drv_LCDTerm.c

/* $Id$
 * $URL$
 *
 * driver for the LCDTerm serial-to-HD44780 adapter boards
 * http://www.bobblick.com/techref/projects/lcdterm/lcdterm.html
 *
 * Copyright (C) 2005 Michael Reinelt <michael@reinelt.co.at>
 * 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.
 *
 */

/* 
 *
 * exported fuctions:
 *
 * struct DRIVER drv_LCDTerm
 *
 */

#include "config.h"

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

#define LCD_CLEAR 0x03
#define LCD_CMD   0x12
#define LCD_DATA  0x14

static char Name[] = "LCDTerm";


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

static void drv_LT_clear(void)
{
    char cmd[1];

    cmd[0] = LCD_CLEAR;		/* clear display */
    drv_generic_serial_write(cmd, 1);	/* clear screen */
}


static int drv_LT_send(const char request, const char value)
{
    char buf[2];

    buf[0] = request;
    buf[1] = value;
    drv_generic_serial_write(buf, 2);

    return 0;
}


static void drv_LT_command(const char cmd)
{
    drv_LT_send(LCD_CMD, cmd);
}


static void drv_LT_write(const int row, const int col, const char *data, int len)
{
    int pos;

    /* 16x4 Displays use a slightly different layout */
    if (DCOLS == 16 && DROWS == 4) {
	pos = (row % 2) * 64 + (row / 2) * 16 + col;
    } else {
	pos = (row % 2) * 64 + (row / 2) * 20 + col;
    }

    drv_LT_command(0x80 | pos);

    while (len--) {
	drv_LT_send(LCD_DATA, *data++);
    }
}

static void drv_LT_defchar(const int ascii, const unsigned char *matrix)
{
    int i;

    drv_LT_command(0x40 | 8 * ascii);

    for (i = 0; i < 8; i++) {
	drv_LT_send(LCD_DATA, *matrix++ & 0x1f);
    }
}


static int drv_LT_start(const char *section, const int quiet)
{
    int rows = -1, cols = -1;
    char *s;

    if (drv_generic_serial_open(section, Name, 0) < 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;

    /* initialize display */
    drv_LT_command(0x29);	/* 8 Bit mode, 1/16 duty cycle, 5x8 font */
    drv_LT_command(0x08);	/* Display off, cursor off, blink off */
    drv_LT_command(0x0c);	/* Display on, cursor off, blink off */
    drv_LT_command(0x06);	/* curser moves to right, no shift */

    drv_LT_clear();		/* clear display */

    if (!quiet) {
	char buffer[40];
	qprintf(buffer, sizeof(buffer), "%s %dx%d", Name, DCOLS, DROWS);
	if (drv_generic_text_greet(buffer, "www.bwct.de")) {
	    sleep(3);
	    drv_LT_clear();
	}
    }

    return 0;
}


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

/* none */


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


/* using drv_generic_text_draw(W) */
/* using drv_generic_text_icon_draw(W) */
/* using drv_generic_text_bar_draw(W) */


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


/* list models */
int drv_LT_list(void)
{
    printf("LCDTerm serial-to-HD44780 adapter board");
    return 0;
}


/* initialize driver & display */
int drv_LT_init(const char *section, const int quiet)
{
    WIDGET_CLASS wc;
    int asc255bug;
    int ret;

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

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

    /* Fixme: */
    GOTO_COST = 2;		/* number of bytes a goto command requires */

    /* real worker functions */
    drv_generic_text_real_write = drv_LT_write;
    drv_generic_text_real_defchar = drv_LT_defchar;


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

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

    /* initialize generic icon driver */
    if ((ret = drv_generic_text_icon_init()) != 0)
	return ret;

    /* initialize generic bar driver */
    if ((ret = drv_generic_text_bar_init(0)) != 0)
	return ret;

    /* add fixed chars to the bar driver */
    /* most displays have a full block on ascii 255, but some have kind of  */
    /* an 'inverted P'. If you specify 'asc255bug 1 in the config, this */
    /* char will not be used, but rendered by the bar driver */
    cfg_number(section, "asc255bug", 0, 0, 1, &asc255bug);
    drv_generic_text_bar_add_segment(0, 0, 255, 32);	/* ASCII  32 = blank */
    if (!asc255bug)
	drv_generic_text_bar_add_segment(255, 255, 255, 255);	/* ASCII 255 = block */

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

    /* register icon widget */
    wc = Widget_Icon;
    wc.draw = drv_generic_text_icon_draw;
    widget_register(&wc);

    /* register bar widget */
    wc = Widget_Bar;
    wc.draw = drv_generic_text_bar_draw;
    widget_register(&wc);

    /* register plugins */
    /* none */

    return 0;
}


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

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

    drv_generic_text_quit();

    /* clear display */
    drv_LT_clear();

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

    drv_generic_serial_close();

    return (0);
}


DRIVER drv_LCDTerm = {
    .name = Name,
    .list = drv_LT_list,
    .init = drv_LT_init,
    .quit = drv_LT_quit,
};