Josh Davy / Mbed OS Flip_OS_5

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Dependencies:   el17jd

N5110/N5110.cpp@20:0b842eddb176, 2019-07-17 (annotated)

Committer:
joshdavy
Date:
Wed Jul 17 11:49:07 2019 +0000
Revision:
20:0b842eddb176
Parent:
0:4916a63a6cbf 
Test;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
joshdavy 0:4916a63a6cbf 1 #include "mbed.h"
joshdavy 0:4916a63a6cbf 2 #include "N5110.h"
joshdavy 0:4916a63a6cbf 3
joshdavy 0:4916a63a6cbf 4 // overloaded constructor includes power pin - LCD Vcc connected to GPIO pin
joshdavy 0:4916a63a6cbf 5 // this constructor works fine with LPC1768 - enough current sourced from GPIO
joshdavy 0:4916a63a6cbf 6 // to power LCD. Doesn't work well with K64F.
joshdavy 0:4916a63a6cbf 7 N5110::N5110(PinName const pwrPin,
joshdavy 0:4916a63a6cbf 8 PinName const scePin,
joshdavy 0:4916a63a6cbf 9 PinName const rstPin,
joshdavy 0:4916a63a6cbf 10 PinName const dcPin,
joshdavy 0:4916a63a6cbf 11 PinName const mosiPin,
joshdavy 0:4916a63a6cbf 12 PinName const sclkPin,
joshdavy 0:4916a63a6cbf 13 PinName const ledPin)
joshdavy 0:4916a63a6cbf 14 :
joshdavy 0:4916a63a6cbf 15 _spi(new SPI(mosiPin,NC,sclkPin)), // create new SPI instance and initialise
joshdavy 0:4916a63a6cbf 16 _led(new PwmOut(ledPin)),
joshdavy 0:4916a63a6cbf 17 _pwr(new DigitalOut(pwrPin)),
joshdavy 0:4916a63a6cbf 18 _sce(new DigitalOut(scePin)),
joshdavy 0:4916a63a6cbf 19 _rst(new DigitalOut(rstPin)),
joshdavy 0:4916a63a6cbf 20 _dc(new DigitalOut(dcPin))
joshdavy 0:4916a63a6cbf 21 {}
joshdavy 0:4916a63a6cbf 22
joshdavy 0:4916a63a6cbf 23 // overloaded constructor does not include power pin - LCD Vcc must be tied to +3V3
joshdavy 0:4916a63a6cbf 24 // Best to use this with K64F as the GPIO hasn't sufficient output current to reliably
joshdavy 0:4916a63a6cbf 25 // drive the LCD.
joshdavy 0:4916a63a6cbf 26 N5110::N5110(PinName const scePin,
joshdavy 0:4916a63a6cbf 27 PinName const rstPin,
joshdavy 0:4916a63a6cbf 28 PinName const dcPin,
joshdavy 0:4916a63a6cbf 29 PinName const mosiPin,
joshdavy 0:4916a63a6cbf 30 PinName const sclkPin,
joshdavy 0:4916a63a6cbf 31 PinName const ledPin)
joshdavy 0:4916a63a6cbf 32 :
joshdavy 0:4916a63a6cbf 33 _spi(new SPI(mosiPin,NC,sclkPin)), // create new SPI instance and initialise
joshdavy 0:4916a63a6cbf 34 _led(new PwmOut(ledPin)),
joshdavy 0:4916a63a6cbf 35 _pwr(NULL), // pwr not needed so null it to be safe
joshdavy 0:4916a63a6cbf 36 _sce(new DigitalOut(scePin)),
joshdavy 0:4916a63a6cbf 37 _rst(new DigitalOut(rstPin)),
joshdavy 0:4916a63a6cbf 38 _dc(new DigitalOut(dcPin))
joshdavy 0:4916a63a6cbf 39 {}
joshdavy 0:4916a63a6cbf 40
joshdavy 0:4916a63a6cbf 41 N5110::~N5110()
joshdavy 0:4916a63a6cbf 42 {
joshdavy 0:4916a63a6cbf 43 delete _spi;
joshdavy 0:4916a63a6cbf 44
joshdavy 0:4916a63a6cbf 45 if(_pwr) {
joshdavy 0:4916a63a6cbf 46 delete _pwr;
joshdavy 0:4916a63a6cbf 47 }
joshdavy 0:4916a63a6cbf 48
joshdavy 0:4916a63a6cbf 49 delete _led;
joshdavy 0:4916a63a6cbf 50 delete _sce;
joshdavy 0:4916a63a6cbf 51 delete _rst;
joshdavy 0:4916a63a6cbf 52 delete _dc;
joshdavy 0:4916a63a6cbf 53 }
joshdavy 0:4916a63a6cbf 54
joshdavy 0:4916a63a6cbf 55 // initialise function - powers up and sends the initialisation commands
