ELEC2645 (2018/19) / Mbed 2 deprecated el17aio

Ikenna Adrian Ozoemena 201157039

Dependencies:   mbed

N5110/N5110.cpp@0:0d446aab48a6, 2019-02-20 (annotated)

Committer:
ikenna1
Date:
Wed Feb 20 11:50:27 2019 +0000
Revision:
0:0d446aab48a6
Initial Commit;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ikenna1 0:0d446aab48a6 1 #include "mbed.h"
ikenna1 0:0d446aab48a6 2 #include "N5110.h"
ikenna1 0:0d446aab48a6 3
ikenna1 0:0d446aab48a6 4 // overloaded constructor includes power pin - LCD Vcc connected to GPIO pin
ikenna1 0:0d446aab48a6 5 // this constructor works fine with LPC1768 - enough current sourced from GPIO
ikenna1 0:0d446aab48a6 6 // to power LCD. Doesn't work well with K64F.
ikenna1 0:0d446aab48a6 7 N5110::N5110(PinName const pwrPin,
ikenna1 0:0d446aab48a6 8 PinName const scePin,
ikenna1 0:0d446aab48a6 9 PinName const rstPin,
ikenna1 0:0d446aab48a6 10 PinName const dcPin,
ikenna1 0:0d446aab48a6 11 PinName const mosiPin,
ikenna1 0:0d446aab48a6 12 PinName const sclkPin,
ikenna1 0:0d446aab48a6 13 PinName const ledPin)
ikenna1 0:0d446aab48a6 14 :
ikenna1 0:0d446aab48a6 15 _spi(new SPI(mosiPin,NC,sclkPin)), // create new SPI instance and initialise
ikenna1 0:0d446aab48a6 16 _led(new PwmOut(ledPin)),
ikenna1 0:0d446aab48a6 17 _pwr(new DigitalOut(pwrPin)),
ikenna1 0:0d446aab48a6 18 _sce(new DigitalOut(scePin)),
ikenna1 0:0d446aab48a6 19 _rst(new DigitalOut(rstPin)),
ikenna1 0:0d446aab48a6 20 _dc(new DigitalOut(dcPin))
ikenna1 0:0d446aab48a6 21 {}
ikenna1 0:0d446aab48a6 22
ikenna1 0:0d446aab48a6 23 // overloaded constructor does not include power pin - LCD Vcc must be tied to +3V3
ikenna1 0:0d446aab48a6 24 // Best to use this with K64F as the GPIO hasn't sufficient output current to reliably
ikenna1 0:0d446aab48a6 25 // drive the LCD.
ikenna1 0:0d446aab48a6 26 N5110::N5110(PinName const scePin,
ikenna1 0:0d446aab48a6 27 PinName const rstPin,
ikenna1 0:0d446aab48a6 28 PinName const dcPin,
ikenna1 0:0d446aab48a6 29 PinName const mosiPin,
ikenna1 0:0d446aab48a6 30 PinName const sclkPin,
ikenna1 0:0d446aab48a6 31 PinName const ledPin)
ikenna1 0:0d446aab48a6 32 :
ikenna1 0:0d446aab48a6 33 _spi(new SPI(mosiPin,NC,sclkPin)), // create new SPI instance and initialise
ikenna1 0:0d446aab48a6 34 _led(new PwmOut(ledPin)),
ikenna1 0:0d446aab48a6 35 _pwr(NULL), // pwr not needed so null it to be safe
ikenna1 0:0d446aab48a6 36 _sce(new DigitalOut(scePin)),
ikenna1 0:0d446aab48a6 37 _rst(new DigitalOut(rstPin)),
ikenna1 0:0d446aab48a6 38 _dc(new DigitalOut(dcPin))
ikenna1 0:0d446aab48a6 39 {}
ikenna1 0:0d446aab48a6 40
ikenna1 0:0d446aab48a6 41 N5110::~N5110()
ikenna1 0:0d446aab48a6 42 {
ikenna1 0:0d446aab48a6 43 delete _spi;
ikenna1 0:0d446aab48a6 44
ikenna1 0:0d446aab48a6 45 if(_pwr) {
ikenna1 0:0d446aab48a6 46 delete _pwr;
ikenna1 0:0d446aab48a6 47 }
ikenna1 0:0d446aab48a6 48
ikenna1 0:0d446aab48a6 49 delete _led;
ikenna1 0:0d446aab48a6 50 delete _sce;
ikenna1 0:0d446aab48a6 51 delete _rst;
ikenna1 0:0d446aab48a6 52 delete _dc;
ikenna1 0:0d446aab48a6 53 }
ikenna1 0:0d446aab48a6 54
ikenna1 0:0d446aab48a6 55 // initialise function - powers up and sends the initialisation commands
