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*/
514: DDR(LCD_DATA0_PORT) |= 0x7F;
515: }
516: else if ( ( &LCD_DATA0_PORT == &LCD_DATA1_PORT) && ( &LCD_DATA1_PORT
D:\juergen\Projekt\Projekt\prog\Frequenzzaehler\lcd.c
== &LCD_DATA2_PORT ) && ( &LCD_DATA2_PORT == &LCD_DATA3_PORT )
517: && (LCD_DATA0_PIN == 0 ) && (LCD_DATA1_PIN == 1) &&
(LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3) )
518: {
519: /* configure all port bits as output (all LCD data lines on same
port, but control lines on different ports) */
520: DDR(LCD_DATA0_PORT) |= 0x0F;
521: DDR(LCD_RS_PORT) |= _BV(LCD_RS_PIN);
522: DDR(LCD_RW_PORT) |= _BV(LCD_RW_PIN);
523: DDR(LCD_E_PORT) |= _BV(LCD_E_PIN);
524: }
525: else
526: {
527: /* configure all port bits as output (LCD data and control lines
on different ports */
528: DDR(LCD_RS_PORT) |= _BV(LCD_RS_PIN);
529: DDR(LCD_RW_PORT) |= _BV(LCD_RW_PIN);
530: DDR(LCD_E_PORT) |= _BV(LCD_E_PIN);
531: DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN);
532: DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN);
533: DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN);
534: DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN);
535: }
536: delay(16000); /* wait 16ms or more after power-on */
537:
538: /* initial write to lcd is 8bit */
539: LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN); // _BV(LCD_FUNCTION)>>4;
540: LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN); // _BV(LCD_FUNCTION_8BIT)>>4;
541: lcd_e_toggle();
542: delay(4992); /* delay, busy flag can't be checked here */
543:
544: /* repeat last command */
545: lcd_e_toggle();
546: delay(64); /* delay, busy flag can't be checked here */
547:
548: /* repeat last command a third time */
549: lcd_e_toggle();
550: delay(64); /* delay, busy flag can't be checked here */
551:
552: /* now configure for 4bit mode */
553: LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN); //
LCD_FUNCTION_4BIT_1LINE>>4
554: lcd_e_toggle();
555: delay(64); /* some displays need this additional delay */
556:
557: /* from now the LCD only accepts 4 bit I/O, we can use lcd_command()
*/
558: #else
559: /*
560: * Initialize LCD to 8 bit memory mapped mode
561: */
562:
563: /* enable external SRAM (memory mapped lcd) and one wait state */
564: MCUCR = _BV(SRE) | _BV(SRW);
565:
566: /* reset LCD */
567: delay(16000); /* wait 16ms after power-on
*/
568: lcd_write(LCD_FUNCTION_8BIT_1LINE,0); /* function set: 8bit
interface */
569: delay(4992); /* wait 5ms
*/
570: lcd_write(LCD_FUNCTION_8BIT_1LINE,0); /* function set: 8bit
interface */
571: delay(64); /* wait 64us
*/
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