[lcd4linux @ 2004-09-24 21:40:52 by reinelt]

new driver for the BWCT USB LCD interface board.

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@492 3ae390bd-cb1e-0410-b409-cd5a39f66f1f

1 files changed, 402 insertions, 0 deletions

diff --git a/drv_BWCT.c b/drv_BWCT.c
new file mode 100644
index 0000000..6bf2617
--- /dev/null
+++ b/drv_BWCT.c
@@ -0,0 +1,402 @@
+/* $Id: drv_BWCT.c,v 1.1 2004/09/24 21:41:00 reinelt Exp $
+ *
+ * new style driver for BWCT USB LCD displays
+ *
+ * Copyright 1999-2004 Michael Reinelt <reinelt@eunet.at>
+ * Copyright 2004 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.
+ *
+ *
+ * $Log: drv_BWCT.c,v $
+ * Revision 1.1  2004/09/24 21:41:00  reinelt
+ * new driver for the BWCT USB LCD interface board.
+ *
+ */
+
+/* 
+ *
+ * exported fuctions:
+ *
+ * struct DRIVER drv_BWCT
+ *
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <termios.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+
+#include <usb.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"
+
+
+#define LCD_USB_VENDOR 0x03da
+#define LCD_USB_DEVICE 0x0002
+
+#define LCD_RESET    1
+#define LCD_CMD      2
+#define LCD_DATA     3
+#define LCD_CONTRAST 4
+
+
+static char Name[]="BWCT";
+
+static usb_dev_handle *lcd;
+static int interface;
+
+extern int usb_debug;
+extern int got_signal;
+
+
+/****************************************/
+/***  hardware dependant functions    ***/
+/****************************************/
+
+static int drv_BW_open (void)
+{
+  struct usb_bus *busses, *bus;
+  struct usb_device *dev;
+  
+  lcd = NULL;
+
+  info ("%s: scanning USB for BWCT LCD...", Name);
+
+  usb_debug = 0;
+  
+  usb_init();
+  usb_find_busses();
+  usb_find_devices();
+  busses = usb_get_busses();
+
+  for (bus = busses; bus; bus = bus->next) {
+    for (dev = bus->devices; dev; dev = dev->next) {
+      if (dev->descriptor.idVendor != LCD_USB_VENDOR) continue;
+      /* Loop through all of the configurations */
+      int c;
+      for (c = 0; c < dev->descriptor.bNumConfigurations; c++) {
+	int i;
+	for (i = 0; i < dev->config[c].bNumInterfaces; i++) {
+	  int a;
+	  for (a = 0; a < dev->config[c].interface[i].num_altsetting; a++) {
+	    if ((dev->descriptor.idProduct == LCD_USB_DEVICE) ||
+		((dev->config[c].interface[i].altsetting[a].bInterfaceClass == 0xff) && 
+		 (dev->config[c].interface[i].altsetting[a].bInterfaceSubClass == 0x01))) {
+	      info ("%s: found BWCT USB LCD on bus %s device %s", Name, bus->dirname, dev->filename);
+	      interface = i;
+	      lcd = usb_open(dev);
+	      if (usb_claim_interface(lcd, interface) < 0) {
+		error ("%s: usb_claim_interface() failed!", Name);
+		return -1;
+	      }
+	      return 0;
+	    }
+	  }
+	}
+      }
+    }
+  }
+  return -1;
+}
+
+
+static int drv_BW_close (void) 
+{
+  usb_release_interface(lcd, interface);
+  usb_close(lcd);
+
+  return 0;
+}
+
+
+static int drv_BW_send (int request, int value)
+{
+  static int errors = 0;
+  
+  if (errors > 20) return -1;
+  
+  if (usb_control_msg(lcd, USB_TYPE_VENDOR, request, value, interface, NULL, 0, 1000) < 0) {
+    error("%s: USB request failed!", Name);
+    if (++errors > 20) {
+      error("%s: too many USB errors, aborting.", Name);
+      got_signal = -1;
+    }
+    return -1;
+  }
