll14zs 0:2211174dee1c 289 }
ll14zs 0:2211174dee1c 290 }
ll14zs 0:2211174dee1c 291 _sce->write(1); // set CE high to end frame
ll14zs 0:2211174dee1c 292
ll14zs 0:2211174dee1c 293 }
ll14zs 0:2211174dee1c 294
ll14zs 0:2211174dee1c 295 // fills the buffer with random bytes. Can be used to test the display.
ll14zs 0:2211174dee1c 296 // The rand() function isn't seeded so it probably creates the same pattern everytime
ll14zs 0:2211174dee1c 297 void N5110::randomiseBuffer()
ll14zs 0:2211174dee1c 298 {
ll14zs 0:2211174dee1c 299 int i,j;
ll14zs 0:2211174dee1c 300 for(j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
ll14zs 0:2211174dee1c 301 for(i = 0; i < WIDTH; i++) {
ll14zs 0:2211174dee1c 302 buffer[i][j] = rand()%256; // generate random byte
ll14zs 0:2211174dee1c 303 }
ll14zs 0:2211174dee1c 304 }
ll14zs 0:2211174dee1c 305
ll14zs 0:2211174dee1c 306 }
ll14zs 0:2211174dee1c 307
ll14zs 0:2211174dee1c 308 // function to print 5x7 font
ll14zs 0:2211174dee1c 309 void N5110::printChar(char const c,
ll14zs 0:2211174dee1c 310 unsigned int const x,
ll14zs 0:2211174dee1c 311 unsigned int const y)
ll14zs 0:2211174dee1c 312 {
ll14zs 0:2211174dee1c 313 if (y<BANKS) { // check if printing in range of y banks
ll14zs 0:2211174dee1c 314
ll14zs 0:2211174dee1c 315 for (int i = 0; i < 5 ; i++ ) {
ll14zs 0:2211174dee1c 316 int pixel_x = x+i;
ll14zs 0:2211174dee1c 317 if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83)
ll14zs 0:2211174dee1c 318 break;
ll14zs 0:2211174dee1c 319 buffer[pixel_x][y] = font5x7[(c - 32)*5 + i];
ll14zs 0:2211174dee1c 320 // array is offset by 32 relative to ASCII, each character is 5 pixels wide
ll14zs 0:2211174dee1c 321 }
ll14zs 0:2211174dee1c 322
ll14zs 0:2211174dee1c 323 }
ll14zs 0:2211174dee1c 324 }
ll14zs 0:2211174dee1c 325
ll14zs 0:2211174dee1c 326 // function to print string at specified position
ll14zs 0:2211174dee1c 327 void N5110::printString(const char *str,
ll14zs 0:2211174dee1c 328 unsigned int const x,
ll14zs 0:2211174dee1c 329 unsigned int const y)
ll14zs 0:2211174dee1c 330 {
ll14zs 0:2211174dee1c 331 if (y<BANKS) { // check if printing in range of y banks
ll14zs 0:2211174dee1c 332
ll14zs 0:2211174dee1c 333 int n = 0 ; // counter for number of characters in string
ll14zs 0:2211174dee1c 334 // loop through string and print character
ll14zs 0:2211174dee1c 335 while(*str) {
ll14zs 0:2211174dee1c 336
ll14zs 0:2211174dee1c 337 // writes the character bitmap data to the buffer, so that
ll14zs 0:2211174dee1c 338 // text and pixels can be displayed at the same time
ll14zs 0:2211174dee1c 339 for (int i = 0; i < 5 ; i++ ) {
ll14zs 0:2211174dee1c 340 int pixel_x = x+i+n*6;
ll14zs 0:2211174dee1c 341 if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83)
ll14zs 0:2211174dee1c 342 break;
