XJEL2645 (19/20) / Mbed 2 deprecated el17zy

Yang Zhenye 201199680

Dependencies:   mbed

N5110/N5110.cpp@5:fcad75e9b9e1, 2020-05-14 (annotated)

Committer:
yangzhenye
Date:
Thu May 14 14:13:03 2020 +0000
Revision:
5:fcad75e9b9e1
Parent:
0:ac2868313b41 
first

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yangzhenye 0:ac2868313b41 1 #include "mbed.h"
yangzhenye 0:ac2868313b41 2 #include "N5110.h"
yangzhenye 5:fcad75e9b9e1 3
yangzhenye 0:ac2868313b41 4 // overloaded constructor includes power pin - LCD Vcc connected to GPIO pin
yangzhenye 0:ac2868313b41 5 // this constructor works fine with LPC1768 - enough current sourced from GPIO
yangzhenye 0:ac2868313b41 6 // to power LCD. Doesn't work well with K64F.
yangzhenye 0:ac2868313b41 7 N5110::N5110(PinName const pwrPin,
yangzhenye 0:ac2868313b41 8 PinName const scePin,
yangzhenye 0:ac2868313b41 9 PinName const rstPin,
yangzhenye 0:ac2868313b41 10 PinName const dcPin,
yangzhenye 0:ac2868313b41 11 PinName const mosiPin,
yangzhenye 0:ac2868313b41 12 PinName const sclkPin,
yangzhenye 0:ac2868313b41 13 PinName const ledPin)
yangzhenye 0:ac2868313b41 14 :
yangzhenye 0:ac2868313b41 15 _spi(new SPI(mosiPin,NC,sclkPin)), // create new SPI instance and initialise
yangzhenye 0:ac2868313b41 16 _led(new PwmOut(ledPin)),
yangzhenye 0:ac2868313b41 17 _pwr(new DigitalOut(pwrPin)),
yangzhenye 0:ac2868313b41 18 _sce(new DigitalOut(scePin)),
yangzhenye 0:ac2868313b41 19 _rst(new DigitalOut(rstPin)),
yangzhenye 0:ac2868313b41 20 _dc(new DigitalOut(dcPin))
yangzhenye 0:ac2868313b41 21 {}
yangzhenye 5:fcad75e9b9e1 22
yangzhenye 0:ac2868313b41 23 // overloaded constructor does not include power pin - LCD Vcc must be tied to +3V3
yangzhenye 0:ac2868313b41 24 // Best to use this with K64F as the GPIO hasn't sufficient output current to reliably
yangzhenye 0:ac2868313b41 25 // drive the LCD.
yangzhenye 0:ac2868313b41 26 N5110::N5110(PinName const scePin,
yangzhenye 0:ac2868313b41 27 PinName const rstPin,
yangzhenye 0:ac2868313b41 28 PinName const dcPin,
yangzhenye 0:ac2868313b41 29 PinName const mosiPin,
yangzhenye 0:ac2868313b41 30 PinName const sclkPin,
yangzhenye 0:ac2868313b41 31 PinName const ledPin)
yangzhenye 0:ac2868313b41 32 :
yangzhenye 0:ac2868313b41 33 _spi(new SPI(mosiPin,NC,sclkPin)), // create new SPI instance and initialise
yangzhenye 0:ac2868313b41 34 _led(new PwmOut(ledPin)),
yangzhenye 0:ac2868313b41 35 _pwr(NULL), // pwr not needed so null it to be safe
yangzhenye 0:ac2868313b41 36 _sce(new DigitalOut(scePin)),
yangzhenye 0:ac2868313b41 37 _rst(new DigitalOut(rstPin)),
yangzhenye 0:ac2868313b41 38 _dc(new DigitalOut(dcPin))
yangzhenye 0:ac2868313b41 39 {}
yangzhenye 5:fcad75e9b9e1 40
yangzhenye 0:ac2868313b41 41 N5110::~N5110()
yangzhenye 0:ac2868313b41 42 {
yangzhenye 0:ac2868313b41 43 delete _spi;
yangzhenye 5:fcad75e9b9e1 44
yangzhenye 0:ac2868313b41 45 if(_pwr) {
yangzhenye 0:ac2868313b41 46 delete _pwr;
yangzhenye 0:ac2868313b41 47 }
yangzhenye 5:fcad75e9b9e1 48
yangzhenye 0:ac2868313b41 49 delete _led;
yangzhenye 0:ac2868313b41 50 delete _sce;
yangzhenye 0:ac2868313b41 51 delete _rst;
yangzhenye 0:ac2868313b41 52 delete _dc;
yangzhenye 0:ac2868313b41 53 }
yangzhenye 5:fcad75e9b9e1 54
yangzhenye 0:ac2868313b41 55 // initialise function - powers up and sends the initialisation commands
yangzhenye 0:ac2868313b41 56 void N5110::init()
yangzhenye 0:ac2868313b41 57 {
yangzhenye 0:ac2868313b41 58 turnOn(); // power up
yangzhenye 0:ac2868313b41 59 reset(); // reset LCD - must be done within 100 ms
