dtv-scan-tables.git - dtv-scan-tables Debian packaging

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/* $Id: drv_HD44780.c,v 1.54 2005/06/09 17:41:47 reinelt Exp $ * * new style driver for HD44780-based displays * * Copyright (C) 2003 Michael Reinelt <reinelt@eunet.at> * Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net> * * Support for I2C bus * Copyright (C) 2005 Luis Correia <lfcorreia@users.sf.net> * * Modification for 4-Bit mode * Copyright (C) 2003 Martin Hejl (martin@hejl.de) * * Modification for 2nd controller support * Copyright (C) 2003 Jesse Brook Kovach <jkovach@wam.umd.edu> * * 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_HD44780.c,v $ * Revision 1.54 2005/06/09 17:41:47 reinelt * M50530 fixes (many thanks to Szymon Bieganski) * * Revision 1.53 2005/06/01 11:17:54 pk_richman * marked unused parameters * * Revision 1.52 2005/05/31 21:28:42 lfcorreia * fix typo * * Revision 1.50 2005/05/31 20:42:55 lfcorreia * new file: lcd4linux_i2c.h * avoid the problems detecting the proper I2C kernel include files * * rearrange all the other autoconf stuff to remove I2C detection * * new method by Paul Kamphuis to write to the I2C device * * Revision 1.49 2005/05/08 04:32:44 reinelt * CodingStyle added and applied * * Revision 1.48 2005/05/05 08:36:12 reinelt * changed SELECT to SLCTIN * * Revision 1.47 2005/03/28 22:29:23 reinelt * HD44780 multiple displays patch from geronet * * Revision 1.46 2005/03/28 19:39:23 reinelt * HD44780/I2C patch from Luis merged (still does not work for me) * * Revision 1.45 2005/03/25 15:44:43 reinelt * HD44780 Backlight fixed (thanks to geronet) * * Revision 1.44 2005/01/29 09:30:56 reinelt * minor HD44780 cleanups * * Revision 1.43 2005/01/18 06:30:23 reinelt * added (C) to all copyright statements * * Revision 1.42 2005/01/17 06:38:48 reinelt * info about backlight and brightness * * Revision 1.41 2005/01/17 06:29:24 reinelt * added software-controlled backlight support to HD44780 * * Revision 1.40 2004/11/30 05:01:25 reinelt * removed compiler warnings for deactivated i2c bus * * Revision 1.39 2004/10/17 09:24:31 reinelt * I2C support for HD44780 displays by Luis (does not work by now) * * Revision 1.38 2004/09/19 09:31:19 reinelt * HD44780 busy flag checking improved: fall back to busy-waiting if too many errors occur * * Revision 1.37 2004/09/18 15:58:57 reinelt * even more HD44780 cleanups, hardwiring for LCM-162 * * Revision 1.36 2004/09/18 10:57:29 reinelt * more parport/i2c cleanups * * Revision 1.35 2004/09/18 09:48:29 reinelt * HD44780 cleanup and prepararation for I2C backend * LCM-162 submodel framework * * Revision 1.34 2004/09/18 08:22:59 reinelt * drv_generic_parport_status() to read status lines * * Revision 1.33 2004/08/29 13:03:41 reinelt * * added RouterBoard driver * * Revision 1.32 2004/06/26 12:04:59 reinelt * * uh-oh... the last CVS log message messed up things a lot... * * Revision 1.31 2004/06/26 09:27:20 reinelt * * added '-W' to CFLAGS * changed all C++ comments to C ones * cleaned up a lot of signed/unsigned mistakes * * Revision 1.30 2004/06/20 10:09:54 reinelt * * 'const'ified the whole source * * Revision 1.29 2004/06/06 06:51:59 reinelt * * do not display end splash screen if quiet=1 * * Revision 1.28 2004/06/05 06:41:39 reinelt * * chancged splash screen again * * Revision 1.27 2004/06/05 06:13:11 reinelt * * splash screen for all text-based display