drivers/displays/tft/hw/st7735.c

   1 /**************************************************************************/
   2 /*!
   3     @file     st7735.c
   4     @author   K. Townsend (microBuilder.eu)
   5
   6     @section  DESCRIPTION
   7
   8     Driver for st7735 128x160 pixel TFT LCD displays.
   9
  10     This driver uses a bit-banged SPI interface and a 16-bit RGB565
  11     colour palette.
  12
  13     @section  LICENSE
  14
  15     Software License Agreement (BSD License)
  16
  17     Copyright (c) 2010, microBuilder SARL
  18     All rights reserved.
  19
  20     Redistribution and use in source and binary forms, with or without
  21     modification, are permitted provided that the following conditions are met:
  22     1. Redistributions of source code must retain the above copyright
  23     notice, this list of conditions and the following disclaimer.
  24     2. Redistributions in binary form must reproduce the above copyright
  25     notice, this list of conditions and the following disclaimer in the
  26     documentation and/or other materials provided with the distribution.
  27     3. Neither the name of the copyright holders nor the
  28     names of its contributors may be used to endorse or promote products
  29     derived from this software without specific prior written permission.
  30
  31     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
  32     EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  33     WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  34     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
  35     DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  36     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  37     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  38     ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  39     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  40     SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  41 */
  42 /**************************************************************************/
  43 #include "st7735.h"
  44 #include "core/systick/systick.h"
  45 #include "core/gpio/gpio.h"
  46
  47 static lcdOrientation_t lcdOrientation = LCD_ORIENTATION_PORTRAIT;
  48 static lcdProperties_t st7735Properties = { 128, 160, false, false, false, true, true };
  49
  50 /*************************************************/
  51 /* Private Methods                               */
  52 /*************************************************/
  53
  54 /*************************************************/
  55 void st7735WriteCmd(uint8_t command)
  56 {
  57   CLR_CS;
  58   CLR_RS;
  59   uint8_t i = 0;
  60   for (i=0; i<8; i++)
  61   {
  62     if (command & 0x80)
  63     {
  64       SET_SDA;
  65     }
  66     else
  67     {
  68       CLR_SDA;
  69     }
  70     CLR_SCL;
  71     command <<= 1;
  72     SET_SCL;
  73   }
  74   SET_CS;
  75 }
  76
  77 /*************************************************/
  78 void st7735WriteData(uint8_t data)
  79 {
  80   CLR_CS;
  81   SET_RS;
  82   uint8_t i = 0;
  83   for (i=0; i<8; i++)
  84   {
  85     if (data & 0x80)
  86     {
  87       SET_SDA;
  88     }
  89     else
  90     {
  91       CLR_SDA;
  92     }
  93     CLR_SCL;
  94     data <<= 1;
  95     SET_SCL;
  96   }
  97   SET_CS;
  98 }
  99
 100 /*************************************************/
