diff options
Diffstat (limited to 'drv_ASTUSB.c')
| -rw-r--r-- | drv_ASTUSB.c | 512 |
1 files changed, 512 insertions, 0 deletions
diff --git a/drv_ASTUSB.c b/drv_ASTUSB.c new file mode 100644 index 0000000..6cc0297 --- /dev/null +++ b/drv_ASTUSB.c @@ -0,0 +1,512 @@ +/* $Id: $ + * $URL: $ + * + * driver for Attiny2313 USB LCD display interface + * see http://ast.m-faq.de/USB-LCD/USB-LCD.htm for schematics + * + * Copyright 2005 Till Harbaum <till@harbaum.org> + * Copyright 2005 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_LCD2USB + * + */ + +#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 <ctype.h> +#include <sys/ioctl.h> +#include <sys/time.h> + +#include <usb.h> + +#include "debug.h" +#include "cfg.h" +#include "timer.h" +#include "qprintf.h" +#include "plugin.h" +#include "widget.h" +#include "widget_text.h" +#include "widget_icon.h" +#include "widget_bar.h" +#include "widget_keypad.h" +#include "drv.h" +#include "drv_generic_text.h" + + +#define LCD_USB_VENDOR 0x03eb +#define LCD_USB_DEVICE 0x7a53 + +#define CMD_LCD_ECHO (0<<5) +#define CMD_LCD_INIT 1 +#define CMD_LCD_COMMAND 2 +#define CMD_LCD_DATA 3 +#define CMD_LCD_BLIGHT 4 + + +/* target is a bit map for CMD/DATA */ +#define LCD_CTRL_0 (1<<0) +#define LCD_CTRL_1 (1<<1) +#define LCD_BOTH (LCD_CTRL_0 | LCD_CTRL_1) + + +static char Name[] = "ASTUSB"; +static char *device_id = NULL, *bus_id = NULL; + +static usb_dev_handle *lcd; +static int controllers = 0; + +extern int got_signal; + +enum { + LCD_INIT_INCREASE = 1 << 0, + LCD_INIT_SHIFT = 1 << 1, + LCD_INIT_CON = 1 << 2, + LCD_INIT_BON = 1 << 3, + LCD_INIT_DSHIFT = 1 << 4, + LCD_INIT_RSHIFT = 1 << 5, + LCD_INIT_2LINES = 1 << 6, + LCD_INIT_FONT = 1 << 7 +}; + +/****************************************/ +/*** hardware dependant functions ***/ +/****************************************/ + +static int drv_AST_HW_open(char *bus_id, char *device_id) +{ + struct usb_bus *busses, *bus; + struct usb_device *dev; + + lcd = NULL; + + info("%s: scanning USB for ASTUSB interface ...", Name); + + if (bus_id != NULL) + info("%s: scanning for bus id: %s", Name, bus_id); + + if (device_id != NULL) + info("%s: scanning for device id: %s", Name, device_id); + + usb_set_debug(0); + + usb_init(); + usb_find_busses(); + usb_find_devices(); + busses = usb_get_busses(); + + for (bus = busses; bus; bus = bus->next) { + /* search this bus if no bus id was given or if this is the given bus id */ + if (!bus_id || (bus_id && !strcasecmp(bus->dirname, bus_id))) { + + for (dev = bus->devices; dev; dev = dev->next) { + /* search this device if no device id was given or if this is the given device id */ + if (!device_id || (device_id && !strcasecmp(dev->filename, device_id))) { + + if ((dev->descriptor.idVendor == LCD_USB_VENDOR) && (dev->descriptor.idProduct == LCD_USB_DEVICE)) { + info("%s: found ASTUSB interface on bus %s device %s", Name, bus->dirname, dev->filename); + lcd = usb_open(dev); + if (usb_claim_interface(lcd, 0) < 0) { + error("%s: usb_claim_interface() failed!", Name); + return -1; + } + return 0; + } + } + } + } + } + return -1; +} + +static int drv_AST_HW_close(void) +{ + usb_release_interface(lcd, 0); + usb_close(lcd); + + return 0; +} + +static int drv_AST_HW_data(unsigned char *buffer, short length, int __attribute__ ((unused)) index) +{ + int request = CMD_LCD_DATA; + int value = 0; + + if (usb_control_msg + (lcd, USB_TYPE_VENDOR | USB_RECIP_DEVICE, request, value, 0 /*index */ , (char *) buffer, length, 1000) < 0) { + error("%s: USB request failed! Trying to reconnect device.", Name); + + usb_release_interface(lcd, 0); + usb_close(lcd); + + /* try to close and reopen connection */ + if (drv_AST_HW_open(bus_id, device_id) < 0) { + error("%s: could not re-detect ASTUSB USB LCD", Name); + got_signal = -1; + return -1; + } + /* and try to re-send command */ + if (usb_control_msg + (lcd, USB_TYPE_VENDOR | USB_RECIP_DEVICE, request, value, 0 /*index */ , (char *) buffer, length, + 1000) < 0) { + error("%s: retried USB request failed, aborting!", Name); + got_signal = -1; + return -1; + } + + info("%s: Device successfully reconnected.", Name); + } + + return 0; +} + +/* send a number of 16 bit words to the lcd2usb interface */ +/* and verify that they are correctly returned by the echo */ +/* command. This may be used to check the reliability of */ +/* the usb interfacing */ +#define ECHO_NUM 10 + + +static int drv_AST_HW_cmd(unsigned char cmd, short value, int __attribute__ ((unused)) index) +{ + unsigned char buffer[2]; + int nBytes; + + /* send control request and accept return value */ + nBytes = usb_control_msg(lcd, + USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN, + cmd, value, 0 /*index */ , (char *) buffer, sizeof(buffer), 1000); + + if (nBytes < 0) { + error("%s: USB request failed!", Name); + return -1; + } + + return buffer[0] + 256 * buffer[1]; +} + +int drv_AST_HW_echo(void) +{ + int i, errors = 0; + char val; + char buffer[2]; + + for (i = 0; i < ECHO_NUM; i++) { + val = rand() & 0xff; //8 bit number + + if (usb_control_msg(lcd, + USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN, + CMD_LCD_ECHO, val, 0, buffer, sizeof(buffer), 1000) < 0) { + error("%s: USB request failed!", Name); + return -1; + } + + if (val != buffer[1]) + errors++; + } + + if (errors) { + error("%s: ERROR, %d out of %d echo transfers failed!", Name, errors, ECHO_NUM); + return -1; + } else + info("%s: echo test successful", Name); + + + return 0; +} + + +/* command format: + * 7 6 5 4 3 2 1 0 + * C C C T T R L L + * + * TT = target bit map + * R = reserved for future use, set to 0 + * LL = number of bytes in transfer - 1 + */ + +short drv_AST_LCD_BL(int backlight) +{ + + if (backlight < 0) + backlight = 0; + else if (backlight > 1) + backlight = 1; + + drv_AST_HW_cmd(CMD_LCD_BLIGHT, backlight, 0); + + return backlight; +} + + +static void drv_AST_clear(void) +{ + drv_AST_HW_cmd(CMD_LCD_COMMAND, 0x01, LCD_BOTH & controllers); /* clear display */ + drv_AST_HW_cmd(CMD_LCD_COMMAND, 0x03, LCD_BOTH & controllers); /* return home */ +} + +static void drv_AST_write(const int row, const int col, const char *data, int len) +{ + int pos, ctrl = LCD_CTRL_0; + int tmpRow = row; + + /* displays with more two rows and 20 columns have a logical width */ + /* of 40 chars and use more than one controller */ + if ((DROWS > 2) && (DCOLS > 20) && (row > 1)) { + /* use second controller */ + tmpRow -= 2; + ctrl = LCD_CTRL_1; + } + + /* 16x4 Displays use a slightly different layout */ + if (DCOLS == 16 && DROWS == 4) { + pos = (tmpRow % 2) * 64 + (tmpRow / 2) * 16 + col; + } else { + pos = (tmpRow % 2) * 64 + (tmpRow / 2) * 20 + col; + } + + drv_AST_HW_cmd(CMD_LCD_COMMAND, 0x80 | pos, (ctrl & controllers)); + drv_AST_HW_data((unsigned char *) data, len, (ctrl & controllers)); + +} + +static void drv_AST_defchar(const int ascii, const unsigned char *matrix) +{ + int i; + unsigned char buffer[8]; + + //build buffer + for (i = 0; i < 8; i++) { + buffer[i] = *matrix++ & 0x1f; + } + + //send to HW + drv_AST_HW_cmd(CMD_LCD_COMMAND, 0x40 | 8 * ascii, LCD_BOTH & controllers); + drv_AST_HW_data((unsigned char *) buffer, sizeof(buffer), LCD_BOTH & controllers); +} + +static int drv_AST_start(const char *section, const int quiet) +{ +// int contrast, brightness; + int backlight; + 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; + + /* bus id and device id are strings and not just intergers, since */ + /* the windows port of libusb treats them as strings. And this way */ + /* we keep windows compatibility ... just in case ... */ + bus_id = cfg_get(section, "Bus", NULL); + device_id = cfg_get(section, "Device", NULL); + + if (drv_AST_HW_open(bus_id, device_id) < 0) { + error("%s: could not find a ASTUSB USB LCD", Name); + return -1; + } + + /* test interface reliability */ + drv_AST_HW_echo(); + + /*low level init of init LCD */ + if (drv_AST_HW_cmd(CMD_LCD_INIT, LCD_INIT_INCREASE | (DROWS > 1 ? LCD_INIT_2LINES : 1), LCD_BOTH & controllers) < 0) { + error("%s: could not init LCD", Name); + return -1; + } + + if (cfg_number(section, "Backlight", 0, 0, 1, &backlight) > 0) { + info("%s: backlight %s", Name, backlight ? "enabled" : "disabled"); + drv_AST_LCD_BL(backlight); + } + + drv_AST_clear(); /* clear display */ + + if (!quiet) { + char buffer[40]; + qprintf(buffer, sizeof(buffer), "%s %dx%d", Name, DCOLS, DROWS); + if (drv_generic_text_greet(buffer, "AST USB-LCD")) { + sleep(3); + drv_AST_clear(); + } + } + + return 0; +} + + +/****************************************/ +/*** plugins ***/ +/****************************************/ + +static void plugin_backlight(RESULT * result, RESULT * arg1) +{ + double backlight; + + backlight = drv_AST_LCD_BL(R2N(arg1)); + SetResult(&result, R_NUMBER, &backlight); +} + +/****************************************/ +/*** 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_AST_list(void) +{ + printf("ASTUSB display interface"); + return 0; +} + + +/* initialize driver & display */ +int drv_AST_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_AST_write; + drv_generic_text_real_defchar = drv_AST_defchar; + + /* start display */ + if ((ret = drv_AST_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); + // AddFunction("LCD::brightness", 1, plugin_brightness); + AddFunction("LCD::backlight", 1, plugin_backlight); + + return 0; +} + + +/* close driver & display */ +int drv_AST_quit(const int quiet) +{ + + info("%s: shutting down.", Name); + + drv_generic_text_quit(); + + /* clear display */ + drv_AST_clear(); + + /* say goodbye... */ + if (!quiet) { + drv_generic_text_greet("That's all, folks!", NULL); + } + + drv_AST_LCD_BL(0); + + debug("closing USB connection"); + drv_AST_HW_close(); + + return (0); +} + + +DRIVER drv_ASTUSB = { + .name = Name, + .list = drv_AST_list, + .init = drv_AST_init, + .quit = drv_AST_quit, +}; |