bertos/drv/lcd_hd44.c

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  25  * the GNU General Public License.  This exception does not however
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  27  * the GNU General Public License.
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  29  * Copyright 2005 Develer S.r.l. (http://www.develer.com/)
  30  *
  31  * -->
  32  *
  33  * \brief LM044L type LCD hardware module (impl.)
  34  *
  35  * \version $Id$
  36  *
  37  * \author Bernardo Innocenti <bernie@develer.com>
  38  * \author Stefano Fedrigo <aleph@develer.com>
  39  */
  40
  41 #include "lcd_hd44.h"
  42
  43 #include "hw/hw_lcd.h"
  44
  45 #include "cfg/cfg_arch.h"
  46
  47 #include <drv/timer.h>
  48
  49 #warning FIXME: Revise and refactor this code.
  50
  51 #if defined(LCD_READ_H) && defined(LCD_READ_L) && defined(LCD_WRITE_H) && defined(LCD_WRITE_L)
  52         #define CONFIG_LCD_4BIT 1
  53 #elif defined(LCD_READ) && defined(LCD_WRITE)
  54         #define CONFIG_LCD_4BIT 0
  55 #else
  56         #error Incomplete or missing LCD_READ/LCD_WRITE macros
  57 #endif
  58
  59 /** Flag di stato del display */
  60 #define LCDF_BUSY  BV(7)
  61
  62 #if CONFIG_LCD_ADDRESS_FAST == 1
  63 #define lcd_address(x) lcd_address[x]
  64 /**
  65  * Addresses of LCD display character positions, expanded
  66  * for faster access (DB7 = 1).
  67  */
  68 static const uint8_t lcd_address[] =
  69 {
  70         /* row 0 */
  71         0x80, 0x81, 0x82, 0x83,
  72         0x84, 0x85, 0x86, 0x87,
  73         0x88, 0x89, 0x8A, 0x8B,
  74         0x8C, 0x8D, 0x8E, 0x8F,
  75 #if LCD_COLS > 16
  76         0x90, 0x91, 0x92, 0x93,
  77 #endif
  78
  79         /* row 1 */
  80         0xC0, 0xC1, 0xC2, 0xC3,
  81         0xC4, 0xC5, 0xC6, 0xC7,
  82         0xC8, 0xC9, 0xCA, 0xCB,
  83         0xCC, 0xCD, 0xCE, 0xCF,
  84 #if LCD_COLS > 16
  85         0xD0, 0xD1, 0xD2, 0xD3,
  86 #endif
  87
  88 #if LCD_ROWS > 2
  89         /* row 2 */
  90         0x94, 0x95, 0x96, 0x97,
  91         0x98, 0x99, 0x9A, 0x9B,
  92         0x9C, 0x9D, 0x9E, 0x9F,
  93         0xA0, 0xA1, 0xA2, 0xA3,
  94 #if LCD_COLS > 16
  95         0xA4, 0xA5, 0xA6, 0xA7,
  96 #endif
  97
  98         /* row 3 */
  99         0xD4, 0xD5, 0xD6, 0xD7,
 100         0xD8, 0xD9, 0xDA, 0xDB,
 101         0xDC, 0xDD, 0xDE, 0xDF,
 102         0xE0, 0xE1, 0xE2, 0xE3,
 103 #if LCD_COLS > 16
 104         0xE4, 0xE5, 0xE6, 0xE7,
 105 #endif
 106
 107 #endif /* LCD_ROWS > 2 */
 108 };
 109
 110 STATIC_ASSERT(countof(lcd_address) == LCD_ROWS * LCD_COLS);
 111 #else  /* CONFIG_LCD_ADDRESS_FAST == 0 */
 112
 113 static const uint8_t col_address[] =
 114 {
 115         0x80,
 116         0xC0,
 117 #if LCD_ROWS > 2
 118         0x94,
 119         0xD4
 120 #endif
 121 };
 122 STATIC_ASSERT(countof(col_address) == LCD_ROWS);
 123 /**
 124  * Addresses of LCD display character positions, calculated runtime to save RAM
 125  */
 126 static uint8_t lcd_address(uint8_t addr)
 127 {
 128         return col_address[addr / LCD_COLS] + addr % LCD_COLS;
 129 }
 130 #endif /* CONFIG_LCD_ADDRESS_FAST */
 131
 132 /**
 133  * Current display position. We remember this to optimize
 134  * LCD output by avoiding to set the address every time.