yangzhenye 5:fcad75e9b9e1 60 initSPI();
yangzhenye 5:fcad75e9b9e1 61
yangzhenye 5:fcad75e9b9e1 62 setContrast(0.55); // this may need tuning (say 0.4 to 0.6)
yangzhenye 5:fcad75e9b9e1 63 setBias(3); // datasheet - 48:1 mux - don't mess with if you don't know what you're doing! (0 to 7)
yangzhenye 5:fcad75e9b9e1 64 setTempCoefficient(0); // datasheet - may need increasing (range 0 to 3) at very low temperatures
yangzhenye 0:ac2868313b41 65 normalMode(); // normal video mode by default
yangzhenye 5:fcad75e9b9e1 66
yangzhenye 5:fcad75e9b9e1 67 clearRAM(); // RAM is undefined at power-up so clear to be sure
yangzhenye 0:ac2868313b41 68 clear(); // clear buffer
yangzhenye 0:ac2868313b41 69 setBrightness(0.5);
yangzhenye 0:ac2868313b41 70 }
yangzhenye 5:fcad75e9b9e1 71
yangzhenye 0:ac2868313b41 72 // sets normal video mode (black on white)
yangzhenye 0:ac2868313b41 73 void N5110::normalMode()
yangzhenye 0:ac2868313b41 74 {
yangzhenye 5:fcad75e9b9e1 75 sendCommand(0b00100000); // basic instruction
yangzhenye 5:fcad75e9b9e1 76 sendCommand(0b00001100); // normal video mode- datasheet
yangzhenye 0:ac2868313b41 77 }
yangzhenye 5:fcad75e9b9e1 78
yangzhenye 0:ac2868313b41 79 // sets normal video mode (white on black)
yangzhenye 0:ac2868313b41 80 void N5110::inverseMode()
yangzhenye 0:ac2868313b41 81 {
yangzhenye 5:fcad75e9b9e1 82 sendCommand(0b00100000); // basic instruction
yangzhenye 5:fcad75e9b9e1 83 sendCommand(0b00001101); // inverse video mode - datasheet
yangzhenye 0:ac2868313b41 84 }
yangzhenye 5:fcad75e9b9e1 85
yangzhenye 0:ac2868313b41 86 // function to power up the LCD and backlight - only works when using GPIO to power
yangzhenye 0:ac2868313b41 87 void N5110::turnOn()
yangzhenye 0:ac2868313b41 88 {
yangzhenye 0:ac2868313b41 89 if (_pwr != NULL) {
yangzhenye 0:ac2868313b41 90 _pwr->write(1); // apply power
yangzhenye 0:ac2868313b41 91 }
yangzhenye 0:ac2868313b41 92 }
yangzhenye 5:fcad75e9b9e1 93
yangzhenye 0:ac2868313b41 94 // function to power down LCD
yangzhenye 0:ac2868313b41 95 void N5110::turnOff()
yangzhenye 0:ac2868313b41 96 {
yangzhenye 0:ac2868313b41 97 clear(); // clear buffer
yangzhenye 0:ac2868313b41 98 refresh();
yangzhenye 0:ac2868313b41 99 setBrightness(0.0); // turn backlight off
yangzhenye 0:ac2868313b41 100 clearRAM(); // clear RAM to ensure specified current consumption
yangzhenye 0:ac2868313b41 101 // send command to ensure we are in basic mode
yangzhenye 5:fcad75e9b9e1 102
yangzhenye 5:fcad75e9b9e1 103 sendCommand(0b00100000); // basic mode
yangzhenye 5:fcad75e9b9e1 104 sendCommand(0b00001000); // clear display
yangzhenye 5:fcad75e9b9e1 105 sendCommand(0b00100001); // extended mode
yangzhenye 5:fcad75e9b9e1 106 sendCommand(0b00100100); // power down
yangzhenye 5:fcad75e9b9e1 107
yangzhenye 0:ac2868313b41 108 // if we are powering the LCD using the GPIO then make it low to turn off
yangzhenye 0:ac2868313b41 109 if (_pwr != NULL) {
yangzhenye 5:fcad75e9b9e1 110 wait_ms(10); // small delay and then turn off the power pin
yangzhenye 0:ac2868313b41 111 _pwr->write(0); // turn off power
yangzhenye 0:ac2868313b41 112 }
yangzhenye 5:fcad75e9b9e1 113
yangzhenye 0:ac2868313b41 114 }
yangzhenye 5:fcad75e9b9e1 115
yangzhenye 0:ac2868313b41 116 // function to change LED backlight brightness
yangzhenye 0:ac2868313b41 117 void N5110::setBrightness(float brightness)
yangzhenye 0:ac2868313b41 118 {
yangzhenye 0:ac2868313b41 119 // check whether brightness is within range
yangzhenye 0:ac2868313b41 120 if (brightness < 0.0f)
yangzhenye 0:ac2868313b41 121 brightness = 0.0f;