+  errors = 0;
+  return 0;
+}
+
+
+static void drv_BW_command (const unsigned char cmd)
+{
+  drv_BW_send (LCD_CMD, cmd);
+}
+
+
+static void drv_BW_clear (void)
+{
+  drv_BW_command (0x01); /* clear display */
+  drv_BW_command (0x03); /* return home */
+}
+
+
+static void drv_BW_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_BW_command (0x80|pos);
+  
+  while (len--) {
+    drv_BW_send (LCD_DATA, *data++);
+  }
+}
+
+static void drv_BW_defchar (const int ascii, const unsigned char *matrix)
+{
+  int i;
+  
+  drv_BW_command (0x40|8*ascii);
+
+  for (i = 0; i < 8; i++) {
+    drv_BW_send (LCD_DATA, *matrix++ & 0x1f);
+  }
+}
+
+
+static int drv_BW_contrast (int contrast)
+{
+  if (contrast <   0) contrast =   0;
+  if (contrast > 255) contrast = 255;
+
+  drv_BW_send (LCD_CONTRAST, contrast);
+
+  return contrast;
+}
+
+  
+static int drv_BW_start (const char *section, const int quiet)
+{
+  int contrast;
+  int rows=-1, cols=-1;
+  char *s;
+
+  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;
+  
+  if (drv_BW_open() < 0) {
+    error ("%s: could not find a BWCT USB LCD", Name);
+    return -1;
+  }
+
+  /* reset */
+  drv_BW_send (LCD_RESET, 0);
+
+  /* initialize display */
+  drv_BW_command (0x29); /* 8 Bit mode, 1/16 duty cycle, 5x8 font */
+  drv_BW_command (0x08); /* Display off, cursor off, blink off */
+  drv_BW_command (0x0c); /* Display on, cursor off, blink off */
+  drv_BW_command (0x06); /* curser moves to right, no shift */
+
+
+  if (cfg_number(section, "Contrast", 0, 0, 100, &contrast) > 0) {
+    drv_BW_contrast(contrast);
+  }
+
+  drv_BW_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_BW_clear();
+    }
+  }
+    
+  return 0;
+}
+
+
+/****************************************/
+/***            plugins               ***/
+/****************************************/
+
+static void plugin_contrast (RESULT *result, RESULT *arg1)
+{
+  double contrast;
+  
+  contrast = drv_BW_contrast(R2N(arg1));
+  SetResult(&result, R_NUMBER, &contrast); 
+}
+
+
+/****************************************/
+/***        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_BW_list (void)
+{
+  printf ("generic");
+  return 0;
+}
+
+
+/* initialize driver & display */
+int drv_BW_init (const char *section, const int quiet)
+{
+  WIDGET_CLASS wc;
+  int asc255bug;
+  int ret;  
+  
+  /* 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 */
+  GOTO_COST = 2;  /* number of bytes a goto command requires */
+  
+  /* real worker functions */
+  drv_generic_text_real_write   = drv_BW_write;
+  drv_generic_text_real_defchar = drv_BW_defchar;
+
+
+  /* start display */
+  if ((ret=drv_BW_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 */
+  AddFunction ("LCD::contrast", 1, plugin_contrast);
+
+  return 0;
+}
+
+
+/* close driver & display */
+int drv_BW_quit (const int quiet)
+{
+
+  info("%s: shutting down.", Name);
+  
+  drv_generic_text_quit();
+  
+  /* clear display */
+  drv_BW_clear();
+  
+  /* say goodbye... */
+  if (!quiet) {
+    drv_generic_text_greet ("goodbye!", NULL);
+  }
+  
+  debug ("closing USB connection");
+  drv_BW_close();
+  
+  return (0);
+}
+
+
+DRIVER drv_BWCT = {
+  name: Name,
+  list: drv_BW_list,
+  init: drv_BW_init,
+  quit: drv_BW_quit, 
+};
+
+