ikenna1 0:0d446aab48a6 56 void N5110::init()
ikenna1 0:0d446aab48a6 57 {
ikenna1 0:0d446aab48a6 58 turnOn(); // power up
ikenna1 0:0d446aab48a6 59 reset(); // reset LCD - must be done within 100 ms
ikenna1 0:0d446aab48a6 60 initSPI();
ikenna1 0:0d446aab48a6 61
ikenna1 0:0d446aab48a6 62 setContrast(0.55); // this may need tuning (say 0.4 to 0.6)
ikenna1 0:0d446aab48a6 63 setBias(3); // datasheet - 48:1 mux - don't mess with if you don't know what you're doing! (0 to 7)
ikenna1 0:0d446aab48a6 64 setTempCoefficient(0); // datasheet - may need increasing (range 0 to 3) at very low temperatures
ikenna1 0:0d446aab48a6 65 normalMode(); // normal video mode by default
ikenna1 0:0d446aab48a6 66
ikenna1 0:0d446aab48a6 67 clearRAM(); // RAM is undefined at power-up so clear to be sure
ikenna1 0:0d446aab48a6 68 clear(); // clear buffer
ikenna1 0:0d446aab48a6 69 setBrightness(0.5);
ikenna1 0:0d446aab48a6 70 }
ikenna1 0:0d446aab48a6 71
ikenna1 0:0d446aab48a6 72 // sets normal video mode (black on white)
ikenna1 0:0d446aab48a6 73 void N5110::normalMode()
ikenna1 0:0d446aab48a6 74 {
ikenna1 0:0d446aab48a6 75 sendCommand(0b00100000); // basic instruction
ikenna1 0:0d446aab48a6 76 sendCommand(0b00001100); // normal video mode- datasheet
ikenna1 0:0d446aab48a6 77 }
ikenna1 0:0d446aab48a6 78
ikenna1 0:0d446aab48a6 79 // sets normal video mode (white on black)
ikenna1 0:0d446aab48a6 80 void N5110::inverseMode()
ikenna1 0:0d446aab48a6 81 {
ikenna1 0:0d446aab48a6 82 sendCommand(0b00100000); // basic instruction
ikenna1 0:0d446aab48a6 83 sendCommand(0b00001101); // inverse video mode - datasheet
ikenna1 0:0d446aab48a6 84 }
ikenna1 0:0d446aab48a6 85
ikenna1 0:0d446aab48a6 86 // function to power up the LCD and backlight - only works when using GPIO to power
ikenna1 0:0d446aab48a6 87 void N5110::turnOn()
ikenna1 0:0d446aab48a6 88 {
ikenna1 0:0d446aab48a6 89 if (_pwr != NULL) {
ikenna1 0:0d446aab48a6 90 _pwr->write(1); // apply power
ikenna1 0:0d446aab48a6 91 }
ikenna1 0:0d446aab48a6 92 }
ikenna1 0:0d446aab48a6 93
ikenna1 0:0d446aab48a6 94 // function to power down LCD
ikenna1 0:0d446aab48a6 95 void N5110::turnOff()
ikenna1 0:0d446aab48a6 96 {
ikenna1 0:0d446aab48a6 97 clear(); // clear buffer
ikenna1 0:0d446aab48a6 98 refresh();
ikenna1 0:0d446aab48a6 99 setBrightness(0.0); // turn backlight off
ikenna1 0:0d446aab48a6 100 clearRAM(); // clear RAM to ensure specified current consumption
ikenna1 0:0d446aab48a6 101 // send command to ensure we are in basic mode
ikenna1 0:0d446aab48a6 102
ikenna1 0:0d446aab48a6 103 sendCommand(0b00100000); // basic mode
ikenna1 0:0d446aab48a6 104 sendCommand(0b00001000); // clear display
ikenna1 0:0d446aab48a6 105 sendCommand(0b00100001); // extended mode
ikenna1 0:0d446aab48a6 106 sendCommand(0b00100100); // power down
ikenna1 0:0d446aab48a6 107
ikenna1 0:0d446aab48a6 108 // if we are powering the LCD using the GPIO then make it low to turn off
ikenna1 0:0d446aab48a6 109 if (_pwr != NULL) {
ikenna1 0:0d446aab48a6 110 wait_ms(10); // small delay and then turn off the power pin
ikenna1 0:0d446aab48a6 111 _pwr->write(0); // turn off power
ikenna1 0:0d446aab48a6 112 }
