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1/****************************************************************************
2 Title: HD44780U LCD library
3 Author: Peter Fleury <pfleury@gmx.ch> http://tinyurl.com/peterfleury
4 License: GNU General Public License Version 3
5 File: $Id: lcd.c,v 1.15.2.2 2015/01/17 12:16:05 peter Exp $
6 Software: AVR-GCC 3.3
7 Target: any AVR device, memory mapped mode only for AT90S4414/8515/Mega
8
9 DESCRIPTION
10 Basic routines for interfacing a HD44780U-based text lcd display
11
12 Originally based on Volker Oth's lcd library,
13 changed lcd_init(), added additional constants for lcd_command(),
14 added 4-bit I/O mode, improved and optimized code.
15
16 Library can be operated in memory mapped mode (LCD_IO_MODE=0) or in
17 4-bit IO port mode (LCD_IO_MODE=1). 8-bit IO port mode not supported.
18
19 Memory mapped mode compatible with Kanda STK200, but supports also
20 generation of R/W signal through A8 address line.
21
22 USAGE
23 See the C include lcd.h file for a description of each function
24
25*****************************************************************************/
26#include <inttypes.h>
27#include <avr/io.h>
28#include <avr/pgmspace.h>
29#include <util/delay.h>
30#include "hd44780.h"
31
32/*
33** constants/macros
34*/
35#define DDR(x) (*(&x - 1)) /* address of data direction register of port x */
36#if defined(__AVR_ATmega64__) || defined(__AVR_ATmega128__)
37 /* on ATmega64/128 PINF is on port 0x00 and not 0x60 */
38 #define PIN(x) ( &PORTF==&(x) ? _SFR_IO8(0x00) : (*(&x - 2)) )
39#else
40 #define PIN(x) (*(&x - 2)) /* address of input register of port x */
41#endif
42
43
44#if LCD_IO_MODE
45#define lcd_e_delay() _delay_us(LCD_DELAY_ENABLE_PULSE)
46#define lcd_e_high() LCD_E_PORT |= _BV(LCD_E_PIN);
47#define lcd_e_low() LCD_E_PORT &= ~_BV(LCD_E_PIN);
48#define lcd_e_toggle() toggle_e()
49#define lcd_rw_high() LCD_RW_PORT |= _BV(LCD_RW_PIN)
50#define lcd_rw_low() LCD_RW_PORT &= ~_BV(LCD_RW_PIN)
51#define lcd_rs_high() LCD_RS_PORT |= _BV(LCD_RS_PIN)
52#define lcd_rs_low() LCD_RS_PORT &= ~_BV(LCD_RS_PIN)
53#endif
54
55#if LCD_IO_MODE
56#if LCD_LINES==1
57#define LCD_FUNCTION_DEFAULT LCD_FUNCTION_4BIT_1LINE
58#else
59#define LCD_FUNCTION_DEFAULT LCD_FUNCTION_4BIT_2LINES
60#endif
61#else
62#if LCD_LINES==1
63#define LCD_FUNCTION_DEFAULT LCD_FUNCTION_8BIT_1LINE
64#else
65#define LCD_FUNCTION_DEFAULT LCD_FUNCTION_8BIT_2LINES
66#endif
67#endif
68
69#if LCD_CONTROLLER_KS0073
70#if LCD_LINES==4
71
72#define KS0073_EXTENDED_FUNCTION_REGISTER_ON 0x2C /* |0|010|1100 4-bit mode, extension-bit RE = 1 */
73#define KS0073_EXTENDED_FUNCTION_REGISTER_OFF 0x28 /* |0|010|1000 4-bit mode, extension-bit RE = 0 */
74#define KS0073_4LINES_MODE 0x09 /* |0|000|1001 4 lines mode */
75
76#endif
77#endif
78
79/*
80** function prototypes
81*/
82#if LCD_IO_MODE
83static void toggle_e(void);
84#endif
85
86/*
87** local functions
88*/
89
90
91/*************************************************************************
92delay for a minimum of <us> microseconds
93the number of loops is calculated at compile-time from MCU clock frequency
94*************************************************************************/
95#define delay(us) _delay_us(us)
96
97
98#if LCD_IO_MODE
99/* toggle Enable Pin to initiate write */
