Haoyan Zhang / Mbed 2 deprecated el17h2z1

deemo1

Dependencies:   mbed

N5110/N5110.cpp@0:08b2bdddf22e, 2020-04-28 (annotated)

Committer:
haoyan
Date:
Tue Apr 28 14:38:02 2020 +0000
Revision:
0:08b2bdddf22e
deemo

Who changed what in which revision?

UserRevisionLine numberNew contents of line
haoyan 0:08b2bdddf22e 1 #include "mbed.h"
haoyan 0:08b2bdddf22e 2 #include "N5110.h"
haoyan 0:08b2bdddf22e 3
haoyan 0:08b2bdddf22e 4 // overloaded constructor includes power pin - LCD Vcc connected to GPIO pin
haoyan 0:08b2bdddf22e 5 // this constructor works fine with LPC1768 - enough current sourced from GPIO
haoyan 0:08b2bdddf22e 6 // to power LCD. Doesn't work well with K64F.
haoyan 0:08b2bdddf22e 7 N5110::N5110(PinName const pwrPin,
haoyan 0:08b2bdddf22e 8 PinName const scePin,
haoyan 0:08b2bdddf22e 9 PinName const rstPin,
haoyan 0:08b2bdddf22e 10 PinName const dcPin,
haoyan 0:08b2bdddf22e 11 PinName const mosiPin,
haoyan 0:08b2bdddf22e 12 PinName const sclkPin,
haoyan 0:08b2bdddf22e 13 PinName const ledPin)
haoyan 0:08b2bdddf22e 14 :
haoyan 0:08b2bdddf22e 15 _spi(new SPI(mosiPin,NC,sclkPin)), // create new SPI instance and initialise
haoyan 0:08b2bdddf22e 16 _led(new PwmOut(ledPin)),
haoyan 0:08b2bdddf22e 17 _pwr(new DigitalOut(pwrPin)),
haoyan 0:08b2bdddf22e 18 _sce(new DigitalOut(scePin)),
haoyan 0:08b2bdddf22e 19 _rst(new DigitalOut(rstPin)),
haoyan 0:08b2bdddf22e 20 _dc(new DigitalOut(dcPin))
haoyan 0:08b2bdddf22e 21 {}
haoyan 0:08b2bdddf22e 22
haoyan 0:08b2bdddf22e 23 // overloaded constructor does not include power pin - LCD Vcc must be tied to +3V3
haoyan 0:08b2bdddf22e 24 // Best to use this with K64F as the GPIO hasn't sufficient output current to reliably
haoyan 0:08b2bdddf22e 25 // drive the LCD.
haoyan 0:08b2bdddf22e 26 N5110::N5110(PinName const scePin,
haoyan 0:08b2bdddf22e 27 PinName const rstPin,
haoyan 0:08b2bdddf22e 28 PinName const dcPin,
haoyan 0:08b2bdddf22e 29 PinName const mosiPin,
haoyan 0:08b2bdddf22e 30 PinName const sclkPin,
haoyan 0:08b2bdddf22e 31 PinName const ledPin)
haoyan 0:08b2bdddf22e 32 :
haoyan 0:08b2bdddf22e 33 _spi(new SPI(mosiPin,NC,sclkPin)), // create new SPI instance and initialise
haoyan 0:08b2bdddf22e 34 _led(new PwmOut(ledPin)),
haoyan 0:08b2bdddf22e 35 _pwr(NULL), // pwr not needed so null it to be safe
haoyan 0:08b2bdddf22e 36 _sce(new DigitalOut(scePin)),
haoyan 0:08b2bdddf22e 37 _rst(new DigitalOut(rstPin)),
haoyan 0:08b2bdddf22e 38 _dc(new DigitalOut(dcPin))
haoyan 0:08b2bdddf22e 39 {}
haoyan 0:08b2bdddf22e 40
haoyan 0:08b2bdddf22e 41 N5110::~N5110()
haoyan 0:08b2bdddf22e 42 {
haoyan 0:08b2bdddf22e 43 delete _spi;
haoyan 0:08b2bdddf22e 44
haoyan 0:08b2bdddf22e 45 if(_pwr) {
haoyan 0:08b2bdddf22e 46 delete _pwr;
haoyan 0:08b2bdddf22e 47 }
haoyan 0:08b2bdddf22e 48
haoyan 0:08b2bdddf22e 49 delete _led;
haoyan 0:08b2bdddf22e 50 delete _sce;
haoyan 0:08b2bdddf22e 51 delete _rst;
haoyan 0:08b2bdddf22e 52 delete _dc;
haoyan 0:08b2bdddf22e 53 }
haoyan 0:08b2bdddf22e 54
haoyan 0:08b2bdddf22e 55 // initialise function - powers up and sends the initialisation commands