ikenna1 0:0d446aab48a6 113
ikenna1 0:0d446aab48a6 114 }
ikenna1 0:0d446aab48a6 115
ikenna1 0:0d446aab48a6 116 // function to change LED backlight brightness
ikenna1 0:0d446aab48a6 117 void N5110::setBrightness(float brightness)
ikenna1 0:0d446aab48a6 118 {
ikenna1 0:0d446aab48a6 119 // check whether brightness is within range
ikenna1 0:0d446aab48a6 120 if (brightness < 0.0f)
ikenna1 0:0d446aab48a6 121 brightness = 0.0f;
ikenna1 0:0d446aab48a6 122 if (brightness > 1.0f)
ikenna1 0:0d446aab48a6 123 brightness = 1.0f;
ikenna1 0:0d446aab48a6 124 // set PWM duty cycle
ikenna1 0:0d446aab48a6 125 _led->write(brightness);
ikenna1 0:0d446aab48a6 126 }
ikenna1 0:0d446aab48a6 127
ikenna1 0:0d446aab48a6 128 void N5110::setContrast(float contrast) {
ikenna1 0:0d446aab48a6 129
ikenna1 0:0d446aab48a6 130 // enforce limits
ikenna1 0:0d446aab48a6 131 if (contrast > 1.0f)
ikenna1 0:0d446aab48a6 132 contrast = 1.0f;
ikenna1 0:0d446aab48a6 133 else if (contrast < 0.0f)
ikenna1 0:0d446aab48a6 134 contrast = 0.0;
ikenna1 0:0d446aab48a6 135
ikenna1 0:0d446aab48a6 136 // convert to char in range 0 to 127 (i.e. 6 bits)
ikenna1 0:0d446aab48a6 137 char ic = char(contrast*127.0f);
ikenna1 0:0d446aab48a6 138
ikenna1 0:0d446aab48a6 139 sendCommand(0b00100001); // extended instruction set
ikenna1 0:0d446aab48a6 140 sendCommand(0b10000000 | ic); // set Vop (which controls contrast)
ikenna1 0:0d446aab48a6 141 sendCommand(0b00100000); // back to basic instruction set
ikenna1 0:0d446aab48a6 142 }
ikenna1 0:0d446aab48a6 143
ikenna1 0:0d446aab48a6 144 void N5110::setTempCoefficient(char tc) {
ikenna1 0:0d446aab48a6 145
ikenna1 0:0d446aab48a6 146 // enforce limits
ikenna1 0:0d446aab48a6 147 if (tc>3) {
ikenna1 0:0d446aab48a6 148 tc=3;
ikenna1 0:0d446aab48a6 149 }
ikenna1 0:0d446aab48a6 150
ikenna1 0:0d446aab48a6 151 // temperature coefficient may need increasing at low temperatures
ikenna1 0:0d446aab48a6 152
ikenna1 0:0d446aab48a6 153 sendCommand(0b00100001); // extended instruction set
ikenna1 0:0d446aab48a6 154 sendCommand(0b00000100 | tc);
ikenna1 0:0d446aab48a6 155 sendCommand(0b00100000); // back to basic instruction set
ikenna1 0:0d446aab48a6 156 }
ikenna1 0:0d446aab48a6 157
ikenna1 0:0d446aab48a6 158 void N5110::setBias(char bias) {
ikenna1 0:0d446aab48a6 159
ikenna1 0:0d446aab48a6 160 // from data sheet
ikenna1 0:0d446aab48a6 161 // bias mux rate
ikenna1 0:0d446aab48a6 162 // 0 1:100
ikenna1 0:0d446aab48a6 163 // 1 1:80
ikenna1 0:0d446aab48a6 164 // 2 1:65
ikenna1 0:0d446aab48a6 165 // 3 1:48 (default)
ikenna1 0:0d446aab48a6 166 // 4 1:40/1:34
ikenna1 0:0d446aab48a6 167 // 5 1:24
ikenna1 0:0d446aab48a6 168 // 6 1:18/1:16
ikenna1 0:0d446aab48a6 169 // 7 1:10/1:9/1:8
ikenna1 0:0d446aab48a6 170
ikenna1 0:0d446aab48a6 171 // enforce limits
ikenna1 0:0d446aab48a6 172 if (bias>7) {
ikenna1 0:0d446aab48a6 173 bias=7;
ikenna1 0:0d446aab48a6 174 }
ikenna1 0:0d446aab48a6 175
ikenna1 0:0d446aab48a6 176 sendCommand(0b00100001); // extended mode instruction
ikenna1 0:0d446aab48a6 177 sendCommand(0b00010000 | bias);
ikenna1 0:0d446aab48a6 178 sendCommand(0b00100000); // end of extended mode instruction
ikenna1 0:0d446aab48a6 179 }