joshdavy 0:4916a63a6cbf 56 void N5110::init()
joshdavy 0:4916a63a6cbf 57 {
joshdavy 0:4916a63a6cbf 58 turnOn(); // power up
joshdavy 0:4916a63a6cbf 59 reset(); // reset LCD - must be done within 100 ms
joshdavy 0:4916a63a6cbf 60 initSPI();
joshdavy 0:4916a63a6cbf 61
joshdavy 0:4916a63a6cbf 62 setContrast(0.55); // this may need tuning (say 0.4 to 0.6)
joshdavy 0:4916a63a6cbf 63 setBias(3); // datasheet - 48:1 mux - don't mess with if you don't know what you're doing! (0 to 7)
joshdavy 0:4916a63a6cbf 64 setTempCoefficient(0); // datasheet - may need increasing (range 0 to 3) at very low temperatures
joshdavy 0:4916a63a6cbf 65 normalMode(); // normal video mode by default
joshdavy 0:4916a63a6cbf 66
joshdavy 0:4916a63a6cbf 67 clearRAM(); // RAM is undefined at power-up so clear to be sure
joshdavy 0:4916a63a6cbf 68 clear(); // clear buffer
joshdavy 0:4916a63a6cbf 69 setBrightness(0.5);
joshdavy 0:4916a63a6cbf 70 }
joshdavy 0:4916a63a6cbf 71
joshdavy 0:4916a63a6cbf 72 // sets normal video mode (black on white)
joshdavy 0:4916a63a6cbf 73 void N5110::normalMode()
joshdavy 0:4916a63a6cbf 74 {
joshdavy 0:4916a63a6cbf 75 sendCommand(0b00100000); // basic instruction
joshdavy 0:4916a63a6cbf 76 sendCommand(0b00001100); // normal video mode- datasheet
joshdavy 0:4916a63a6cbf 77 }
joshdavy 0:4916a63a6cbf 78
joshdavy 0:4916a63a6cbf 79 // sets normal video mode (white on black)
joshdavy 0:4916a63a6cbf 80 void N5110::inverseMode()
joshdavy 0:4916a63a6cbf 81 {
joshdavy 0:4916a63a6cbf 82 sendCommand(0b00100000); // basic instruction
joshdavy 0:4916a63a6cbf 83 sendCommand(0b00001101); // inverse video mode - datasheet
joshdavy 0:4916a63a6cbf 84 }
joshdavy 0:4916a63a6cbf 85
joshdavy 0:4916a63a6cbf 86 // function to power up the LCD and backlight - only works when using GPIO to power
joshdavy 0:4916a63a6cbf 87 void N5110::turnOn()
joshdavy 0:4916a63a6cbf 88 {
joshdavy 0:4916a63a6cbf 89 if (_pwr != NULL) {
joshdavy 0:4916a63a6cbf 90 _pwr->write(1); // apply power
joshdavy 0:4916a63a6cbf 91 }
joshdavy 0:4916a63a6cbf 92 }
joshdavy 0:4916a63a6cbf 93
joshdavy 0:4916a63a6cbf 94 // function to power down LCD
joshdavy 0:4916a63a6cbf 95 void N5110::turnOff()
joshdavy 0:4916a63a6cbf 96 {
joshdavy 0:4916a63a6cbf 97 clear(); // clear buffer
joshdavy 0:4916a63a6cbf 98 refresh();
joshdavy 0:4916a63a6cbf 99 setBrightness(0.0); // turn backlight off
joshdavy 0:4916a63a6cbf 100 clearRAM(); // clear RAM to ensure specified current consumption
joshdavy 0:4916a63a6cbf 101 // send command to ensure we are in basic mode
joshdavy 0:4916a63a6cbf 102
joshdavy 0:4916a63a6cbf 103 sendCommand(0b00100000); // basic mode
joshdavy 0:4916a63a6cbf 104 sendCommand(0b00001000); // clear display
joshdavy 0:4916a63a6cbf 105 sendCommand(0b00100001); // extended mode
joshdavy 0:4916a63a6cbf 106 sendCommand(0b00100100); // power down
joshdavy 0:4916a63a6cbf 107
joshdavy 0:4916a63a6cbf 108 // if we are powering the LCD using the GPIO then make it low to turn off
joshdavy 0:4916a63a6cbf 109 if (_pwr != NULL) {
joshdavy 0:4916a63a6cbf 110 wait_ms(10); // small delay and then turn off the power pin
joshdavy 0:4916a63a6cbf 111 _pwr->write(0); // turn off power
joshdavy 0:4916a63a6cbf 112 }