 135  */
 136 static lcdpos_t lcd_current_addr;
 137
 138
 139 #if !defined(ARCH_EMUL) || !(ARCH & ARCH_EMUL)
 140 /*      __________________
 141  * RS
 142  *
 143  * R/W  __________________
 144  *            _______
 145  * ENA  _____/       \____
 146  *
 147  * DATA -<================
 148  */
 149 INLINE void lcd_dataWrite(uint8_t data)
 150 {
 151 #if CONFIG_LCD_4BIT
 152         /* Write high nibble */
 153         LCD_WRITE_H(data);
 154         LCD_SET_E;
 155         LCD_DELAY_WRITE;
 156         LCD_CLR_E;
 157         LCD_DELAY_WRITE;
 158
 159         /* Write low nibble */
 160         LCD_WRITE_L(data);
 161         LCD_SET_E;
 162         LCD_DELAY_WRITE;
 163         LCD_CLR_E;
 164         LCD_DELAY_WRITE;
 165
 166 #else /* !CONFIG_LCD_4BIT */
 167
 168         /* Write data */
 169         LCD_WRITE(data);
 170         LCD_SET_E;
 171         LCD_DELAY_WRITE;
 172         LCD_CLR_E;
 173         LCD_DELAY_WRITE;
 174
 175 #endif /* !CONFIG_LCD_4BIT */
 176 }
 177
 178 /*      __________________
 179  * RS
 180  *         ____________
 181  * R/W  __/            \__
 182  *            _______
 183  * ENA  _____/       \____
 184  *        ______      ____
 185  * DATA X/      \====/
 186  */
 187 INLINE uint8_t lcd_dataRead(void)
 188 {
 189         uint8_t data;
 190
 191         LCD_SET_RD;
 192         LCD_DB_IN;      /* Set bus as input! */
 193         LCD_DELAY_READ;
 194
 195 #if CONFIG_LCD_4BIT
 196
 197         /* Read high nibble */
 198         LCD_SET_E;
 199         LCD_DELAY_READ;
 200         data = LCD_READ_H;
 201         LCD_CLR_E;
 202         LCD_DELAY_READ;
 203
 204         /* Read low nibble */
 205         LCD_SET_E;
 206         LCD_DELAY_READ;
 207         data |= LCD_READ_L;
 208         LCD_CLR_E;
 209         LCD_DELAY_READ;
 210
 211 #else /* !CONFIG_LCD_4BIT */
 212
 213         /* Read data */
 214         LCD_SET_E;
 215         LCD_DELAY_READ;
 216         data = LCD_READ;
 217         LCD_CLR_E;
 218         LCD_DELAY_READ;
 219
 220 #endif /* !CONFIG_LCD_4BIT */
 221
 222         LCD_CLR_RD;
 223         LCD_DB_OUT;     /* Reset bus as output! */
 224
 225         return data;
 226 }
 227
 228 /*      ___             __
 229  * RS      \___________/
 230  *
 231  * READ __________________
 232  *            _______
 233  * ENA  _____/       \____
 234  *
 235  * DATA --<===============
 236  */
 237 INLINE void lcd_regWrite(uint8_t data)
 238 {
 239         LCD_CLR_RS;
 240         lcd_dataWrite(data);
 241         LCD_SET_RS;
 242 }
 243
 244 /*      __               _
 245  * RS     \_____________/
 246  *          ___________
 247  * READ ___/           \__
 248  *            _______
 249  * ENA  _____/       \____
 250  *        ______      ____
 251  * DATA X/      \====/
 252  */
 253 INLINE uint8_t lcd_regRead(void)
 254 {
 255         uint8_t data;
 256
 257         LCD_CLR_RS;
 258         data = lcd_dataRead();
 259         LCD_SET_RS;
 260         return data;
 261 }
 262
 263 #if CONFIG_LCD_4BIT
 264
 265 INLINE void lcd_mode4Bit(void)
 266 {
 267         LCD_CLR_RS;
 268
 269         LCD_WRITE_H(LCD_CMD_SETFUNC);
 270         LCD_SET_E;
 271         LCD_DELAY_WRITE;
 272         LCD_CLR_E;
 273         LCD_DELAY_WRITE;
 274
 275         LCD_SET_RS;
 276 }
 277
 278 #endif /* CONFIG_LCD_4BIT */
 279
 280 #else /* ARCH_EMUL */
 281
 282 extern void Emul_LCDWriteReg(uint8_t d);
 283 extern uint8_t Emul_LCDReadReg(void);
 284 extern void Emul_LCDWriteData(uint8_t d);
 285 extern uint8_t Emul_LCDReadData(void);
 286
 287 #define lcd_regWrite(d)   Emul_LCDWriteReg(d)
 288 #define lcd_regRead(d)    Emul_LCDReadReg()
 289 #define lcd_dataWrite(d)  Emul_LCDWriteData(d)
 290 #define lcd_dataRead(d)   Emul_LCDReadData()
 291
 292 #endif /* ARCH_EMUL */
 293
 294
 295 /**
 296  * Wait until the LCD busy flag clears.