ikenna1 0:0d446aab48a6 180
ikenna1 0:0d446aab48a6 181 // pulse the active low reset line
ikenna1 0:0d446aab48a6 182 void N5110::reset()
ikenna1 0:0d446aab48a6 183 {
ikenna1 0:0d446aab48a6 184 _rst->write(0); // reset the LCD
ikenna1 0:0d446aab48a6 185 _rst->write(1);
ikenna1 0:0d446aab48a6 186 }
ikenna1 0:0d446aab48a6 187
ikenna1 0:0d446aab48a6 188 // function to initialise SPI peripheral
ikenna1 0:0d446aab48a6 189 void N5110::initSPI()
ikenna1 0:0d446aab48a6 190 {
ikenna1 0:0d446aab48a6 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
ikenna1 0:0d446aab48a6 192 _spi->frequency(4000000); // maximum of screen is 4 MHz
ikenna1 0:0d446aab48a6 193 }
ikenna1 0:0d446aab48a6 194
ikenna1 0:0d446aab48a6 195 // send a command to the display
ikenna1 0:0d446aab48a6 196 void N5110::sendCommand(unsigned char command)
ikenna1 0:0d446aab48a6 197 {
ikenna1 0:0d446aab48a6 198 _dc->write(0); // set DC low for command
ikenna1 0:0d446aab48a6 199 _sce->write(0); // set CE low to begin frame
ikenna1 0:0d446aab48a6 200 _spi->write(command); // send command
ikenna1 0:0d446aab48a6 201 _dc->write(1); // turn back to data by default
ikenna1 0:0d446aab48a6 202 _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
ikenna1 0:0d446aab48a6 203 }
ikenna1 0:0d446aab48a6 204
ikenna1 0:0d446aab48a6 205 // send data to the display at the current XY address
ikenna1 0:0d446aab48a6 206 // dc is set to 1 (i.e. data) after sending a command and so should
ikenna1 0:0d446aab48a6 207 // be the default mode.
ikenna1 0:0d446aab48a6 208 void N5110::sendData(unsigned char data)
ikenna1 0:0d446aab48a6 209 {
ikenna1 0:0d446aab48a6 210 _sce->write(0); // set CE low to begin frame
ikenna1 0:0d446aab48a6 211 _spi->write(data);
ikenna1 0:0d446aab48a6 212 _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
ikenna1 0:0d446aab48a6 213 }
ikenna1 0:0d446aab48a6 214
ikenna1 0:0d446aab48a6 215 // this function writes 0 to the 504 bytes to clear the RAM
ikenna1 0:0d446aab48a6 216 void N5110::clearRAM()
ikenna1 0:0d446aab48a6 217 {
ikenna1 0:0d446aab48a6 218 _sce->write(0); //set CE low to begin frame
ikenna1 0:0d446aab48a6 219 for(int i = 0; i < WIDTH * HEIGHT; i++) { // 48 x 84 bits = 504 bytes
ikenna1 0:0d446aab48a6 220 _spi->write(0x00); // send 0's
ikenna1 0:0d446aab48a6 221 }
ikenna1 0:0d446aab48a6 222 _sce->write(1); // set CE high to end frame
ikenna1 0:0d446aab48a6 223 }
ikenna1 0:0d446aab48a6 224
ikenna1 0:0d446aab48a6 225 // function to set the XY address in RAM for subsequenct data write
ikenna1 0:0d446aab48a6 226 void N5110::setXYAddress(unsigned int const x,
ikenna1 0:0d446aab48a6 227 unsigned int const y)
ikenna1 0:0d446aab48a6 228 {
ikenna1 0:0d446aab48a6 229 if (x<WIDTH && y<HEIGHT) { // check within range
ikenna1 0:0d446aab48a6 230 sendCommand(0b00100000); // basic instruction
ikenna1 0:0d446aab48a6 231 sendCommand(0b10000000 | x); // send addresses to display with relevant mask
ikenna1 0:0d446aab48a6 232 sendCommand(0b01000000 | y);
ikenna1 0:0d446aab48a6 233 }
ikenna1 0:0d446aab48a6 234 }
ikenna1 0:0d446aab48a6 235
ikenna1 0:0d446aab48a6 236 // These functions are used to set, clear and get the value of pixels in the display