joshdavy 0:4916a63a6cbf 113
joshdavy 0:4916a63a6cbf 114 }
joshdavy 0:4916a63a6cbf 115
joshdavy 0:4916a63a6cbf 116 // function to change LED backlight brightness
joshdavy 0:4916a63a6cbf 117 void N5110::setBrightness(float brightness)
joshdavy 0:4916a63a6cbf 118 {
joshdavy 0:4916a63a6cbf 119 // check whether brightness is within range
joshdavy 0:4916a63a6cbf 120 if (brightness < 0.0f)
joshdavy 0:4916a63a6cbf 121 brightness = 0.0f;
joshdavy 0:4916a63a6cbf 122 if (brightness > 1.0f)
joshdavy 0:4916a63a6cbf 123 brightness = 1.0f;
joshdavy 0:4916a63a6cbf 124 // set PWM duty cycle
joshdavy 0:4916a63a6cbf 125 _led->write(brightness);
joshdavy 0:4916a63a6cbf 126 }
joshdavy 0:4916a63a6cbf 127
joshdavy 0:4916a63a6cbf 128 void N5110::setContrast(float contrast) {
joshdavy 0:4916a63a6cbf 129
joshdavy 0:4916a63a6cbf 130 // enforce limits
joshdavy 0:4916a63a6cbf 131 if (contrast > 1.0f)
joshdavy 0:4916a63a6cbf 132 contrast = 1.0f;
joshdavy 0:4916a63a6cbf 133 else if (contrast < 0.0f)
joshdavy 0:4916a63a6cbf 134 contrast = 0.0;
joshdavy 0:4916a63a6cbf 135
joshdavy 0:4916a63a6cbf 136 // convert to char in range 0 to 127 (i.e. 6 bits)
joshdavy 0:4916a63a6cbf 137 char ic = char(contrast*127.0f);
joshdavy 0:4916a63a6cbf 138
joshdavy 0:4916a63a6cbf 139 sendCommand(0b00100001); // extended instruction set
joshdavy 0:4916a63a6cbf 140 sendCommand(0b10000000 | ic); // set Vop (which controls contrast)
joshdavy 0:4916a63a6cbf 141 sendCommand(0b00100000); // back to basic instruction set
joshdavy 0:4916a63a6cbf 142 }
joshdavy 0:4916a63a6cbf 143
joshdavy 0:4916a63a6cbf 144 void N5110::setTempCoefficient(char tc) {
joshdavy 0:4916a63a6cbf 145
joshdavy 0:4916a63a6cbf 146 // enforce limits
joshdavy 0:4916a63a6cbf 147 if (tc>3) {
joshdavy 0:4916a63a6cbf 148 tc=3;
joshdavy 0:4916a63a6cbf 149 }
joshdavy 0:4916a63a6cbf 150
joshdavy 0:4916a63a6cbf 151 // temperature coefficient may need increasing at low temperatures
joshdavy 0:4916a63a6cbf 152
joshdavy 0:4916a63a6cbf 153 sendCommand(0b00100001); // extended instruction set
joshdavy 0:4916a63a6cbf 154 sendCommand(0b00000100 | tc);
joshdavy 0:4916a63a6cbf 155 sendCommand(0b00100000); // back to basic instruction set
joshdavy 0:4916a63a6cbf 156 }
joshdavy 0:4916a63a6cbf 157
joshdavy 0:4916a63a6cbf 158 void N5110::setBias(char bias) {
joshdavy 0:4916a63a6cbf 159
joshdavy 0:4916a63a6cbf 160 // from data sheet
joshdavy 0:4916a63a6cbf 161 // bias mux rate
joshdavy 0:4916a63a6cbf 162 // 0 1:100
joshdavy 0:4916a63a6cbf 163 // 1 1:80
joshdavy 0:4916a63a6cbf 164 // 2 1:65
joshdavy 0:4916a63a6cbf 165 // 3 1:48 (default)
joshdavy 0:4916a63a6cbf 166 // 4 1:40/1:34
joshdavy 0:4916a63a6cbf 167 // 5 1:24
joshdavy 0:4916a63a6cbf 168 // 6 1:18/1:16
joshdavy 0:4916a63a6cbf 169 // 7 1:10/1:9/1:8
joshdavy 0:4916a63a6cbf 170
joshdavy 0:4916a63a6cbf 171 // enforce limits
joshdavy 0:4916a63a6cbf 172 if (bias>7) {
joshdavy 0:4916a63a6cbf 173 bias=7;
joshdavy 0:4916a63a6cbf 174 }
joshdavy 0:4916a63a6cbf 175
joshdavy 0:4916a63a6cbf 176 sendCommand(0b00100001); // extended mode instruction
joshdavy 0:4916a63a6cbf 177 sendCommand(0b00010000 | bias);
joshdavy 0:4916a63a6cbf 178 sendCommand(0b00100000); // end of extended mode instruction