100static void toggle_e(void)
101{
102 lcd_e_high();
103 lcd_e_delay();
104 lcd_e_low();
105}
106#endif
107
108
109/*************************************************************************
110Low-level function to write byte to LCD controller
111Input: data byte to write to LCD
112 rs 1: write data
113 0: write instruction
114Returns: none
115*************************************************************************/
116#if LCD_IO_MODE
117static void lcd_write(uint8_t data,uint8_t rs)
118{
119 unsigned char dataBits ;
120
121
122 if (rs) { /* write data (RS=1, RW=0) */
123 lcd_rs_high();
124 } else { /* write instruction (RS=0, RW=0) */
125 lcd_rs_low();
126 }
127 lcd_rw_low(); /* RW=0 write mode */
128
129 if ( ( &LCD_DATA0_PORT == &LCD_DATA1_PORT) && ( &LCD_DATA1_PORT == &LCD_DATA2_PORT ) && ( &LCD_DATA2_PORT == &LCD_DATA3_PORT )
130 && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3) )
131 {
132 /* configure data pins as output */
133 DDR(LCD_DATA0_PORT) |= 0x0F;
134
135 /* output high nibble first */
136 dataBits = LCD_DATA0_PORT & 0xF0;
137 LCD_DATA0_PORT = dataBits |((data>>4)&0x0F);
138 lcd_e_toggle();
139
140 /* output low nibble */
141 LCD_DATA0_PORT = dataBits | (data&0x0F);
142 lcd_e_toggle();
143
144 /* all data pins high (inactive) */
145 LCD_DATA0_PORT = dataBits | 0x0F;
146 }
147 else
148 {
149 /* configure data pins as output */
150 DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN);
151 DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN);
152 DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN);
153 DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN);
154
155 /* output high nibble first */
156 LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN);
157 LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN);
158 LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN);
159 LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN);
160 if(data & 0x80) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
161 if(data & 0x40) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
162 if(data & 0x20) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
163 if(data & 0x10) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
164 lcd_e_toggle();
165
166 /* output low nibble */
167 LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN);
168 LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN);
169 LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN);
170 LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN);
171 if(data & 0x08) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
172 if(data & 0x04) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
173 if(data & 0x02) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
174 if(data & 0x01) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
175 lcd_e_toggle();
176
177 /* all data pins high (inactive) */
178 LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
179 LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
180 LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
181 LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
182 }
183}
184#else
185#define lcd_write(d,rs) if (rs) *(volatile uint8_t*)(LCD_IO_DATA) = d; else *(volatile uint8_t*)(LCD_IO_FUNCTION) = d;
186/* rs==0 -> write instruction to LCD_IO_FUNCTION */