ikenna1 0:0d446aab48a6 237 // Pixels are addressed in the range of 0 to 47 (y) and 0 to 83 (x). The refresh()
ikenna1 0:0d446aab48a6 238 // function must be called after set and clear in order to update the display
ikenna1 0:0d446aab48a6 239 void N5110::setPixel(unsigned int const x,
ikenna1 0:0d446aab48a6 240 unsigned int const y,
ikenna1 0:0d446aab48a6 241 bool const state)
ikenna1 0:0d446aab48a6 242 {
ikenna1 0:0d446aab48a6 243 if (x<WIDTH && y<HEIGHT) { // check within range
ikenna1 0:0d446aab48a6 244 // calculate bank and shift 1 to required position in the data byte
ikenna1 0:0d446aab48a6 245 if(state) buffer[x][y/8] |= (1 << y%8);
ikenna1 0:0d446aab48a6 246 else buffer[x][y/8] &= ~(1 << y%8);
ikenna1 0:0d446aab48a6 247 }
ikenna1 0:0d446aab48a6 248 }
ikenna1 0:0d446aab48a6 249
ikenna1 0:0d446aab48a6 250 void N5110::clearPixel(unsigned int const x,
ikenna1 0:0d446aab48a6 251 unsigned int const y)
ikenna1 0:0d446aab48a6 252 {
ikenna1 0:0d446aab48a6 253 if (x<WIDTH && y<HEIGHT) { // check within range
ikenna1 0:0d446aab48a6 254 // calculate bank and shift 1 to required position (using bit clear)
ikenna1 0:0d446aab48a6 255 buffer[x][y/8] &= ~(1 << y%8);
ikenna1 0:0d446aab48a6 256 }
ikenna1 0:0d446aab48a6 257 }
ikenna1 0:0d446aab48a6 258
ikenna1 0:0d446aab48a6 259 int N5110::getPixel(unsigned int const x,
ikenna1 0:0d446aab48a6 260 unsigned int const y) const
ikenna1 0:0d446aab48a6 261 {
ikenna1 0:0d446aab48a6 262 if (x<WIDTH && y<HEIGHT) { // check within range
ikenna1 0:0d446aab48a6 263 // return relevant bank and mask required bit
ikenna1 0:0d446aab48a6 264
ikenna1 0:0d446aab48a6 265 int pixel = (int) buffer[x][y/8] & (1 << y%8);
ikenna1 0:0d446aab48a6 266
ikenna1 0:0d446aab48a6 267 if (pixel)
ikenna1 0:0d446aab48a6 268 return 1;
ikenna1 0:0d446aab48a6 269 else
ikenna1 0:0d446aab48a6 270 return 0;
ikenna1 0:0d446aab48a6 271 }
ikenna1 0:0d446aab48a6 272
ikenna1 0:0d446aab48a6 273 return 0;
ikenna1 0:0d446aab48a6 274
ikenna1 0:0d446aab48a6 275 }
ikenna1 0:0d446aab48a6 276
ikenna1 0:0d446aab48a6 277 // function to refresh the display
ikenna1 0:0d446aab48a6 278 void N5110::refresh()
ikenna1 0:0d446aab48a6 279 {
ikenna1 0:0d446aab48a6 280 setXYAddress(0,0); // important to set address back to 0,0 before refreshing display
ikenna1 0:0d446aab48a6 281 // address auto increments after printing string, so buffer[0][0] will not coincide
ikenna1 0:0d446aab48a6 282 // with top-left pixel after priting string
ikenna1 0:0d446aab48a6 283
ikenna1 0:0d446aab48a6 284 _sce->write(0); //set CE low to begin frame
ikenna1 0:0d446aab48a6 285
ikenna1 0:0d446aab48a6 286 for(int j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
ikenna1 0:0d446aab48a6 287 for(int i = 0; i < WIDTH; i++) {
ikenna1 0:0d446aab48a6 288 _spi->write(buffer[i][j]); // send buffer
ikenna1 0:0d446aab48a6 289 }
ikenna1 0:0d446aab48a6 290 }
ikenna1 0:0d446aab48a6 291 _sce->write(1); // set CE high to end frame
ikenna1 0:0d446aab48a6 292
ikenna1 0:0d446aab48a6 293 }
ikenna1 0:0d446aab48a6 294
ikenna1 0:0d446aab48a6 295 // fills the buffer with random bytes. Can be used to test the display.
