[lcd4linux @ 2003-09-29 06:58:36 by reinelt]

new driver for Milford Instruments MI420 by Andy Baxter

1 files changed, 332 insertions, 0 deletions

diff --git a/MilfordInstruments.c b/MilfordInstruments.c
new file mode 100644
index 0000000..564c6c1
--- /dev/null
+++ b/MilfordInstruments.c
@@ -0,0 +1,332 @@
+/* $Id: MilfordInstruments.c,v 1.1 2003/09/29 06:58:36 reinelt Exp $
+ *
+ * driver for Milford Instruments serial display modules
+ *
+ * Written 2003 by Andy Baxter <andy@earthsong.free-online.co.uk>
+ *
+ * based on the MatrixOrbital driver by M. Reinelt 
+ *
+ * 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: MilfordInstruments.c,v $
+ * Revision 1.1  2003/09/29 06:58:36  reinelt
+ * new driver for Milford Instruments MI420 by Andy Baxter
+ *
+ */
+
+/* 
+ *
+ * exported fuctions:
+ *
+ * struct LCD MilfordInstruments[]
+ *
+ */
+
+#include <stdlib.h>
+#include <stdio.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"
+#include "icon.h"
+
+#define XRES 5
+#define YRES 8
+#define CHARS 8
+
+static LCD Lcd;
+static char *Port=NULL;
+static speed_t Speed;
+static int Device=-1;
+static int Icons;
+
+static char *FrameBuffer1=NULL;
+static char *FrameBuffer2=NULL;
+
+
+static int MI_open (void)
+{
+  int fd;
+  pid_t pid;
+  struct termios portset;
+  
+  if ((pid=lock_port(Port))!=0) {
+    if (pid==-1)
+      error ("MilfordInstruments: port %s could not be locked", Port);
+    else
+      error ("MilfordInstruments: port %s is locked by process %d", Port, pid);
+    return -1;
+  }
+  fd = open(Port, O_RDWR | O_NOCTTY | O_NDELAY); 
+  if (fd==-1) {
+    error ("MilfordInstruments: open(%s) failed: %s", Port, strerror(errno));
+    unlock_port(Port);
+    return -1;
+  }
+  if (tcgetattr(fd, &portset)==-1) {
+    error ("MilfordInstruments: tcgetattr(%s) failed: %s", Port, strerror(errno));
+    unlock_port(Port);
+    return -1;
+  }
+  cfmakeraw(&portset);
+  cfsetospeed(&portset, Speed);
+  if (tcsetattr(fd, TCSANOW, &portset)==-1) {
+    error ("MilfordInstruments: tcsetattr(%s) failed: %s", Port, strerror(errno));
+    unlock_port(Port);
+    return -1;
+  }
+  return fd;
+}
+
+
+static void MI_write (char *string, int len)
+{
+  if (Device==-1) return;
+  if (write (Device, string, len)==-1) {
+    if (errno==EAGAIN) {
+      usleep(1000);
+      if (write (Device, string, len)>=0) return;
+    }
+    error ("MilfordInstruments: write(%s) failed: %s", Port, strerror(errno));
+  }
+}
+
+
+static void MI_define_char (int ascii, char *buffer)
+{
+  char cmd[3]="\376x";
+  if (ascii<8) {
+    cmd[2]=(char)(64+ascii*8);
+    MI_write (cmd, 3);
+    MI_write (buffer, 8);
+  }
+}
+
+
+static int MI_clear (int full)
+{
+  memset (FrameBuffer1, ' ', Lcd.rows*Lcd.cols*sizeof(char));
+
+  icon_clear();
+  bar_clear();
+  
+  if (full) {
+    memset (FrameBuffer2, ' ', Lcd.rows*Lcd.cols*sizeof(char));
+    MI_write ("\376\001", 2);  // clear screen
+    }
+  return 0;
+}
+
+
+static int MI_init (LCD *Self)
+{
+  char *port;
+  int speed;
+
+  Lcd=*Self;
+
+  // Init the framebuffers
+  FrameBuffer1 = (char*)malloc(Lcd.cols*Lcd.rows*sizeof(char));
+  FrameBuffer2 = (char*)malloc(Lcd.cols*Lcd.rows*sizeof(char));
+  if (FrameBuffer1==NULL || FrameBuffer2==NULL) {
+    error ("MilfordInstruments: framebuffer could not be allocated: malloc() failed");
+    return -1;
+  }
+
+  if (Port) {
+    free (Port);
+    Port=NULL;
+  }
+
+  port=cfg_get ("Port",NULL);
+  if (port==NULL || *port=='\0') {
+    error ("MilfordInstruments: no 'Port' entry in %s", cfg_source());