yangzhenye 0:ac2868313b41 122 if (brightness > 1.0f)
yangzhenye 0:ac2868313b41 123 brightness = 1.0f;
yangzhenye 0:ac2868313b41 124 // set PWM duty cycle
yangzhenye 0:ac2868313b41 125 _led->write(brightness);
yangzhenye 0:ac2868313b41 126 }
yangzhenye 5:fcad75e9b9e1 127
yangzhenye 5:fcad75e9b9e1 128 void N5110::setContrast(float contrast) {
yangzhenye 5:fcad75e9b9e1 129
yangzhenye 5:fcad75e9b9e1 130 // enforce limits
yangzhenye 5:fcad75e9b9e1 131 if (contrast > 1.0f)
yangzhenye 5:fcad75e9b9e1 132 contrast = 1.0f;
yangzhenye 5:fcad75e9b9e1 133 else if (contrast < 0.0f)
yangzhenye 5:fcad75e9b9e1 134 contrast = 0.0;
yangzhenye 5:fcad75e9b9e1 135
yangzhenye 5:fcad75e9b9e1 136 // convert to char in range 0 to 127 (i.e. 6 bits)
yangzhenye 5:fcad75e9b9e1 137 char ic = char(contrast*127.0f);
yangzhenye 5:fcad75e9b9e1 138
yangzhenye 5:fcad75e9b9e1 139 sendCommand(0b00100001); // extended instruction set
yangzhenye 5:fcad75e9b9e1 140 sendCommand(0b10000000 | ic); // set Vop (which controls contrast)
yangzhenye 5:fcad75e9b9e1 141 sendCommand(0b00100000); // back to basic instruction set
yangzhenye 5:fcad75e9b9e1 142 }
yangzhenye 5:fcad75e9b9e1 143
yangzhenye 5:fcad75e9b9e1 144 void N5110::setTempCoefficient(char tc) {
yangzhenye 5:fcad75e9b9e1 145
yangzhenye 5:fcad75e9b9e1 146 // enforce limits
yangzhenye 5:fcad75e9b9e1 147 if (tc>3) {
yangzhenye 5:fcad75e9b9e1 148 tc=3;
yangzhenye 5:fcad75e9b9e1 149 }
yangzhenye 5:fcad75e9b9e1 150
yangzhenye 5:fcad75e9b9e1 151 // temperature coefficient may need increasing at low temperatures
yangzhenye 5:fcad75e9b9e1 152
yangzhenye 5:fcad75e9b9e1 153 sendCommand(0b00100001); // extended instruction set
yangzhenye 5:fcad75e9b9e1 154 sendCommand(0b00000100 | tc);
yangzhenye 5:fcad75e9b9e1 155 sendCommand(0b00100000); // back to basic instruction set
yangzhenye 5:fcad75e9b9e1 156 }
yangzhenye 5:fcad75e9b9e1 157
yangzhenye 5:fcad75e9b9e1 158 void N5110::setBias(char bias) {
yangzhenye 5:fcad75e9b9e1 159
yangzhenye 5:fcad75e9b9e1 160 // from data sheet
yangzhenye 5:fcad75e9b9e1 161 // bias mux rate
yangzhenye 5:fcad75e9b9e1 162 // 0 1:100
yangzhenye 5:fcad75e9b9e1 163 // 1 1:80
yangzhenye 5:fcad75e9b9e1 164 // 2 1:65
yangzhenye 5:fcad75e9b9e1 165 // 3 1:48 (default)
yangzhenye 5:fcad75e9b9e1 166 // 4 1:40/1:34
yangzhenye 5:fcad75e9b9e1 167 // 5 1:24
yangzhenye 5:fcad75e9b9e1 168 // 6 1:18/1:16
yangzhenye 5:fcad75e9b9e1 169 // 7 1:10/1:9/1:8
yangzhenye 5:fcad75e9b9e1 170
yangzhenye 5:fcad75e9b9e1 171 // enforce limits
yangzhenye 5:fcad75e9b9e1 172 if (bias>7) {
yangzhenye 5:fcad75e9b9e1 173 bias=7;
yangzhenye 5:fcad75e9b9e1 174 }
yangzhenye 5:fcad75e9b9e1 175
yangzhenye 5:fcad75e9b9e1 176 sendCommand(0b00100001); // extended mode instruction
yangzhenye 5:fcad75e9b9e1 177 sendCommand(0b00010000 | bias);
yangzhenye 5:fcad75e9b9e1 178 sendCommand(0b00100000); // end of extended mode instruction
yangzhenye 5:fcad75e9b9e1 179 }
yangzhenye 5:fcad75e9b9e1 180
yangzhenye 0:ac2868313b41 181 // pulse the active low reset line
yangzhenye 0:ac2868313b41 182 void N5110::reset()
yangzhenye 0:ac2868313b41 183 {
yangzhenye 0:ac2868313b41 184 _rst->write(0); // reset the LCD
yangzhenye 0:ac2868313b41 185 _rst->write(1);
yangzhenye 0:ac2868313b41 186 }
yangzhenye 5:fcad75e9b9e1 187
yangzhenye 0:ac2868313b41 188 // function to initialise SPI peripheral
yangzhenye 0:ac2868313b41 189 void N5110::initSPI()
yangzhenye 0:ac2868313b41 190 {
yangzhenye 0:ac2868313b41 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
