From 011dae42e1add1f09fafec9125077afd38a9a837 Mon Sep 17 00:00:00 2001
From: reinelt <>
Date: Sat, 17 Aug 2002 13:10:23 +0000
Subject: [lcd4linux @ 2002-08-17 13:10:22 by reinelt] USBLCD driver added

---
 USBLCD.c | 542 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 542 insertions(+)
 create mode 100644 USBLCD.c

(limited to 'USBLCD.c')

diff --git a/USBLCD.c b/USBLCD.c
new file mode 100644
index 0000000..d559741
--- /dev/null
+++ b/USBLCD.c
@@ -0,0 +1,542 @@
+/* $Id: USBLCD.c,v 1.1 2002/08/17 13:10:22 reinelt Exp $
+ *
+ * Driver for USBLCD ( see http://www.usblcd.de )
+ * This Driver is based on HD44780.c
+ *
+ * Copyright 2002 by Robin Adams, Adams IT Services ( info@usblcd.de )
+ * Copyright 1999, 2000 by Michael Reinelt (reinelt@eunet.at)
+ *
+ * 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.
+ *
+ *
+ * Revision 1.0  2002/07/08 12:16:10  radams
+ *
+ * first version of the USBLCD driver
+ *
+ */
+
+/* 
+ *
+ * exported fuctions:
+ *
+ * struct LCD UDBLCD[]
+ *
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <time.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+
+#include "debug.h"
+#include "cfg.h"
+#include "display.h"
+#include "udelay.h"
+
+#define GET_HARD_VERSION	1
+#define GET_DRV_VERSION		2
+
+#define XRES 5
+#define YRES 8
+#define CHARS 8
+#define BARS ( BAR_L | BAR_R | BAR_U | BAR_D | BAR_H2 )
+
+typedef struct {
+  int len1;
+  int len2;
+  int type;
+  int segment;
+} BAR;
+
+typedef struct {
+  int len1;
+  int len2;
+  int type;
+  int used;
+  int ascii;
+} SEGMENT;
+
+static LCD Lcd;
+
+int usblcd_file;
+
+static char *Port=NULL;
+
+
+static char Txt[4][40];
+static BAR  Bar[4][40];
+
+static int nSegment=2;
+static SEGMENT Segment[128] = {{ len1:0,   len2:0,   type:255, used:0, ascii:32 },
+			       { len1:255, len2:255, type:255, used:0, ascii:255 }};
+
+
+static void USBLCD_command (unsigned char cmd, int delay)
+{
+
+    {
+      char a=0; 
+      write(usblcd_file,&a,1);
+      write(usblcd_file,&cmd,1);
+    }
+}
+
+static void USBLCD_write (char *string, int len, int delay)
+{
+    {
+      char a;
+      while (len--) {
+        a=*string++;
+    
+        if(a==0) write(usblcd_file,&a,1);
+        write(usblcd_file,&a,1);
+      }
+    }
+}
+
+
+static int USBLCD_open (void)
+{
+  char buf[128];
+  int major,minor;
+
+  usblcd_file=open(Port,O_WRONLY);
+  if (usblcd_file==-1) {
+    error ("USBLCD: open(%s) failed: %s", Port, strerror(errno));
+    return -1;
+  }
+
+  memset(buf,0,128);
+
+  if( ioctl(usblcd_file,GET_DRV_VERSION, buf)!=0) {
+      error ("IOCTL failed, could not get Driver Version!\n");
+      return -2;
+  } ;
+
+  debug("Driver Version: %s\n",buf);
+
+  if( sscanf(buf,"USBLCD Driver Version %d.%d",&major,&minor)!=2) {
+    error("Could not read Driver Version!\n");
+    return -4;
+  };
+ 
+  if(major!=1) {
+    error("Driver Version not supported!\n");