haoyan 0:08b2bdddf22e 56 void N5110::init()
haoyan 0:08b2bdddf22e 57 {
haoyan 0:08b2bdddf22e 58 turnOn(); // power up
haoyan 0:08b2bdddf22e 59 reset(); // reset LCD - must be done within 100 ms
haoyan 0:08b2bdddf22e 60 initSPI();
haoyan 0:08b2bdddf22e 61
haoyan 0:08b2bdddf22e 62 setContrast(0.55); // this may need tuning (say 0.4 to 0.6)
haoyan 0:08b2bdddf22e 63 setBias(3); // datasheet - 48:1 mux - don't mess with if you don't know what you're doing! (0 to 7)
haoyan 0:08b2bdddf22e 64 setTempCoefficient(0); // datasheet - may need increasing (range 0 to 3) at very low temperatures
haoyan 0:08b2bdddf22e 65 normalMode(); // normal video mode by default
haoyan 0:08b2bdddf22e 66
haoyan 0:08b2bdddf22e 67 clearRAM(); // RAM is undefined at power-up so clear to be sure
haoyan 0:08b2bdddf22e 68 clear(); // clear buffer
haoyan 0:08b2bdddf22e 69 setBrightness(0.5);
haoyan 0:08b2bdddf22e 70 }
haoyan 0:08b2bdddf22e 71
haoyan 0:08b2bdddf22e 72 // sets normal video mode (black on white)
haoyan 0:08b2bdddf22e 73 void N5110::normalMode()
haoyan 0:08b2bdddf22e 74 {
haoyan 0:08b2bdddf22e 75 sendCommand(0b00100000); // basic instruction
haoyan 0:08b2bdddf22e 76 sendCommand(0b00001100); // normal video mode- datasheet
haoyan 0:08b2bdddf22e 77 }
haoyan 0:08b2bdddf22e 78
haoyan 0:08b2bdddf22e 79 // sets normal video mode (white on black)
haoyan 0:08b2bdddf22e 80 void N5110::inverseMode()
haoyan 0:08b2bdddf22e 81 {
haoyan 0:08b2bdddf22e 82 sendCommand(0b00100000); // basic instruction
haoyan 0:08b2bdddf22e 83 sendCommand(0b00001101); // inverse video mode - datasheet
haoyan 0:08b2bdddf22e 84 }
haoyan 0:08b2bdddf22e 85
haoyan 0:08b2bdddf22e 86 // function to power up the LCD and backlight - only works when using GPIO to power
haoyan 0:08b2bdddf22e 87 void N5110::turnOn()
haoyan 0:08b2bdddf22e 88 {
haoyan 0:08b2bdddf22e 89 if (_pwr != NULL) {
haoyan 0:08b2bdddf22e 90 _pwr->write(1); // apply power
haoyan 0:08b2bdddf22e 91 }
haoyan 0:08b2bdddf22e 92 }
haoyan 0:08b2bdddf22e 93
haoyan 0:08b2bdddf22e 94 // function to power down LCD
haoyan 0:08b2bdddf22e 95 void N5110::turnOff()
haoyan 0:08b2bdddf22e 96 {
haoyan 0:08b2bdddf22e 97 clear(); // clear buffer
haoyan 0:08b2bdddf22e 98 refresh();
haoyan 0:08b2bdddf22e 99 setBrightness(0.0); // turn backlight off
haoyan 0:08b2bdddf22e 100 clearRAM(); // clear RAM to ensure specified current consumption
haoyan 0:08b2bdddf22e 101 // send command to ensure we are in basic mode
haoyan 0:08b2bdddf22e 102
haoyan 0:08b2bdddf22e 103 sendCommand(0b00100000); // basic mode
haoyan 0:08b2bdddf22e 104 sendCommand(0b00001000); // clear display
haoyan 0:08b2bdddf22e 105 sendCommand(0b00100001); // extended mode
haoyan 0:08b2bdddf22e 106 sendCommand(0b00100100); // power down
haoyan 0:08b2bdddf22e 107
haoyan 0:08b2bdddf22e 108 // if we are powering the LCD using the GPIO then make it low to turn off
haoyan 0:08b2bdddf22e 109 if (_pwr != NULL) {
haoyan 0:08b2bdddf22e 110 wait_ms(10); // small delay and then turn off the power pin
haoyan 0:08b2bdddf22e 111 _pwr->write(0); // turn off power
haoyan 0:08b2bdddf22e 112 }