 101 void st7735SetAddrWindow(uint8_t x0, uint8_t y0, uint8_t x1, uint8_t y1)
 102 {
 103   st7735WriteCmd(ST7735_CASET);   // column addr set
 104   st7735WriteData(0x00);
 105   st7735WriteData(x0+2);          // XSTART
 106   st7735WriteData(0x00);
 107   st7735WriteData(x1+2);          // XEND
 108
 109   st7735WriteCmd(ST7735_RASET);   // row addr set
 110   st7735WriteData(0x00);
 111   st7735WriteData(y0+1);          // YSTART
 112   st7735WriteData(0x00);
 113   st7735WriteData(y1+1);          // YEND
 114 }
 115
 116 /*************************************************/
 117 void st7735InitDisplay(void)
 118 {
 119   st7735WriteCmd(ST7735_SWRESET); // software reset
 120   systickDelay(50);
 121   st7735WriteCmd(ST7735_SLPOUT);  // out of sleep mode
 122   systickDelay(500);
 123
 124   st7735WriteCmd(ST7735_COLMOD);  // set color mode
 125   st7735WriteData(0x05);          // 16-bit color
 126   systickDelay(10);
 127
 128   st7735WriteCmd(ST7735_FRMCTR1); // frame rate control
 129   st7735WriteData(0x00);          // fastest refresh
 130   st7735WriteData(0x06);          // 6 lines front porch
 131   st7735WriteData(0x03);          // 3 lines backporch
 132   systickDelay(10);
 133
 134   st7735WriteCmd(ST7735_MADCTL);  // memory access control (directions)
 135   st7735WriteData(0xC8);          // row address/col address, bottom to top refresh
 136
 137   st7735WriteCmd(ST7735_DISSET5); // display settings #5
 138   st7735WriteData(0x15);          // 1 clock cycle nonoverlap, 2 cycle gate rise, 3 cycle oscil. equalize
 139   st7735WriteData(0x02);          // fix on VTL
 140
 141   st7735WriteCmd(ST7735_INVCTR);  // display inversion control
 142   st7735WriteData(0x0);           // line inversion
 143
 144   st7735WriteCmd(ST7735_PWCTR1);  // power control
 145   st7735WriteData(0x02);          // GVDD = 4.7V
 146   st7735WriteData(0x70);          // 1.0uA
 147   systickDelay(10);
 148   st7735WriteCmd(ST7735_PWCTR2);  // power control
 149   st7735WriteData(0x05);          // VGH = 14.7V, VGL = -7.35V
 150   st7735WriteCmd(ST7735_PWCTR3);  // power control
 151   st7735WriteData(0x01);          // Opamp current small
 152   st7735WriteData(0x02);          // Boost frequency
 153
 154
 155   st7735WriteCmd(ST7735_VMCTR1);  // power control
 156   st7735WriteData(0x3C);          // VCOMH = 4V
 157   st7735WriteData(0x38);          // VCOML = -1.1V
 158   systickDelay(10);
 159
 160   st7735WriteCmd(ST7735_PWCTR6);  // power control
 161   st7735WriteData(0x11);
 162   st7735WriteData(0x15);
 163
 164   st7735WriteCmd(ST7735_GMCTRP1);
 165   st7735WriteData(0x09);
 166   st7735WriteData(0x16);
 167   st7735WriteData(0x09);
 168   st7735WriteData(0x20);
 169   st7735WriteData(0x21);
 170   st7735WriteData(0x1B);
 171   st7735WriteData(0x13);
 172   st7735WriteData(0x19);
 173   st7735WriteData(0x17);
 174   st7735WriteData(0x15);
 175   st7735WriteData(0x1E);
 176   st7735WriteData(0x2B);
 177   st7735WriteData(0x04);
 178   st7735WriteData(0x05);
 179   st7735WriteData(0x02);
 180   st7735WriteData(0x0E);
 181   st7735WriteCmd(ST7735_GMCTRN1);
 182   st7735WriteData(0x0B);
 183   st7735WriteData(0x14);
 184   st7735WriteData(0x08);
 185   st7735WriteData(0x1E);
 186   st7735WriteData(0x22);
 187   st7735WriteData(0x1D);
 188   st7735WriteData(0x18);
 189   st7735WriteData(0x1E);
 190   st7735WriteData(0x1B);
 191   st7735WriteData(0x1A);
