LXR uboot/drivers/video/sed156x.c

   1/*
   2 * (C) Copyright 2003
   3 *
   4 * Pantelis Antoniou <panto@intracom.gr>
   5 * Intracom S.A.
   6 *
   7 * SPDX-License-Identifier:     GPL-2.0+
   8 */
   9
  10#include <common.h>
  11#include <watchdog.h>
  12
  13#include <sed156x.h>
  14
  15/* configure according to the selected display */
  16#if defined(CONFIG_SED156X_PG12864Q)
  17#define LCD_WIDTH       128
  18#define LCD_HEIGHT      64
  19#define LCD_LINES       64
  20#define LCD_PAGES       9
  21#define LCD_COLUMNS     132
  22#else
  23#error Unsupported SED156x configuration
  24#endif
  25
  26/* include the font data */
  27#include <video_font.h>
  28
  29#if VIDEO_FONT_WIDTH != 8 || VIDEO_FONT_HEIGHT != 16
  30#error Expecting VIDEO_FONT_WIDTH == 8 && VIDEO_FONT_HEIGHT == 16
  31#endif
  32
  33#define LCD_BYTE_WIDTH          (LCD_WIDTH / 8)
  34#define VIDEO_FONT_BYTE_WIDTH   (VIDEO_FONT_WIDTH / 8)
  35
  36#define LCD_TEXT_WIDTH  (LCD_WIDTH / VIDEO_FONT_WIDTH)
  37#define LCD_TEXT_HEIGHT (LCD_HEIGHT / VIDEO_FONT_HEIGHT)
  38
  39#define LCD_BYTE_LINESZ         (LCD_BYTE_WIDTH * VIDEO_FONT_HEIGHT)
  40
  41const int sed156x_text_width = LCD_TEXT_WIDTH;
  42const int sed156x_text_height = LCD_TEXT_HEIGHT;
  43
  44/**************************************************************************************/
  45
  46#define SED156X_SPI_RXD() (SED156X_SPI_RXD_PORT & SED156X_SPI_RXD_MASK)
  47
  48#define SED156X_SPI_TXD(x) \
  49        do { \
  50                if (x) \
  51                        SED156X_SPI_TXD_PORT |=  SED156X_SPI_TXD_MASK; \
  52                else \
  53                        SED156X_SPI_TXD_PORT &= ~SED156X_SPI_TXD_MASK; \
  54        } while(0)
  55
  56#define SED156X_SPI_CLK(x) \
  57        do { \
  58                if (x) \
  59                        SED156X_SPI_CLK_PORT |=  SED156X_SPI_CLK_MASK; \
  60                else \
  61                        SED156X_SPI_CLK_PORT &= ~SED156X_SPI_CLK_MASK; \
  62        } while(0)
  63
  64#define SED156X_SPI_CLK_TOGGLE() (SED156X_SPI_CLK_PORT ^= SED156X_SPI_CLK_MASK)
  65
  66#define SED156X_SPI_BIT_DELAY() /* no delay */
  67
  68#define SED156X_CS(x) \
  69        do { \
  70                if (x) \
  71                        SED156X_CS_PORT |=  SED156X_CS_MASK; \
  72                else \
  73                        SED156X_CS_PORT &= ~SED156X_CS_MASK; \
  74        } while(0)
  75
  76#define SED156X_A0(x) \
  77        do { \
  78                if (x) \
  79                        SED156X_A0_PORT |=  SED156X_A0_MASK; \
  80                else \
  81                        SED156X_A0_PORT &= ~SED156X_A0_MASK; \
  82        } while(0)
  83
  84/**************************************************************************************/
  85
  86/*** LCD Commands ***/
  87
  88#define LCD_ON          0xAF    /* Display ON                                         */
  89#define LCD_OFF         0xAE    /* Display OFF                                        */
  90#define LCD_LADDR       0x40    /* Display start line set + (6-bit) address           */
  91#define LCD_PADDR       0xB0    /* Page address set + (4-bit) page                    */
  92#define LCD_CADRH       0x10    /* Column address set upper + (4-bit) column hi       */
  93#define LCD_CADRL       0x00    /* Column address set lower + (4-bit) column lo       */
  94#define LCD_ADC_NRM     0xA0    /* ADC select Normal                                  */
  95#define LCD_ADC_REV     0xA1    /* ADC select Reverse                                 */
  96#define LCD_DSP_NRM     0xA6    /* LCD display Normal                                 */
  97#define LCD_DSP_REV     0xA7    /* LCD display Reverse                                */
  98#define LCD_DPT_NRM     0xA4    /* Display all points Normal                          */