haoyan 0:08b2bdddf22e 113
haoyan 0:08b2bdddf22e 114 }
haoyan 0:08b2bdddf22e 115
haoyan 0:08b2bdddf22e 116 // function to change LED backlight brightness
haoyan 0:08b2bdddf22e 117 void N5110::setBrightness(float brightness)
haoyan 0:08b2bdddf22e 118 {
haoyan 0:08b2bdddf22e 119 // check whether brightness is within range
haoyan 0:08b2bdddf22e 120 if (brightness < 0.0f)
haoyan 0:08b2bdddf22e 121 brightness = 0.0f;
haoyan 0:08b2bdddf22e 122 if (brightness > 1.0f)
haoyan 0:08b2bdddf22e 123 brightness = 1.0f;
haoyan 0:08b2bdddf22e 124 // set PWM duty cycle
haoyan 0:08b2bdddf22e 125 _led->write(brightness);
haoyan 0:08b2bdddf22e 126 }
haoyan 0:08b2bdddf22e 127
haoyan 0:08b2bdddf22e 128 void N5110::setContrast(float contrast) {
haoyan 0:08b2bdddf22e 129
haoyan 0:08b2bdddf22e 130 // enforce limits
haoyan 0:08b2bdddf22e 131 if (contrast > 1.0f)
haoyan 0:08b2bdddf22e 132 contrast = 1.0f;
haoyan 0:08b2bdddf22e 133 else if (contrast < 0.0f)
haoyan 0:08b2bdddf22e 134 contrast = 0.0;
haoyan 0:08b2bdddf22e 135
haoyan 0:08b2bdddf22e 136 // convert to char in range 0 to 127 (i.e. 6 bits)
haoyan 0:08b2bdddf22e 137 char ic = char(contrast*127.0f);
haoyan 0:08b2bdddf22e 138
haoyan 0:08b2bdddf22e 139 sendCommand(0b00100001); // extended instruction set
haoyan 0:08b2bdddf22e 140 sendCommand(0b10000000 | ic); // set Vop (which controls contrast)
haoyan 0:08b2bdddf22e 141 sendCommand(0b00100000); // back to basic instruction set
haoyan 0:08b2bdddf22e 142 }
haoyan 0:08b2bdddf22e 143
haoyan 0:08b2bdddf22e 144 void N5110::setTempCoefficient(char tc) {
haoyan 0:08b2bdddf22e 145
haoyan 0:08b2bdddf22e 146 // enforce limits
haoyan 0:08b2bdddf22e 147 if (tc>3) {
haoyan 0:08b2bdddf22e 148 tc=3;
haoyan 0:08b2bdddf22e 149 }
haoyan 0:08b2bdddf22e 150
haoyan 0:08b2bdddf22e 151 // temperature coefficient may need increasing at low temperatures
haoyan 0:08b2bdddf22e 152
haoyan 0:08b2bdddf22e 153 sendCommand(0b00100001); // extended instruction set
haoyan 0:08b2bdddf22e 154 sendCommand(0b00000100 | tc);
haoyan 0:08b2bdddf22e 155 sendCommand(0b00100000); // back to basic instruction set
haoyan 0:08b2bdddf22e 156 }
haoyan 0:08b2bdddf22e 157
haoyan 0:08b2bdddf22e 158 void N5110::setBias(char bias) {
haoyan 0:08b2bdddf22e 159
haoyan 0:08b2bdddf22e 160 // from data sheet
haoyan 0:08b2bdddf22e 161 // bias mux rate
haoyan 0:08b2bdddf22e 162 // 0 1:100
haoyan 0:08b2bdddf22e 163 // 1 1:80
haoyan 0:08b2bdddf22e 164 // 2 1:65
haoyan 0:08b2bdddf22e 165 // 3 1:48 (default)
haoyan 0:08b2bdddf22e 166 // 4 1:40/1:34
haoyan 0:08b2bdddf22e 167 // 5 1:24
haoyan 0:08b2bdddf22e 168 // 6 1:18/1:16
haoyan 0:08b2bdddf22e 169 // 7 1:10/1:9/1:8
haoyan 0:08b2bdddf22e 170
haoyan 0:08b2bdddf22e 171 // enforce limits
haoyan 0:08b2bdddf22e 172 if (bias>7) {
haoyan 0:08b2bdddf22e 173 bias=7;
haoyan 0:08b2bdddf22e 174 }
haoyan 0:08b2bdddf22e 175
haoyan 0:08b2bdddf22e 176 sendCommand(0b00100001); // extended mode instruction
haoyan 0:08b2bdddf22e 177 sendCommand(0b00010000 | bias);
haoyan 0:08b2bdddf22e 178 sendCommand(0b00100000); // end of extended mode instruction
haoyan 0:08b2bdddf22e 179 }
