drivers/lcd/tft/hw/st7783.c

   1 /**************************************************************************/
   2 /*!
   3     @file     st7783.c
   4     @author   K. Townsend (microBuilder.eu)
   5
   6     @section  DESCRIPTION
   7
   8     Driver for st7783 240x320 pixel TFT LCD displays.
   9
  10     This driver uses an 8-bit interface and a 16-bit RGB565 colour palette.
  11
  12     @section  UPDATES
  13
  14     26-11-2010: st7783ReadData contributed by Adafruit Industries
  15
  16     @section  LICENSE
  17
  18     Software License Agreement (BSD License)
  19
  20     Copyright (c) 2010, microBuilder SARL
  21     All rights reserved.
  22
  23     Redistribution and use in source and binary forms, with or without
  24     modification, are permitted provided that the following conditions are met:
  25     1. Redistributions of source code must retain the above copyright
  26     notice, this list of conditions and the following disclaimer.
  27     2. Redistributions in binary form must reproduce the above copyright
  28     notice, this list of conditions and the following disclaimer in the
  29     documentation and/or other materials provided with the distribution.
  30     3. Neither the name of the copyright holders nor the
  31     names of its contributors may be used to endorse or promote products
  32     derived from this software without specific prior written permission.
  33
  34     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
  35     EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  36     WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  37     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
  38     DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  39     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  40     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  41     ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  42     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  43     SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  44 */
  45 /**************************************************************************/
  46 #include "st7783.h"
  47 #include "core/systick/systick.h"
  48 #include "drivers/lcd/tft/touchscreen.h"
  49
  50 static lcdOrientation_t lcdOrientation = LCD_ORIENTATION_PORTRAIT;
  51 static lcdProperties_t st7783Properties = { 240, 320, TRUE, TRUE, FALSE };
  52
  53 /*************************************************/
  54 /* Private Methods                               */
  55 /*************************************************/
  56
  57 /*************************************************/
  58 void st7783Delay(unsigned int t)
  59 {
  60   unsigned char t1;
  61   while(t--)
  62   for ( t1=10; t1 > 0; t1-- )
  63   {
  64     __asm("nop");
  65   }
  66 }
  67
  68 /*************************************************/
  69 void st7783WriteCmd(uint16_t command)
  70 {
  71   // Compiled with -Os on GCC 4.4 this works out to 25 cycles
  72   // (versus 36 compiled with no optimisations).  I'm not sure it
  73   // can be improved further, so that means 25 cycles/350nS for
  74   // continuous writes (cmd, data, data, data, ...) or ~150 cycles/
  75   // ~2.1uS for a random pixel (Set X [cmd+data], Set Y [cmd+data],
  76   // Set color [cmd+data]) (times assumes 72MHz clock).
  77
  78   CLR_CS_CD_SET_RD_WR;  // Saves 18 commands compared to "CLR_CS; CLR_CD; SET_RD; SET_WR;"
  79   ST7783_GPIO2DATA_DATA = (command >> (8 - ST7783_DATA_OFFSET));
  80   CLR_WR;
  81   SET_WR;
  82   ST7783_GPIO2DATA_DATA = command << ST7783_DATA_OFFSET;
  83   CLR_WR;
  84   SET_WR_CS;            // Saves 7 commands compared to "SET_WR; SET_CS;"
  85 }
  86
  87 /*************************************************/
  88 void st7783WriteData(uint16_t data)
  89 {
  90   CLR_CS_SET_CD_RD_WR;  // Saves 18 commands compared to SET_CD; SET_RD; SET_WR; CLR_CS"
  91   ST7783_GPIO2DATA_DATA = (data >> (8 - ST7783_DATA_OFFSET));
  92   CLR_WR;
  93   SET_WR;
  94   ST7783_GPIO2DATA_DATA = data << ST7783_DATA_OFFSET;
  95   CLR_WR;
  96   SET_WR_CS;            // Saves 7 commands compared to "SET_WR, SET_CS;"
  97 }
  98
  99 /*************************************************/
 100 uint16_t st7783ReadData(void)
 101 {
 102   // ToDo: Optimise this method!