  99#define LCD_DPT_ALL     0xA5    /* Display all points ON                              */
 100#define LCD_BIAS9       0xA2    /* LCD bias set 1/9                                   */
 101#define LCD_BIAS7       0xA3    /* LCD bias set 1/7                                   */
 102#define LCD_CAINC       0xE0    /* Read/modify/write                                  */
 103#define LCD_CAEND       0xEE    /* End                                                */
 104#define LCD_RESET       0xE2    /* Reset                                              */
 105#define LCD_C_NRM       0xC0    /* Common output mode select Normal direction         */
 106#define LCD_C_RVS       0xC8    /* Common output mode select Reverse direction        */
 107#define LCD_PWRMD       0x28    /* Power control set + (3-bit) mode                   */
 108#define LCD_RESRT       0x20    /* V5 v. reg. int. resistor ratio set + (3-bit) ratio */
 109#define LCD_EVSET       0x81    /* Electronic volume mode set + byte = (6-bit) volume */
 110#define LCD_SIOFF       0xAC    /* Static indicator OFF                               */
 111#define LCD_SION        0xAD    /* Static indicator ON + byte = (2-bit) mode          */
 112#define LCD_NOP         0xE3    /* NOP                                                */
 113#define LCD_TEST        0xF0    /* Test/Test mode reset (Note: *DO NOT USE*)          */
 114
 115/*-------------------------------------------------------------------------------
 116  Compound commands
 117  -------------------------------------------------------------------------------
 118  Command       Description                     Commands
 119  ----------    ------------------------        -------------------------------------
 120  POWS_ON       POWER SAVER ON command          LCD_OFF, LCD_D_ALL
 121  POWS_OFF      POWER SAVER OFF command         LCD_D_NRM
 122  SLEEPON       SLEEP mode                      LCD_SIOFF, POWS_ON
 123  SLEEPOFF      SLEEP mode cancel               LCD_D_NRM, LCD_SION, LCD_SIS_???
 124  STDBYON       STAND BY mode                   LCD_SION, POWS_ON
 125  STDBYOFF      STAND BY mode cancel            LCD_D_NRM
 126  -------------------------------------------------------------------------------*/
 127
 128/*** LCD various parameters ***/
 129#define LCD_PPB         8       /* Pixels per byte (display is B/W, 1 bit per pixel) */
 130
 131/*** LCD Status byte masks ***/
 132#define LCD_S_BUSY      0x80    /* Status Read - BUSY mask   */
 133#define LCD_S_ADC       0x40    /* Status Read - ADC mask    */
 134#define LCD_S_ONOFF     0x20    /* Status Read - ON/OFF mask */
 135#define LCD_S_RESET     0x10    /* Status Read - RESET mask  */
 136
 137/*** LCD commands parameter masks ***/
 138#define LCD_M_LADDR     0x3F    /* Display start line (6-bit) address mask           */
 139#define LCD_M_PADDR     0x0F    /* Page address (4-bit) page mask                    */
 140#define LCD_M_CADRH     0x0F    /* Column address upper (4-bit) column hi mask       */
 141#define LCD_M_CADRL     0x0F    /* Column address lower (4-bit) column lo mask       */
 142#define LCD_M_PWRMD     0x07    /* Power control (3-bit) mode mask                   */
 143#define LCD_M_RESRT     0x07    /* V5 v. reg. int. resistor ratio (3-bit) ratio mask */
 144#define LCD_M_EVSET     0x3F    /* Electronic volume mode byte (6-bit) volume mask   */
 145#define LCD_M_SION      0x03    /* Static indicator ON (2-bit) mode mask             */
 146
 147/*** LCD Power control cirquits control masks ***/
 148#define LCD_PWRBSTR     0x04    /* Power control mode - Booster cirquit ON           */
 149#define LCD_PWRVREG     0x02    /* Power control mode - Voltage regulator cirquit ON */
 150#define LCD_PWRVFOL     0x01    /* Power control mode - Voltage follower cirquit ON  */
 151
 152/*** LCD Static indicator states ***/
