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|
/* $Id: drv_BWCT.c,v 1.6 2006/01/30 06:25:48 reinelt Exp $
*
* new style driver for BWCT USB LCD displays
*
* Copyright (C) 2003 Michael Reinelt <reinelt@eunet.at>
* Copyright (C) 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 1.6 2006/01/30 06:25:48 reinelt
* added CVS Revision
*
* Revision 1.5 2006/01/05 15:53:45 nicowallmeier
* fixed compatility with gcc 2.95
*
* Revision 1.4 2005/12/11 14:55:28 reinelt
* contrast range for BWCT is 0..255, not 0..100
*
* Revision 1.3 2005/05/08 04:32:43 reinelt
* CodingStyle added and applied
*
* Revision 1.2 2005/01/18 06:30:22 reinelt
* added (C) to all copyright statements
*
* 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) {
int c;
if (dev->descriptor.idVendor != LCD_USB_VENDOR)
continue;
/* Loop through all of the configurations */
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, 255, &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;
info("%s: %s", Name, "$Revision: 1.6 $");
/* 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,
};
|