ll14zs 0:2211174dee1c 343 buffer[pixel_x][y] = font5x7[(*str - 32)*5 + i];
ll14zs 0:2211174dee1c 344 }
ll14zs 0:2211174dee1c 345 str++; // go to next character in string
ll14zs 0:2211174dee1c 346 n++; // increment index
ll14zs 0:2211174dee1c 347 }
ll14zs 0:2211174dee1c 348 }
ll14zs 0:2211174dee1c 349 }
ll14zs 0:2211174dee1c 350
ll14zs 0:2211174dee1c 351 // function to clear the screen buffer
ll14zs 0:2211174dee1c 352 void N5110::clear()
ll14zs 0:2211174dee1c 353 {
ll14zs 0:2211174dee1c 354 memset(buffer,0,sizeof(buffer));
ll14zs 0:2211174dee1c 355 }
ll14zs 0:2211174dee1c 356
ll14zs 0:2211174dee1c 357 // function to plot array on display
ll14zs 0:2211174dee1c 358 void N5110::plotArray(float const array[])
ll14zs 0:2211174dee1c 359 {
ll14zs 0:2211174dee1c 360 for (int i=0; i<WIDTH; i++) { // loop through array
ll14zs 0:2211174dee1c 361 // elements are normalised from 0.0 to 1.0, so multiply
ll14zs 0:2211174dee1c 362 // by 47 to convert to pixel range, and subtract from 47
ll14zs 0:2211174dee1c 363 // since top-left is 0,0 in the display geometry
ll14zs 0:2211174dee1c 364 setPixel(i,47 - int(array[i]*47.0f),true);
ll14zs 0:2211174dee1c 365 }
ll14zs 0:2211174dee1c 366
ll14zs 0:2211174dee1c 367 }
ll14zs 0:2211174dee1c 368
ll14zs 0:2211174dee1c 369 // function to draw circle
ll14zs 0:2211174dee1c 370 void N5110:: drawCircle(unsigned int const x0,
ll14zs 0:2211174dee1c 371 unsigned int const y0,
ll14zs 0:2211174dee1c 372 unsigned int const radius,
ll14zs 0:2211174dee1c 373 FillType const fill)
ll14zs 0:2211174dee1c 374 {
ll14zs 0:2211174dee1c 375 // from http://en.wikipedia.org/wiki/Midpoint_circle_algorithm
ll14zs 0:2211174dee1c 376 int x = radius;
ll14zs 0:2211174dee1c 377 int y = 0;
ll14zs 0:2211174dee1c 378 int radiusError = 1-x;
ll14zs 0:2211174dee1c 379
ll14zs 0:2211174dee1c 380 while(x >= y) {
ll14zs 0:2211174dee1c 381
ll14zs 0:2211174dee1c 382 // if transparent, just draw outline
ll14zs 0:2211174dee1c 383 if (fill == FILL_TRANSPARENT) {
ll14zs 0:2211174dee1c 384 setPixel( x + x0, y + y0,true);
ll14zs 0:2211174dee1c 385 setPixel(-x + x0, y + y0,true);
ll14zs 0:2211174dee1c 386 setPixel( y + x0, x + y0,true);
ll14zs 0:2211174dee1c 387 setPixel(-y + x0, x + y0,true);
ll14zs 0:2211174dee1c 388 setPixel(-y + x0, -x + y0,true);
ll14zs 0:2211174dee1c 389 setPixel( y + x0, -x + y0,true);
ll14zs 0:2211174dee1c 390 setPixel( x + x0, -y + y0,true);
ll14zs 0:2211174dee1c 391 setPixel(-x + x0, -y + y0,true);
ll14zs 0:2211174dee1c 392 } else { // drawing filled circle, so draw lines between points at same y value
ll14zs 0:2211174dee1c 393
ll14zs 0:2211174dee1c 394 int type = (fill==FILL_BLACK) ? 1:0; // black or white fill
ll14zs 0:2211174dee1c 395
ll14zs 0:2211174dee1c 396 drawLine(x+x0,y+y0,-x+x0,y+y0,type);
