LXR uboot/drivers/video/sed156x.c

   1/*
   2 * (C) Copyright 2003
   3 *
   4 * Pantelis Antoniou <panto@intracom.gr>
   5 * Intracom S.A.
   6 *
   7 * See file CREDITS for list of people who contributed to this
   8 * project.
   9 *
  10 * This program is free software; you can redistribute it and/or
  11 * modify it under the terms of the GNU General Public License as
  12 * published by the Free Software Foundation; either version 2 of
  13 * the License, or (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, write to the Free Software
  22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23 * MA 02111-1307 USA
  24 */
  25
  26#include <common.h>
  27#include <watchdog.h>
  28
  29#include <sed156x.h>
  30
  31/* configure according to the selected display */
  32#if defined(CONFIG_SED156X_PG12864Q)
  33#define LCD_WIDTH       128
  34#define LCD_HEIGHT      64
  35#define LCD_LINES       64
  36#define LCD_PAGES       9
  37#define LCD_COLUMNS     132
  38#else
  39#error Unsupported SED156x configuration
  40#endif
  41
  42/* include the font data */
  43#include <video_font.h>
  44
  45#if VIDEO_FONT_WIDTH != 8 || VIDEO_FONT_HEIGHT != 16
  46#error Expecting VIDEO_FONT_WIDTH == 8 && VIDEO_FONT_HEIGHT == 16
  47#endif
  48
  49#define LCD_BYTE_WIDTH          (LCD_WIDTH / 8)
  50#define VIDEO_FONT_BYTE_WIDTH   (VIDEO_FONT_WIDTH / 8)
  51
  52#define LCD_TEXT_WIDTH  (LCD_WIDTH / VIDEO_FONT_WIDTH)
  53#define LCD_TEXT_HEIGHT (LCD_HEIGHT / VIDEO_FONT_HEIGHT)
  54
  55#define LCD_BYTE_LINESZ         (LCD_BYTE_WIDTH * VIDEO_FONT_HEIGHT)
  56
  57const int sed156x_text_width = LCD_TEXT_WIDTH;
  58const int sed156x_text_height = LCD_TEXT_HEIGHT;
  59
  60/**************************************************************************************/
  61
  62#define SED156X_SPI_RXD() (SED156X_SPI_RXD_PORT & SED156X_SPI_RXD_MASK)
  63
  64#define SED156X_SPI_TXD(x) \
  65        do { \
  66                if (x) \
  67                        SED156X_SPI_TXD_PORT |=  SED156X_SPI_TXD_MASK; \
  68                else \
  69                        SED156X_SPI_TXD_PORT &= ~SED156X_SPI_TXD_MASK; \
  70        } while(0)
  71
  72#define SED156X_SPI_CLK(x) \
  73        do { \
  74                if (x) \
  75                        SED156X_SPI_CLK_PORT |=  SED156X_SPI_CLK_MASK; \
  76                else \
  77                        SED156X_SPI_CLK_PORT &= ~SED156X_SPI_CLK_MASK; \
  78        } while(0)
  79
  80#define SED156X_SPI_CLK_TOGGLE() (SED156X_SPI_CLK_PORT ^= SED156X_SPI_CLK_MASK)
  81
  82#define SED156X_SPI_BIT_DELAY() /* no delay */
  83
  84#define SED156X_CS(x) \
  85        do { \
  86                if (x) \
  87                        SED156X_CS_PORT |=  SED156X_CS_MASK; \
  88                else \
  89                        SED156X_CS_PORT &= ~SED156X_CS_MASK; \
  90        } while(0)
  91
  92#define SED156X_A0(x) \
  93        do { \
  94                if (x) \
  95                        SED156X_A0_PORT |=  SED156X_A0_MASK; \
  96                else \
  97                        SED156X_A0_PORT &= ~SED156X_A0_MASK; \
  98        } while(0)
  99
 100/**************************************************************************************/
 101
 102/*** LCD Commands ***/
 103
 104#define LCD_ON          0xAF    /* Display ON                                         */
 105#define LCD_OFF         0xAE    /* Display OFF                                        */
 106#define LCD_LADDR       0x40    /* Display start line set + (6-bit) address           */
 107#define LCD_PADDR       0xB0    /* Page address set + (4-bit) page                    */
 108#define LCD_CADRH       0x10    /* Column address set upper + (4-bit) column hi       */
 109#define LCD_CADRL       0x00    /* Column address set lower + (4-bit) column lo       */
 110#define LCD_ADC_NRM     0xA0    /* ADC select Normal                                  */