187/* rs==1 -> write data to LCD_IO_DATA */
188#endif
189
190
191/*************************************************************************
192Low-level function to read byte from LCD controller
193Input: rs 1: read data
194 0: read busy flag / address counter
195Returns: byte read from LCD controller
196*************************************************************************/
197#if LCD_IO_MODE
198static uint8_t lcd_read(uint8_t rs)
199{
200 uint8_t data;
201
202
203 if (rs)
204 lcd_rs_high(); /* RS=1: read data */
205 else
206 lcd_rs_low(); /* RS=0: read busy flag */
207 lcd_rw_high(); /* RW=1 read mode */
208
209 if ( ( &LCD_DATA0_PORT == &LCD_DATA1_PORT) && ( &LCD_DATA1_PORT == &LCD_DATA2_PORT ) && ( &LCD_DATA2_PORT == &LCD_DATA3_PORT )
210 && ( LCD_DATA0_PIN == 0 )&& (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3) )
211 {
212 DDR(LCD_DATA0_PORT) &= 0xF0; /* configure data pins as input */
213
214 lcd_e_high();
215 lcd_e_delay();
216 data = PIN(LCD_DATA0_PORT) << 4; /* read high nibble first */
217 lcd_e_low();
218
219 lcd_e_delay(); /* Enable 500ns low */
220
221 lcd_e_high();
222 lcd_e_delay();
223 data |= PIN(LCD_DATA0_PORT)&0x0F; /* read low nibble */
224 lcd_e_low();
225 }
226 else
227 {
228 /* configure data pins as input */
229 DDR(LCD_DATA0_PORT) &= ~_BV(LCD_DATA0_PIN);
230 DDR(LCD_DATA1_PORT) &= ~_BV(LCD_DATA1_PIN);
231 DDR(LCD_DATA2_PORT) &= ~_BV(LCD_DATA2_PIN);
232 DDR(LCD_DATA3_PORT) &= ~_BV(LCD_DATA3_PIN);
233
234 /* read high nibble first */
235 lcd_e_high();
236 lcd_e_delay();
237 data = 0;
238 if ( PIN(LCD_DATA0_PORT) & _BV(LCD_DATA0_PIN) ) data |= 0x10;
239 if ( PIN(LCD_DATA1_PORT) & _BV(LCD_DATA1_PIN) ) data |= 0x20;
240 if ( PIN(LCD_DATA2_PORT) & _BV(LCD_DATA2_PIN) ) data |= 0x40;
241 if ( PIN(LCD_DATA3_PORT) & _BV(LCD_DATA3_PIN) ) data |= 0x80;
242 lcd_e_low();
243
244 lcd_e_delay(); /* Enable 500ns low */
245
246 /* read low nibble */
247 lcd_e_high();
248 lcd_e_delay();
249 if ( PIN(LCD_DATA0_PORT) & _BV(LCD_DATA0_PIN) ) data |= 0x01;
250 if ( PIN(LCD_DATA1_PORT) & _BV(LCD_DATA1_PIN) ) data |= 0x02;
251 if ( PIN(LCD_DATA2_PORT) & _BV(LCD_DATA2_PIN) ) data |= 0x04;
252 if ( PIN(LCD_DATA3_PORT) & _BV(LCD_DATA3_PIN) ) data |= 0x08;
253 lcd_e_low();
254 }
255 return data;
256}
257#else
258#define lcd_read(rs) (rs) ? *(volatile uint8_t*)(LCD_IO_DATA+LCD_IO_READ) : *(volatile uint8_t*)(LCD_IO_FUNCTION+LCD_IO_READ)
259/* rs==0 -> read instruction from LCD_IO_FUNCTION */
260/* rs==1 -> read data from LCD_IO_DATA */
261#endif
262
263
264/*************************************************************************
265loops while lcd is busy, returns address counter
266*************************************************************************/
267static uint8_t lcd_waitbusy(void)
268
269{
270 register uint8_t c;
271
272 /* wait until busy flag is cleared */
273 while ( (c=lcd_read(0)) & (1<<LCD_BUSY)) {}
274
275 /* the address counter is updated 4us after the busy flag is cleared */
276 delay(LCD_DELAY_BUSY_FLAG);
277
278 /* now read the address counter */
279 return (lcd_read(0)); // return address counter
280
281}/* lcd_waitbusy */
282
283
284/*************************************************************************
285Move cursor to the start of next line or to the first line if the cursor
286is already on the last line.