 153#define LCD_SIS_OFF     0x00    /* Static indicator register set - OFF state             */
 154#define LCD_SIS_BL      0x01    /* Static indicator register set - 1s blink state        */
 155#define LCD_SIS_RBL     0x02    /* Static indicator register set - .5s rapid blink state */
 156#define LCD_SIS_ON      0x03    /* Static indicator register set - constantly on state   */
 157
 158/*** LCD functions special parameters (commands) ***/
 159#define LCD_PREVP       0x80    /* Page number for moving to previous */
 160#define LCD_NEXTP       0x81    /* or next page */
 161#define LCD_ERR_P       0xFF    /* Error in page number */
 162
 163/*** LCD initialization settings ***/
 164#define LCD_BIAS        LCD_BIAS9       /* Bias: 1/9                  */
 165#define LCD_ADCMODE     LCD_ADC_NRM     /* ADC mode: normal           */
 166#define LCD_COMDIR      LCD_C_NRM       /* Common output mode: normal */
 167#define LCD_RRATIO      0               /* Resistor ratio: 0          */
 168#define LCD_CNTRST      0x1C            /* electronic volume: 1Ch     */
 169#define LCD_POWERM      (LCD_PWRBSTR | LCD_PWRVREG | LCD_PWRVFOL)       /* Power mode: All on */
 170
 171/**************************************************************************************/
 172
 173static inline unsigned int sed156x_transfer(unsigned int val)
 174{
 175        unsigned int rx;
 176        int b;
 177
 178        rx = 0; b = 8;
 179        while (--b >= 0) {
 180                SED156X_SPI_TXD(val & 0x80);
 181                val <<= 1;
 182                SED156X_SPI_CLK_TOGGLE();
 183                SED156X_SPI_BIT_DELAY();
 184                rx <<= 1;
 185                if (SED156X_SPI_RXD())
 186                        rx |= 1;
 187                SED156X_SPI_CLK_TOGGLE();
 188                SED156X_SPI_BIT_DELAY();
 189        }
 190
 191        return rx;
 192}
 193
 194unsigned int sed156x_data_transfer(unsigned int val)
 195{
 196        unsigned int rx;
 197
 198        SED156X_SPI_CLK(1);
 199        SED156X_CS(0);
 200        SED156X_A0(1);
 201
 202        rx = sed156x_transfer(val);
 203
 204        SED156X_CS(1);
 205
 206        return rx;
 207}
 208
 209void sed156x_data_block_transfer(const u8 *p, int size)
 210{
 211        SED156X_SPI_CLK(1);
 212        SED156X_CS(0);
 213        SED156X_A0(1);
 214
 215        while (--size >= 0)
 216                sed156x_transfer(*p++);
 217
 218        SED156X_CS(1);
 219}
 220
 221unsigned int sed156x_cmd_transfer(unsigned int val)
 222{
 223        unsigned int rx;
 224
 225        SED156X_SPI_CLK(1);
 226        SED156X_CS(0);
 227        SED156X_A0(0);
 228
 229        rx = sed156x_transfer(val);
 230
 231        SED156X_CS(1);
 232        SED156X_A0(1);
 233
 234        return rx;
 235}
 236
 237/******************************************************************************/
 238
 239static u8 hw_screen[LCD_PAGES][LCD_COLUMNS];
 240static u8 last_hw_screen[LCD_PAGES][LCD_COLUMNS];
 241static u8 sw_screen[LCD_BYTE_WIDTH * LCD_HEIGHT];
 242
 243void sed156x_sync(void)
 244{
 245        int i, j, last_page;
 246        u8 *d;
 247        const u8 *s, *e, *b, *r;
 248        u8 v0, v1, v2, v3, v4, v5, v6, v7;
 249
 250        /* copy and rotate sw_screen to hw_screen */
 251        for (i = 0; i < LCD_HEIGHT / 8; i++) {
 252
 253                d = &hw_screen[i][0];
 254                s = &sw_screen[LCD_BYTE_WIDTH * 8 * i + LCD_BYTE_WIDTH - 1];
 255
 256                for (j = 0; j < LCD_WIDTH / 8; j++) {
 257
 258                        v0 = s[0 * LCD_BYTE_WIDTH];
 259                        v1 = s[1 * LCD_BYTE_WIDTH];
 260                        v2 = s[2 * LCD_BYTE_WIDTH];
 261                        v3 = s[3 * LCD_BYTE_WIDTH];
 262                        v4 = s[4 * LCD_BYTE_WIDTH];
 263                        v5 = s[5 * LCD_BYTE_WIDTH];