+    return -4;
+  }
+
+  memset(buf,0,128);
+
+  if( ioctl(usblcd_file,GET_HARD_VERSION, buf)!=0) {
+      error ("IOCTL failed, could not get Hardware Version!\n");
+      return -3;
+  } ;
+
+  debug("Hardware Version: %s\n\n",buf);
+
+  if( sscanf(buf,"%d.%d",&major,&minor)!=2) {
+    error("Could not read Hardware Version!\n");
+    return -4;
+  };
+
+  if(major!=1) {
+    error("Hardware Version not supported!\n");
+    return -4;
+  }
+
+  USBLCD_command (0x29, 40);   // 8 Bit mode, 1/16 duty cycle, 5x8 font
+  USBLCD_command (0x08, 40);   // Display off, cursor off, blink off
+  USBLCD_command (0x0c, 1640); // Display on, cursor off, blink off, wait 1.64 ms
+  USBLCD_command (0x06, 40);   // curser moves to right, no shift
+
+  return 0;
+}
+
+static void USBLCD_process_bars (void)
+{
+  int row, col;
+  int i, j;
+  
+  for (i=2; i<nSegment && Segment[i].used; i++);
+  for (j=i+1; j<nSegment; j++) {
+    if (Segment[j].used)
+      Segment[i++]=Segment[j];
+  }
+  nSegment=i;
+  
+  for (row=0; row<Lcd.rows; row++) {
+    for (col=0; col<Lcd.cols; col++) {
+      if (Bar[row][col].type==0) continue;
+      for (i=0; i<nSegment; i++) {
+	if (Segment[i].type & Bar[row][col].type &&
+	    Segment[i].len1== Bar[row][col].len1 &&
+	    Segment[i].len2== Bar[row][col].len2) break;
+      }
+      if (i==nSegment) {
+	nSegment++;
+	Segment[i].len1=Bar[row][col].len1;
+	Segment[i].len2=Bar[row][col].len2;
+	Segment[i].type=Bar[row][col].type;
+	Segment[i].used=0;
+	Segment[i].ascii=-1;
+      }
+      Bar[row][col].segment=i;
+    }
+  }
+}
+
+static int USBLCD_segment_diff (int i, int j)
+{
+  int RES;
+  int i1, i2, j1, j2;
+  
+  if (i==j) return 65535;
+  if (!(Segment[i].type & Segment[j].type)) return 65535;
+  if (Segment[i].len1==0 && Segment[j].len1!=0) return 65535;
+  if (Segment[i].len2==0 && Segment[j].len2!=0) return 65535;
+  RES=Segment[i].type & BAR_H ? XRES:YRES;
+  if (Segment[i].len1>=RES && Segment[j].len1<RES) return 65535;
+  if (Segment[i].len2>=RES && Segment[j].len2<RES) return 65535;
+  if (Segment[i].len1==Segment[i].len2 && Segment[j].len1!=Segment[j].len2) return 65535;
+
+  i1=Segment[i].len1; if (i1>RES) i1=RES;
+  i2=Segment[i].len2; if (i2>RES) i2=RES;
+  j1=Segment[j].len1; if (j1>RES) i1=RES;
+  j2=Segment[j].len2; if (j2>RES) i2=RES;
+  
+  return (i1-i2)*(i1-i2)+(j1-j2)*(j1-j2);
+}
+
+static void USBLCD_compact_bars (void)
+{
+  int i, j, r, c, min;
+  int pack_i, pack_j;
+  int pass1=1;
+  int deviation[nSegment][nSegment];
+  
+  if (nSegment>CHARS+2) {
+
+    for (i=2; i<nSegment; i++) {
+      for (j=0; j<nSegment; j++) {
+	deviation[i][j]=USBLCD_segment_diff(i,j);
+      }
+    }
+    
+    while (nSegment>CHARS+2) {
+      min=65535;
+      pack_i=-1;
+      pack_j=-1;
+      for (i=2; i<nSegment; i++) {
+	if (pass1 && Segment[i].used) continue;
+	for (j=0; j<nSegment; j++) {