ll14zs 0:2211174dee1c 397 drawLine(y+x0,x+y0,-y+x0,x+y0,type);
ll14zs 0:2211174dee1c 398 drawLine(y+x0,-x+y0,-y+x0,-x+y0,type);
ll14zs 0:2211174dee1c 399 drawLine(x+x0,-y+y0,-x+x0,-y+y0,type);
ll14zs 0:2211174dee1c 400 }
ll14zs 0:2211174dee1c 401
ll14zs 0:2211174dee1c 402 y++;
ll14zs 0:2211174dee1c 403 if (radiusError<0) {
ll14zs 0:2211174dee1c 404 radiusError += 2 * y + 1;
ll14zs 0:2211174dee1c 405 } else {
ll14zs 0:2211174dee1c 406 x--;
ll14zs 0:2211174dee1c 407 radiusError += 2 * (y - x) + 1;
ll14zs 0:2211174dee1c 408 }
ll14zs 0:2211174dee1c 409 }
ll14zs 0:2211174dee1c 410
ll14zs 0:2211174dee1c 411 }
ll14zs 0:2211174dee1c 412
ll14zs 0:2211174dee1c 413 void N5110::drawLine(unsigned int const x0,
ll14zs 0:2211174dee1c 414 unsigned int const y0,
ll14zs 0:2211174dee1c 415 unsigned int const x1,
ll14zs 0:2211174dee1c 416 unsigned int const y1,
ll14zs 0:2211174dee1c 417 unsigned int const type)
ll14zs 0:2211174dee1c 418 {
ll14zs 0:2211174dee1c 419 // Note that the ranges can be negative so we have to turn the input values
ll14zs 0:2211174dee1c 420 // into signed integers first
ll14zs 0:2211174dee1c 421 int const y_range = static_cast<int>(y1) - static_cast<int>(y0);
ll14zs 0:2211174dee1c 422 int const x_range = static_cast<int>(x1) - static_cast<int>(x0);
ll14zs 0:2211174dee1c 423
ll14zs 0:2211174dee1c 424 // if dotted line, set step to 2, else step is 1
ll14zs 0:2211174dee1c 425 unsigned int const step = (type==2) ? 2:1;
ll14zs 0:2211174dee1c 426
ll14zs 0:2211174dee1c 427 // make sure we loop over the largest range to get the most pixels on the display
ll14zs 0:2211174dee1c 428 // for instance, if drawing a vertical line (x_range = 0), we need to loop down the y pixels
ll14zs 0:2211174dee1c 429 // or else we'll only end up with 1 pixel in the x column
ll14zs 0:2211174dee1c 430 if ( abs(x_range) > abs(y_range) ) {
ll14zs 0:2211174dee1c 431
ll14zs 0:2211174dee1c 432 // ensure we loop from smallest to largest or else for-loop won't run as expected
ll14zs 0:2211174dee1c 433 unsigned int const start = x_range > 0 ? x0:x1;
ll14zs 0:2211174dee1c 434 unsigned int const stop = x_range > 0 ? x1:x0;
ll14zs 0:2211174dee1c 435
ll14zs 0:2211174dee1c 436 // loop between x pixels
ll14zs 0:2211174dee1c 437 for (unsigned int x = start; x<= stop ; x+=step) {
ll14zs 0:2211174dee1c 438 // do linear interpolation
ll14zs 0:2211174dee1c 439 int const dx = static_cast<int>(x)-static_cast<int>(x0);
ll14zs 0:2211174dee1c 440 unsigned int const y = y0 + y_range * dx / x_range;
ll14zs 0:2211174dee1c 441
ll14zs 0:2211174dee1c 442 // If the line type is '0', this will clear the pixel
ll14zs 0:2211174dee1c 443 // If it is '1' or '2', the pixel will be set
ll14zs 0:2211174dee1c 444 setPixel(x,y, type);