yangzhenye 0:ac2868313b41 192 _spi->frequency(4000000); // maximum of screen is 4 MHz
yangzhenye 0:ac2868313b41 193 }
yangzhenye 5:fcad75e9b9e1 194
yangzhenye 0:ac2868313b41 195 // send a command to the display
yangzhenye 0:ac2868313b41 196 void N5110::sendCommand(unsigned char command)
yangzhenye 0:ac2868313b41 197 {
yangzhenye 0:ac2868313b41 198 _dc->write(0); // set DC low for command
yangzhenye 0:ac2868313b41 199 _sce->write(0); // set CE low to begin frame
yangzhenye 0:ac2868313b41 200 _spi->write(command); // send command
yangzhenye 0:ac2868313b41 201 _dc->write(1); // turn back to data by default
yangzhenye 0:ac2868313b41 202 _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
yangzhenye 0:ac2868313b41 203 }
yangzhenye 5:fcad75e9b9e1 204
yangzhenye 0:ac2868313b41 205 // send data to the display at the current XY address
yangzhenye 0:ac2868313b41 206 // dc is set to 1 (i.e. data) after sending a command and so should
yangzhenye 0:ac2868313b41 207 // be the default mode.
yangzhenye 0:ac2868313b41 208 void N5110::sendData(unsigned char data)
yangzhenye 0:ac2868313b41 209 {
yangzhenye 0:ac2868313b41 210 _sce->write(0); // set CE low to begin frame
yangzhenye 0:ac2868313b41 211 _spi->write(data);
yangzhenye 0:ac2868313b41 212 _sce->write(1); // set CE high to end frame (expected for transmission of single byte)
yangzhenye 0:ac2868313b41 213 }
yangzhenye 5:fcad75e9b9e1 214
yangzhenye 0:ac2868313b41 215 // this function writes 0 to the 504 bytes to clear the RAM
yangzhenye 0:ac2868313b41 216 void N5110::clearRAM()
yangzhenye 0:ac2868313b41 217 {
yangzhenye 0:ac2868313b41 218 _sce->write(0); //set CE low to begin frame
yangzhenye 0:ac2868313b41 219 for(int i = 0; i < WIDTH * HEIGHT; i++) { // 48 x 84 bits = 504 bytes
yangzhenye 0:ac2868313b41 220 _spi->write(0x00); // send 0's
yangzhenye 0:ac2868313b41 221 }
yangzhenye 0:ac2868313b41 222 _sce->write(1); // set CE high to end frame
yangzhenye 0:ac2868313b41 223 }
yangzhenye 5:fcad75e9b9e1 224
yangzhenye 0:ac2868313b41 225 // function to set the XY address in RAM for subsequenct data write
yangzhenye 0:ac2868313b41 226 void N5110::setXYAddress(unsigned int const x,
yangzhenye 0:ac2868313b41 227 unsigned int const y)
yangzhenye 0:ac2868313b41 228 {
yangzhenye 0:ac2868313b41 229 if (x<WIDTH && y<HEIGHT) { // check within range
yangzhenye 5:fcad75e9b9e1 230 sendCommand(0b00100000); // basic instruction
yangzhenye 5:fcad75e9b9e1 231 sendCommand(0b10000000 | x); // send addresses to display with relevant mask
yangzhenye 5:fcad75e9b9e1 232 sendCommand(0b01000000 | y);
yangzhenye 0:ac2868313b41 233 }
yangzhenye 0:ac2868313b41 234 }
yangzhenye 5:fcad75e9b9e1 235
yangzhenye 0:ac2868313b41 236 // These functions are used to set, clear and get the value of pixels in the display
yangzhenye 0:ac2868313b41 237 // Pixels are addressed in the range of 0 to 47 (y) and 0 to 83 (x). The refresh()
yangzhenye 0:ac2868313b41 238 // function must be called after set and clear in order to update the display
yangzhenye 0:ac2868313b41 239 void N5110::setPixel(unsigned int const x,
yangzhenye 5:fcad75e9b9e1 240 unsigned int const y,
yangzhenye 5:fcad75e9b9e1 241 bool const state)
yangzhenye 0:ac2868313b41 242 {
yangzhenye 0:ac2868313b41 243 if (x<WIDTH && y<HEIGHT) { // check within range
yangzhenye 0:ac2868313b41 244 // calculate bank and shift 1 to required position in the data byte
yangzhenye 5:fcad75e9b9e1 245 if(state) buffer[x][y/8] |= (1 << y%8);
yangzhenye 5:fcad75e9b9e1 246 else buffer[x][y/8] &= ~(1 << y%8);