 111#define LCD_ADC_REV     0xA1    /* ADC select Reverse                                 */
 112#define LCD_DSP_NRM     0xA6    /* LCD display Normal                                 */
 113#define LCD_DSP_REV     0xA7    /* LCD display Reverse                                */
 114#define LCD_DPT_NRM     0xA4    /* Display all points Normal                          */
 115#define LCD_DPT_ALL     0xA5    /* Display all points ON                              */
 116#define LCD_BIAS9       0xA2    /* LCD bias set 1/9                                   */
 117#define LCD_BIAS7       0xA3    /* LCD bias set 1/7                                   */
 118#define LCD_CAINC       0xE0    /* Read/modify/write                                  */
 119#define LCD_CAEND       0xEE    /* End                                                */
 120#define LCD_RESET       0xE2    /* Reset                                              */
 121#define LCD_C_NRM       0xC0    /* Common output mode select Normal direction         */
 122#define LCD_C_RVS       0xC8    /* Common output mode select Reverse direction        */
 123#define LCD_PWRMD       0x28    /* Power control set + (3-bit) mode                   */
 124#define LCD_RESRT       0x20    /* V5 v. reg. int. resistor ratio set + (3-bit) ratio */
 125#define LCD_EVSET       0x81    /* Electronic volume mode set + byte = (6-bit) volume */
 126#define LCD_SIOFF       0xAC    /* Static indicator OFF                               */
 127#define LCD_SION        0xAD    /* Static indicator ON + byte = (2-bit) mode          */
 128#define LCD_NOP         0xE3    /* NOP                                                */
 129#define LCD_TEST        0xF0    /* Test/Test mode reset (Note: *DO NOT USE*)          */
 130
 131/*-------------------------------------------------------------------------------
 132  Compound commands
 133  -------------------------------------------------------------------------------
 134  Command       Description                     Commands
 135  ----------    ------------------------        -------------------------------------
 136  POWS_ON       POWER SAVER ON command          LCD_OFF, LCD_D_ALL
 137  POWS_OFF      POWER SAVER OFF command         LCD_D_NRM
 138  SLEEPON       SLEEP mode                      LCD_SIOFF, POWS_ON
 139  SLEEPOFF      SLEEP mode cancel               LCD_D_NRM, LCD_SION, LCD_SIS_???
 140  STDBYON       STAND BY mode                   LCD_SION, POWS_ON
 141  STDBYOFF      STAND BY mode cancel            LCD_D_NRM
 142  -------------------------------------------------------------------------------*/
 143
 144/*** LCD various parameters ***/
 145#define LCD_PPB         8       /* Pixels per byte (display is B/W, 1 bit per pixel) */
 146
 147/*** LCD Status byte masks ***/
 148#define LCD_S_BUSY      0x80    /* Status Read - BUSY mask   */
 149#define LCD_S_ADC       0x40    /* Status Read - ADC mask    */
 150#define LCD_S_ONOFF     0x20    /* Status Read - ON/OFF mask */
 151#define LCD_S_RESET     0x10    /* Status Read - RESET mask  */
 152
 153/*** LCD commands parameter masks ***/
 154#define LCD_M_LADDR     0x3F    /* Display start line (6-bit) address mask           */
 155#define LCD_M_PADDR     0x0F    /* Page address (4-bit) page mask                    */
 156#define LCD_M_CADRH     0x0F    /* Column address upper (4-bit) column hi mask       */
 157#define LCD_M_CADRL     0x0F    /* Column address lower (4-bit) column lo mask       */
 158#define LCD_M_PWRMD     0x07    /* Power control (3-bit) mode mask                   */
 159#define LCD_M_RESRT     0x07    /* V5 v. reg. int. resistor ratio (3-bit) ratio mask */
 160#define LCD_M_EVSET     0x3F    /* Electronic volume mode byte (6-bit) volume mask   */
 161#define LCD_M_SION      0x03    /* Static indicator ON (2-bit) mode mask             */
 162
 163/*** LCD Power control cirquits control masks ***/
