mirror of
https://github.com/netfun2000/lcd4linux.git
synced 2026-02-27 09:44:34 +08:00
[lcd4linux @ 2005-02-24 07:06:45 by reinelt]
SimpleLCD driver added git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@515 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
This commit is contained in:
reinelt
265
drv_SimpleLCD.c
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265
drv_SimpleLCD.c
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/* $Id: drv_SimpleLCD.c,v 1.1 2005/02/24 07:06:48 reinelt Exp $
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*
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* driver for a simple serial terminal.
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* This driver simply send out caracters on the serial port, without any
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* formatting instructions for a particular LCD device.
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* This is useful for custom boards of for very simple LCD.
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*
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* I use it for tests on a custom-made board based on a AVR microcontroler
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* and also for driver a Point-of-Sale text-only display.
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* I assume the following :
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* - CR (0x0d) Return to the begining of the line without erasing,
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* - LF (0x0a) Initiate a new line (but without sending the cursor to
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* the begining of the line)
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* - BS (0x08) Erase the previous caracter on the line.
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* - It's not possible to return to the first line. Thus a back buffer is used
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* in this driver.
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*
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* The code come mostly taken from the LCDTerm driver in LCD4Linux, from
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* Michaels Reinelt, many thanks to him.
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*
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* This driver is released under the GPL.
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*
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* Copyright (C) 2005 Julien Aube <ob@obconseil.net>
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* Copyright (C) 2005 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
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*
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* This file is part of LCD4Linux.
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*
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* LCD4Linux is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* LCD4Linux is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Log: drv_SimpleLCD.c,v $
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* Revision 1.1 2005/02/24 07:06:48 reinelt
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* SimpleLCD driver added
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*
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*/
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/*
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*
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* exported fuctions:
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*
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* struct DRIVER drv_SimpleLCD
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*
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include "debug.h"
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#include "cfg.h"
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#include "qprintf.h"
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#include "plugin.h"
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#include "widget.h"
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#include "widget_text.h"
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#include "widget_icon.h"
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#include "widget_bar.h"
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#include "drv.h"
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#include "drv_generic_text.h"
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#include "drv_generic_serial.h"
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static char Name[]="SimpleLCD";
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static char *backbuffer=0;
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static int backbuffer_size=0;
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/****************************************/
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/*** hardware dependant functions ***/
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/****************************************/
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/** No clear function on SimpleLCD : Just send CR-LF * number of lines **/
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static void drv_SL_clear (void)
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{
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char cmd[2] = { '\r', '\n' };
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int i;
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for (i=0;i<DROWS;++i) {
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drv_generic_serial_write (cmd, 2);
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}
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memset(backbuffer,' ',backbuffer_size);
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}
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/* If full_commit = true, then the whole buffer is to be sent to screen.
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if full_commit = false, then only the last line is to be sent (faster on slow screens)
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*/
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static void drv_SL_commit(int full_commit)
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{
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int row;
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char cmd[2] = { '\r', '\n' };
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if (full_commit) {
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for (row=0;row < DROWS; row++) {
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drv_generic_serial_write (cmd, 2);
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drv_generic_serial_write(backbuffer+(DCOLS*row),DCOLS);
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}
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} else {
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drv_generic_serial_write (cmd, 1); /* Go to the beginning of the line only */
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drv_generic_serial_write(backbuffer+(DCOLS*(DROWS-1)),DCOLS);
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}
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}
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static void drv_SL_write (const int row, const int col, const char *data, int len)
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{
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memcpy(backbuffer+(row*DCOLS)+col,data,len);
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if (row == DROWS-1)
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drv_SL_commit(0);
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else
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drv_SL_commit(1);
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}
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static int drv_SL_start (const char *section, const int quiet)
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{
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int rows=-1, cols=-1;
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unsigned int flags=0;
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char *s;
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cfg_number(section,"Options",0,0,0xffff,&flags);
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if (drv_generic_serial_open(section, Name, flags) < 0) return -1;
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s=cfg_get(section, "Size", NULL);
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if (s==NULL || *s=='\0') {
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error ("%s: no '%s.Size' entry from %s", Name, section, cfg_source());
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return -1;
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}
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if (sscanf(s,"%dx%d",&cols,&rows)!=2 || rows<1 || cols<1) {
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error ("%s: bad %s.Size '%s' from %s", Name, section, s, cfg_source());
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free (s);
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return -1;
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}
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DROWS = rows;
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DCOLS = cols;
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backbuffer_size = DROWS * DCOLS;
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backbuffer = malloc(backbuffer_size);
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if ( ! backbuffer ){
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return -1;
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}
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drv_SL_clear(); /* clear */
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if (!quiet) {
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char buffer[40];
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qprintf(buffer, sizeof(buffer), "%s %dx%d", Name, DCOLS, DROWS);
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if (drv_generic_text_greet (buffer, NULL)) {
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sleep (3);
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drv_SL_clear();
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}
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}
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return 0;
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}
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/****************************************/
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/*** plugins ***/
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/****************************************/
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/* none */
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/****************************************/
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/*** widget callbacks ***/
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/****************************************/
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/* using drv_generic_text_draw(W) */
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/****************************************/
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/*** exported functions ***/
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/****************************************/
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/* list models */
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int drv_SL_list (void)
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{
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printf ("generic");
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return 0;
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}
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/* initialize driver & display */
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int drv_SL_init (const char *section, const int quiet)
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{
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WIDGET_CLASS wc;
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int ret;
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/* display preferences */
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XRES = 5; /* pixel width of one char */
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YRES = 8; /* pixel height of one char */
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CHARS = 0; /* number of user-defineable characters */
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CHAR0 = 0; /* ASCII of first user-defineable char */
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GOTO_COST = -1; /* number of bytes a goto command requires */
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/* real worker functions */
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drv_generic_text_real_write = drv_SL_write;
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/* start display */
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if ((ret=drv_SL_start (section, quiet))!=0)
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return ret;
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/* initialize generic text driver */
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if ((ret=drv_generic_text_init(section, Name))!=0)
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return ret;
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/* register text widget */
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wc=Widget_Text;
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wc.draw=drv_generic_text_draw;
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widget_register(&wc);
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/* register plugins */
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/* none */
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return 0;
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}
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/* close driver & display */
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int drv_SL_quit (const int quiet)
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{
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info("%s: shutting down.", Name);
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drv_generic_text_quit();
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/* clear display */
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drv_SL_clear();
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/* say goodbye... */
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if (!quiet) {
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drv_generic_text_greet ("goodbye!", NULL);
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}
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drv_generic_serial_close();
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if ( backbuffer ) {
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free(backbuffer) ; backbuffer=0; backbuffer_size=0;
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}
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return (0);
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}
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DRIVER drv_SimpleLCD = {
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name: Name,
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list: drv_SL_list,
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init: drv_SL_init,
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quit: drv_SL_quit,
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};
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