aboutsummaryrefslogtreecommitdiffstats
path: root/drv_SimpleLCD.c
blob: 482b67af5eee818a212b5967b34b6e25dc8740a4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
/* $Id$
 * $URL$
 * 
 * driver for a simple serial terminal.
 * 
 * Copyright (C) 2005 Julien Aube <ob@obconseil.net>
 * Copyright (C) 2005 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
 *
 * This file is part of LCD4Linux.
 *
 * LCD4Linux is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * LCD4Linux is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

/*
 * This driver simply send out caracters on the serial port, without any 
 * formatting instructions for a particular LCD device. 
 * This is useful for custom boards of for very simple LCD.
 *
 * I use it for tests on a custom-made board based on a AVR microcontroler
 * and also for driver a Point-of-Sale text-only display.
 * I assume the following :
 * - CR (0x0d) Return to the begining of the line without erasing,
 * - LF (0x0a) Initiate a new line (but without sending the cursor to 
 * the begining of the line)
 * - BS (0x08) Move the cursor to the previous caracter (but does no erase it).
 * - It's not possible to return to the first line. Thus a back buffer is used
 * in this driver.
 * 
 * ******** UPDATE *********
 * I have added a "VT-100 Compatible mode" that allows the driver to support
 * control-sequence code. This greatly reduce flickering and eliminate the need
 * for the back-buffer. But it is optional since all displays cannot support them.
 * Here are the codes:
 * Delete the display (but does not move the cursor) : 
 *    "ESC [ 2 J"     (0x1b 0x5b 0x32 0x4a)
 * Position the cursor :
 *    "ESC [ YY ; XX H" ( 0x1b 0x5b YY 0x3b XX 0x48 ) where YY is the ascii for the line 
 *    number, and XX is the ascii for the column number ( first line/column is '1', not zero)
 * Delete to the end of line from current cursor position :
 *    "ESC [ 0 K" ( 0x1b 0x5b 0x30 0x4b )
 * Set Country Code : 
 *    "ESC R NN"  (0x1b 0x52 NN) where NN is the country code *in byte, NOT ascii*.
 *    The default is 0 (USA), see below for specific countries. 
 *    the list of accessible characters page are available on this page : 
 *    http://www.wincor-nixdorf.com/internet/com/Services/Support/TechnicalSupport/POSSystems
 *    /Manuals/BAxx/index.html
 * Get the display identification : (Doesn't work reliably, timing issues here)
 *    "ESC [ 0 c" ( 0x1b 0x5b 0x30 0x63). Return a string which look like this : 
 *  ESC [ ? M ; NN ; OO ; PP ; QQ c) where M is type of display (2 for VFD),
 *  NN is the rom version, 00 is the current caracter set, PP is the number of lines and 
 *  QQ the number of colomns.  
 * 
 *
 * A "bar" capability is now provided if the config file has a "BarCharValue" parameter in it.
 *
 * The code come mostly taken from the LCDTerm driver in LCD4Linux, from 
 * Michaels Reinelt, many thanks to him.
 *
 * This driver is released under the GPL.
 */

/* 
 *
 * exported fuctions:
 *
 * struct DRIVER drv_SimpleLCD
 *
 */

#include "config.h"

#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#include "debug.h"
#include "cfg.h"
#include "qprintf.h"
#include "plugin.h"
#include "widget.h"
#include "widget_text.h"
#include "widget_icon.h"
#include "widget_bar.h"
#include "drv.h"
#include "drv_generic_text.h"
#include "drv_generic_serial.h"


static char Name[] = "SimpleLCD";
static char *backbuffer = 0;
static int backbuffer_size = 0;
static int vt100_mode = 0;
static unsigned char bar_char = 0;

/****************************************/
/***  hardware dependant functions    ***/
/****************************************/

/** No clear function on SimpleLCD : Just send CR-LF * number of lines **/
static void drv_SL_simple_clear(void)
{
    char cmd[2];
    int i;
    cmd[0] = '\r';
    cmd[1] = '\n';
    for (i = 0; i < DROWS; ++i) {
	drv_generic_serial_write(cmd, 2);
    }
    memset(backbuffer, ' ', backbuffer_size);
}

/** vt-100 mode : send the ESC-code **/
static void drv_SL_vt100_clear(void)
{
    char cmd[4];
    cmd[0] = 0x1b;
    cmd[1] = '[';
    cmd[2] = '2';
    cmd[3] = 'J';
    drv_generic_serial_write(cmd, 4);

}

static void drv_SL_clear(void)
{
    vt100_mode == 1 ? drv_SL_vt100_clear() : drv_SL_simple_clear();
}