joshdavy 0:4916a63a6cbf 179 }
joshdavy 0:4916a63a6cbf 180
joshdavy 0:4916a63a6cbf 181 // pulse the active low reset line
joshdavy 0:4916a63a6cbf 182 void N5110::reset()
joshdavy 0:4916a63a6cbf 183 {
joshdavy 0:4916a63a6cbf 184 _rst->write(0); // reset the LCD
joshdavy 0:4916a63a6cbf 185 _rst->write(1);
joshdavy 0:4916a63a6cbf 186 }
joshdavy 0:4916a63a6cbf 187
joshdavy 0:4916a63a6cbf 188 // function to initialise SPI peripheral
joshdavy 0:4916a63a6cbf 189 void N5110::initSPI()
joshdavy 0:4916a63a6cbf 190 {
joshdavy 0:4916a63a6cbf 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
joshdavy 0:4916a63a6cbf 192 _spi->frequency(4000000); // maximum of screen is 4 MHz
joshdavy 0:4916a63a6cbf 193 }
joshdavy 0:4916a63a6cbf 194
joshdavy 0:4916a63a6cbf 195 // send a command to the display
joshdavy 0:4916a63a6cbf 196 void N5110::sendCommand(unsigned char command)
joshdavy 0:4916a63a6cbf 197 {
joshdavy 0:4916a63a6cbf 198 _dc->write(0); // set DC low for command
joshdavy 0:4916a63a6cbf 199 _sce->write(0); // set CE low to begin frame
joshdavy 0:4916a63a6cbf 200 _spi->write(command); // send command
joshdavy 0:4916a63a6cbf 201 _dc->write(1); // turn back to data by default
joshdavy 0:4916a63a6cbf 202 _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
joshdavy 0:4916a63a6cbf 203 }
joshdavy 0:4916a63a6cbf 204
joshdavy 0:4916a63a6cbf 205 // send data to the display at the current XY address
joshdavy 0:4916a63a6cbf 206 // dc is set to 1 (i.e. data) after sending a command and so should
joshdavy 0:4916a63a6cbf 207 // be the default mode.
joshdavy 0:4916a63a6cbf 208 void N5110::sendData(unsigned char data)
joshdavy 0:4916a63a6cbf 209 {
joshdavy 0:4916a63a6cbf 210 _sce->write(0); // set CE low to begin frame
joshdavy 0:4916a63a6cbf 211 _spi->write(data);
joshdavy 0:4916a63a6cbf 212 _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
joshdavy 0:4916a63a6cbf 213 }
joshdavy 0:4916a63a6cbf 214
joshdavy 0:4916a63a6cbf 215 // this function writes 0 to the 504 bytes to clear the RAM
joshdavy 0:4916a63a6cbf 216 void N5110::clearRAM()
joshdavy 0:4916a63a6cbf 217 {
joshdavy 0:4916a63a6cbf 218 _sce->write(0); //set CE low to begin frame
joshdavy 0:4916a63a6cbf 219 for(int i = 0; i < WIDTH * HEIGHT; i++) { // 48 x 84 bits = 504 bytes
joshdavy 0:4916a63a6cbf 220 _spi->write(0x00); // send 0's
joshdavy 0:4916a63a6cbf 221 }
joshdavy 0:4916a63a6cbf 222 _sce->write(1); // set CE high to end frame
joshdavy 0:4916a63a6cbf 223 }
joshdavy 0:4916a63a6cbf 224
joshdavy 0:4916a63a6cbf 225 // function to set the XY address in RAM for subsequenct data write
joshdavy 0:4916a63a6cbf 226 void N5110::setXYAddress(unsigned int const x,
joshdavy 0:4916a63a6cbf 227 unsigned int const y)
joshdavy 0:4916a63a6cbf 228 {
joshdavy 0:4916a63a6cbf 229 if (x<WIDTH && y<HEIGHT) { // check within range
joshdavy 0:4916a63a6cbf 230 sendCommand(0b00100000); // basic instruction
joshdavy 0:4916a63a6cbf 231 sendCommand(0b10000000 | x); // send addresses to display with relevant mask
joshdavy 0:4916a63a6cbf 232 sendCommand(0b01000000 | y);
joshdavy 0:4916a63a6cbf 233 }
joshdavy 0:4916a63a6cbf 234 }
joshdavy 0:4916a63a6cbf 235
joshdavy 0:4916a63a6cbf 236 // These functions are used to set, clear and get the value of pixels in the display