ikenna1 0:0d446aab48a6 296 // The rand() function isn't seeded so it probably creates the same pattern everytime
ikenna1 0:0d446aab48a6 297 void N5110::randomiseBuffer()
ikenna1 0:0d446aab48a6 298 {
ikenna1 0:0d446aab48a6 299 int i,j;
ikenna1 0:0d446aab48a6 300 for(j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
ikenna1 0:0d446aab48a6 301 for(i = 0; i < WIDTH; i++) {
ikenna1 0:0d446aab48a6 302 buffer[i][j] = rand()%256; // generate random byte
ikenna1 0:0d446aab48a6 303 }
ikenna1 0:0d446aab48a6 304 }
ikenna1 0:0d446aab48a6 305
ikenna1 0:0d446aab48a6 306 }
ikenna1 0:0d446aab48a6 307
ikenna1 0:0d446aab48a6 308 // function to print 5x7 font
ikenna1 0:0d446aab48a6 309 void N5110::printChar(char const c,
ikenna1 0:0d446aab48a6 310 unsigned int const x,
ikenna1 0:0d446aab48a6 311 unsigned int const y)
ikenna1 0:0d446aab48a6 312 {
ikenna1 0:0d446aab48a6 313 if (y<BANKS) { // check if printing in range of y banks
ikenna1 0:0d446aab48a6 314
ikenna1 0:0d446aab48a6 315 for (int i = 0; i < 5 ; i++ ) {
ikenna1 0:0d446aab48a6 316 int pixel_x = x+i;
ikenna1 0:0d446aab48a6 317 if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83)
ikenna1 0:0d446aab48a6 318 break;
ikenna1 0:0d446aab48a6 319 buffer[pixel_x][y] = font5x7[(c - 32)*5 + i];
ikenna1 0:0d446aab48a6 320 // array is offset by 32 relative to ASCII, each character is 5 pixels wide
ikenna1 0:0d446aab48a6 321 }
ikenna1 0:0d446aab48a6 322
ikenna1 0:0d446aab48a6 323 }
ikenna1 0:0d446aab48a6 324 }
ikenna1 0:0d446aab48a6 325
ikenna1 0:0d446aab48a6 326 // function to print string at specified position
ikenna1 0:0d446aab48a6 327 void N5110::printString(const char *str,
ikenna1 0:0d446aab48a6 328 unsigned int const x,
ikenna1 0:0d446aab48a6 329 unsigned int const y)
ikenna1 0:0d446aab48a6 330 {
ikenna1 0:0d446aab48a6 331 if (y<BANKS) { // check if printing in range of y banks
ikenna1 0:0d446aab48a6 332
ikenna1 0:0d446aab48a6 333 int n = 0 ; // counter for number of characters in string
ikenna1 0:0d446aab48a6 334 // loop through string and print character
ikenna1 0:0d446aab48a6 335 while(*str) {
ikenna1 0:0d446aab48a6 336
ikenna1 0:0d446aab48a6 337 // writes the character bitmap data to the buffer, so that
ikenna1 0:0d446aab48a6 338 // text and pixels can be displayed at the same time
ikenna1 0:0d446aab48a6 339 for (int i = 0; i < 5 ; i++ ) {
ikenna1 0:0d446aab48a6 340 int pixel_x = x+i+n*6;
ikenna1 0:0d446aab48a6 341 if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83)
ikenna1 0:0d446aab48a6 342 break;
ikenna1 0:0d446aab48a6 343 buffer[pixel_x][y] = font5x7[(*str - 32)*5 + i];
ikenna1 0:0d446aab48a6 344 }
ikenna1 0:0d446aab48a6 345 str++; // go to next character in string
ikenna1 0:0d446aab48a6 346 n++; // increment index
ikenna1 0:0d446aab48a6 347 }
ikenna1 0:0d446aab48a6 348 }
ikenna1 0:0d446aab48a6 349 }
ikenna1 0:0d446aab48a6 350
ikenna1 0:0d446aab48a6 351 // function to clear the screen buffer
ikenna1 0:0d446aab48a6 352 void N5110::clear()
ikenna1 0:0d446aab48a6 353 {
ikenna1 0:0d446aab48a6 354 memset(buffer,0,sizeof(buffer));
ikenna1 0:0d446aab48a6 355 }
ikenna1 0:0d446aab48a6 356
ikenna1 0:0d446aab48a6 357 // function to plot array on display
ikenna1 0:0d446aab48a6 358 void N5110::plotArray(float const array[])
ikenna1 0:0d446aab48a6 359 {
ikenna1 0:0d446aab48a6 360 for (int i=0; i<WIDTH; i++) { // loop through array
ikenna1 0:0d446aab48a6 361 // elements are normalised from 0.0 to 1.0, so multiply
ikenna1 0:0d446aab48a6 362 // by 47 to convert to pixel range, and subtract from 47
ikenna1 0:0d446aab48a6 363 // since top-left is 0,0 in the display geometry
ikenna1 0:0d446aab48a6 364 setPixel(i,47 - int(array[i]*47.0f),true);