 264                        v6 = s[6 * LCD_BYTE_WIDTH];
 265                        v7 = s[7 * LCD_BYTE_WIDTH];
 266
 267                        d[0] =  ((v7 & 0x01) << 7) |
 268                                ((v6 & 0x01) << 6) |
 269                                ((v5 & 0x01) << 5) |
 270                                ((v4 & 0x01) << 4) |
 271                                ((v3 & 0x01) << 3) |
 272                                ((v2 & 0x01) << 2) |
 273                                ((v1 & 0x01) << 1) |
 274                                 (v0 & 0x01)       ;
 275
 276                        d[1] =  ((v7 & 0x02) << 6) |
 277                                ((v6 & 0x02) << 5) |
 278                                ((v5 & 0x02) << 4) |
 279                                ((v4 & 0x02) << 3) |
 280                                ((v3 & 0x02) << 2) |
 281                                ((v2 & 0x02) << 1) |
 282                                ((v1 & 0x02) << 0) |
 283                                ((v0 & 0x02) >> 1) ;
 284
 285                        d[2] =  ((v7 & 0x04) << 5) |
 286                                ((v6 & 0x04) << 4) |
 287                                ((v5 & 0x04) << 3) |
 288                                ((v4 & 0x04) << 2) |
 289                                ((v3 & 0x04) << 1) |
 290                                 (v2 & 0x04)       |
 291                                ((v1 & 0x04) >> 1) |
 292                                ((v0 & 0x04) >> 2) ;
 293
 294                        d[3] =  ((v7 & 0x08) << 4) |
 295                                ((v6 & 0x08) << 3) |
 296                                ((v5 & 0x08) << 2) |
 297                                ((v4 & 0x08) << 1) |
 298                                 (v3 & 0x08)       |
 299                                ((v2 & 0x08) >> 1) |
 300                                ((v1 & 0x08) >> 2) |
 301                                ((v0 & 0x08) >> 3) ;
 302
 303                        d[4] =  ((v7 & 0x10) << 3) |
 304                                ((v6 & 0x10) << 2) |
 305                                ((v5 & 0x10) << 1) |
 306                                 (v4 & 0x10)       |
 307                                ((v3 & 0x10) >> 1) |
 308                                ((v2 & 0x10) >> 2) |
 309                                ((v1 & 0x10) >> 3) |
 310                                ((v0 & 0x10) >> 4) ;
 311
 312                        d[5] =  ((v7 & 0x20) << 2) |
 313                                ((v6 & 0x20) << 1) |
 314                                 (v5 & 0x20)       |
 315                                ((v4 & 0x20) >> 1) |
 316                                ((v3 & 0x20) >> 2) |
 317                                ((v2 & 0x20) >> 3) |
 318                                ((v1 & 0x20) >> 4) |
 319                                ((v0 & 0x20) >> 5) ;
 320
 321                        d[6] =  ((v7 & 0x40) << 1) |
 322                                 (v6 & 0x40)       |
 323                                ((v5 & 0x40) >> 1) |
 324                                ((v4 & 0x40) >> 2) |
 325                                ((v3 & 0x40) >> 3) |
 326                                ((v2 & 0x40) >> 4) |
 327                                ((v1 & 0x40) >> 5) |
 328                                ((v0 & 0x40) >> 6) ;
 329
 330                        d[7] =   (v7 & 0x80)       |
 331                                ((v6 & 0x80) >> 1) |
 332                                ((v5 & 0x80) >> 2) |
 333                                ((v4 & 0x80) >> 3) |
 334                                ((v3 & 0x80) >> 4) |
 335                                ((v2 & 0x80) >> 5) |
 336                                ((v1 & 0x80) >> 6) |
 337                                ((v0 & 0x80) >> 7) ;
 338
 339                        d += 8;