 297  */
 298 void lcd_waitBusy(void)
 299 {
 300         for (;;)
 301         {
 302                 uint8_t val = lcd_regRead();
 303                 if (!(val & LCDF_BUSY))
 304                         break;
 305         }
 306 }
 307
 308
 309 /**
 310  * Move the cursor to \a addr, only if not already there.
 311  */
 312 void lcd_moveTo(uint8_t addr)
 313 {
 314         if (addr != lcd_current_addr)
 315         {
 316                 lcd_waitBusy();
 317                 lcd_regWrite(lcd_address(addr));
 318                 lcd_current_addr = addr;
 319         }
 320 }
 321
 322
 323 /**
 324  * Write a value in LCD data register, waiting for the busy flag.
 325  */
 326 void lcd_setReg(uint8_t val)
 327 {
 328         lcd_waitBusy();
 329         lcd_regWrite(val);
 330 }
 331
 332 #include <cfg/debug.h>
 333 /**
 334  * Write the character \a c on display address \a addr.
 335  *
 336  * NOTE: argh, the HD44 lcd type is a bad beast: our
 337  * move/write -> write optimization requires this mess
 338  * because display lines are interleaved!
 339  */
 340 void lcd_putc(uint8_t addr, uint8_t c)
 341 {
 342         if (addr != lcd_current_addr)
 343                 lcd_setReg(lcd_address(addr));
 344
 345         lcd_waitBusy();
 346         lcd_dataWrite(c);
 347         lcd_current_addr = addr + 1;
 348
 349         /* If we are at end of display wrap the address to 0 */
 350         if (lcd_current_addr == LCD_COLS * LCD_ROWS)
 351                 lcd_current_addr = 0;
 352
 353         /* If we are at the end of a row put the cursor at the beginning of the next */
 354         if (!(lcd_current_addr % LCD_COLS))
 355                 lcd_setReg(lcd_address(lcd_current_addr));
 356 }
 357
 358
 359 /**
 360  * Remap the glyph of a character.
 361  *
 362  * glyph - bitmap of 8x8 bits.
 363  * code - must be 0-7 for the Hitachi LCD-II controller.
 364  */
 365 void lcd_remapChar(const char *glyph, char code)
 366 {
 367         int i;
 368
 369         /* Set CG RAM address */
 370         lcd_setReg((uint8_t)((1<<6) | (code << 3)));
 371
 372         /* Write bitmap data */
 373         for (i = 0; i < 8; i++)
 374         {
 375                 lcd_waitBusy();
 376                 lcd_dataWrite(glyph[i]);
 377         }
 378
 379         /* Move back to original address */
 380         lcd_setReg(lcd_address(lcd_current_addr));
 381 }
 382
 383
 384 #if 0 /* unused */
 385 void lcd_remapfont(void)
 386 {
 387         static const char lcd_glyphs[8] =
 388         {
 389                 0x04, 0x0E, 0x15, 0x04, 0x04, 0x04, 0x04, 0x00 /* up arrow */
 390         };
 391         int i;
 392
 393         for (i = 0; i < 15; i++)
 394                 lcd_remapChar(i, bernie_char);
 395
 396
 397         lcd_setAddr(lcd_DefLayer, 0);
 398         for (i = 0; i < 80; i++)
 399                 lcd_putCharUnlocked(i);
 400 }
 401 #endif /* unused */
 402
 403 void lcd_hw_init(void)
 404 {
 405         lcd_bus_init();
 406
 407         timer_delay(50);
 408
 409 #if CONFIG_LCD_4BIT
 410         lcd_mode4Bit();
 411         timer_delay(2);
 412 #endif /* CONFIG_LCD_4BIT */
 413
 414         lcd_regWrite(LCD_CMD_SETFUNC);
 415         timer_delay(2);
 416
 417         lcd_regWrite(LCD_CMD_DISPLAY_ON);
 418         timer_delay(2);
 419
 420         lcd_regWrite(LCD_CMD_CLEAR);
 421         timer_delay(2);
 422
 423 #if !CONFIG_LCD_4BIT
 424         lcd_regWrite(LCD_CMD_RESET_DDRAM); // 4 bit mode doesn't allow char reprogramming
 425 #endif
 426         lcd_regWrite(LCD_CMD_DISPLAYMODE);
 427         timer_delay(2);
 428 }
 429
 430