yangzhenye 0:ac2868313b41 247 }
yangzhenye 0:ac2868313b41 248 }
yangzhenye 5:fcad75e9b9e1 249
yangzhenye 0:ac2868313b41 250 void N5110::clearPixel(unsigned int const x,
yangzhenye 0:ac2868313b41 251 unsigned int const y)
yangzhenye 0:ac2868313b41 252 {
yangzhenye 0:ac2868313b41 253 if (x<WIDTH && y<HEIGHT) { // check within range
yangzhenye 0:ac2868313b41 254 // calculate bank and shift 1 to required position (using bit clear)
yangzhenye 0:ac2868313b41 255 buffer[x][y/8] &= ~(1 << y%8);
yangzhenye 0:ac2868313b41 256 }
yangzhenye 0:ac2868313b41 257 }
yangzhenye 5:fcad75e9b9e1 258
yangzhenye 0:ac2868313b41 259 int N5110::getPixel(unsigned int const x,
yangzhenye 0:ac2868313b41 260 unsigned int const y) const
yangzhenye 0:ac2868313b41 261 {
yangzhenye 0:ac2868313b41 262 if (x<WIDTH && y<HEIGHT) { // check within range
yangzhenye 0:ac2868313b41 263 // return relevant bank and mask required bit
yangzhenye 5:fcad75e9b9e1 264
yangzhenye 0:ac2868313b41 265 int pixel = (int) buffer[x][y/8] & (1 << y%8);
yangzhenye 5:fcad75e9b9e1 266
yangzhenye 0:ac2868313b41 267 if (pixel)
yangzhenye 0:ac2868313b41 268 return 1;
yangzhenye 0:ac2868313b41 269 else
yangzhenye 0:ac2868313b41 270 return 0;
yangzhenye 0:ac2868313b41 271 }
yangzhenye 5:fcad75e9b9e1 272
yangzhenye 0:ac2868313b41 273 return 0;
yangzhenye 5:fcad75e9b9e1 274
yangzhenye 0:ac2868313b41 275 }
yangzhenye 5:fcad75e9b9e1 276
yangzhenye 0:ac2868313b41 277 // function to refresh the display
yangzhenye 0:ac2868313b41 278 void N5110::refresh()
yangzhenye 0:ac2868313b41 279 {
yangzhenye 0:ac2868313b41 280 setXYAddress(0,0); // important to set address back to 0,0 before refreshing display
yangzhenye 0:ac2868313b41 281 // address auto increments after printing string, so buffer[0][0] will not coincide
yangzhenye 0:ac2868313b41 282 // with top-left pixel after priting string
yangzhenye 5:fcad75e9b9e1 283
yangzhenye 0:ac2868313b41 284 _sce->write(0); //set CE low to begin frame
yangzhenye 5:fcad75e9b9e1 285
yangzhenye 0:ac2868313b41 286 for(int j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
yangzhenye 0:ac2868313b41 287 for(int i = 0; i < WIDTH; i++) {
yangzhenye 0:ac2868313b41 288 _spi->write(buffer[i][j]); // send buffer
yangzhenye 0:ac2868313b41 289 }
yangzhenye 0:ac2868313b41 290 }
yangzhenye 0:ac2868313b41 291 _sce->write(1); // set CE high to end frame
yangzhenye 5:fcad75e9b9e1 292
yangzhenye 0:ac2868313b41 293 }
yangzhenye 5:fcad75e9b9e1 294
yangzhenye 0:ac2868313b41 295 // fills the buffer with random bytes. Can be used to test the display.
yangzhenye 0:ac2868313b41 296 // The rand() function isn't seeded so it probably creates the same pattern everytime
yangzhenye 0:ac2868313b41 297 void N5110::randomiseBuffer()
yangzhenye 0:ac2868313b41 298 {
yangzhenye 0:ac2868313b41 299 int i,j;
yangzhenye 0:ac2868313b41 300 for(j = 0; j < BANKS; j++) { // be careful to use correct order (j,i) for horizontal addressing
yangzhenye 0:ac2868313b41 301 for(i = 0; i < WIDTH; i++) {
yangzhenye 0:ac2868313b41 302 buffer[i][j] = rand()%256; // generate random byte
yangzhenye 0:ac2868313b41 303 }
yangzhenye 0:ac2868313b41 304 }
yangzhenye 5:fcad75e9b9e1 305
yangzhenye 0:ac2868313b41 306 }
yangzhenye 5:fcad75e9b9e1 307
yangzhenye 0:ac2868313b41 308 // function to print 5x7 font
yangzhenye 0:ac2868313b41 309 void N5110::printChar(char const c,
yangzhenye 0:ac2868313b41 310 unsigned int const x,
yangzhenye 0:ac2868313b41 311 unsigned int const y)
yangzhenye 0:ac2868313b41 312 {
yangzhenye 0:ac2868313b41 313 if (y<BANKS) { // check if printing in range of y banks