ll14zs 0:2211174dee1c 445 }
ll14zs 0:2211174dee1c 446 } else {
ll14zs 0:2211174dee1c 447
ll14zs 0:2211174dee1c 448 // ensure we loop from smallest to largest or else for-loop won't run as expected
ll14zs 0:2211174dee1c 449 unsigned int const start = y_range > 0 ? y0:y1;
ll14zs 0:2211174dee1c 450 unsigned int const stop = y_range > 0 ? y1:y0;
ll14zs 0:2211174dee1c 451
ll14zs 0:2211174dee1c 452 for (unsigned int y = start; y<= stop ; y+=step) {
ll14zs 0:2211174dee1c 453 // do linear interpolation
ll14zs 0:2211174dee1c 454 int const dy = static_cast<int>(y)-static_cast<int>(y0);
ll14zs 0:2211174dee1c 455 unsigned int const x = x0 + x_range * dy / y_range;
ll14zs 0:2211174dee1c 456
ll14zs 0:2211174dee1c 457 // If the line type is '0', this will clear the pixel
ll14zs 0:2211174dee1c 458 // If it is '1' or '2', the pixel will be set
ll14zs 0:2211174dee1c 459 setPixel(x,y, type);
ll14zs 0:2211174dee1c 460 }
ll14zs 0:2211174dee1c 461 }
ll14zs 0:2211174dee1c 462
ll14zs 0:2211174dee1c 463 }
ll14zs 0:2211174dee1c 464
ll14zs 0:2211174dee1c 465 void N5110::drawRect(unsigned int const x0,
ll14zs 0:2211174dee1c 466 unsigned int const y0,
ll14zs 0:2211174dee1c 467 unsigned int const width,
ll14zs 0:2211174dee1c 468 unsigned int const height,
ll14zs 0:2211174dee1c 469 FillType const fill)
ll14zs 0:2211174dee1c 470 {
ll14zs 0:2211174dee1c 471 if (fill == FILL_TRANSPARENT) { // transparent, just outline
ll14zs 0:2211174dee1c 472 drawLine(x0,y0,x0+(width-1),y0,1); // top
ll14zs 0:2211174dee1c 473 drawLine(x0,y0+(height-1),x0+(width-1),y0+(height-1),1); // bottom
ll14zs 0:2211174dee1c 474 drawLine(x0,y0,x0,y0+(height-1),1); // left
ll14zs 0:2211174dee1c 475 drawLine(x0+(width-1),y0,x0+(width-1),y0+(height-1),1); // right
ll14zs 0:2211174dee1c 476 } else { // filled rectangle
ll14zs 0:2211174dee1c 477 int type = (fill==FILL_BLACK) ? 1:0; // black or white fill
ll14zs 0:2211174dee1c 478 for (int y = y0; y<y0+height; y++) { // loop through rows of rectangle
ll14zs 0:2211174dee1c 479 drawLine(x0,y,x0+(width-1),y,type); // draw line across screen
ll14zs 0:2211174dee1c 480 }
ll14zs 0:2211174dee1c 481 }
ll14zs 0:2211174dee1c 482 }
ll14zs 0:2211174dee1c 483
ll14zs 0:2211174dee1c 484 void N5110::drawSprite(int x0,
ll14zs 0:2211174dee1c 485 int y0,
ll14zs 0:2211174dee1c 486 int nrows,
ll14zs 0:2211174dee1c 487 int ncols,
ll14zs 0:2211174dee1c 488 int *sprite)
ll14zs 0:2211174dee1c 489 {
ll14zs 0:2211174dee1c 490 for (int i = 0; i < nrows; i++) {
ll14zs 0:2211174dee1c 491 for (int j = 0 ; j < ncols ; j++) {
ll14zs 0:2211174dee1c 492
ll14zs 0:2211174dee1c 493 int pixel = *((sprite+i*ncols)+j);
ll14zs 0:2211174dee1c 494 setPixel(x0+j,y0+i, pixel);
ll14zs 0:2211174dee1c 495 }
ll14zs 0:2211174dee1c 496 }
ll14zs 0:2211174dee1c 497 }