+	  if (deviation[i][j]<min) {
+	    min=deviation[i][j];
+	    pack_i=i;
+	    pack_j=j;
+	  }
+	}
+      }
+      if (pack_i==-1) {
+	if (pass1) {
+	  pass1=0;
+	  continue;
+	} else {
+	  error ("USBLCD: unable to compact bar characters");
+	  nSegment=CHARS;
+	  break;
+	}
+      } 
+      
+      nSegment--;
+      Segment[pack_i]=Segment[nSegment];
+      
+      for (i=0; i<nSegment; i++) {
+	deviation[pack_i][i]=deviation[nSegment][i];
+	deviation[i][pack_i]=deviation[i][nSegment];
+      }
+      
+      for (r=0; r<Lcd.rows; r++) {
+	for (c=0; c<Lcd.cols; c++) {
+	  if (Bar[r][c].segment==pack_i)
+	    Bar[r][c].segment=pack_j;
+	  if (Bar[r][c].segment==nSegment)
+	    Bar[r][c].segment=pack_i;
+	}
+      }
+    }
+  }
+}
+
+static void USBLCD_define_chars (void)
+{
+  int c, i, j;
+  char buffer[8];
+
+  for (i=2; i<nSegment; i++) {
+    if (Segment[i].used) continue;
+    if (Segment[i].ascii!=-1) continue;
+    for (c=0; c<CHARS; c++) {
+      for (j=2; j<nSegment; j++) {
+	if (Segment[j].ascii==c) break;
+      }
+      if (j==nSegment) break;
+    }
+    Segment[i].ascii=c;
+    switch (Segment[i].type) {
+    case BAR_L:
+      for (j=0; j<4; j++) {
+	char Pixel[] = { 0, 1, 3, 7, 15, 31 };
+	buffer[j]=Pixel[Segment[i].len1];
+	buffer[j+4]=Pixel[Segment[i].len2];
+      }
+      break;
+    case BAR_R:
+      for (j=0; j<4; j++) {
+	char Pixel[] = { 0, 16, 24, 28, 30, 31 };
+	buffer[j]=Pixel[Segment[i].len1];
+	buffer[j+4]=Pixel[Segment[i].len2];
+      }
+      break;
+    case BAR_U:
+      for (j=0; j<Segment[i].len1; j++) {
+	buffer[7-j]=31;
+      }
+      for (; j<YRES; j++) {
+	buffer[7-j]=0;
+      }
+      break;
+    case BAR_D:
+      for (j=0; j<Segment[i].len1; j++) {
+	buffer[j]=31;
+      }
+      for (; j<YRES; j++) {
+	buffer[j]=0;
+      }
+      break;
+    }
+    USBLCD_command (0x40|8*c, 40);
+    USBLCD_write (buffer, 8, 120); // 120 usec delay for CG RAM write
+  }
+}
+
+int USBLCD_clear (void)
+{
+  int row, col;
+
+  for (row=0; row<Lcd.rows; row++) {
+    for (col=0; col<Lcd.cols; col++) {
+      Txt[row][col]='\t';
+      Bar[row][col].len1=-1;
+      Bar[row][col].len2=-1;
+      Bar[row][col].type=0;
+      Bar[row][col].segment=-1;
+    }
+  }
+  USBLCD_command (0x01, 1640); // clear display
+  return 0;
+}
+
+int USBLCD_init (LCD *Self)
+{
+  int rows=-1, cols=-1 ;
+  char *port,*s ;
+
+  if (Port) {
+    free(Port);
+    Port=NULL;
+  }
+  if ((port=cfg_get("Port"))==NULL || *port=='\0') {
+    error ("USBLCD: no 'Port' entry in %s", cfg_file());
+    return -1;
+  }
+  if (port[0]=='/') Port=strdup(port);
+  else {
+    Port=(char *)malloc(5/*/dev/ */+strlen(port)+1);
+    sprintf(Port,"/dev/%s",port);
+  }
+
+  debug ("USBLCD using device %s ", Port);
+
+  s=cfg_get("Size");
+  if (s==NULL || *s=='\0') {
+    error ("USBLCD: no 'Size' entry in %s", cfg_file());
+    return -1;
+  }