 192   st7735WriteData(0x24);
 193   st7735WriteData(0x2B);
 194   st7735WriteData(0x06);
 195   st7735WriteData(0x06);
 196   st7735WriteData(0x02);
 197   st7735WriteData(0x0F);
 198   systickDelay(10);
 199
 200   st7735WriteCmd(ST7735_CASET);   // column addr set
 201   st7735WriteData(0x00);
 202   st7735WriteData(0x02);          // XSTART = 2
 203   st7735WriteData(0x00);
 204   st7735WriteData(0x81);          // XEND = 129
 205
 206   st7735WriteCmd(ST7735_RASET);   // row addr set
 207   st7735WriteData(0x00);
 208   st7735WriteData(0x02);          // XSTART = 1
 209   st7735WriteData(0x00);
 210   st7735WriteData(0x81);          // XEND = 160
 211
 212   st7735WriteCmd(ST7735_NORON);   // normal display on
 213   systickDelay(10);
 214
 215   st7735WriteCmd(ST7735_DISPON);
 216   systickDelay(500);
 217 }
 218
 219 /*************************************************/
 220 /* Public Methods                                */
 221 /*************************************************/
 222
 223 /*************************************************/
 224 void lcdInit(void)
 225 {
 226   // Set control pins to output
 227   gpioSetDir(ST7735_PORT, ST7735_RS_PIN, 1);
 228   gpioSetDir(ST7735_PORT, ST7735_SDA_PIN, 1);
 229   gpioSetDir(ST7735_PORT, ST7735_SCL_PIN, 1);
 230   gpioSetDir(ST7735_PORT, ST7735_CS_PIN, 1);
 231   gpioSetDir(ST7735_PORT, ST7735_RES_PIN, 1);
 232   gpioSetDir(ST7735_PORT, ST7735_BL_PIN, 1);
 233
 234   // Set pins low by default (except reset)
 235   CLR_RS;
 236   CLR_SDA;
 237   CLR_SCL;
 238   CLR_CS;
 239   CLR_BL;
 240   SET_RES;
 241
 242   // Turn backlight on
 243   lcdBacklight(TRUE);
 244
 245   // Reset display
 246   SET_RES;
 247   systickDelay(50);
 248   CLR_RES;
 249   systickDelay(50);
 250   SET_RES;
 251   systickDelay(50);
 252
 253   // Run LCD init sequence
 254   st7735InitDisplay();
 255
 256   // Fill black
 257   lcdFillRGB(COLOR_BLACK);
 258 }
 259
 260 /*************************************************/
 261 void lcdBacklight(bool state)
 262 {
 263   // Set the backlight
 264   // Note: Depending on the type of transistor used
 265   // to control the backlight, you made need to invert
 266   // the values below
 267   if (state)
 268     // CLR_BL;
 269     SET_BL;
 270   else
 271     // SET_BL;
 272     CLR_BL;
 273 }
 274
 275 /*************************************************/
 276 void lcdTest(void)
 277 {
 278   uint8_t i = 0;
 279   for (i = 0; i < 100; i++)
 280   {
 281     lcdDrawPixel(i, i, 0xFFFF);
 282   }
 283 }
 284
 285 /*************************************************/
 286 void lcdFillRGB(uint16_t color)
 287 {
 288   uint8_t x, y;
 289   st7735SetAddrWindow(0, 0, lcdGetWidth() - 1, lcdGetHeight() - 1);
 290   st7735WriteCmd(ST7735_RAMWR);  // write to RAM
 291   for (x=0; x < lcdGetWidth(); x++)
 292   {
 293     for (y=0; y < lcdGetHeight(); y++)
 294     {
 295       st7735WriteData(color >> 8);
 296       st7735WriteData(color);
 297     }
 298   }
 299   st7735WriteCmd(ST7735_NOP);
 300 }
 301
 302 /*************************************************/
 303 void lcdDrawPixel(uint16_t x, uint16_t y, uint16_t color)
 304 {
 305   st7735SetAddrWindow(x,y,x+1,y+1);
 306   st7735WriteCmd(ST7735_RAMWR);  // write to RAM
 307   st7735WriteData(color >> 8);
 308   st7735WriteData(color);
 309 }
 310
 311 /**************************************************************************/
 312 /*!