 103
 104   uint16_t high, low;
 105   high = low = 0;
 106   uint16_t d;
 107
 108   SET_CD_RD_WR;   // Saves 14 commands compared to "SET_CD; SET_RD; SET_WR"
 109   CLR_CS;
 110
 111   // set inputs
 112   ST7783_GPIO2DATA_SETINPUT;
 113   CLR_RD;
 114   st7783Delay(100);
 115   high = ST7783_GPIO2DATA_DATA;
 116   high >>= ST7783_DATA_OFFSET;
 117   high &= 0xFF;
 118   SET_RD;
 119
 120   CLR_RD;
 121   st7783Delay(100);
 122   low = ST7783_GPIO2DATA_DATA;
 123   low >>= ST7783_DATA_OFFSET;
 124   low &=0xFF;
 125   SET_RD;
 126
 127   SET_CS;
 128   ST7783_GPIO2DATA_SETOUTPUT;
 129
 130   d = high;
 131   d <<= 8;
 132   d |= low;
 133
 134   return d;
 135 }
 136
 137 /*************************************************/
 138 uint16_t st7783Read(uint16_t addr)
 139 {
 140   st7783WriteCmd(addr);
 141   return st7783ReadData();
 142 }
 143
 144 /*************************************************/
 145 void st7783Command(uint16_t command, uint16_t data)
 146 {
 147   st7783WriteCmd(command);
 148   st7783WriteData(data);
 149 }
 150
 151 /*************************************************/
 152 /* Returns the 4-hexdigit controller code        */
 153 /*************************************************/
 154 uint16_t st7783Type(void)
 155 {
 156   st7783WriteCmd(0x0);
 157   return st7783ReadData();
 158 }
 159
 160 /*************************************************/
 161 void st7783SetCursor(uint16_t x, uint16_t y)
 162 {
 163   uint16_t he, ve, al, ah;
 164
 165   switch (lcdOrientation)
 166   {
 167   case LCD_ORIENTATION_LANDSCAPE:
 168           he = st7783Properties.width-1-y;
 169           ve = st7783Properties.height-1-x;
 170           al = y;
 171           ah = x;
 172           break;
 173   case LCD_ORIENTATION_PORTRAIT:
 174   default:
 175           he = st7783Properties.width-1;
 176           ve = st7783Properties.height-1;
 177           al = x;
 178           ah = y;
 179           break;
 180   }
 181   st7783Command(0x0051, he);
 182   st7783Command(0x0053, ve);
 183   st7783Command(0x0020, al);
 184   st7783Command(0x0021, ah);
 185 }
 186
 187 /*************************************************/
 188 void st7783InitDisplay(void)
 189 {
 190   // Clear data line
 191   GPIO_GPIO2DATA &= ~ST7783_DATA_MASK;
 192
 193   SET_RD;
 194   SET_WR;
 195   SET_CS;
 196   SET_CD;
 197
 198   // Reset display
 199   CLR_RESET;
 200   st7783Delay(10000);
 201   SET_RESET;
 202   st7783Delay(500);
 203
 204   st7783Command(0x00FF, 0x0001);
 205   st7783Command(0x00F3, 0x0008);
 206   st7783WriteCmd(0x00F3);
 207
 208   st7783Command(0x0001, 0x0100);     // Driver Output Control Register (R01h)
 209   st7783Command(0x0002, 0x0700);     // LCD Driving Waveform Control (R02h)
 210   st7783Command(0x0003, 0x1030);     // Entry Mode (R03h)
 211   st7783Command(0x0008, 0x0302);
 212   st7783Command(0x0009, 0x0000);
 213   st7783Command(0x0010, 0x0000);     // Power Control 1 (R10h)