haoyan 0:08b2bdddf22e 180
haoyan 0:08b2bdddf22e 181 // pulse the active low reset line
haoyan 0:08b2bdddf22e 182 void N5110::reset()
haoyan 0:08b2bdddf22e 183 {
haoyan 0:08b2bdddf22e 184 _rst->write(0); // reset the LCD
haoyan 0:08b2bdddf22e 185 _rst->write(1);
haoyan 0:08b2bdddf22e 186 }
haoyan 0:08b2bdddf22e 187
haoyan 0:08b2bdddf22e 188 // function to initialise SPI peripheral
haoyan 0:08b2bdddf22e 189 void N5110::initSPI()
haoyan 0:08b2bdddf22e 190 {
haoyan 0:08b2bdddf22e 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
haoyan 0:08b2bdddf22e 192 _spi->frequency(4000000); // maximum of screen is 4 MHz
haoyan 0:08b2bdddf22e 193 }
haoyan 0:08b2bdddf22e 194
haoyan 0:08b2bdddf22e 195 // send a command to the display
haoyan 0:08b2bdddf22e 196 void N5110::sendCommand(unsigned char command)
haoyan 0:08b2bdddf22e 197 {
haoyan 0:08b2bdddf22e 198 _dc->write(0); // set DC low for command
haoyan 0:08b2bdddf22e 199 _sce->write(0); // set CE low to begin frame
haoyan 0:08b2bdddf22e 200 _spi->write(command); // send command
haoyan 0:08b2bdddf22e 201 _dc->write(1); // turn back to data by default
haoyan 0:08b2bdddf22e 202 _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
haoyan 0:08b2bdddf22e 203 }
haoyan 0:08b2bdddf22e 204
haoyan 0:08b2bdddf22e 205 // send data to the display at the current XY address
haoyan 0:08b2bdddf22e 206 // dc is set to 1 (i.e. data) after sending a command and so should
haoyan 0:08b2bdddf22e 207 // be the default mode.
haoyan 0:08b2bdddf22e 208 void N5110::sendData(unsigned char data)
haoyan 0:08b2bdddf22e 209 {
haoyan 0:08b2bdddf22e 210 _sce->write(0); // set CE low to begin frame
haoyan 0:08b2bdddf22e 211 _spi->write(data);
haoyan 0:08b2bdddf22e 212 _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
haoyan 0:08b2bdddf22e 213 }
haoyan 0:08b2bdddf22e 214
haoyan 0:08b2bdddf22e 215 // this function writes 0 to the 504 bytes to clear the RAM
haoyan 0:08b2bdddf22e 216 void N5110::clearRAM()
haoyan 0:08b2bdddf22e 217 {
haoyan 0:08b2bdddf22e 218 _sce->write(0); //set CE low to begin frame
haoyan 0:08b2bdddf22e 219 for(int i = 0; i < WIDTH * HEIGHT; i++) { // 48 x 84 bits = 504 bytes
haoyan 0:08b2bdddf22e 220 _spi->write(0x00); // send 0's
haoyan 0:08b2bdddf22e 221 }
haoyan 0:08b2bdddf22e 222 _sce->write(1); // set CE high to end frame
haoyan 0:08b2bdddf22e 223 }
haoyan 0:08b2bdddf22e 224
haoyan 0:08b2bdddf22e 225 // function to set the XY address in RAM for subsequenct data write
haoyan 0:08b2bdddf22e 226 void N5110::setXYAddress(unsigned int const x,
haoyan 0:08b2bdddf22e 227 unsigned int const y)
haoyan 0:08b2bdddf22e 228 {
haoyan 0:08b2bdddf22e 229 if (x<WIDTH && y<HEIGHT) { // check within range
haoyan 0:08b2bdddf22e 230 sendCommand(0b00100000); // basic instruction
haoyan 0:08b2bdddf22e 231 sendCommand(0b10000000 | x); // send addresses to display with relevant mask
haoyan 0:08b2bdddf22e 232 sendCommand(0b01000000 | y);
haoyan 0:08b2bdddf22e 233 }
haoyan 0:08b2bdddf22e 234 }
haoyan 0:08b2bdddf22e 235
haoyan 0:08b2bdddf22e 236 // These functions are used to set, clear and get the value of pixels in the display