ikenna1 0:0d446aab48a6 365 }
ikenna1 0:0d446aab48a6 366
ikenna1 0:0d446aab48a6 367 }
ikenna1 0:0d446aab48a6 368
ikenna1 0:0d446aab48a6 369 // function to draw circle
ikenna1 0:0d446aab48a6 370 void N5110:: drawCircle(unsigned int const x0,
ikenna1 0:0d446aab48a6 371 unsigned int const y0,
ikenna1 0:0d446aab48a6 372 unsigned int const radius,
ikenna1 0:0d446aab48a6 373 FillType const fill)
ikenna1 0:0d446aab48a6 374 {
ikenna1 0:0d446aab48a6 375 // from http://en.wikipedia.org/wiki/Midpoint_circle_algorithm
ikenna1 0:0d446aab48a6 376 int x = radius;
ikenna1 0:0d446aab48a6 377 int y = 0;
ikenna1 0:0d446aab48a6 378 int radiusError = 1-x;
ikenna1 0:0d446aab48a6 379
ikenna1 0:0d446aab48a6 380 while(x >= y) {
ikenna1 0:0d446aab48a6 381
ikenna1 0:0d446aab48a6 382 // if transparent, just draw outline
ikenna1 0:0d446aab48a6 383 if (fill == FILL_TRANSPARENT) {
ikenna1 0:0d446aab48a6 384 setPixel( x + x0, y + y0,true);
ikenna1 0:0d446aab48a6 385 setPixel(-x + x0, y + y0,true);
ikenna1 0:0d446aab48a6 386 setPixel( y + x0, x + y0,true);
ikenna1 0:0d446aab48a6 387 setPixel(-y + x0, x + y0,true);
ikenna1 0:0d446aab48a6 388 setPixel(-y + x0, -x + y0,true);
ikenna1 0:0d446aab48a6 389 setPixel( y + x0, -x + y0,true);
ikenna1 0:0d446aab48a6 390 setPixel( x + x0, -y + y0,true);
ikenna1 0:0d446aab48a6 391 setPixel(-x + x0, -y + y0,true);
ikenna1 0:0d446aab48a6 392 } else { // drawing filled circle, so draw lines between points at same y value
ikenna1 0:0d446aab48a6 393
ikenna1 0:0d446aab48a6 394 int type = (fill==FILL_BLACK) ? 1:0; // black or white fill
ikenna1 0:0d446aab48a6 395
ikenna1 0:0d446aab48a6 396 drawLine(x+x0,y+y0,-x+x0,y+y0,type);
ikenna1 0:0d446aab48a6 397 drawLine(y+x0,x+y0,-y+x0,x+y0,type);
ikenna1 0:0d446aab48a6 398 drawLine(y+x0,-x+y0,-y+x0,-x+y0,type);
ikenna1 0:0d446aab48a6 399 drawLine(x+x0,-y+y0,-x+x0,-y+y0,type);
ikenna1 0:0d446aab48a6 400 }
ikenna1 0:0d446aab48a6 401
ikenna1 0:0d446aab48a6 402 y++;
ikenna1 0:0d446aab48a6 403 if (radiusError<0) {
ikenna1 0:0d446aab48a6 404 radiusError += 2 * y + 1;
ikenna1 0:0d446aab48a6 405 } else {
ikenna1 0:0d446aab48a6 406 x--;
ikenna1 0:0d446aab48a6 407 radiusError += 2 * (y - x) + 1;
ikenna1 0:0d446aab48a6 408 }
ikenna1 0:0d446aab48a6 409 }
ikenna1 0:0d446aab48a6 410
ikenna1 0:0d446aab48a6 411 }
ikenna1 0:0d446aab48a6 412
ikenna1 0:0d446aab48a6 413 void N5110::drawLine(unsigned int const x0,
ikenna1 0:0d446aab48a6 414 unsigned int const y0,
ikenna1 0:0d446aab48a6 415 unsigned int const x1,
ikenna1 0:0d446aab48a6 416 unsigned int const y1,
ikenna1 0:0d446aab48a6 417 unsigned int const type)
ikenna1 0:0d446aab48a6 418 {
ikenna1 0:0d446aab48a6 419 // Note that the ranges can be negative so we have to turn the input values
ikenna1 0:0d446aab48a6 420 // into signed integers first
ikenna1 0:0d446aab48a6 421 int const y_range = static_cast<int>(y1) - static_cast<int>(y0);
ikenna1 0:0d446aab48a6 422 int const x_range = static_cast<int>(x1) - static_cast<int>(x0);
ikenna1 0:0d446aab48a6 423
ikenna1 0:0d446aab48a6 424 // if dotted line, set step to 2, else step is 1
ikenna1 0:0d446aab48a6 425 unsigned int const step = (type==2) ? 2:1;
ikenna1 0:0d446aab48a6 426
ikenna1 0:0d446aab48a6 427 // make sure we loop over the largest range to get the most pixels on the display
ikenna1 0:0d446aab48a6 428 // for instance, if drawing a vertical line (x_range = 0), we need to loop down the y pixels
ikenna1 0:0d446aab48a6 429 // or else we'll only end up with 1 pixel in the x column
ikenna1 0:0d446aab48a6 430 if ( abs(x_range) > abs(y_range) ) {
ikenna1 0:0d446aab48a6 431