yangzhenye 5:fcad75e9b9e1 314
yangzhenye 0:ac2868313b41 315 for (int i = 0; i < 5 ; i++ ) {
yangzhenye 0:ac2868313b41 316 int pixel_x = x+i;
yangzhenye 0:ac2868313b41 317 if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83)
yangzhenye 0:ac2868313b41 318 break;
yangzhenye 0:ac2868313b41 319 buffer[pixel_x][y] = font5x7[(c - 32)*5 + i];
yangzhenye 0:ac2868313b41 320 // array is offset by 32 relative to ASCII, each character is 5 pixels wide
yangzhenye 0:ac2868313b41 321 }
yangzhenye 5:fcad75e9b9e1 322
yangzhenye 0:ac2868313b41 323 }
yangzhenye 0:ac2868313b41 324 }
yangzhenye 5:fcad75e9b9e1 325
yangzhenye 0:ac2868313b41 326 // function to print string at specified position
yangzhenye 0:ac2868313b41 327 void N5110::printString(const char *str,
yangzhenye 0:ac2868313b41 328 unsigned int const x,
yangzhenye 0:ac2868313b41 329 unsigned int const y)
yangzhenye 0:ac2868313b41 330 {
yangzhenye 0:ac2868313b41 331 if (y<BANKS) { // check if printing in range of y banks
yangzhenye 5:fcad75e9b9e1 332
yangzhenye 0:ac2868313b41 333 int n = 0 ; // counter for number of characters in string
yangzhenye 0:ac2868313b41 334 // loop through string and print character
yangzhenye 0:ac2868313b41 335 while(*str) {
yangzhenye 5:fcad75e9b9e1 336
yangzhenye 0:ac2868313b41 337 // writes the character bitmap data to the buffer, so that
yangzhenye 0:ac2868313b41 338 // text and pixels can be displayed at the same time
yangzhenye 0:ac2868313b41 339 for (int i = 0; i < 5 ; i++ ) {
yangzhenye 0:ac2868313b41 340 int pixel_x = x+i+n*6;
yangzhenye 0:ac2868313b41 341 if (pixel_x > WIDTH-1) // ensure pixel isn't outside the buffer size (0 - 83)
yangzhenye 0:ac2868313b41 342 break;
yangzhenye 0:ac2868313b41 343 buffer[pixel_x][y] = font5x7[(*str - 32)*5 + i];
yangzhenye 0:ac2868313b41 344 }
yangzhenye 0:ac2868313b41 345 str++; // go to next character in string
yangzhenye 0:ac2868313b41 346 n++; // increment index
yangzhenye 0:ac2868313b41 347 }
yangzhenye 0:ac2868313b41 348 }
yangzhenye 0:ac2868313b41 349 }
yangzhenye 5:fcad75e9b9e1 350
yangzhenye 0:ac2868313b41 351 // function to clear the screen buffer
yangzhenye 0:ac2868313b41 352 void N5110::clear()
yangzhenye 0:ac2868313b41 353 {
yangzhenye 0:ac2868313b41 354 memset(buffer,0,sizeof(buffer));
yangzhenye 0:ac2868313b41 355 }
yangzhenye 5:fcad75e9b9e1 356
yangzhenye 0:ac2868313b41 357 // function to plot array on display
yangzhenye 0:ac2868313b41 358 void N5110::plotArray(float const array[])
yangzhenye 0:ac2868313b41 359 {
yangzhenye 0:ac2868313b41 360 for (int i=0; i<WIDTH; i++) { // loop through array
yangzhenye 0:ac2868313b41 361 // elements are normalised from 0.0 to 1.0, so multiply
yangzhenye 0:ac2868313b41 362 // by 47 to convert to pixel range, and subtract from 47
yangzhenye 0:ac2868313b41 363 // since top-left is 0,0 in the display geometry
yangzhenye 5:fcad75e9b9e1 364 setPixel(i,47 - int(array[i]*47.0f),true);
yangzhenye 0:ac2868313b41 365 }
yangzhenye 5:fcad75e9b9e1 366
yangzhenye 0:ac2868313b41 367 }
yangzhenye 5:fcad75e9b9e1 368
yangzhenye 0:ac2868313b41 369 // function to draw circle
yangzhenye 0:ac2868313b41 370 void N5110:: drawCircle(unsigned int const x0,
yangzhenye 0:ac2868313b41 371 unsigned int const y0,
yangzhenye 0:ac2868313b41 372 unsigned int const radius,
yangzhenye 0:ac2868313b41 373 FillType const fill)
yangzhenye 0:ac2868313b41 374 {
yangzhenye 0:ac2868313b41 375 // from http://en.wikipedia.org/wiki/Midpoint_circle_algorithm
yangzhenye 0:ac2868313b41 376 int x = radius;