 164#define LCD_PWRBSTR     0x04    /* Power control mode - Booster cirquit ON           */
 165#define LCD_PWRVREG     0x02    /* Power control mode - Voltage regulator cirquit ON */
 166#define LCD_PWRVFOL     0x01    /* Power control mode - Voltage follower cirquit ON  */
 167
 168/*** LCD Static indicator states ***/
 169#define LCD_SIS_OFF     0x00    /* Static indicator register set - OFF state             */
 170#define LCD_SIS_BL      0x01    /* Static indicator register set - 1s blink state        */
 171#define LCD_SIS_RBL     0x02    /* Static indicator register set - .5s rapid blink state */
 172#define LCD_SIS_ON      0x03    /* Static indicator register set - constantly on state   */
 173
 174/*** LCD functions special parameters (commands) ***/
 175#define LCD_PREVP       0x80    /* Page number for moving to previous */
 176#define LCD_NEXTP       0x81    /* or next page */
 177#define LCD_ERR_P       0xFF    /* Error in page number */
 178
 179/*** LCD initialization settings ***/
 180#define LCD_BIAS        LCD_BIAS9       /* Bias: 1/9                  */
 181#define LCD_ADCMODE     LCD_ADC_NRM     /* ADC mode: normal           */
 182#define LCD_COMDIR      LCD_C_NRM       /* Common output mode: normal */
 183#define LCD_RRATIO      0               /* Resistor ratio: 0          */
 184#define LCD_CNTRST      0x1C            /* electronic volume: 1Ch     */
 185#define LCD_POWERM      (LCD_PWRBSTR | LCD_PWRVREG | LCD_PWRVFOL)       /* Power mode: All on */
 186
 187/**************************************************************************************/
 188
 189static inline unsigned int sed156x_transfer(unsigned int val)
 190{
 191        unsigned int rx;
 192        int b;
 193
 194        rx = 0; b = 8;
 195        while (--b >= 0) {
 196                SED156X_SPI_TXD(val & 0x80);
 197                val <<= 1;
 198                SED156X_SPI_CLK_TOGGLE();
 199                SED156X_SPI_BIT_DELAY();
 200                rx <<= 1;
 201                if (SED156X_SPI_RXD())
 202                        rx |= 1;
 203                SED156X_SPI_CLK_TOGGLE();
 204                SED156X_SPI_BIT_DELAY();
 205        }
 206
 207        return rx;
 208}
 209
 210unsigned int sed156x_data_transfer(unsigned int val)
 211{
 212        unsigned int rx;
 213
 214        SED156X_SPI_CLK(1);
 215        SED156X_CS(0);
 216        SED156X_A0(1);
 217
 218        rx = sed156x_transfer(val);
 219
 220        SED156X_CS(1);
 221
 222        return rx;
 223}
 224
 225void sed156x_data_block_transfer(const u8 *p, int size)
 226{
 227        SED156X_SPI_CLK(1);
 228        SED156X_CS(0);
 229        SED156X_A0(1);
 230
 231        while (--size >= 0)
 232                sed156x_transfer(*p++);
 233
 234        SED156X_CS(1);
 235}
 236
 237unsigned int sed156x_cmd_transfer(unsigned int val)
 238{
 239        unsigned int rx;
 240
 241        SED156X_SPI_CLK(1);
 242        SED156X_CS(0);
 243        SED156X_A0(0);
 244
 245        rx = sed156x_transfer(val);
 246
 247        SED156X_CS(1);
 248        SED156X_A0(1);
 249
 250        return rx;
 251}
 252
 253/******************************************************************************/
 254
 255static u8 hw_screen[LCD_PAGES][LCD_COLUMNS];
 256static u8 last_hw_screen[LCD_PAGES][LCD_COLUMNS];
 257static u8 sw_screen[LCD_BYTE_WIDTH * LCD_HEIGHT];
 258
 259void sed156x_sync(void)
 260{
 261        int i, j, last_page;
 262        u8 *d;
 263        const u8 *s, *e, *b, *r;
 264        u8 v0, v1, v2, v3, v4, v5, v6, v7;
 265
 266        /* copy and rotate sw_screen to hw_screen */
 267        for (i = 0; i < LCD_HEIGHT / 8; i++) {
 268
 269                d = &hw_screen[i][0];
 270                s = &sw_screen[LCD_BYTE_WIDTH * 8 * i + LCD_BYTE_WIDTH - 1];
 271
 272                for (j = 0; j < LCD_WIDTH / 8; j++) {
 273
 274                        v0 = s[0 * LCD_BYTE_WIDTH];
 275                        v1 = s[1 * LCD_BYTE_WIDTH];