haoyan 0:08b2bdddf22e 237 // Pixels are addressed in the range of 0 to 47 (y) and 0 to 83 (x). The refresh()
haoyan 0:08b2bdddf22e 238 // function must be called after set and clear in order to update the display
haoyan 0:08b2bdddf22e 239 void N5110::setPixel(unsigned int const x,
haoyan 0:08b2bdddf22e 240 unsigned int const y,
haoyan 0:08b2bdddf22e 241 bool const state)
haoyan 0:08b2bdddf22e 242 {
haoyan 0:08b2bdddf22e 243 if (x<WIDTH && y<HEIGHT) { // check within range
haoyan 0:08b2bdddf22e 244 // calculate bank and shift 1 to required position in the data byte
haoyan 0:08b2bdddf22e 245 if(state) buffer[x][y/8] |= (1 << y%8);
haoyan 0:08b2bdddf22e 246 else buffer[x][y/8] &= ~(1 << y%8);
haoyan 0:08b2bdddf22e 247 }
haoyan 0:08b2bdddf22e 248 }
haoyan 0:08b2bdddf22e 249
haoyan 0:08b2bdddf22e 250 void N5110::clearPixel(unsigned int const x,
haoyan 0:08b2bdddf22e 251 unsigned int const y)
haoyan 0:08b2bdddf22e 252 {
haoyan 0:08b2bdddf22e 253 if (x<WIDTH && y<HEIGHT) { // check within range
haoyan 0:08b2bdddf22e 254 // calculate bank and shift 1 to required position (using bit clear)
haoyan 0:08b2bdddf22e 255 buffer[x][y/8] &= ~(1 << y%8);
haoyan 0:08b2bdddf22e 256 }
haoyan 0:08b2bdddf22e 257 }
haoyan 0:08b2bdddf22e 258
haoyan 0:08b2bdddf22e 259 int N5110::getPixel(unsigned int const x,
haoyan 0:08b2bdddf22e 260 unsigned int const y) const
haoyan 0:08b2bdddf22e 261 {
haoyan 0:08b2bdddf22e 262 if (x<WIDTH && y<HEIGHT) { // check within range
haoyan 0:08b2bdddf22e 263 // return relevant bank and mask required bit
haoyan 0:08b2bdddf22e 264
haoyan 0:08b2bdddf22e 265 int pixel = (int) buffer[x][y/8] & (1 << y%8);
haoyan 0:08b2bdddf22e 266
haoyan 0:08b2bdddf22e 267 if (pixel)
haoyan 0:08b2bdddf22e 268 return 1;
haoyan 0:08b2bdddf22e 269 else
haoyan 0:08b2bdddf22e 270 return 0;
haoyan 0:08b2bdddf22e 271 }
haoyan 0:08b2bdddf22e 272
haoyan 0:08b2bdddf22e 273 return 0;
haoyan 0:08b2bdddf22e 274
haoyan 0:08b2bdddf22e 275 }
haoyan 0:08b2bdddf22e 276
haoyan 0:08b2bdddf22e 277 // function to refresh the display
haoyan 0:08b2bdddf22e 278 void N5110::refresh()
haoyan 0:08b2bdddf22e 279 {
haoyan 0:08b2bdddf22e 280 setXYAddress(0,0); // important to set address back to 0,0 before refreshing display
haoyan 0:08b2bdddf22e 281 // address auto increments after printing string, so buffer[0][0] will not coincide
haoyan 0:08b2bdddf22e 282 // with top-left pixel after priting string
haoyan 0:08b2bdddf22e 283
haoyan 0:08b2bdddf22e 284 _sce->write(0); //set CE low to begin frame
haoyan 0:08b2bdddf22e 285
haoyan 0:08b2bdddf22e 286 for(int j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
haoyan 0:08b2bdddf22e 287 for(int i = 0; i < WIDTH; i++) {
haoyan 0:08b2bdddf22e 288 _spi->write(buffer[i][j]); // send buffer
haoyan 0:08b2bdddf22e 289 }
haoyan 0:08b2bdddf22e 290 }
haoyan 0:08b2bdddf22e 291 _sce->write(1); // set CE high to end frame
haoyan 0:08b2bdddf22e 292
haoyan 0:08b2bdddf22e 293 }
haoyan 0:08b2bdddf22e 294
haoyan 0:08b2bdddf22e 295 // fills the buffer with random bytes. Can be used to test the display.