joshdavy 0:4916a63a6cbf 237 // Pixels are addressed in the range of 0 to 47 (y) and 0 to 83 (x). The refresh()
joshdavy 0:4916a63a6cbf 238 // function must be called after set and clear in order to update the display
joshdavy 0:4916a63a6cbf 239 void N5110::setPixel(unsigned int const x,
joshdavy 0:4916a63a6cbf 240 unsigned int const y,
joshdavy 0:4916a63a6cbf 241 bool const state)
joshdavy 0:4916a63a6cbf 242 {
joshdavy 0:4916a63a6cbf 243 if (x<WIDTH && y<HEIGHT) { // check within range
joshdavy 0:4916a63a6cbf 244 // calculate bank and shift 1 to required position in the data byte
joshdavy 0:4916a63a6cbf 245 if(state) buffer[x][y/8] |= (1 << y%8);
joshdavy 0:4916a63a6cbf 246 else buffer[x][y/8] &= ~(1 << y%8);
joshdavy 0:4916a63a6cbf 247 }
joshdavy 0:4916a63a6cbf 248 }
joshdavy 0:4916a63a6cbf 249
joshdavy 0:4916a63a6cbf 250 void N5110::clearPixel(unsigned int const x,
joshdavy 0:4916a63a6cbf 251 unsigned int const y)
joshdavy 0:4916a63a6cbf 252 {
joshdavy 0:4916a63a6cbf 253 if (x<WIDTH && y<HEIGHT) { // check within range
joshdavy 0:4916a63a6cbf 254 // calculate bank and shift 1 to required position (using bit clear)
joshdavy 0:4916a63a6cbf 255 buffer[x][y/8] &= ~(1 << y%8);
joshdavy 0:4916a63a6cbf 256 }
joshdavy 0:4916a63a6cbf 257 }
joshdavy 0:4916a63a6cbf 258
joshdavy 0:4916a63a6cbf 259 int N5110::getPixel(unsigned int const x,
joshdavy 0:4916a63a6cbf 260 unsigned int const y) const
joshdavy 0:4916a63a6cbf 261 {
joshdavy 0:4916a63a6cbf 262 if (x<WIDTH && y<HEIGHT) { // check within range
joshdavy 0:4916a63a6cbf 263 // return relevant bank and mask required bit
joshdavy 0:4916a63a6cbf 264
joshdavy 0:4916a63a6cbf 265 int pixel = (int) buffer[x][y/8] & (1 << y%8);
joshdavy 0:4916a63a6cbf 266
joshdavy 0:4916a63a6cbf 267 if (pixel)
joshdavy 0:4916a63a6cbf 268 return 1;
joshdavy 0:4916a63a6cbf 269 else
joshdavy 0:4916a63a6cbf 270 return 0;
joshdavy 0:4916a63a6cbf 271 }
joshdavy 0:4916a63a6cbf 272
joshdavy 0:4916a63a6cbf 273 return 0;
joshdavy 0:4916a63a6cbf 274
joshdavy 0:4916a63a6cbf 275 }
joshdavy 0:4916a63a6cbf 276
joshdavy 0:4916a63a6cbf 277 // function to refresh the display
joshdavy 0:4916a63a6cbf 278 void N5110::refresh()
joshdavy 0:4916a63a6cbf 279 {
joshdavy 0:4916a63a6cbf 280 setXYAddress(0,0); // important to set address back to 0,0 before refreshing display
joshdavy 0:4916a63a6cbf 281 // address auto increments after printing string, so buffer[0][0] will not coincide
joshdavy 0:4916a63a6cbf 282 // with top-left pixel after priting string
joshdavy 0:4916a63a6cbf 283
joshdavy 0:4916a63a6cbf 284 _sce->write(0); //set CE low to begin frame
joshdavy 0:4916a63a6cbf 285
joshdavy 0:4916a63a6cbf 286 for(int j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
joshdavy 0:4916a63a6cbf 287 for(int i = 0; i < WIDTH; i++) {
joshdavy 0:4916a63a6cbf 288 _spi->write(buffer[i][j]); // send buffer
joshdavy 0:4916a63a6cbf 289 }
joshdavy 0:4916a63a6cbf 290 }
joshdavy 0:4916a63a6cbf 291 _sce->write(1); // set CE high to end frame
joshdavy 0:4916a63a6cbf 292
joshdavy 0:4916a63a6cbf 293 }
joshdavy 0:4916a63a6cbf 294
joshdavy 0:4916a63a6cbf 295 // fills the buffer with random bytes. Can be used to test the display.