287*************************************************************************/
288static inline void lcd_newline(uint8_t pos)
289{
290 register uint8_t addressCounter;
291
292
293#if LCD_LINES==1
294 addressCounter = 0;
295#endif
296#if LCD_LINES==2
297 if ( pos < (LCD_START_LINE2) )
298 addressCounter = LCD_START_LINE2;
299 else
300 addressCounter = LCD_START_LINE1;
301#endif
302#if LCD_LINES==4
303#if KS0073_4LINES_MODE
304 if ( pos < LCD_START_LINE2 )
305 addressCounter = LCD_START_LINE2;
306 else if ( (pos >= LCD_START_LINE2) && (pos < LCD_START_LINE3) )
307 addressCounter = LCD_START_LINE3;
308 else if ( (pos >= LCD_START_LINE3) && (pos < LCD_START_LINE4) )
309 addressCounter = LCD_START_LINE4;
310 else
311 addressCounter = LCD_START_LINE1;
312#else
313 if ( pos < LCD_START_LINE3 )
314 addressCounter = LCD_START_LINE2;
315 else if ( (pos >= LCD_START_LINE2) && (pos < LCD_START_LINE4) )
316 addressCounter = LCD_START_LINE3;
317 else if ( (pos >= LCD_START_LINE3) && (pos < LCD_START_LINE2) )
318 addressCounter = LCD_START_LINE4;
319 else
320 addressCounter = LCD_START_LINE1;
321#endif
322#endif
323 lcd_command((1<<LCD_DDRAM)+addressCounter);
324
325}/* lcd_newline */
326
327
328/*
329** PUBLIC FUNCTIONS
330*/
331
332/*************************************************************************
333Send LCD controller instruction command
334Input: instruction to send to LCD controller, see HD44780 data sheet
335Returns: none
336*************************************************************************/
337void lcd_command(uint8_t cmd)
338{
339 lcd_waitbusy();
340 lcd_write(cmd,0);
341}
342
343
344/*************************************************************************
345Send data byte to LCD controller
346Input: data to send to LCD controller, see HD44780 data sheet
347Returns: none
348*************************************************************************/
349void lcd_data(uint8_t data)
350{
351 lcd_waitbusy();
352 lcd_write(data,1);
353}
354
355
356
357/*************************************************************************
358Set cursor to specified position
359Input: x horizontal position (0: left most position)
360 y vertical position (0: first line)
361Returns: none
362*************************************************************************/
363void lcd_gotoxy(uint8_t x, uint8_t y)
364{
365#if LCD_LINES==1
366 lcd_command((1<<LCD_DDRAM)+LCD_START_LINE1+x);
367#endif
368#if LCD_LINES==2
369 if ( y==0 )
370 lcd_command((1<<LCD_DDRAM)+LCD_START_LINE1+x);
371 else
372 lcd_command((1<<LCD_DDRAM)+LCD_START_LINE2+x);
373#endif
374#if LCD_LINES==4
375 if ( y==0 )
376 lcd_command((1<<LCD_DDRAM)+LCD_START_LINE1+x);
377 else if ( y==1)
378 lcd_command((1<<LCD_DDRAM)+LCD_START_LINE2+x);
379 else if ( y==2)
380 lcd_command((1<<LCD_DDRAM)+LCD_START_LINE3+x);
381 else /* y==3 */
382 lcd_command((1<<LCD_DDRAM)+LCD_START_LINE4+x);
383#endif
384
385}/* lcd_gotoxy */
386
387
388/*************************************************************************
389*************************************************************************/
390int lcd_getxy(void)
391{
392 return lcd_waitbusy();
393}
394
395
396/*************************************************************************
397Clear display and set cursor to home position
398*************************************************************************/
399void lcd_clrscr(void)
400{
401 lcd_command(1<<LCD_CLR);
402}
403
404
