sin.c

嵌入式linux下液晶编程院代码, 可以在LINUX2.4内核下运行

/* $Id: SIN.c,v 1.13 2003/09/13 06:45:43 reinelt Exp $
 *
 * driver for SIN router displays
 *
 * Copyright 2000 by Michael Reinelt ([e-mail])
 *
 * This program 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.
 *
 * This program 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.
 *
 *
 * $Log: SIN.c,v $
 * Revision 1.13  2003/09/13 06:45:43  reinelt
 * icons for all remaining drivers
 *
 * Revision 1.12  2003/08/24 05:17:58  reinelt
 * liblcd4linux patch from Patrick Schemitz
 *
 * Revision 1.11  2003/08/17 12:11:58  reinelt
 * framework for icons prepared
 *
 * Revision 1.10  2003/08/17 08:25:30  reinelt
 * preparations for liblcd4linux; minor bugs in SIN.c and Skeleton.c
 *
 * Revision 1.9  2003/07/24 04:48:09  reinelt
 * 'soft clear' needed for virtual rows
 *
 * Revision 1.8  2003/02/22 07:53:10  reinelt
 * cfg_get(key,defval)
 *
 * Revision 1.7  2001/04/27 05:04:57  reinelt
 *
 * replaced OPEN_MAX with sysconf()
 * replaced mktemp() with mkstemp()
 * unlock serial port if open() fails
 *
 * Revision 1.6  2001/02/13 09:00:13  reinelt
 *
 * prepared framework for GPO's (general purpose outputs)
 *
 * Revision 1.5  2000/12/07 20:47:54  reinelt
 *
 * first try for SIN bars
 *
 * Revision 1.4  2000/12/01 20:42:37  reinelt
 *
 * added debugging of SIN driver output, probably found the positioning bug (format %02x instead of %2x)
 *
 * Revision 1.3  2000/12/01 07:20:26  reinelt
 *
 * modified text positioning: row starts with 0, column is hexadecimal
 *
 * Revision 1.2  2000/11/28 17:27:19  reinelt
 *
 * changed decimal values for screen, row, column to ascii values (shame on you!)
 *
 * Revision 1.1  2000/11/28 16:46:11  reinelt
 *
 * first try to support display of SIN router
 *
 *
 */

/* 
 *
 * exported fuctions:
 *
 * struct LCD SIN[] *
 */

#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>

#include "debug.h"
#include "cfg.h"
#include "lock.h"
#include "display.h"
#include "bar.h"

// FIXME: 6x8
#define XRES 1
#define YRES 1


static LCD Lcd;
static char *Port=NULL;
static int Device=-1;

static char Txt[8][40];

static int SIN_open (void)
{
  int fd;
  pid_t pid;
  struct termios portset;
  
  if ((pid=lock_port(Port))!=0) {
    if (pid==-1)
      error ("SIN: port %s could not be locked", Port);
    else
      error ("SIN: port %s is locked by process %d", Port, pid);
    return -1;
  }
  fd = open(Port, O_RDWR | O_NOCTTY | O_NDELAY); 
  if (fd==-1) {
    error ("SIN: open(%s) failed: %s", Port, strerror(errno));
    unlock_port(Port);
    return -1;
  }
  if (tcgetattr(fd, &portset)==-1) {
    error ("SIN: tcgetattr(%s) failed: %s", Port, strerror(errno));
    unlock_port(Port);
    return -1;
  }
  cfmakeraw(&portset);
  cfsetospeed(&portset, B9600);
  if (tcsetattr(fd, TCSANOW, &portset)==-1) {
    error ("SIN: tcsetattr(%s) failed: %s", Port, strerror(errno));
    unlock_port(Port);
    return -1;
  }
  return fd;
}

static void SIN_debug (char *string, int len)
{
  char buffer[256];
  char *p, *c;
  
  p=buffer;
  c=string;
  while (len-->0) {
    if (isprint(*c)) {
      *p++=*c;
    } else {
      p+=sprintf(p, "\\%02x", *c);
    }
    c++;
  }
  *p='\0';
  debug ("sending '%s'", buffer);
}

static void SIN_write (char *string, int len)
{
  SIN_debug(string, len);
  if (Device==-1) return;
  if (write (Device, string, len)==-1) {
    if (errno==EAGAIN) {
      usleep(1000);
      if (write (Device, string, len)>=0) return;
    }
    error ("SIN: write(%s) failed: %s", Port, strerror(errno));
  }
}

int SIN_clear (int full)
{
  int row, col;

  for (row=0; row<Lcd.rows; row++) {
    for (col=0; col<Lcd.cols; col++) {
      Txt[row][col]='\t';
    }
  }
  
  if (full)
    SIN_write ("\033 ",2);
  
  return 0;
}

int SIN_init (LCD *Self)
{
  char *port;

  Lcd=*Self;

  if (Port) {
    free (Port);
    Port=NULL;
  }

  port=cfg_get ("Port",NULL);
  if (port==NULL || *port=='\0') {
    error ("SIN: no 'Port' entry in %s", cfg_source());
    return -1;
  }
  Port=strdup(port);

  debug ("using port %s at 9600 baud", Port);

  Device=SIN_open();
  if (Device==-1) return -1;

  SIN_write ("\015", 1);  // send 'Enter'
  // Fixme: should we read the identifier here....
  SIN_write ("\033S0", 3); // select screen #0
  sleep (1); // FIXME: handshaking
  SIN_clear(1);

  return 0;
}

int SIN_put (int row, int col, char *text)
{
  char *p=&Txt[row][col];
  char *t=text;
  
  while (*t && col++<=Lcd.cols) {
    *p++=*t++;
  }
  return 0;
}

int SIN_bar (int type, int row, int col, int max, int len, int dummy)
{
  int rev=0;
  
  if (len<1) len=1;
  else if (len>max) len=max;
  
  switch (type) {
  case BAR_L:
    len=max-len;
    rev=1;
    
  case BAR_R:
    while (max>0 && col<=Lcd.cols) {
      if (len>=XRES) {
	Txt[row][col]=rev?0x19:0x18;
	len-=XRES;
      } else {
	Txt[row][col]=rev?0x18:0x19;
	len=0;
      }
      max-=XRES;
      col++;
    }
    break;
  }
  return 0;
}

int SIN_flush (void)
{
  char buffer[256]="\015\033T"; // place text
  char *p;
  int  row, col;
  
  for (row=0; row<Lcd.rows; row++) {
    buffer[3]='0'+row;
    for (col=0; col<Lcd.cols; col++) {
      if (Txt[row][col]=='\t') continue;
      sprintf (buffer+4, "%02x", col);
      for (p=buffer+6; col<Lcd.cols; col++, p++) {
	if (Txt[row][col]=='\t') break;
	*p=Txt[row][col];
      }
      SIN_write (buffer, p-buffer);
    }
  }
  return 0;
}

int SIN_quit (void)
{
  debug ("closing port %s", Port);
  close (Device);
  unlock_port(Port);
  return (0);
}

LCD SIN[] = {
  { name: "SIN",
    rows:  8,
    cols:  40,
    xres:  XRES,
    yres:  YRES,
    bars:  BAR_L | BAR_R,
    icons: 0,
    gpos:  0,
    init:  SIN_init,
    clear: SIN_clear,
    put:   SIN_put,
    bar:   SIN_bar,
    icon:  NULL,
    gpo:   NULL,
    flush: SIN_flush,
    quit:  SIN_quit },
  { NULL }
};