ikenna1 0:0d446aab48a6 432 // ensure we loop from smallest to largest or else for-loop won't run as expected
ikenna1 0:0d446aab48a6 433 unsigned int const start = x_range > 0 ? x0:x1;
ikenna1 0:0d446aab48a6 434 unsigned int const stop = x_range > 0 ? x1:x0;
ikenna1 0:0d446aab48a6 435
ikenna1 0:0d446aab48a6 436 // loop between x pixels
ikenna1 0:0d446aab48a6 437 for (unsigned int x = start; x<= stop ; x+=step) {
ikenna1 0:0d446aab48a6 438 // do linear interpolation
ikenna1 0:0d446aab48a6 439 int const dx = static_cast<int>(x)-static_cast<int>(x0);
ikenna1 0:0d446aab48a6 440 unsigned int const y = y0 + y_range * dx / x_range;
ikenna1 0:0d446aab48a6 441
ikenna1 0:0d446aab48a6 442 // If the line type is '0', this will clear the pixel
ikenna1 0:0d446aab48a6 443 // If it is '1' or '2', the pixel will be set
ikenna1 0:0d446aab48a6 444 setPixel(x,y, type);
ikenna1 0:0d446aab48a6 445 }
ikenna1 0:0d446aab48a6 446 } else {
ikenna1 0:0d446aab48a6 447
ikenna1 0:0d446aab48a6 448 // ensure we loop from smallest to largest or else for-loop won't run as expected
ikenna1 0:0d446aab48a6 449 unsigned int const start = y_range > 0 ? y0:y1;
ikenna1 0:0d446aab48a6 450 unsigned int const stop = y_range > 0 ? y1:y0;
ikenna1 0:0d446aab48a6 451
ikenna1 0:0d446aab48a6 452 for (unsigned int y = start; y<= stop ; y+=step) {
ikenna1 0:0d446aab48a6 453 // do linear interpolation
ikenna1 0:0d446aab48a6 454 int const dy = static_cast<int>(y)-static_cast<int>(y0);
ikenna1 0:0d446aab48a6 455 unsigned int const x = x0 + x_range * dy / y_range;
ikenna1 0:0d446aab48a6 456
ikenna1 0:0d446aab48a6 457 // If the line type is '0', this will clear the pixel
ikenna1 0:0d446aab48a6 458 // If it is '1' or '2', the pixel will be set
ikenna1 0:0d446aab48a6 459 setPixel(x,y, type);
ikenna1 0:0d446aab48a6 460 }
ikenna1 0:0d446aab48a6 461 }
ikenna1 0:0d446aab48a6 462
ikenna1 0:0d446aab48a6 463 }
ikenna1 0:0d446aab48a6 464
ikenna1 0:0d446aab48a6 465 void N5110::drawRect(unsigned int const x0,
ikenna1 0:0d446aab48a6 466 unsigned int const y0,
ikenna1 0:0d446aab48a6 467 unsigned int const width,
ikenna1 0:0d446aab48a6 468 unsigned int const height,
ikenna1 0:0d446aab48a6 469 FillType const fill)
ikenna1 0:0d446aab48a6 470 {
ikenna1 0:0d446aab48a6 471 if (fill == FILL_TRANSPARENT) { // transparent, just outline
ikenna1 0:0d446aab48a6 472 drawLine(x0,y0,x0+(width-1),y0,1); // top
ikenna1 0:0d446aab48a6 473 drawLine(x0,y0+(height-1),x0+(width-1),y0+(height-1),1); // bottom
ikenna1 0:0d446aab48a6 474 drawLine(x0,y0,x0,y0+(height-1),1); // left
ikenna1 0:0d446aab48a6 475 drawLine(x0+(width-1),y0,x0+(width-1),y0+(height-1),1); // right
ikenna1 0:0d446aab48a6 476 } else { // filled rectangle
ikenna1 0:0d446aab48a6 477 int type = (fill==FILL_BLACK) ? 1:0; // black or white fill
ikenna1 0:0d446aab48a6 478 for (int y = y0; y<y0+height; y++) { // loop through rows of rectangle
ikenna1 0:0d446aab48a6 479 drawLine(x0,y,x0+(width-1),y,type); // draw line across screen
ikenna1 0:0d446aab48a6 480 }
ikenna1 0:0d446aab48a6 481 }
ikenna1 0:0d446aab48a6 482 }
ikenna1 0:0d446aab48a6 483
ikenna1 0:0d446aab48a6 484 void N5110::drawSprite(int x0,
ikenna1 0:0d446aab48a6 485 int y0,
ikenna1 0:0d446aab48a6 486 int nrows,
ikenna1 0:0d446aab48a6 487 int ncols,
ikenna1 0:0d446aab48a6 488 int *sprite)
ikenna1 0:0d446aab48a6 489 {
ikenna1 0:0d446aab48a6 490 for (int i = 0; i < nrows; i++) {
ikenna1 0:0d446aab48a6 491 for (int j = 0 ; j < ncols ; j++) {
ikenna1 0:0d446aab48a6 492
ikenna1 0:0d446aab48a6 493 int pixel = *((sprite+i*ncols)+j);
ikenna1 0:0d446aab48a6 494 setPixel(x0+j,y0+i, pixel);
ikenna1 0:0d446aab48a6 495 }
ikenna1 0:0d446aab48a6 496 }
ikenna1 0:0d446aab48a6 497 }