 276                        v2 = s[2 * LCD_BYTE_WIDTH];
 277                        v3 = s[3 * LCD_BYTE_WIDTH];
 278                        v4 = s[4 * LCD_BYTE_WIDTH];
 279                        v5 = s[5 * LCD_BYTE_WIDTH];
 280                        v6 = s[6 * LCD_BYTE_WIDTH];
 281                        v7 = s[7 * LCD_BYTE_WIDTH];
 282
 283                        d[0] =  ((v7 & 0x01) << 7) |
 284                                ((v6 & 0x01) << 6) |
 285                                ((v5 & 0x01) << 5) |
 286                                ((v4 & 0x01) << 4) |
 287                                ((v3 & 0x01) << 3) |
 288                                ((v2 & 0x01) << 2) |
 289                                ((v1 & 0x01) << 1) |
 290                                 (v0 & 0x01)       ;
 291
 292                        d[1] =  ((v7 & 0x02) << 6) |
 293                                ((v6 & 0x02) << 5) |
 294                                ((v5 & 0x02) << 4) |
 295                                ((v4 & 0x02) << 3) |
 296                                ((v3 & 0x02) << 2) |
 297                                ((v2 & 0x02) << 1) |
 298                                ((v1 & 0x02) << 0) |
 299                                ((v0 & 0x02) >> 1) ;
 300
 301                        d[2] =  ((v7 & 0x04) << 5) |
 302                                ((v6 & 0x04) << 4) |
 303                                ((v5 & 0x04) << 3) |
 304                                ((v4 & 0x04) << 2) |
 305                                ((v3 & 0x04) << 1) |
 306                                 (v2 & 0x04)       |
 307                                ((v1 & 0x04) >> 1) |
 308                                ((v0 & 0x04) >> 2) ;
 309
 310                        d[3] =  ((v7 & 0x08) << 4) |
 311                                ((v6 & 0x08) << 3) |
 312                                ((v5 & 0x08) << 2) |
 313                                ((v4 & 0x08) << 1) |
 314                                 (v3 & 0x08)       |
 315                                ((v2 & 0x08) >> 1) |
 316                                ((v1 & 0x08) >> 2) |
 317                                ((v0 & 0x08) >> 3) ;
 318
 319                        d[4] =  ((v7 & 0x10) << 3) |
 320                                ((v6 & 0x10) << 2) |
 321                                ((v5 & 0x10) << 1) |
 322                                 (v4 & 0x10)       |
 323                                ((v3 & 0x10) >> 1) |
 324                                ((v2 & 0x10) >> 2) |
 325                                ((v1 & 0x10) >> 3) |
 326                                ((v0 & 0x10) >> 4) ;
 327
 328                        d[5] =  ((v7 & 0x20) << 2) |
 329                                ((v6 & 0x20) << 1) |
 330                                 (v5 & 0x20)       |
 331                                ((v4 & 0x20) >> 1) |
 332                                ((v3 & 0x20) >> 2) |
 333                                ((v2 & 0x20) >> 3) |
 334                                ((v1 & 0x20) >> 4) |
 335                                ((v0 & 0x20) >> 5) ;
 336
 337                        d[6] =  ((v7 & 0x40) << 1) |
 338                                 (v6 & 0x40)       |
 339                                ((v5 & 0x40) >> 1) |
 340                                ((v4 & 0x40) >> 2) |
 341                                ((v3 & 0x40) >> 3) |
 342                                ((v2 & 0x40) >> 4) |
 343                                ((v1 & 0x40) >> 5) |
 344                                ((v0 & 0x40) >> 6) ;
 345
 346                        d[7] =   (v7 & 0x80)       |
 347                                ((v6 & 0x80) >> 1) |
 348                                ((v5 & 0x80) >> 2) |
 349                                ((v4 & 0x80) >> 3) |
 350                                ((v3 & 0x80) >> 4) |
 351                                ((v2 & 0x80) >> 5) |