haoyan 0:08b2bdddf22e 296 // The rand() function isn't seeded so it probably creates the same pattern everytime
haoyan 0:08b2bdddf22e 297 void N5110::randomiseBuffer()
haoyan 0:08b2bdddf22e 298 {
haoyan 0:08b2bdddf22e 299 int i,j;
haoyan 0:08b2bdddf22e 300 for(j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
haoyan 0:08b2bdddf22e 301 for(i = 0; i < WIDTH; i++) {
haoyan 0:08b2bdddf22e 302 buffer[i][j] = rand()%256; // generate random byte
haoyan 0:08b2bdddf22e 303 }
haoyan 0:08b2bdddf22e 304 }
haoyan 0:08b2bdddf22e 305
haoyan 0:08b2bdddf22e 306 }
haoyan 0:08b2bdddf22e 307
haoyan 0:08b2bdddf22e 308 // function to print 5x7 font
haoyan 0:08b2bdddf22e 309 void N5110::printChar(char const c,
haoyan 0:08b2bdddf22e 310 unsigned int const x,
haoyan 0:08b2bdddf22e 311 unsigned int const y)
haoyan 0:08b2bdddf22e 312 {
haoyan 0:08b2bdddf22e 313 if (y<BANKS) { // check if printing in range of y banks
haoyan 0:08b2bdddf22e 314
haoyan 0:08b2bdddf22e 315 for (int i = 0; i < 5 ; i++ ) {
haoyan 0:08b2bdddf22e 316 int pixel_x = x+i;
haoyan 0:08b2bdddf22e 317 if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83)
haoyan 0:08b2bdddf22e 318 break;
haoyan 0:08b2bdddf22e 319 buffer[pixel_x][y] = font5x7[(c - 32)*5 + i];
haoyan 0:08b2bdddf22e 320 // array is offset by 32 relative to ASCII, each character is 5 pixels wide
haoyan 0:08b2bdddf22e 321 }
haoyan 0:08b2bdddf22e 322
haoyan 0:08b2bdddf22e 323 }
haoyan 0:08b2bdddf22e 324 }
haoyan 0:08b2bdddf22e 325
haoyan 0:08b2bdddf22e 326 // function to print string at specified position
haoyan 0:08b2bdddf22e 327 void N5110::printString(const char *str,
haoyan 0:08b2bdddf22e 328 unsigned int const x,
haoyan 0:08b2bdddf22e 329 unsigned int const y)
haoyan 0:08b2bdddf22e 330 {
haoyan 0:08b2bdddf22e 331 if (y<BANKS) { // check if printing in range of y banks
haoyan 0:08b2bdddf22e 332
haoyan 0:08b2bdddf22e 333 int n = 0 ; // counter for number of characters in string
haoyan 0:08b2bdddf22e 334 // loop through string and print character
haoyan 0:08b2bdddf22e 335 while(*str) {
haoyan 0:08b2bdddf22e 336
haoyan 0:08b2bdddf22e 337 // writes the character bitmap data to the buffer, so that
haoyan 0:08b2bdddf22e 338 // text and pixels can be displayed at the same time
haoyan 0:08b2bdddf22e 339 for (int i = 0; i < 5 ; i++ ) {
haoyan 0:08b2bdddf22e 340 int pixel_x = x+i+n*6;
haoyan 0:08b2bdddf22e 341 if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83)
haoyan 0:08b2bdddf22e 342 break;
haoyan 0:08b2bdddf22e 343 buffer[pixel_x][y] = font5x7[(*str - 32)*5 + i];
haoyan 0:08b2bdddf22e 344 }
haoyan 0:08b2bdddf22e 345 str++; // go to next character in string
haoyan 0:08b2bdddf22e 346 n++; // increment index
haoyan 0:08b2bdddf22e 347 }
haoyan 0:08b2bdddf22e 348 }
haoyan 0:08b2bdddf22e 349 }
haoyan 0:08b2bdddf22e 350
haoyan 0:08b2bdddf22e 351 // function to clear the screen buffer
haoyan 0:08b2bdddf22e 352 void N5110::clear()
haoyan 0:08b2bdddf22e 353 {
haoyan 0:08b2bdddf22e 354 memset(buffer,0,sizeof(buffer));
haoyan 0:08b2bdddf22e 355 }
haoyan 0:08b2bdddf22e 356
haoyan 0:08b2bdddf22e 357 // function to plot array on display
haoyan 0:08b2bdddf22e 358 void N5110::plotArray(float const array[])
haoyan 0:08b2bdddf22e 359 {
haoyan 0:08b2bdddf22e 360 for (int i=0; i<WIDTH; i++) { // loop through array
haoyan 0:08b2bdddf22e 361 // elements are normalised from 0.0 to 1.0, so multiply
haoyan 0:08b2bdddf22e 362 // by 47 to convert to pixel range, and subtract from 47
haoyan 0:08b2bdddf22e 363 // since top-left is 0,0 in the display geometry
haoyan 0:08b2bdddf22e 364 setPixel(i,47 - int(array[i]*47.0f),true);