 313     @brief  Draws an array of consecutive RGB565 pixels (much
 314             faster than addressing each pixel individually)
 315 */
 316 /**************************************************************************/
 317 void lcdDrawPixels(uint16_t x, uint16_t y, uint16_t *data, uint32_t len)
 318 {
 319   // ToDo: Optimise this function ... currently only a placeholder
 320   uint32_t i = 0;
 321   do
 322   {
 323     lcdDrawPixel(x+i, y, data[i]);
 324     i++;
 325   } while (i<len);
 326 }
 327
 328 /*************************************************/
 329 void lcdDrawHLine(uint16_t x0, uint16_t x1, uint16_t y, uint16_t color)
 330 {
 331   // Allows for slightly better performance than setting individual pixels
 332   uint16_t x, pixels;
 333
 334   if (x1 < x0)
 335   {
 336     // Switch x1 and x0
 337     x = x1;
 338     x1 = x0;
 339     x0 = x;
 340   }
 341
 342   // Check limits
 343   if (x1 >= lcdGetWidth())
 344   {
 345     x1 = lcdGetWidth() - 1;
 346   }
 347   if (x0 >= lcdGetWidth())
 348   {
 349     x0 = lcdGetWidth() - 1;
 350   }
 351
 352   st7735SetAddrWindow(x0, y, lcdGetWidth(), y + 1);
 353   st7735WriteCmd(ST7735_RAMWR);  // write to RAM
 354   for (pixels = 0; pixels < x1 - x0 + 1; pixels++)
 355   {
 356     st7735WriteData(color >> 8);
 357     st7735WriteData(color);
 358   }
 359   st7735WriteCmd(ST7735_NOP);
 360 }
 361
 362 /*************************************************/
 363 void lcdDrawVLine(uint16_t x, uint16_t y0, uint16_t y1, uint16_t color)
 364 {
 365   // Allows for slightly better performance than setting individual pixels
 366   uint16_t y, pixels;
 367
 368   if (y1 < y0)
 369   {
 370     // Switch y1 and y0
 371     y = y1;
 372     y1 = y0;
 373     y0 = y;
 374   }
 375
 376   // Check limits
 377   if (y1 >= lcdGetHeight())
 378   {
 379     y1 = lcdGetHeight() - 1;
 380   }
 381   if (y0 >= lcdGetHeight())
 382   {
 383     y0 = lcdGetHeight() - 1;
 384   }
 385
 386   st7735SetAddrWindow(x, y0, x, lcdGetHeight());
 387   st7735WriteCmd(ST7735_RAMWR);  // write to RAM
 388   for (pixels = 0; pixels < y1 - y0 + 1; pixels++)
 389   {
 390     st7735WriteData(color >> 8);
 391     st7735WriteData(color);
 392   }
 393   st7735WriteCmd(ST7735_NOP);
 394 }
 395
 396 /*************************************************/
 397 uint16_t lcdGetPixel(uint16_t x, uint16_t y)
 398 {
 399   // ToDo
 400   return 0;
 401 }
 402
 403 /*************************************************/
 404 void lcdSetOrientation(lcdOrientation_t orientation)
 405 {
 406   // ToDo
 407 }
 408
 409 /*************************************************/
 410 lcdOrientation_t lcdGetOrientation(void)
 411 {
 412   return lcdOrientation;
 413 }
 414
 415 /*************************************************/
 416 uint16_t lcdGetWidth(void)
 417 {
 418   return st7735Properties.width;
 419 }
 420
 421 /*************************************************/
 422 uint16_t lcdGetHeight(void)
 423 {
 424   return st7735Properties.height;
 425 }
 426
 427 /*************************************************/
 428 void lcdScroll(int16_t pixels, uint16_t fillColor)
 429 {
 430   // ToDo
 431 }
 432
 433 /*************************************************/
 434 uint16_t lcdGetControllerID(void)
 435 {
 436   return 0x7735;
 437 }
 438
 439 /*************************************************/
 440 lcdProperties_t lcdGetProperties(void)
 441 {
 442   return st7735Properties;
 443 }