/* If full_commit = true, then the whole buffer is to be sent to screen.
   if full_commit = false, then only the last line is to be sent (faster on slow screens)
*/

static void drv_SL_commit(int full_commit)
{
    int row;
    char cmd[2] = { '\r', '\n' };
    if (full_commit) {
	for (row = 0; row < DROWS; row++) {
	    drv_generic_serial_write(cmd, 2);
	    drv_generic_serial_write(backbuffer + (DCOLS * row), DCOLS);
	}
    } else {
	drv_generic_serial_write(cmd, 1);	/* Go to the beginning of the line only */
	drv_generic_serial_write(backbuffer + (DCOLS * (DROWS - 1)), DCOLS);
    }
}

static void drv_SL_simple_write(const int row, const int col, const char *data, int len)
{
    memcpy(backbuffer + (row * DCOLS) + col, data, len);
    if (row == DROWS - 1)
	drv_SL_commit(0);
    else
	drv_SL_commit(1);
}

static void drv_SL_vt100_write(const int row, const int col, const char *data, int len)
{
    char cmd[8];
    cmd[0] = 0x1b;
    cmd[1] = '[';
    cmd[2] = row + '1';
    cmd[3] = ';';
    cmd[4] = (col / 10) + '0';
    cmd[5] = (col % 10) + '1';
    cmd[6] = 'H';
    drv_generic_serial_write(cmd, 7);
    drv_generic_serial_write(data, len);
}


static int drv_SL_start(const char *section, const int quiet)
{
    int rows = -1, cols = -1;
    int value;
    unsigned int flags = 0;
    char *s;
    char *model = 0;

    vt100_mode = 0;
    model = cfg_get(section, "Model", "generic");
    if (model != NULL && *model != '\0') {
	if (strcasecmp("vt100", model) == 0)
	    vt100_mode = 1;
    }

    cfg_number(section, "BarCharValue", 0, 0, 255, &value);
    bar_char = value;
    cfg_number(section, "Options", 0, 0, 0xffff, &value);
    flags = value;
    if (drv_generic_serial_open(section, Name, flags) < 0)
	return -1;

    s = cfg_get(section, "Size", NULL);
    if (s == NULL || *s == '\0') {
	error("%s: no '%s.Size' entry from %s", Name, section, cfg_source());
	return -1;
    }
    if (sscanf(s, "%dx%d", &cols, &rows) != 2 || rows < 1 || cols < 1) {
	error("%s: bad %s.Size '%s' from %s", Name, section, s, cfg_source());
	free(s);
	return -1;
    }

    DROWS = rows;
    DCOLS = cols;

    if (!vt100_mode) {
	backbuffer_size = DROWS * DCOLS;
	backbuffer = malloc(backbuffer_size);
	if (!backbuffer) {
	    return -1;
	}
    }

    /* real worker functions */
    if (vt100_mode) {
	drv_generic_text_real_write = drv_SL_vt100_write;
    } else {
	drv_generic_text_real_write = drv_SL_simple_write;
    }

    drv_SL_clear();		/* clear */


    if (!quiet) {
	char buffer[40];
	qprintf(buffer, sizeof(buffer), "%s %dx%d", Name, DCOLS, DROWS);
	if (drv_generic_text_greet(buffer, NULL)) {
	    sleep(3);
	    drv_SL_clear();
	}
    }

    return 0;
}


/****************************************/
/***            plugins               ***/
/****************************************/

/* none */


/****************************************/
/***        widget callbacks          ***/
/****************************************/


/* using drv_generic_text_draw(W) */


/****************************************/
/***        exported functions        ***/
/****************************************/


/* list models */
int drv_SL_list(void)
{
    printf("generic vt100");
    return 0;
}


/* initialize driver & display */
int drv_SL_init(const char *section, const int quiet)
{
    WIDGET_CLASS wc;
    int ret;

    info("%s: %s", Name, "$Rev$");

    /* display preferences */
    XRES = 5;			/* pixel width of one char  */
    YRES = 8;			/* pixel height of one char  */
    CHARS = 0;			/* number of user-defineable characters */
    CHAR0 = 0;			/* ASCII of first user-defineable char */

    GOTO_COST = -1;		/* number of bytes a goto command requires */


    /* start display */
    if ((ret = drv_SL_start(section, quiet)) != 0)
	return ret;

    /* initialize generic text driver */
    if ((ret = drv_generic_text_init(section, Name)) != 0)
	return ret;

    /* register text widget */
    wc = Widget_Text;
    wc.draw = drv_generic_text_draw;
    widget_register(&wc);

    /* register plugins */
    /* none */

    return 0;
}


/* close driver & display */
int drv_SL_quit(const int quiet)
{

    info("%s: shutting down.", Name);

    drv_generic_text_quit();

    /* clear display */
    drv_SL_clear();

    /* say goodbye... */
    if (!quiet) {
	drv_generic_text_greet("goodbye!", NULL);
    }

    drv_generic_serial_close();

    if (backbuffer) {
	free(backbuffer);
	backbuffer = 0;
	backbuffer_size = 0;
    }
    return (0);
}


DRIVER drv_SimpleLCD = {
    .name = Name,
    .list = drv_SL_list,
    .init = drv_SL_init,
    .quit = drv_SL_quit,
};