405/*************************************************************************
406Set cursor to home position
407*************************************************************************/
408void lcd_home(void)
409{
410 lcd_command(1<<LCD_HOME);
411}
412
413
414/*************************************************************************
415Display character at current cursor position
416Input: character to be displayed
417Returns: none
418*************************************************************************/
419void lcd_putc(char c)
420{
421 uint8_t pos;
422
423
424 pos = lcd_waitbusy(); // read busy-flag and address counter
425 if (c=='\n')
426 {
427 lcd_newline(pos);
428 }
429 else
430 {
431#if LCD_WRAP_LINES==1
432#if LCD_LINES==1
433 if ( pos == LCD_START_LINE1+LCD_DISP_LENGTH ) {
434 lcd_write((1<<LCD_DDRAM)+LCD_START_LINE1,0);
435 }
436#elif LCD_LINES==2
437 if ( pos == LCD_START_LINE1+LCD_DISP_LENGTH ) {
438 lcd_write((1<<LCD_DDRAM)+LCD_START_LINE2,0);
439 }else if ( pos == LCD_START_LINE2+LCD_DISP_LENGTH ){
440 lcd_write((1<<LCD_DDRAM)+LCD_START_LINE1,0);
441 }
442#elif LCD_LINES==4
443 if ( pos == LCD_START_LINE1+LCD_DISP_LENGTH ) {
444 lcd_write((1<<LCD_DDRAM)+LCD_START_LINE2,0);
445 }else if ( pos == LCD_START_LINE2+LCD_DISP_LENGTH ) {
446 lcd_write((1<<LCD_DDRAM)+LCD_START_LINE3,0);
447 }else if ( pos == LCD_START_LINE3+LCD_DISP_LENGTH ) {
448 lcd_write((1<<LCD_DDRAM)+LCD_START_LINE4,0);
449 }else if ( pos == LCD_START_LINE4+LCD_DISP_LENGTH ) {
450 lcd_write((1<<LCD_DDRAM)+LCD_START_LINE1,0);
451 }
452#endif
453 lcd_waitbusy();
454#endif
455 lcd_write(c, 1);
456 }
457
458}/* lcd_putc */
459
460
461/*************************************************************************
462Display string without auto linefeed
463Input: string to be displayed
464Returns: none
465*************************************************************************/
466void lcd_puts(const char *s)
467/* print string on lcd (no auto linefeed) */
468{
469 register char c;
470
471 while ( (c = *s++) ) {
472 lcd_putc(c);
473 }
474
475}/* lcd_puts */
476
477
478/*************************************************************************
479Display string from program memory without auto linefeed
480Input: string from program memory be be displayed
481Returns: none
482*************************************************************************/
483void lcd_puts_p(const char *progmem_s)
484/* print string from program memory on lcd (no auto linefeed) */
485{
486 register char c;
487
488 while ( (c = pgm_read_byte(progmem_s++)) ) {
489 lcd_putc(c);
490 }
491
492}/* lcd_puts_p */
493
494
495/*************************************************************************
496Initialize display and select type of cursor
497Input: dispAttr LCD_DISP_OFF display off
498 LCD_DISP_ON display on, cursor off
499 LCD_DISP_ON_CURSOR display on, cursor on
500 LCD_DISP_CURSOR_BLINK display on, cursor on flashing
501Returns: none
502*************************************************************************/
503void lcd_init(uint8_t dispAttr)
504{
505#if LCD_IO_MODE
506 /*
507 * Initialize LCD to 4 bit I/O mode
508 */
509
510 if ( ( &LCD_DATA0_PORT == &LCD_DATA1_PORT) && ( &LCD_DATA1_PORT == &LCD_DATA2_PORT ) && ( &LCD_DATA2_PORT == &LCD_DATA3_PORT )
511 && ( &LCD_RS_PORT == &LCD_DATA0_PORT) && ( &LCD_RW_PORT == &LCD_DATA0_PORT) && (&LCD_E_PORT == &LCD_DATA0_PORT)
512 && (LCD_DATA0_PIN == 0 ) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)