 340                        s--;
 341                }
 342        }
 343
 344        /* and now output only the differences */
 345        for (i = 0; i < LCD_PAGES; i++) {
 346
 347                b = &hw_screen[i][0];
 348                e = &hw_screen[i][LCD_COLUMNS];
 349
 350                d = &last_hw_screen[i][0];
 351                s = b;
 352
 353                last_page = -1;
 354
 355                /* update only the differences */
 356                do {
 357                        while (s < e && *s == *d) {
 358                                s++;
 359                                d++;
 360                        }
 361                        if (s == e)
 362                                break;
 363                        r = s;
 364                        while (s < e && *s != *d)
 365                                *d++ = *s++;
 366
 367                        j = r - b;
 368
 369                        if (i != last_page) {
 370                                sed156x_cmd_transfer(LCD_PADDR | i);
 371                                last_page = i;
 372                        }
 373
 374                        sed156x_cmd_transfer(LCD_CADRH | ((j >> 4) & 0x0F));
 375                        sed156x_cmd_transfer(LCD_CADRL | (j & 0x0F));
 376                        sed156x_data_block_transfer(r, s - r);
 377
 378                } while (s < e);
 379        }
 380
 381/********
 382        for (i = 0; i < LCD_PAGES; i++) {
 383                sed156x_cmd_transfer(LCD_PADDR | i);
 384                sed156x_cmd_transfer(LCD_CADRH | 0);
 385                sed156x_cmd_transfer(LCD_CADRL | 0);
 386                sed156x_data_block_transfer(&hw_screen[i][0], LCD_COLUMNS);
 387        }
 388        memcpy(last_hw_screen, hw_screen, sizeof(last_hw_screen));
 389********/
 390}
 391
 392void sed156x_clear(void)
 393{
 394        memset(sw_screen, 0, sizeof(sw_screen));
 395}
 396
 397void sed156x_output_at(int x, int y, const char *str, int size)
 398{
 399        int i, j;
 400        u8 *p;
 401        const u8 *s;
 402
 403        if ((unsigned int)y >= LCD_TEXT_HEIGHT || (unsigned int)x >= LCD_TEXT_WIDTH)
 404                return;
 405
 406        p = &sw_screen[y * VIDEO_FONT_HEIGHT * LCD_BYTE_WIDTH + x * VIDEO_FONT_BYTE_WIDTH];
 407
 408        while (--size >= 0) {
 409
 410                s = &video_fontdata[((int)*str++ & 0xff) * VIDEO_FONT_BYTE_WIDTH * VIDEO_FONT_HEIGHT];
 411                for (i = 0; i < VIDEO_FONT_HEIGHT; i++) {
 412                        for (j = 0; j < VIDEO_FONT_BYTE_WIDTH; j++)
 413                                *p++ = *s++;
 414                        p += LCD_BYTE_WIDTH - VIDEO_FONT_BYTE_WIDTH;
 415                }
 416                p -= (LCD_BYTE_LINESZ - VIDEO_FONT_BYTE_WIDTH);
 417
 418                if (x >= LCD_TEXT_WIDTH)
 419                        break;
 420                x++;
 421        }
 422}
 423
 424void sed156x_reverse_at(int x, int y, int size)
 425{
 426        int i, j;
 427        u8 *p;
 428
 429        if ((unsigned int)y >= LCD_TEXT_HEIGHT || (unsigned int)x >= LCD_TEXT_WIDTH)
 430                return;
 431
 432        p = &sw_screen[y * VIDEO_FONT_HEIGHT * LCD_BYTE_WIDTH + x * VIDEO_FONT_BYTE_WIDTH];
 433
 434        while (--size >= 0) {
 435
 436                for (i = 0; i < VIDEO_FONT_HEIGHT; i++) {
 437                        for (j = 0; j < VIDEO_FONT_BYTE_WIDTH; j++, p++)
 438                                *p = ~*p;
 439                        p += LCD_BYTE_WIDTH - VIDEO_FONT_BYTE_WIDTH;
 440                }
 441                p -= (LCD_BYTE_LINESZ - VIDEO_FONT_BYTE_WIDTH);
 442
 443                if (x >= LCD_TEXT_WIDTH)
 444                        break;
 445                x++;
 446        }
 447}
 448
 449void sed156x_scroll_line(void)
 450{
 451        memmove(&sw_screen[0],