+  if (sscanf(s,"%dx%d",&cols,&rows)!=2 || rows<1 || cols<1) {
+    error ("USBLCD: bad size '%s'",s);
+    return -1;
+  }
+
+  Self->rows=rows;
+  Self->cols=cols;
+  Lcd=*Self;
+  
+  if (USBLCD_open()!=0)
+    return -1;
+  
+  USBLCD_clear();
+  
+  return 0;
+}
+
+void USBLCD_goto (int row, int col)
+{
+  int pos;
+
+  pos=(row%2)*64+(row/2)*20+col;
+  USBLCD_command (0x80|pos, 40);
+}
+
+int USBLCD_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 USBLCD_bar (int type, int row, int col, int max, int len1, int len2)
+{
+  int rev=0;
+  
+  if (len1<1) len1=1;
+  else if (len1>max) len1=max;
+  
+  if (len2<1) len2=1;
+  else if (len2>max) len2=max;
+  
+  switch (type) {
+  case BAR_L:
+    len1=max-len1;
+    len2=max-len2;
+    rev=1;
+    
+  case BAR_R:
+    while (max>0 && col<=Lcd.cols) {
+      Bar[row][col].type=type;
+      Bar[row][col].segment=-1;
+      if (len1>=XRES) {
+	Bar[row][col].len1=rev?0:XRES;
+	len1-=XRES;
+      } else {
+	Bar[row][col].len1=rev?XRES-len1:len1;
+	len1=0;
+      }
+      if (len2>=XRES) {
+	Bar[row][col].len2=rev?0:XRES;
+	len2-=XRES;
+      } else {
+	Bar[row][col].len2=rev?XRES-len2:len2;
+	len2=0;
+      }
+      max-=XRES;
+      col++;
+    }
+    break;
+
+  case BAR_U:
+    len1=max-len1;
+    len2=max-len2;
+    rev=1;
+    
+  case BAR_D:
+    while (max>0 && row<=Lcd.rows) {
+      Bar[row][col].type=type;
+      Bar[row][col].segment=-1;
+      if (len1>=YRES) {
+	Bar[row][col].len1=rev?0:YRES;
+	len1-=YRES;
+      } else {
+	Bar[row][col].len1=rev?YRES-len1:len1;
+	len1=0;
+      }
+      if (len2>=YRES) {
+	Bar[row][col].len2=rev?0:YRES;
+	len2-=YRES;
+      } else {
+	Bar[row][col].len2=rev?YRES-len2:len2;
+	len2=0;
+      }
+      max-=YRES;
+      row++;
+    }
+    break;
+
+  }
+  return 0;
+}
+
+int USBLCD_flush (void)
+{
+  char buffer[256];
+  char *p;
+  int s, row, col;
+  
+  USBLCD_process_bars();
+  USBLCD_compact_bars();
+  USBLCD_define_chars();
+  
+  for (s=0; s<nSegment; s++) {
+    Segment[s].used=0;
+  }
+
+  for (row=0; row<Lcd.rows; row++) {
+    for (col=0; col<Lcd.cols; col++) {
+      s=Bar[row][col].segment;
+      if (s!=-1) {
+	Segment[s].used=1;
+	Txt[row][col]=Segment[s].ascii;
+      }
+    }
+    for (col=0; col<Lcd.cols; col++) {
+      if (Txt[row][col]=='\t') continue;
+      USBLCD_goto (row, col);
+      for (p=buffer; col<Lcd.cols; col++, p++) {
+	if (Txt[row][col]=='\t') break;
+	*p=Txt[row][col];
+      }
+      USBLCD_write (buffer, p-buffer, 40); // 40 usec delay for write
+    }
+  }
+
+
+  return 0;
+}
+
+int USBLCD_quit (void)
+{
+    debug ("closing port %s", Port);
+    close(usblcd_file);
+    exit(0);
+
+  return 0;
+}
+
+LCD USBLCD[] = {
+  { "USBLCD",0,0,XRES,YRES,BARS,0,USBLCD_init,USBLCD_clear,USBLCD_put,USBLCD_bar,NULL,USBLCD_flush,USBLCD_quit },
+  { NULL }
+};
-- 
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