513 && (LCD_RS_PIN == 4 ) && (LCD_RW_PIN == 5) && (LCD_E_PIN == 6 ) )
514 {
515 /* configure all port bits as output (all LCD lines on same port) */
516 DDR(LCD_DATA0_PORT) |= 0x7F;
517 }
518 else if ( ( &LCD_DATA0_PORT == &LCD_DATA1_PORT) && ( &LCD_DATA1_PORT == &LCD_DATA2_PORT ) && ( &LCD_DATA2_PORT == &LCD_DATA3_PORT )
519 && (LCD_DATA0_PIN == 0 ) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3) )
520 {
521 /* configure all port bits as output (all LCD data lines on same port, but control lines on different ports) */
522 DDR(LCD_DATA0_PORT) |= 0x0F;
523 DDR(LCD_RS_PORT) |= _BV(LCD_RS_PIN);
524 DDR(LCD_RW_PORT) |= _BV(LCD_RW_PIN);
525 DDR(LCD_E_PORT) |= _BV(LCD_E_PIN);
526 }
527 else
528 {
529 /* configure all port bits as output (LCD data and control lines on different ports */
530 DDR(LCD_RS_PORT) |= _BV(LCD_RS_PIN);
531 DDR(LCD_RW_PORT) |= _BV(LCD_RW_PIN);
532 DDR(LCD_E_PORT) |= _BV(LCD_E_PIN);
533 DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN);
534 DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN);
535 DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN);
536 DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN);
537 }
538 delay(LCD_DELAY_BOOTUP); /* wait 16ms or more after power-on */
539
540 /* initial write to lcd is 8bit */
541 LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN); // LCD_FUNCTION>>4;
542 LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN); // LCD_FUNCTION_8BIT>>4;
543 lcd_e_toggle();
544 delay(LCD_DELAY_INIT); /* delay, busy flag can't be checked here */
545
546 /* repeat last command */
547 lcd_e_toggle();
548 delay(LCD_DELAY_INIT_REP); /* delay, busy flag can't be checked here */
549
550 /* repeat last command a third time */
551 lcd_e_toggle();
552 delay(LCD_DELAY_INIT_REP); /* delay, busy flag can't be checked here */
553
554 /* now configure for 4bit mode */
555 LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN); // LCD_FUNCTION_4BIT_1LINE>>4
556 lcd_e_toggle();
557 delay(LCD_DELAY_INIT_4BIT); /* some displays need this additional delay */
558
559 /* from now the LCD only accepts 4 bit I/O, we can use lcd_command() */
560#else
561 /*
562 * Initialize LCD to 8 bit memory mapped mode
563 */
564
565 /* enable external SRAM (memory mapped lcd) and one wait state */
566 MCUCR = _BV(SRE) | _BV(SRW);
567
568 /* reset LCD */
569 delay(LCD_DELAY_BOOTUP); /* wait 16ms after power-on */
570 lcd_write(LCD_FUNCTION_8BIT_1LINE,0); /* function set: 8bit interface */
571 delay(LCD_DELAY_INIT); /* wait 5ms */
572 lcd_write(LCD_FUNCTION_8BIT_1LINE,0); /* function set: 8bit interface */
573 delay(LCD_DELAY_INIT_REP); /* wait 64us */
574 lcd_write(LCD_FUNCTION_8BIT_1LINE,0); /* function set: 8bit interface */
575 delay(LCD_DELAY_INIT_REP); /* wait 64us */
576#endif
577
578#if KS0073_4LINES_MODE
579 /* Display with KS0073 controller requires special commands for enabling 4 line mode */
580 lcd_command(KS0073_EXTENDED_FUNCTION_REGISTER_ON);
581 lcd_command(KS0073_4LINES_MODE);
582 lcd_command(KS0073_EXTENDED_FUNCTION_REGISTER_OFF);
583#else
584 lcd_command(LCD_FUNCTION_DEFAULT); /* function set: display lines */
585#endif
586 lcd_command(LCD_DISP_OFF); /* display off */
587 lcd_clrscr(); /* display clear */
588 lcd_command(LCD_MODE_DEFAULT); /* set entry mode */
589 lcd_command(dispAttr); /* display/cursor control */
590
591}/* lcd_init */
592
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