 214   st7783Command(0x0011, 0x0007);     // Power Control 2 (R11h)
 215   st7783Command(0x0012, 0x0000);     // Power Control 3 (R12h)
 216   st7783Command(0x0013, 0x0000);     // Power Control 4 (R13h)
 217   st7783Delay(1000);
 218   st7783Command(0x0010, 0x14B0);     // Power Control 1 (R10h)
 219   st7783Delay(500);
 220   st7783Command(0x0011, 0x0007);     // Power Control 2 (R11h)
 221   st7783Delay(500);
 222   st7783Command(0x0012, 0x008E);     // Power Control 3 (R12h)
 223   st7783Command(0x0013, 0x0C00);     // Power Control 4 (R13h)
 224   st7783Command(0x0029, 0x0015);     // NVM read data 2 (R29h)
 225   st7783Delay(500);
 226   st7783Command(0x0030, 0x0000);     // Gamma Control 1
 227   st7783Command(0x0031, 0x0107);     // Gamma Control 2
 228   st7783Command(0x0032, 0x0000);     // Gamma Control 3
 229   st7783Command(0x0035, 0x0203);     // Gamma Control 6
 230   st7783Command(0x0036, 0x0402);     // Gamma Control 7
 231   st7783Command(0x0037, 0x0000);     // Gamma Control 8
 232   st7783Command(0x0038, 0x0207);     // Gamma Control 9
 233   st7783Command(0x0039, 0x0000);     // Gamma Control 10
 234   st7783Command(0x003C, 0x0203);     // Gamma Control 13
 235   st7783Command(0x003D, 0x0403);     // Gamma Control 14
 236   st7783Command(0x0050, 0x0000);     // Window Horizontal RAM Address Start (R50h)
 237   st7783Command(0x0051, st7783Properties.width - 1);    // Window Horizontal RAM Address End (R51h)
 238   st7783Command(0x0052, 0X0000);     // Window Vertical RAM Address Start (R52h)
 239   st7783Command(0x0053, st7783Properties.height - 1);    // Window Vertical RAM Address End (R53h)
 240   st7783Command(0x0060, 0xa700);     // Driver Output Control (R60h)
 241   st7783Command(0x0061, 0x0001);     // Driver Output Control (R61h)
 242   st7783Command(0x0090, 0X0029);     // Panel Interface Control 1 (R90h)
 243
 244   // Display On
 245   st7783Command(0x0007, 0x0133);     // Display Control (R07h)
 246   st7783Delay(500);
 247   st7783WriteCmd(0x0022);
 248 }
 249
 250 /*************************************************/
 251 void st7783Home(void)
 252 {
 253   st7783SetCursor(0, 0);
 254   st7783WriteCmd(0x0022);            // Write Data to GRAM (R22h)
 255 }
 256
 257 /*************************************************/
 258 void st7783SetWindow(uint16_t x, uint16_t y, uint16_t height, uint16_t width)
 259 {
 260   // Window horizontal RAM address start
 261   if (x >= height) st7783Command(0x50, (x - height + 1));
 262   else st7783Command(0x50, 0);
 263   // Window horizontal GRAM address end
 264   st7783Command(0x51, x);
 265   // Window vertical GRAM address start
 266   if (y >= width) st7783Command(0x52, (y - width + 1));
 267   else st7783Command(0x52, 0);
 268   // Window vertical GRAM address end
 269   st7783Command(0x53, y);
 270
 271   st7783SetCursor(x, y);
 272 }
 273