yangzhenye 0:ac2868313b41 377 int y = 0;
yangzhenye 0:ac2868313b41 378 int radiusError = 1-x;
yangzhenye 5:fcad75e9b9e1 379
yangzhenye 0:ac2868313b41 380 while(x >= y) {
yangzhenye 5:fcad75e9b9e1 381
yangzhenye 0:ac2868313b41 382 // if transparent, just draw outline
yangzhenye 0:ac2868313b41 383 if (fill == FILL_TRANSPARENT) {
yangzhenye 5:fcad75e9b9e1 384 setPixel( x + x0, y + y0,true);
yangzhenye 5:fcad75e9b9e1 385 setPixel(-x + x0, y + y0,true);
yangzhenye 5:fcad75e9b9e1 386 setPixel( y + x0, x + y0,true);
yangzhenye 5:fcad75e9b9e1 387 setPixel(-y + x0, x + y0,true);
yangzhenye 5:fcad75e9b9e1 388 setPixel(-y + x0, -x + y0,true);
yangzhenye 5:fcad75e9b9e1 389 setPixel( y + x0, -x + y0,true);
yangzhenye 5:fcad75e9b9e1 390 setPixel( x + x0, -y + y0,true);
yangzhenye 5:fcad75e9b9e1 391 setPixel(-x + x0, -y + y0,true);
yangzhenye 0:ac2868313b41 392 } else { // drawing filled circle, so draw lines between points at same y value
yangzhenye 5:fcad75e9b9e1 393
yangzhenye 0:ac2868313b41 394 int type = (fill==FILL_BLACK) ? 1:0; // black or white fill
yangzhenye 5:fcad75e9b9e1 395
yangzhenye 0:ac2868313b41 396 drawLine(x+x0,y+y0,-x+x0,y+y0,type);
yangzhenye 0:ac2868313b41 397 drawLine(y+x0,x+y0,-y+x0,x+y0,type);
yangzhenye 0:ac2868313b41 398 drawLine(y+x0,-x+y0,-y+x0,-x+y0,type);
yangzhenye 0:ac2868313b41 399 drawLine(x+x0,-y+y0,-x+x0,-y+y0,type);
yangzhenye 0:ac2868313b41 400 }
yangzhenye 5:fcad75e9b9e1 401
yangzhenye 0:ac2868313b41 402 y++;
yangzhenye 0:ac2868313b41 403 if (radiusError<0) {
yangzhenye 0:ac2868313b41 404 radiusError += 2 * y + 1;
yangzhenye 0:ac2868313b41 405 } else {
yangzhenye 0:ac2868313b41 406 x--;
yangzhenye 0:ac2868313b41 407 radiusError += 2 * (y - x) + 1;
yangzhenye 0:ac2868313b41 408 }
yangzhenye 0:ac2868313b41 409 }
yangzhenye 5:fcad75e9b9e1 410
yangzhenye 0:ac2868313b41 411 }
yangzhenye 5:fcad75e9b9e1 412
yangzhenye 0:ac2868313b41 413 void N5110::drawLine(unsigned int const x0,
yangzhenye 0:ac2868313b41 414 unsigned int const y0,
yangzhenye 0:ac2868313b41 415 unsigned int const x1,
yangzhenye 0:ac2868313b41 416 unsigned int const y1,
yangzhenye 0:ac2868313b41 417 unsigned int const type)
yangzhenye 0:ac2868313b41 418 {
yangzhenye 5:fcad75e9b9e1 419 // Note that the ranges can be negative so we have to turn the input values
yangzhenye 5:fcad75e9b9e1 420 // into signed integers first
yangzhenye 5:fcad75e9b9e1 421 int const y_range = static_cast<int>(y1) - static_cast<int>(y0);
yangzhenye 5:fcad75e9b9e1 422 int const x_range = static_cast<int>(x1) - static_cast<int>(x0);
yangzhenye 5:fcad75e9b9e1 423
yangzhenye 0:ac2868313b41 424 // if dotted line, set step to 2, else step is 1
yangzhenye 5:fcad75e9b9e1 425 unsigned int const step = (type==2) ? 2:1;
yangzhenye 5:fcad75e9b9e1 426
yangzhenye 0:ac2868313b41 427 // make sure we loop over the largest range to get the most pixels on the display
yangzhenye 0:ac2868313b41 428 // for instance, if drawing a vertical line (x_range = 0), we need to loop down the y pixels
yangzhenye 0:ac2868313b41 429 // or else we'll only end up with 1 pixel in the x column
yangzhenye 0:ac2868313b41 430 if ( abs(x_range) > abs(y_range) ) {
yangzhenye 5:fcad75e9b9e1 431
yangzhenye 0:ac2868313b41 432 // ensure we loop from smallest to largest or else for-loop won't run as expected
yangzhenye 5:fcad75e9b9e1 433 unsigned int const start = x_range > 0 ? x0:x1;
yangzhenye 5:fcad75e9b9e1 434 unsigned int const stop = x_range > 0 ? x1:x0;
yangzhenye 5:fcad75e9b9e1 435
yangzhenye 0:ac2868313b41 436 // loop between x pixels