 352                                ((v1 & 0x80) >> 6) |
 353                                ((v0 & 0x80) >> 7) ;
 354
 355                        d += 8;
 356                        s--;
 357                }
 358        }
 359
 360        /* and now output only the differences */
 361        for (i = 0; i < LCD_PAGES; i++) {
 362
 363                b = &hw_screen[i][0];
 364                e = &hw_screen[i][LCD_COLUMNS];
 365
 366                d = &last_hw_screen[i][0];
 367                s = b;
 368
 369                last_page = -1;
 370
 371                /* update only the differences */
 372                do {
 373                        while (s < e && *s == *d) {
 374                                s++;
 375                                d++;
 376                        }
 377                        if (s == e)
 378                                break;
 379                        r = s;
 380                        while (s < e && *s != *d)
 381                                *d++ = *s++;
 382
 383                        j = r - b;
 384
 385                        if (i != last_page) {
 386                                sed156x_cmd_transfer(LCD_PADDR | i);
 387                                last_page = i;
 388                        }
 389
 390                        sed156x_cmd_transfer(LCD_CADRH | ((j >> 4) & 0x0F));
 391                        sed156x_cmd_transfer(LCD_CADRL | (j & 0x0F));
 392                        sed156x_data_block_transfer(r, s - r);
 393
 394                } while (s < e);
 395        }
 396
 397/********
 398        for (i = 0; i < LCD_PAGES; i++) {
 399                sed156x_cmd_transfer(LCD_PADDR | i);
 400                sed156x_cmd_transfer(LCD_CADRH | 0);
 401                sed156x_cmd_transfer(LCD_CADRL | 0);
 402                sed156x_data_block_transfer(&hw_screen[i][0], LCD_COLUMNS);
 403        }
 404        memcpy(last_hw_screen, hw_screen, sizeof(last_hw_screen));
 405********/
 406}
 407
 408void sed156x_clear(void)
 409{
 410        memset(sw_screen, 0, sizeof(sw_screen));
 411}
 412
 413void sed156x_output_at(int x, int y, const char *str, int size)
 414{
 415        int i, j;
 416        u8 *p;
 417        const u8 *s;
 418
 419        if ((unsigned int)y >= LCD_TEXT_HEIGHT || (unsigned int)x >= LCD_TEXT_WIDTH)
 420                return;
 421
 422        p = &sw_screen[y * VIDEO_FONT_HEIGHT * LCD_BYTE_WIDTH + x * VIDEO_FONT_BYTE_WIDTH];
 423
 424        while (--size >= 0) {
 425
 426                s = &video_fontdata[((int)*str++ & 0xff) * VIDEO_FONT_BYTE_WIDTH * VIDEO_FONT_HEIGHT];
 427                for (i = 0; i < VIDEO_FONT_HEIGHT; i++) {
 428                        for (j = 0; j < VIDEO_FONT_BYTE_WIDTH; j++)
 429                                *p++ = *s++;
 430                        p += LCD_BYTE_WIDTH - VIDEO_FONT_BYTE_WIDTH;
 431                }
 432                p -= (LCD_BYTE_LINESZ - VIDEO_FONT_BYTE_WIDTH);
 433
 434                if (x >= LCD_TEXT_WIDTH)
 435                        break;
 436                x++;
 437        }
 438}
 439
 440void sed156x_reverse_at(int x, int y, int size)
 441{
 442        int i, j;
 443        u8 *p;
 444
 445        if ((unsigned int)y >= LCD_TEXT_HEIGHT || (unsigned int)x >= LCD_TEXT_WIDTH)
 446                return;
 447
 448        p = &sw_screen[y * VIDEO_FONT_HEIGHT * LCD_BYTE_WIDTH + x * VIDEO_FONT_BYTE_WIDTH];
 449
 450        while (--size >= 0) {
 451
 452                for (i = 0; i < VIDEO_FONT_HEIGHT; i++) {
 453                        for (j = 0; j < VIDEO_FONT_BYTE_WIDTH; j++, p++)
 454                                *p = ~*p;
 455                        p += LCD_BYTE_WIDTH - VIDEO_FONT_BYTE_WIDTH;
 456                }
 457                p -= (LCD_BYTE_LINESZ - VIDEO_FONT_BYTE_WIDTH);
 458
 459                if (x >= LCD_TEXT_WIDTH)
 460                        break;
 461                x++;
 462        }
 463}
 464
