diff options
Diffstat (limited to 'drv_BWCT.c')
| -rw-r--r-- | drv_BWCT.c | 401 |
1 files changed, 401 insertions, 0 deletions
diff --git a/drv_BWCT.c b/drv_BWCT.c new file mode 100644 index 0000000..2f7c864 --- /dev/null +++ b/drv_BWCT.c @@ -0,0 +1,401 @@ +/* $Id: drv_BWCT.c 975 2009-01-18 11:16:20Z michael $ + * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/drv_BWCT.c $ + * + * new style driver for BWCT USB LCD displays + * + * Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.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. + * + */ + +/* + * + * 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 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_set_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("BWCT USB to HD44780 interface"); + 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, "$Rev: 975 $"); + + /* 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, +}; |