 274 /*************************************************/
 275 /* Public Methods                                */
 276 /*************************************************/
 277
 278 /*************************************************/
 279 void lcdInit(void)
 280 {
 281   // Set control line pins to output
 282   gpioSetDir(ST7783_CS_PORT, ST7783_CS_PIN, 1);
 283   gpioSetDir(ST7783_CD_PORT, ST7783_CD_PIN, 1);
 284   gpioSetDir(ST7783_WR_PORT, ST7783_WR_PIN, 1);
 285   gpioSetDir(ST7783_RD_PORT, ST7783_RD_PIN, 1);
 286
 287   // Set data port pins to output
 288   ST7783_GPIO2DATA_SETOUTPUT;
 289
 290   // Disable pullups
 291   ST7783_DISABLEPULLUPS();
 292
 293   // Set backlight pin to output and turn it on
 294   gpioSetDir(ST7783_BL_PORT, ST7783_BL_PIN, 1);      // set to output
 295   lcdBacklight(TRUE);
 296
 297   // Set reset pin to output
 298   gpioSetDir(ST7783_RES_PORT, ST7783_RES_PIN, 1);    // Set to output
 299   gpioSetValue(ST7783_RES_PORT, ST7783_RES_PIN, 0);  // Low to reset
 300   systickDelay(50);
 301   gpioSetValue(ST7783_RES_PORT, ST7783_RES_PIN, 1);  // High to exit
 302
 303   // Initialize the display
 304   st7783InitDisplay();
 305
 306   // Set lcd to default orientation
 307   lcdSetOrientation(lcdOrientation);
 308
 309   // Fill black
 310   lcdFillRGB(COLOR_BLACK);
 311
 312   // Initialise the touch screen (and calibrate if necessary)
 313   tsInit();
 314 }
 315
 316 /*************************************************/
 317 void lcdBacklight(bool state)
 318 {
 319   // Set the backlight
 320   gpioSetValue(ST7783_BL_PORT, ST7783_BL_PIN, state ? 0 : 1);
 321 }
 322
 323 /*************************************************/
 324 void lcdTest(void)
 325 {
 326   uint32_t i,j;
 327   st7783Home();
 328
 329   for(i=0;i<320;i++)
 330   {
 331     for(j=0;j<240;j++)
 332     {
 333       if(i>279)st7783WriteData(COLOR_WHITE);
 334       else if(i>239)st7783WriteData(COLOR_BLUE);
 335       else if(i>199)st7783WriteData(COLOR_GREEN);
 336       else if(i>159)st7783WriteData(COLOR_CYAN);
 337       else if(i>119)st7783WriteData(COLOR_RED);
 338       else if(i>79)st7783WriteData(COLOR_MAGENTA);
 339       else if(i>39)st7783WriteData(COLOR_YELLOW);
 340       else st7783WriteData(COLOR_BLACK);
 341     }
 342   }
 343 }
 344
 345 /*************************************************/
 346 void lcdFillRGB(uint16_t data)
 347 {
 348   unsigned int i;
 349   st7783Home();
 350
 351   uint32_t pixels = 320*240;
 352   for ( i=0; i < pixels; i++ )
 353   {
 354     st7783WriteData(data);
 355   }
 356 }
 357
 358 /*************************************************/
 359 void lcdDrawPixel(uint16_t x, uint16_t y, uint16_t color)
 360 {
 361   st7783SetCursor(x, y);
 362   st7783WriteCmd(0x0022);  // Write Data to GRAM (R22h)
 363   st7783WriteData(color);
 364 }
 365
 366 /**************************************************************************/
 367 /*!