 465void sed156x_scroll_line(void)
 466{
 467        memmove(&sw_screen[0],
 468                        &sw_screen[LCD_BYTE_LINESZ],
 469                        LCD_BYTE_WIDTH * (LCD_HEIGHT - VIDEO_FONT_HEIGHT));
 470}
 471
 472void sed156x_scroll(int dx, int dy)
 473{
 474        u8 *p1 = NULL, *p2 = NULL, *p3 = NULL;  /* pacify gcc */
 475        int adx, ady, i, sz;
 476
 477        adx = dx > 0 ? dx : -dx;
 478        ady = dy > 0 ? dy : -dy;
 479
 480        /* overscroll? erase everything */
 481        if (adx >= LCD_TEXT_WIDTH || ady >= LCD_TEXT_HEIGHT) {
 482                memset(sw_screen, 0, sizeof(sw_screen));
 483                return;
 484        }
 485
 486        sz = LCD_BYTE_LINESZ * ady;
 487        if (dy > 0) {
 488                p1 = &sw_screen[0];
 489                p2 = &sw_screen[sz];
 490                p3 = &sw_screen[LCD_BYTE_WIDTH * LCD_HEIGHT - sz];
 491        } else if (dy < 0) {
 492                p1 = &sw_screen[sz];
 493                p2 = &sw_screen[0];
 494                p3 = &sw_screen[0];
 495        }
 496
 497        if (ady > 0) {
 498                memmove(p1, p2, LCD_BYTE_WIDTH * LCD_HEIGHT - sz);
 499                memset(p3, 0, sz);
 500        }
 501
 502        sz = VIDEO_FONT_BYTE_WIDTH * adx;
 503        if (dx > 0) {
 504                p1 = &sw_screen[0];
 505                p2 = &sw_screen[0] + sz;
 506                p3 = &sw_screen[0] + LCD_BYTE_WIDTH - sz;
 507        } else if (dx < 0) {
 508                p1 = &sw_screen[0] + sz;
 509                p2 = &sw_screen[0];
 510                p3 = &sw_screen[0];
 511        }
 512
 513        /* xscroll */
 514        if (adx > 0) {
 515                for (i = 0; i < LCD_HEIGHT; i++) {
 516                        memmove(p1, p2, LCD_BYTE_WIDTH - sz);
 517                        memset(p3, 0, sz);
 518                        p1 += LCD_BYTE_WIDTH;
 519                        p2 += LCD_BYTE_WIDTH;
 520                        p3 += LCD_BYTE_WIDTH;
 521                }
 522        }
 523}
 524
 525void sed156x_init(void)
 526{
 527        int i;
 528
 529        SED156X_CS(1);
 530        SED156X_A0(1);
 531
 532        /* Send initialization commands to the LCD */
 533        sed156x_cmd_transfer(LCD_OFF);                  /* Turn display OFF       */
 534        sed156x_cmd_transfer(LCD_BIAS);                 /* set the LCD Bias,      */
 535        sed156x_cmd_transfer(LCD_ADCMODE);              /* ADC mode,              */
 536        sed156x_cmd_transfer(LCD_COMDIR);               /* common output mode,    */
 537        sed156x_cmd_transfer(LCD_RESRT | LCD_RRATIO);   /* resistor ratio,        */
 538        sed156x_cmd_transfer(LCD_EVSET);                /* electronic volume,     */
 539        sed156x_cmd_transfer(LCD_CNTRST);
 540        sed156x_cmd_transfer(LCD_PWRMD | LCD_POWERM);   /* and power mode         */
 541        sed156x_cmd_transfer(LCD_PADDR | 0);            /* cursor home            */
 542        sed156x_cmd_transfer(LCD_CADRH | 0);
 543        sed156x_cmd_transfer(LCD_CADRL | 0);
 544        sed156x_cmd_transfer(LCD_LADDR | 0);            /* and display start line */
 545        sed156x_cmd_transfer(LCD_DSP_NRM);              /* LCD display Normal     */
 546
 547        /* clear everything */
 548        memset(sw_screen, 0, sizeof(sw_screen));
 549        memset(hw_screen, 0, sizeof(hw_screen));
 550        memset(last_hw_screen, 0, sizeof(last_hw_screen));
 551
 552        for (i = 0; i < LCD_PAGES; i++) {
 553                sed156x_cmd_transfer(LCD_PADDR | i);
 554                sed156x_cmd_transfer(LCD_CADRH | 0);
 555                sed156x_cmd_transfer(LCD_CADRL | 0);
 556                sed156x_data_block_transfer(&hw_screen[i][0], LCD_COLUMNS);
 557        }
 558
 559        sed156x_clear();
 560        sed156x_sync();
 561        sed156x_cmd_transfer(LCD_ON);                   /* Turn display ON        */
 562}
 563