joshdavy 0:4916a63a6cbf 296 // The rand() function isn't seeded so it probably creates the same pattern everytime
joshdavy 0:4916a63a6cbf 297 void N5110::randomiseBuffer()
joshdavy 0:4916a63a6cbf 298 {
joshdavy 0:4916a63a6cbf 299 int i,j;
joshdavy 0:4916a63a6cbf 300 for(j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
joshdavy 0:4916a63a6cbf 301 for(i = 0; i < WIDTH; i++) {
joshdavy 0:4916a63a6cbf 302 buffer[i][j] = rand()%256; // generate random byte
joshdavy 0:4916a63a6cbf 303 }
joshdavy 0:4916a63a6cbf 304 }
joshdavy 0:4916a63a6cbf 305
joshdavy 0:4916a63a6cbf 306 }
joshdavy 0:4916a63a6cbf 307
joshdavy 0:4916a63a6cbf 308 // function to print 5x7 font
joshdavy 0:4916a63a6cbf 309 void N5110::printChar(char const c,
joshdavy 0:4916a63a6cbf 310 unsigned int const x,
joshdavy 0:4916a63a6cbf 311 unsigned int const y)
joshdavy 0:4916a63a6cbf 312 {
joshdavy 0:4916a63a6cbf 313 if (y<BANKS) { // check if printing in range of y banks
joshdavy 0:4916a63a6cbf 314
joshdavy 0:4916a63a6cbf 315 for (int i = 0; i < 5 ; i++ ) {
joshdavy 0:4916a63a6cbf 316 int pixel_x = x+i;
joshdavy 0:4916a63a6cbf 317 if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83)
joshdavy 0:4916a63a6cbf 318 break;
joshdavy 0:4916a63a6cbf 319 buffer[pixel_x][y] = font5x7[(c - 32)*5 + i];
joshdavy 0:4916a63a6cbf 320 // array is offset by 32 relative to ASCII, each character is 5 pixels wide
joshdavy 0:4916a63a6cbf 321 }
joshdavy 0:4916a63a6cbf 322
joshdavy 0:4916a63a6cbf 323 }
joshdavy 0:4916a63a6cbf 324 }
joshdavy 0:4916a63a6cbf 325
joshdavy 0:4916a63a6cbf 326 // function to print string at specified position
joshdavy 0:4916a63a6cbf 327 void N5110::printString(const char *str,
joshdavy 0:4916a63a6cbf 328 unsigned int const x,
joshdavy 0:4916a63a6cbf 329 unsigned int const y)
joshdavy 0:4916a63a6cbf 330 {
joshdavy 0:4916a63a6cbf 331 if (y<BANKS) { // check if printing in range of y banks
joshdavy 0:4916a63a6cbf 332
joshdavy 0:4916a63a6cbf 333 int n = 0 ; // counter for number of characters in string
joshdavy 0:4916a63a6cbf 334 // loop through string and print character
joshdavy 0:4916a63a6cbf 335 while(*str) {
joshdavy 0:4916a63a6cbf 336
joshdavy 0:4916a63a6cbf 337 // writes the character bitmap data to the buffer, so that
joshdavy 0:4916a63a6cbf 338 // text and pixels can be displayed at the same time
joshdavy 0:4916a63a6cbf 339 for (int i = 0; i < 5 ; i++ ) {
joshdavy 0:4916a63a6cbf 340 int pixel_x = x+i+n*6;
joshdavy 0:4916a63a6cbf 341 if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83)
joshdavy 0:4916a63a6cbf 342 break;
joshdavy 0:4916a63a6cbf 343 buffer[pixel_x][y] = font5x7[(*str - 32)*5 + i];
joshdavy 0:4916a63a6cbf 344 }
joshdavy 0:4916a63a6cbf 345 str++; // go to next character in string
joshdavy 0:4916a63a6cbf 346 n++; // increment index
joshdavy 0:4916a63a6cbf 347 }
joshdavy 0:4916a63a6cbf 348 }
joshdavy 0:4916a63a6cbf 349 }
joshdavy 0:4916a63a6cbf 350
joshdavy 0:4916a63a6cbf 351 // function to clear the screen buffer
joshdavy 0:4916a63a6cbf 352 void N5110::clear()
joshdavy 0:4916a63a6cbf 353 {
joshdavy 0:4916a63a6cbf 354 memset(buffer,0,sizeof(buffer));
joshdavy 0:4916a63a6cbf 355 }
joshdavy 0:4916a63a6cbf 356
joshdavy 0:4916a63a6cbf 357 // function to plot array on display
joshdavy 0:4916a63a6cbf 358 void N5110::plotArray(float const array[])
joshdavy 0:4916a63a6cbf 359 {
joshdavy 0:4916a63a6cbf 360 for (int i=0; i<WIDTH; i++) { // loop through array
joshdavy 0:4916a63a6cbf 361 // elements are normalised from 0.0 to 1.0, so multiply
joshdavy 0:4916a63a6cbf 362 // by 47 to convert to pixel range, and subtract from 47
joshdavy 0:4916a63a6cbf 363 // since top-left is 0,0 in the display geometry
joshdavy 0:4916a63a6cbf 364 setPixel(i,47 - int(array[i]*47.0f),true);