 452                        &sw_screen[LCD_BYTE_LINESZ],
 453                        LCD_BYTE_WIDTH * (LCD_HEIGHT - VIDEO_FONT_HEIGHT));
 454}
 455
 456void sed156x_scroll(int dx, int dy)
 457{
 458        u8 *p1 = NULL, *p2 = NULL, *p3 = NULL;  /* pacify gcc */
 459        int adx, ady, i, sz;
 460
 461        adx = dx > 0 ? dx : -dx;
 462        ady = dy > 0 ? dy : -dy;
 463
 464        /* overscroll? erase everything */
 465        if (adx >= LCD_TEXT_WIDTH || ady >= LCD_TEXT_HEIGHT) {
 466                memset(sw_screen, 0, sizeof(sw_screen));
 467                return;
 468        }
 469
 470        sz = LCD_BYTE_LINESZ * ady;
 471        if (dy > 0) {
 472                p1 = &sw_screen[0];
 473                p2 = &sw_screen[sz];
 474                p3 = &sw_screen[LCD_BYTE_WIDTH * LCD_HEIGHT - sz];
 475        } else if (dy < 0) {
 476                p1 = &sw_screen[sz];
 477                p2 = &sw_screen[0];
 478                p3 = &sw_screen[0];
 479        }
 480
 481        if (ady > 0) {
 482                memmove(p1, p2, LCD_BYTE_WIDTH * LCD_HEIGHT - sz);
 483                memset(p3, 0, sz);
 484        }
 485
 486        sz = VIDEO_FONT_BYTE_WIDTH * adx;
 487        if (dx > 0) {
 488                p1 = &sw_screen[0];
 489                p2 = &sw_screen[0] + sz;
 490                p3 = &sw_screen[0] + LCD_BYTE_WIDTH - sz;
 491        } else if (dx < 0) {
 492                p1 = &sw_screen[0] + sz;
 493                p2 = &sw_screen[0];
 494                p3 = &sw_screen[0];
 495        }
 496
 497        /* xscroll */
 498        if (adx > 0) {
 499                for (i = 0; i < LCD_HEIGHT; i++) {
 500                        memmove(p1, p2, LCD_BYTE_WIDTH - sz);
 501                        memset(p3, 0, sz);
 502                        p1 += LCD_BYTE_WIDTH;
 503                        p2 += LCD_BYTE_WIDTH;
 504                        p3 += LCD_BYTE_WIDTH;
 505                }
 506        }
 507}
 508
 509void sed156x_init(void)
 510{
 511        int i;
 512
 513        SED156X_CS(1);
 514        SED156X_A0(1);
 515
 516        /* Send initialization commands to the LCD */
 517        sed156x_cmd_transfer(LCD_OFF);                  /* Turn display OFF       */
 518        sed156x_cmd_transfer(LCD_BIAS);                 /* set the LCD Bias,      */
 519        sed156x_cmd_transfer(LCD_ADCMODE);              /* ADC mode,              */
 520        sed156x_cmd_transfer(LCD_COMDIR);               /* common output mode,    */
 521        sed156x_cmd_transfer(LCD_RESRT | LCD_RRATIO);   /* resistor ratio,        */
 522        sed156x_cmd_transfer(LCD_EVSET);                /* electronic volume,     */
 523        sed156x_cmd_transfer(LCD_CNTRST);
 524        sed156x_cmd_transfer(LCD_PWRMD | LCD_POWERM);   /* and power mode         */
 525        sed156x_cmd_transfer(LCD_PADDR | 0);            /* cursor home            */
 526        sed156x_cmd_transfer(LCD_CADRH | 0);
 527        sed156x_cmd_transfer(LCD_CADRL | 0);
 528        sed156x_cmd_transfer(LCD_LADDR | 0);            /* and display start line */
 529        sed156x_cmd_transfer(LCD_DSP_NRM);              /* LCD display Normal     */
 530
 531        /* clear everything */
 532        memset(sw_screen, 0, sizeof(sw_screen));
 533        memset(hw_screen, 0, sizeof(hw_screen));
 534        memset(last_hw_screen, 0, sizeof(last_hw_screen));
 535
 536        for (i = 0; i < LCD_PAGES; i++) {
 537                sed156x_cmd_transfer(LCD_PADDR | i);
 538                sed156x_cmd_transfer(LCD_CADRH | 0);
 539                sed156x_cmd_transfer(LCD_CADRL | 0);
 540                sed156x_data_block_transfer(&hw_screen[i][0], LCD_COLUMNS);
 541        }
 542
 543        sed156x_clear();
 544        sed156x_sync();
 545        sed156x_cmd_transfer(LCD_ON);                   /* Turn display ON        */
 546}
 547