haoyan 0:08b2bdddf22e 365 }
haoyan 0:08b2bdddf22e 366
haoyan 0:08b2bdddf22e 367 }
haoyan 0:08b2bdddf22e 368
haoyan 0:08b2bdddf22e 369 // function to draw circle
haoyan 0:08b2bdddf22e 370 void N5110:: drawCircle(unsigned int const x0,
haoyan 0:08b2bdddf22e 371 unsigned int const y0,
haoyan 0:08b2bdddf22e 372 unsigned int const radius,
haoyan 0:08b2bdddf22e 373 FillType const fill)
haoyan 0:08b2bdddf22e 374 {
haoyan 0:08b2bdddf22e 375 // from http://en.wikipedia.org/wiki/Midpoint_circle_algorithm
haoyan 0:08b2bdddf22e 376 int x = radius;
haoyan 0:08b2bdddf22e 377 int y = 0;
haoyan 0:08b2bdddf22e 378 int radiusError = 1-x;
haoyan 0:08b2bdddf22e 379
haoyan 0:08b2bdddf22e 380 while(x >= y) {
haoyan 0:08b2bdddf22e 381
haoyan 0:08b2bdddf22e 382 // if transparent, just draw outline
haoyan 0:08b2bdddf22e 383 if (fill == FILL_TRANSPARENT) {
haoyan 0:08b2bdddf22e 384 setPixel( x + x0, y + y0,true);
haoyan 0:08b2bdddf22e 385 setPixel(-x + x0, y + y0,true);
haoyan 0:08b2bdddf22e 386 setPixel( y + x0, x + y0,true);
haoyan 0:08b2bdddf22e 387 setPixel(-y + x0, x + y0,true);
haoyan 0:08b2bdddf22e 388 setPixel(-y + x0, -x + y0,true);
haoyan 0:08b2bdddf22e 389 setPixel( y + x0, -x + y0,true);
haoyan 0:08b2bdddf22e 390 setPixel( x + x0, -y + y0,true);
haoyan 0:08b2bdddf22e 391 setPixel(-x + x0, -y + y0,true);
haoyan 0:08b2bdddf22e 392 } else { // drawing filled circle, so draw lines between points at same y value
haoyan 0:08b2bdddf22e 393
haoyan 0:08b2bdddf22e 394 int type = (fill==FILL_BLACK) ? 1:0; // black or white fill
haoyan 0:08b2bdddf22e 395
haoyan 0:08b2bdddf22e 396 drawLine(x+x0,y+y0,-x+x0,y+y0,type);
haoyan 0:08b2bdddf22e 397 drawLine(y+x0,x+y0,-y+x0,x+y0,type);
haoyan 0:08b2bdddf22e 398 drawLine(y+x0,-x+y0,-y+x0,-x+y0,type);
haoyan 0:08b2bdddf22e 399 drawLine(x+x0,-y+y0,-x+x0,-y+y0,type);
haoyan 0:08b2bdddf22e 400 }
haoyan 0:08b2bdddf22e 401
haoyan 0:08b2bdddf22e 402 y++;
haoyan 0:08b2bdddf22e 403 if (radiusError<0) {
haoyan 0:08b2bdddf22e 404 radiusError += 2 * y + 1;
haoyan 0:08b2bdddf22e 405 } else {
haoyan 0:08b2bdddf22e 406 x--;
haoyan 0:08b2bdddf22e 407 radiusError += 2 * (y - x) + 1;
haoyan 0:08b2bdddf22e 408 }
haoyan 0:08b2bdddf22e 409 }
haoyan 0:08b2bdddf22e 410
haoyan 0:08b2bdddf22e 411 }
haoyan 0:08b2bdddf22e 412
haoyan 0:08b2bdddf22e 413 void N5110::drawLine(unsigned int const x0,
haoyan 0:08b2bdddf22e 414 unsigned int const y0,
haoyan 0:08b2bdddf22e 415 unsigned int const x1,
haoyan 0:08b2bdddf22e 416 unsigned int const y1,
haoyan 0:08b2bdddf22e 417 unsigned int const type)
haoyan 0:08b2bdddf22e 418 {
haoyan 0:08b2bdddf22e 419 // Note that the ranges can be negative so we have to turn the input values
haoyan 0:08b2bdddf22e 420 // into signed integers first
haoyan 0:08b2bdddf22e 421 int const y_range = static_cast<int>(y1) - static_cast<int>(y0);
haoyan 0:08b2bdddf22e 422 int const x_range = static_cast<int>(x1) - static_cast<int>(x0);
haoyan 0:08b2bdddf22e 423
haoyan 0:08b2bdddf22e 424 // if dotted line, set step to 2, else step is 1
haoyan 0:08b2bdddf22e 425 unsigned int const step = (type==2) ? 2:1;
haoyan 0:08b2bdddf22e 426
haoyan 0:08b2bdddf22e 427 // make sure we loop over the largest range to get the most pixels on the display
haoyan 0:08b2bdddf22e 428 // for instance, if drawing a vertical line (x_range = 0), we need to loop down the y pixels
haoyan 0:08b2bdddf22e 429 // or else we'll only end up with 1 pixel in the x column
haoyan 0:08b2bdddf22e 430 if ( abs(x_range) > abs(y_range) ) {
haoyan 0:08b2bdddf22e 431