joshdavy 0:4916a63a6cbf 365 }
joshdavy 0:4916a63a6cbf 366
joshdavy 0:4916a63a6cbf 367 }
joshdavy 0:4916a63a6cbf 368
joshdavy 0:4916a63a6cbf 369 // function to draw circle
joshdavy 0:4916a63a6cbf 370 void N5110:: drawCircle(unsigned int const x0,
joshdavy 0:4916a63a6cbf 371 unsigned int const y0,
joshdavy 0:4916a63a6cbf 372 unsigned int const radius,
joshdavy 0:4916a63a6cbf 373 FillType const fill)
joshdavy 0:4916a63a6cbf 374 {
joshdavy 0:4916a63a6cbf 375 // from http://en.wikipedia.org/wiki/Midpoint_circle_algorithm
joshdavy 0:4916a63a6cbf 376 int x = radius;
joshdavy 0:4916a63a6cbf 377 int y = 0;
joshdavy 0:4916a63a6cbf 378 int radiusError = 1-x;
joshdavy 0:4916a63a6cbf 379
joshdavy 0:4916a63a6cbf 380 while(x >= y) {
joshdavy 0:4916a63a6cbf 381
joshdavy 0:4916a63a6cbf 382 // if transparent, just draw outline
joshdavy 0:4916a63a6cbf 383 if (fill == FILL_TRANSPARENT) {
joshdavy 0:4916a63a6cbf 384 setPixel( x + x0, y + y0,true);
joshdavy 0:4916a63a6cbf 385 setPixel(-x + x0, y + y0,true);
joshdavy 0:4916a63a6cbf 386 setPixel( y + x0, x + y0,true);
joshdavy 0:4916a63a6cbf 387 setPixel(-y + x0, x + y0,true);
joshdavy 0:4916a63a6cbf 388 setPixel(-y + x0, -x + y0,true);
joshdavy 0:4916a63a6cbf 389 setPixel( y + x0, -x + y0,true);
joshdavy 0:4916a63a6cbf 390 setPixel( x + x0, -y + y0,true);
joshdavy 0:4916a63a6cbf 391 setPixel(-x + x0, -y + y0,true);
joshdavy 0:4916a63a6cbf 392 } else { // drawing filled circle, so draw lines between points at same y value
joshdavy 0:4916a63a6cbf 393
joshdavy 0:4916a63a6cbf 394 int type = (fill==FILL_BLACK) ? 1:0; // black or white fill
joshdavy 0:4916a63a6cbf 395
joshdavy 0:4916a63a6cbf 396 drawLine(x+x0,y+y0,-x+x0,y+y0,type);
joshdavy 0:4916a63a6cbf 397 drawLine(y+x0,x+y0,-y+x0,x+y0,type);
joshdavy 0:4916a63a6cbf 398 drawLine(y+x0,-x+y0,-y+x0,-x+y0,type);
joshdavy 0:4916a63a6cbf 399 drawLine(x+x0,-y+y0,-x+x0,-y+y0,type);
joshdavy 0:4916a63a6cbf 400 }
joshdavy 0:4916a63a6cbf 401
joshdavy 0:4916a63a6cbf 402 y++;
joshdavy 0:4916a63a6cbf 403 if (radiusError<0) {
joshdavy 0:4916a63a6cbf 404 radiusError += 2 * y + 1;
joshdavy 0:4916a63a6cbf 405 } else {
joshdavy 0:4916a63a6cbf 406 x--;
joshdavy 0:4916a63a6cbf 407 radiusError += 2 * (y - x) + 1;
joshdavy 0:4916a63a6cbf 408 }
joshdavy 0:4916a63a6cbf 409 }
joshdavy 0:4916a63a6cbf 410
joshdavy 0:4916a63a6cbf 411 }
joshdavy 0:4916a63a6cbf 412
joshdavy 0:4916a63a6cbf 413 void N5110::drawLine(unsigned int const x0,
joshdavy 0:4916a63a6cbf 414 unsigned int const y0,
joshdavy 0:4916a63a6cbf 415 unsigned int const x1,
joshdavy 0:4916a63a6cbf 416 unsigned int const y1,
joshdavy 0:4916a63a6cbf 417 unsigned int const type)
joshdavy 0:4916a63a6cbf 418 {
joshdavy 0:4916a63a6cbf 419 // Note that the ranges can be negative so we have to turn the input values
joshdavy 0:4916a63a6cbf 420 // into signed integers first
joshdavy 0:4916a63a6cbf 421 int const y_range = static_cast<int>(y1) - static_cast<int>(y0);
joshdavy 0:4916a63a6cbf 422 int const x_range = static_cast<int>(x1) - static_cast<int>(x0);
joshdavy 0:4916a63a6cbf 423
joshdavy 0:4916a63a6cbf 424 // if dotted line, set step to 2, else step is 1
joshdavy 0:4916a63a6cbf 425 unsigned int const step = (type==2) ? 2:1;
joshdavy 0:4916a63a6cbf 426
joshdavy 0:4916a63a6cbf 427 // make sure we loop over the largest range to get the most pixels on the display
joshdavy 0:4916a63a6cbf 428 // for instance, if drawing a vertical line (x_range = 0), we need to loop down the y pixels
joshdavy 0:4916a63a6cbf 429 // or else we'll only end up with 1 pixel in the x column
joshdavy 0:4916a63a6cbf 430 if ( abs(x_range) > abs(y_range) ) {
joshdavy 0:4916a63a6cbf 431