 368     @brief  Draws an array of consecutive RGB565 pixels (much
 369             faster than addressing each pixel individually)
 370 */
 371 /**************************************************************************/
 372 void lcdDrawPixels(uint16_t x, uint16_t y, uint16_t *data, uint32_t len)
 373 {
 374   uint32_t i = 0;
 375   st7783SetCursor(x, y);
 376   st7783WriteCmd(0x0022);  // Write Data to GRAM (R22h)
 377   do
 378   {
 379     st7783WriteData(data[i]);
 380     i++;
 381   } while (i<len);
 382 }
 383
 384 /*************************************************/
 385 void lcdDrawHLine(uint16_t x0, uint16_t x1, uint16_t y, uint16_t color)
 386 {
 387   // Allows for slightly better performance than setting individual pixels
 388   uint16_t x, pixels;
 389
 390   if (x1 < x0)
 391   {
 392     // Switch x1 and x0
 393     x = x1;
 394     x1 = x0;
 395     x0 = x;
 396   }
 397   st7783SetCursor(x0, y);
 398   st7783WriteCmd(0x0022);  // Write Data to GRAM (R22h)
 399   for (pixels = 0; pixels < x1 - x0 + 1; pixels++)
 400   {
 401     st7783WriteData(color);
 402   }
 403 }
 404
 405 /*************************************************/
 406 void lcdDrawVLine(uint16_t x, uint16_t y0, uint16_t y1, uint16_t color)
 407 {
 408   // Allows for slightly better performance than setting individual pixels
 409   lcdOrientation_t orientation = lcdOrientation;
 410
 411   // Switch orientation
 412   lcdSetOrientation(orientation == LCD_ORIENTATION_PORTRAIT ? LCD_ORIENTATION_LANDSCAPE : LCD_ORIENTATION_PORTRAIT);
 413
 414   // Draw horizontal line like usual
 415   lcdDrawHLine(y0, y1, lcdGetHeight() - x, color);
 416
 417   // Switch orientation back
 418   lcdSetOrientation(orientation);
 419 }
 420
 421 /*************************************************/
 422 uint16_t lcdGetPixel(uint16_t x, uint16_t y)
 423 {
 424   uint16_t preFetch = 0;
 425
 426   st7783SetCursor(x, y);
 427   st7783WriteCmd(0x0022);
 428   preFetch = st7783ReadData();
 429
 430   // Eeek ... why does this need to be done twice for a proper value?!?
 431   st7783SetCursor(x, y);
 432   st7783WriteCmd(0x0022);
 433   return st7783ReadData();
 434 }
 435
 436 /*************************************************/
 437 void lcdSetOrientation(lcdOrientation_t orientation)
 438 {
 439   uint16_t entryMode = 0x1030;
 440
 441   switch (orientation)
 442   {
 443     case LCD_ORIENTATION_PORTRAIT:
 444       entryMode = 0x1030;
 445       break;
 446     case LCD_ORIENTATION_LANDSCAPE:
 447       entryMode = 0x1028;
 448       break;
 449   }
 450   st7783WriteCmd(0x0003);
 451   st7783WriteData(entryMode);
 452   lcdOrientation = orientation;
 453   st7783SetCursor(0, 0);
 454 }
 455
 456 /*************************************************/
 457 lcdOrientation_t lcdGetOrientation(void)
 458 {
 459   return lcdOrientation;
 460 }
 461
 462 /*************************************************/
 463 uint16_t lcdGetWidth(void)
 464 {
 465   switch (lcdOrientation)
 466   {
 467     case LCD_ORIENTATION_PORTRAIT:
 468       return st7783Properties.width;
 469       break;
 470     case LCD_ORIENTATION_LANDSCAPE:
 471     default:
 472       return st7783Properties.height;
 473   }
 474 }
 475
 476 /*************************************************/
 477 uint16_t lcdGetHeight(void)
 478 {
 479   switch (lcdOrientation)
 480   {
 481     case LCD_ORIENTATION_PORTRAIT:
 482       return st7783Properties.height;
 483       break;
 484     case LCD_ORIENTATION_LANDSCAPE:
 485     default:
 486       return st7783Properties.width;
 487   }
 488 }
 489
 490 /*************************************************/
 491 void lcdScroll(int16_t pixels, uint16_t fillColor)
 492 {
 493   // Not implemented in ST7783
 494 }
 495
 496 /*************************************************/
 497 uint16_t lcdGetControllerID(void)
 498 {
 499   return st7783Type();
 500 }
 501
 502 /*************************************************/
 503 lcdProperties_t lcdGetProperties(void)
 504 {
 505     return st7783Properties;
 506 }