haoyan 0:08b2bdddf22e 432 // ensure we loop from smallest to largest or else for-loop won't run as expected
haoyan 0:08b2bdddf22e 433 unsigned int const start = x_range > 0 ? x0:x1;
haoyan 0:08b2bdddf22e 434 unsigned int const stop = x_range > 0 ? x1:x0;
haoyan 0:08b2bdddf22e 435
haoyan 0:08b2bdddf22e 436 // loop between x pixels
haoyan 0:08b2bdddf22e 437 for (unsigned int x = start; x<= stop ; x+=step) {
haoyan 0:08b2bdddf22e 438 // do linear interpolation
haoyan 0:08b2bdddf22e 439 int const dx = static_cast<int>(x)-static_cast<int>(x0);
haoyan 0:08b2bdddf22e 440 unsigned int const y = y0 + y_range * dx / x_range;
haoyan 0:08b2bdddf22e 441
haoyan 0:08b2bdddf22e 442 // If the line type is '0', this will clear the pixel
haoyan 0:08b2bdddf22e 443 // If it is '1' or '2', the pixel will be set
haoyan 0:08b2bdddf22e 444 setPixel(x,y, type);
haoyan 0:08b2bdddf22e 445 }
haoyan 0:08b2bdddf22e 446 } else {
haoyan 0:08b2bdddf22e 447
haoyan 0:08b2bdddf22e 448 // ensure we loop from smallest to largest or else for-loop won't run as expected
haoyan 0:08b2bdddf22e 449 unsigned int const start = y_range > 0 ? y0:y1;
haoyan 0:08b2bdddf22e 450 unsigned int const stop = y_range > 0 ? y1:y0;
haoyan 0:08b2bdddf22e 451
haoyan 0:08b2bdddf22e 452 for (unsigned int y = start; y<= stop ; y+=step) {
haoyan 0:08b2bdddf22e 453 // do linear interpolation
haoyan 0:08b2bdddf22e 454 int const dy = static_cast<int>(y)-static_cast<int>(y0);
haoyan 0:08b2bdddf22e 455 unsigned int const x = x0 + x_range * dy / y_range;
haoyan 0:08b2bdddf22e 456
haoyan 0:08b2bdddf22e 457 // If the line type is '0', this will clear the pixel
haoyan 0:08b2bdddf22e 458 // If it is '1' or '2', the pixel will be set
haoyan 0:08b2bdddf22e 459 setPixel(x,y, type);
haoyan 0:08b2bdddf22e 460 }
haoyan 0:08b2bdddf22e 461 }
haoyan 0:08b2bdddf22e 462
haoyan 0:08b2bdddf22e 463 }
haoyan 0:08b2bdddf22e 464
haoyan 0:08b2bdddf22e 465 void N5110::drawRect(unsigned int const x0,
haoyan 0:08b2bdddf22e 466 unsigned int const y0,
haoyan 0:08b2bdddf22e 467 unsigned int const width,
haoyan 0:08b2bdddf22e 468 unsigned int const height,
haoyan 0:08b2bdddf22e 469 FillType const fill)
haoyan 0:08b2bdddf22e 470 {
haoyan 0:08b2bdddf22e 471 if (fill == FILL_TRANSPARENT) { // transparent, just outline
haoyan 0:08b2bdddf22e 472 drawLine(x0,y0,x0+(width-1),y0,1); // top
haoyan 0:08b2bdddf22e 473 drawLine(x0,y0+(height-1),x0+(width-1),y0+(height-1),1); // bottom
haoyan 0:08b2bdddf22e 474 drawLine(x0,y0,x0,y0+(height-1),1); // left
haoyan 0:08b2bdddf22e 475 drawLine(x0+(width-1),y0,x0+(width-1),y0+(height-1),1); // right
haoyan 0:08b2bdddf22e 476 } else { // filled rectangle
haoyan 0:08b2bdddf22e 477 int type = (fill==FILL_BLACK) ? 1:0; // black or white fill
haoyan 0:08b2bdddf22e 478 for (int y = y0; y<y0+height; y++) { // loop through rows of rectangle
haoyan 0:08b2bdddf22e 479 drawLine(x0,y,x0+(width-1),y,type); // draw line across screen
haoyan 0:08b2bdddf22e 480 }
haoyan 0:08b2bdddf22e 481 }
haoyan 0:08b2bdddf22e 482 }
haoyan 0:08b2bdddf22e 483
haoyan 0:08b2bdddf22e 484 void N5110::drawSprite(int x0,
haoyan 0:08b2bdddf22e 485 int y0,
haoyan 0:08b2bdddf22e 486 int nrows,
haoyan 0:08b2bdddf22e 487 int ncols,
haoyan 0:08b2bdddf22e 488 int *sprite)
haoyan 0:08b2bdddf22e 489 {
haoyan 0:08b2bdddf22e 490 for (int i = 0; i < nrows; i++) {
haoyan 0:08b2bdddf22e 491 for (int j = 0 ; j < ncols ; j++) {
haoyan 0:08b2bdddf22e 492
haoyan 0:08b2bdddf22e 493 int pixel = *((sprite+i*ncols)+j);
haoyan 0:08b2bdddf22e 494 setPixel(x0+j,y0+i, pixel);
haoyan 0:08b2bdddf22e 495 }
haoyan 0:08b2bdddf22e 496 }
haoyan 0:08b2bdddf22e 497 }