yangzhenye 5:fcad75e9b9e1 437 for (unsigned int x = start; x<= stop ; x+=step) {
yangzhenye 0:ac2868313b41 438 // do linear interpolation
yangzhenye 5:fcad75e9b9e1 439 int const dx = static_cast<int>(x)-static_cast<int>(x0);
yangzhenye 5:fcad75e9b9e1 440 unsigned int const y = y0 + y_range * dx / x_range;
yangzhenye 5:fcad75e9b9e1 441
yangzhenye 5:fcad75e9b9e1 442 // If the line type is '0', this will clear the pixel
yangzhenye 5:fcad75e9b9e1 443 // If it is '1' or '2', the pixel will be set
yangzhenye 5:fcad75e9b9e1 444 setPixel(x,y, type);
yangzhenye 0:ac2868313b41 445 }
yangzhenye 0:ac2868313b41 446 } else {
yangzhenye 5:fcad75e9b9e1 447
yangzhenye 0:ac2868313b41 448 // ensure we loop from smallest to largest or else for-loop won't run as expected
yangzhenye 5:fcad75e9b9e1 449 unsigned int const start = y_range > 0 ? y0:y1;
yangzhenye 5:fcad75e9b9e1 450 unsigned int const stop = y_range > 0 ? y1:y0;
yangzhenye 5:fcad75e9b9e1 451
yangzhenye 5:fcad75e9b9e1 452 for (unsigned int y = start; y<= stop ; y+=step) {
yangzhenye 0:ac2868313b41 453 // do linear interpolation
yangzhenye 5:fcad75e9b9e1 454 int const dy = static_cast<int>(y)-static_cast<int>(y0);
yangzhenye 5:fcad75e9b9e1 455 unsigned int const x = x0 + x_range * dy / y_range;
yangzhenye 5:fcad75e9b9e1 456
yangzhenye 5:fcad75e9b9e1 457 // If the line type is '0', this will clear the pixel
yangzhenye 5:fcad75e9b9e1 458 // If it is '1' or '2', the pixel will be set
yangzhenye 5:fcad75e9b9e1 459 setPixel(x,y, type);
yangzhenye 0:ac2868313b41 460 }
yangzhenye 0:ac2868313b41 461 }
yangzhenye 5:fcad75e9b9e1 462
yangzhenye 0:ac2868313b41 463 }
yangzhenye 5:fcad75e9b9e1 464
yangzhenye 0:ac2868313b41 465 void N5110::drawRect(unsigned int const x0,
yangzhenye 0:ac2868313b41 466 unsigned int const y0,
yangzhenye 0:ac2868313b41 467 unsigned int const width,
yangzhenye 0:ac2868313b41 468 unsigned int const height,
yangzhenye 0:ac2868313b41 469 FillType const fill)
yangzhenye 0:ac2868313b41 470 {
yangzhenye 0:ac2868313b41 471 if (fill == FILL_TRANSPARENT) { // transparent, just outline
yangzhenye 0:ac2868313b41 472 drawLine(x0,y0,x0+(width-1),y0,1); // top
yangzhenye 0:ac2868313b41 473 drawLine(x0,y0+(height-1),x0+(width-1),y0+(height-1),1); // bottom
yangzhenye 0:ac2868313b41 474 drawLine(x0,y0,x0,y0+(height-1),1); // left
yangzhenye 0:ac2868313b41 475 drawLine(x0+(width-1),y0,x0+(width-1),y0+(height-1),1); // right
yangzhenye 0:ac2868313b41 476 } else { // filled rectangle
yangzhenye 0:ac2868313b41 477 int type = (fill==FILL_BLACK) ? 1:0; // black or white fill
yangzhenye 0:ac2868313b41 478 for (int y = y0; y<y0+height; y++) { // loop through rows of rectangle
yangzhenye 0:ac2868313b41 479 drawLine(x0,y,x0+(width-1),y,type); // draw line across screen
yangzhenye 0:ac2868313b41 480 }
yangzhenye 0:ac2868313b41 481 }
yangzhenye 5:fcad75e9b9e1 482 }
yangzhenye 5:fcad75e9b9e1 483
yangzhenye 5:fcad75e9b9e1 484 void N5110::drawSprite(int x0,
yangzhenye 5:fcad75e9b9e1 485 int y0,
yangzhenye 5:fcad75e9b9e1 486 int nrows,
yangzhenye 5:fcad75e9b9e1 487 int ncols,
yangzhenye 5:fcad75e9b9e1 488 int *sprite)
yangzhenye 5:fcad75e9b9e1 489 {
yangzhenye 5:fcad75e9b9e1 490 for (int i = 0; i < nrows; i++) {
yangzhenye 5:fcad75e9b9e1 491 for (int j = 0 ; j < ncols ; j++) {
yangzhenye 5:fcad75e9b9e1 492
yangzhenye 5:fcad75e9b9e1 493 int pixel = *((sprite+i*ncols)+j);
yangzhenye 5:fcad75e9b9e1 494 setPixel(x0+j,y0+i, pixel);
yangzhenye 5:fcad75e9b9e1 495 }
yangzhenye 5:fcad75e9b9e1 496 }
yangzhenye 0:ac2868313b41 497 }