+    return -1;
+  }
+  Port=strdup(port);
+
+  if (cfg_number("Speed", 19200, 1200,19200, &speed)<0) return -1;
+  switch (speed) {
+  case 2400:
+    Speed=B2400;
+    break;
+  case 9600:
+    Speed=B9600;
+    break;
+  default:
+    error ("MilfordInstruments: unsupported speed '%d' in %s", speed, cfg_source());
+    return -1;
+  }    
+  
+  debug ("using port %s at %d baud", Port, speed);
+  
+  Device=MI_open();
+  if (Device==-1) return -1;
+
+  if (cfg_number("Icons", 0, 0, CHARS, &Icons)<0) return -1;
+  if (Icons>0) {
+    debug ("reserving %d of %d user-defined characters for icons", Icons, CHARS);
+    icon_init(Lcd.rows, Lcd.cols, XRES, YRES, CHARS, Icons, MI_define_char);
+    Self->icons=Icons;
+    Lcd.icons=Icons;
+  }
+  
+  bar_init(Lcd.rows, Lcd.cols, XRES, YRES, CHARS-Icons);
+  bar_add_segment(  0,  0,255, 32); // ASCII  32 = blank
+  bar_add_segment(255,255,255,255); // ASCII 255 = block
+
+  MI_clear(1);
+
+  MI_write ("\376\014", 2);  // cursor off
+
+  return 0;
+}
+
+
+void MI_goto (int row, int col)
+{
+  char cmd[2]="\376x";
+  char ddbase=0;
+  switch (row) {
+  case 0:
+    ddbase=128;
+    break;
+  case 1:
+    ddbase=192;
+    break;
+  case 2:
+    ddbase=148;
+    break;
+  case 3:
+    ddbase=212;
+    break;
+  }
+  cmd[1]=(char)(ddbase+col);
+  MI_write(cmd,2);
+}
+
+
+int MI_put (int row, int col, char *text)
+{
+  char *p=FrameBuffer1+row*Lcd.cols+col;
+  char *t=text;
+  
+  while (*t && col++<=Lcd.cols) {
+    *p++=*t++;
+  }
+  return 0;
+}
+
+
+int MI_bar (int type, int row, int col, int max, int len1, int len2)
+{
+  return bar_draw (type, row, col, max, len1, len2);
+}
+
+
+int MI_icon (int num, int seq, int row, int col)
+{
+  return icon_draw (num, seq, row, col);
+}
+
+
+static int MI_flush (void)
+{
+  int row, col, pos1, pos2;
+  int c, equal;
+  
+  bar_process(MI_define_char);
+  
+  for (row=0; row<Lcd.rows; row++) {
+    for (col=0; col<Lcd.cols; col++) {
+      c=bar_peek(row, col);
+      if (c==-1) c=icon_peek(row, col);
+      if (c!=-1) {
+	FrameBuffer1[row*Lcd.cols+col]=(char)c;
+      }
+    }
+    for (col=0; col<Lcd.cols; col++) {
+      if (FrameBuffer1[row*Lcd.cols+col]==FrameBuffer2[row*Lcd.cols+col]) continue;
+      MI_goto (row, col);
+      for (pos1=col++, pos2=pos1, equal=0; col<Lcd.cols; col++) {
+	if (FrameBuffer1[row*Lcd.cols+col]==FrameBuffer2[row*Lcd.cols+col]) {
+	  // If we find just one equal byte, we don't break, because this 
+	  // would require a goto, which takes one byte, too.
+	  if (++equal>5) break;
+	} else {
+	  pos2=col;
+	  equal=0;
+	}
+      }
+      MI_write (FrameBuffer1+row*Lcd.cols+pos1, pos2-pos1+1);
+    }
+  }
+  
+  memcpy (FrameBuffer2, FrameBuffer1, Lcd.rows*Lcd.cols*sizeof(char));
+
+  return 0;
+}
+
+
+int MI_quit (void)
+{
+  info("MilfordInstruments: shutting down.");
+
+  debug ("closing port %s", Port);
+  close (Device);
+  unlock_port(Port);
+
+  if (FrameBuffer1) {
+    free(FrameBuffer1);
+    FrameBuffer1=NULL;
+  }
+
+  if (FrameBuffer2) {
+    free(FrameBuffer2);
+    FrameBuffer2=NULL;
+  }
+
+  return (0);
+}
+
+
+LCD MilfordInstruments[] = {
+  { name: "MI420",
+    rows:  4, 
+    cols:  20,
+    xres:  XRES,
+    yres:  YRES,
+    bars:  BAR_L | BAR_R | BAR_U | BAR_D | BAR_H2,
+    icons: 0,
+    gpos:  0,
+    init:  MI_init,
+    clear: MI_clear,
+    put:   MI_put,
+    bar:   MI_bar,
+    icon:  MI_icon,
+    gpo:   NULL,
+    flush: MI_flush,
+    quit:  MI_quit 
+  },
+  { NULL }
+};