joshdavy 0:4916a63a6cbf 432 // ensure we loop from smallest to largest or else for-loop won't run as expected
joshdavy 0:4916a63a6cbf 433 unsigned int const start = x_range > 0 ? x0:x1;
joshdavy 0:4916a63a6cbf 434 unsigned int const stop = x_range > 0 ? x1:x0;
joshdavy 0:4916a63a6cbf 435
joshdavy 0:4916a63a6cbf 436 // loop between x pixels
joshdavy 0:4916a63a6cbf 437 for (unsigned int x = start; x<= stop ; x+=step) {
joshdavy 0:4916a63a6cbf 438 // do linear interpolation
joshdavy 0:4916a63a6cbf 439 int const dx = static_cast<int>(x)-static_cast<int>(x0);
joshdavy 0:4916a63a6cbf 440 unsigned int const y = y0 + y_range * dx / x_range;
joshdavy 0:4916a63a6cbf 441
joshdavy 0:4916a63a6cbf 442 // If the line type is '0', this will clear the pixel
joshdavy 0:4916a63a6cbf 443 // If it is '1' or '2', the pixel will be set
joshdavy 0:4916a63a6cbf 444 setPixel(x,y, type);
joshdavy 0:4916a63a6cbf 445 }
joshdavy 0:4916a63a6cbf 446 } else {
joshdavy 0:4916a63a6cbf 447
joshdavy 0:4916a63a6cbf 448 // ensure we loop from smallest to largest or else for-loop won't run as expected
joshdavy 0:4916a63a6cbf 449 unsigned int const start = y_range > 0 ? y0:y1;
joshdavy 0:4916a63a6cbf 450 unsigned int const stop = y_range > 0 ? y1:y0;
joshdavy 0:4916a63a6cbf 451
joshdavy 0:4916a63a6cbf 452 for (unsigned int y = start; y<= stop ; y+=step) {
joshdavy 0:4916a63a6cbf 453 // do linear interpolation
joshdavy 0:4916a63a6cbf 454 int const dy = static_cast<int>(y)-static_cast<int>(y0);
joshdavy 0:4916a63a6cbf 455 unsigned int const x = x0 + x_range * dy / y_range;
joshdavy 0:4916a63a6cbf 456
joshdavy 0:4916a63a6cbf 457 // If the line type is '0', this will clear the pixel
joshdavy 0:4916a63a6cbf 458 // If it is '1' or '2', the pixel will be set
joshdavy 0:4916a63a6cbf 459 setPixel(x,y, type);
joshdavy 0:4916a63a6cbf 460 }
joshdavy 0:4916a63a6cbf 461 }
joshdavy 0:4916a63a6cbf 462
joshdavy 0:4916a63a6cbf 463 }
joshdavy 0:4916a63a6cbf 464
joshdavy 0:4916a63a6cbf 465 void N5110::drawRect(unsigned int const x0,
joshdavy 0:4916a63a6cbf 466 unsigned int const y0,
joshdavy 0:4916a63a6cbf 467 unsigned int const width,
joshdavy 0:4916a63a6cbf 468 unsigned int const height,
joshdavy 0:4916a63a6cbf 469 FillType const fill)
joshdavy 0:4916a63a6cbf 470 {
joshdavy 0:4916a63a6cbf 471 if (fill == FILL_TRANSPARENT) { // transparent, just outline
joshdavy 0:4916a63a6cbf 472 drawLine(x0,y0,x0+(width-1),y0,1); // top
joshdavy 0:4916a63a6cbf 473 drawLine(x0,y0+(height-1),x0+(width-1),y0+(height-1),1); // bottom
joshdavy 0:4916a63a6cbf 474 drawLine(x0,y0,x0,y0+(height-1),1); // left
joshdavy 0:4916a63a6cbf 475 drawLine(x0+(width-1),y0,x0+(width-1),y0+(height-1),1); // right
joshdavy 0:4916a63a6cbf 476 } else { // filled rectangle
joshdavy 0:4916a63a6cbf 477 int type = (fill==FILL_BLACK) ? 1:0; // black or white fill
joshdavy 0:4916a63a6cbf 478 for (int y = y0; y<y0+height; y++) { // loop through rows of rectangle
joshdavy 0:4916a63a6cbf 479 drawLine(x0,y,x0+(width-1),y,type); // draw line across screen
joshdavy 0:4916a63a6cbf 480 }
joshdavy 0:4916a63a6cbf 481 }
joshdavy 0:4916a63a6cbf 482 }
joshdavy 0:4916a63a6cbf 483
joshdavy 0:4916a63a6cbf 484 void N5110::drawSprite(int x0,
joshdavy 0:4916a63a6cbf 485 int y0,
joshdavy 0:4916a63a6cbf 486 int nrows,
joshdavy 0:4916a63a6cbf 487 int ncols,
joshdavy 0:4916a63a6cbf 488 int *sprite)
joshdavy 0:4916a63a6cbf 489 {
joshdavy 0:4916a63a6cbf 490 for (int i = 0; i < nrows; i++) {
joshdavy 0:4916a63a6cbf 491 for (int j = 0 ; j < ncols ; j++) {
joshdavy 0:4916a63a6cbf 492
joshdavy 0:4916a63a6cbf 493 int pixel = *((sprite+i*ncols)+j);
joshdavy 0:4916a63a6cbf 494 setPixel(x0+j,y0+i, pixel);
joshdavy 0:4916a63a6cbf 495 }
joshdavy 0:4916a63a6cbf 496 }
joshdavy 0:4916a63a6cbf 497 }