drivers * * Revision 1.26 2004/06/02 10:09:22 reinelt * * splash screen for HD44780 * * Revision 1.25 2004/06/02 09:41:19 reinelt * * prepared support for startup splash screen * * Revision 1.24 2004/06/01 06:45:29 reinelt * * some Fixme's processed * documented some code * * Revision 1.23 2004/05/31 05:38:02 reinelt * * fixed possible bugs with user-defined chars (clear high bits) * thanks to Andy Baxter for debugging the MilfordInstruments driver! * * Revision 1.22 2004/05/27 03:39:47 reinelt * * changed function naming scheme to plugin::function * * Revision 1.21 2004/05/26 11:37:36 reinelt * * Curses driver ported. * * Revision 1.20 2004/05/22 04:23:49 reinelt * * removed 16*x fix again (next time think before commit :-) * * Revision 1.19 2004/05/22 04:21:02 reinelt * * fix for display RAM layout on 16x4 displays (thanks to toxicated101) * * Revision 1.18 2004/03/20 07:31:32 reinelt * support for HD66712 (which has a different RAM layout) * further threading development * * Revision 1.17 2004/03/19 09:17:46 reinelt * * removed the extra 'goto' function, row and col are additional parameters * of the write() function now. * * Revision 1.16 2004/03/11 06:39:58 reinelt * big patch from Martin: * - reuse filehandles * - memory leaks fixed * - earlier busy-flag checking with HD44780 * - reuse memory for strings in RESULT and hash * - netdev_fast to wavid time-consuming regex * * Revision 1.15 2004/03/03 03:47:04 reinelt * big patch from Martin Hejl: * - use qprintf() where appropriate * - save CPU cycles on gettimeofday() * - add quit() functions to free allocated memory * - fixed lots of memory leaks * * Revision 1.14 2004/03/01 04:29:51 reinelt * cfg_number() returns -1 on error, 0 if value not found (but default val used), * and 1 if value was used from the configuration. * HD44780 driver adopted to new cfg_number() * Crystalfontz 631 driver nearly finished * * Revision 1.13 2004/02/15 21:43:43 reinelt * T6963 driver nearly finished * framework for graphic displays done * i2c_sensors patch from Xavier * some more old generation files removed * * Revision 1.12 2004/02/14 11:56:17 reinelt * M50530 driver ported * changed lots of 'char' to 'unsigned char' * * Revision 1.11 2004/02/04 19:10:51 reinelt * Crystalfontz driver nearly finished * * Revision 1.10 2004/02/02 05:22:16 reinelt * Brightness fpr Noritake Displays avaliable as a plugin * * Revision 1.9 2004/02/01 11:51:22 hejl * Fixes for busy flag * * Revision 1.8 2004/02/01 08:05:12 reinelt * Crystalfontz 633 extensions (CRC checking and stuff) * Models table for HD44780 * Noritake VFD BVrightness patch from Bill Paxton * * Revision 1.7 2004/01/30 07:12:35 reinelt * HD44780 busy-flag support from Martin Hejl * loadavg() uClibc replacement from Martin Heyl * round() uClibc replacement from Martin Hejl * warning in i2c_sensors fixed * [ * * Revision 1.6 2004/01/29 04:40:02 reinelt * every .c file includes "config.h" now * * Revision 1.5 2004/01/23 07:04:17 reinelt * icons finished! * * Revision 1.4 2004/01/23 04:53:48 reinelt * icon widget added (not finished yet!) * * Revision 1.3 2004/01/22 07:57:45 reinelt * several bugs fixed where segfaulting on layout>display * Crystalfontz driver optimized, 632 display already works * * Revision 1.2 2004/01/21 06:39:27 reinelt * HD44780 missed the "clear display' sequence * asc255bug handling added * HD44780 tested, works here! * * Revision 1.1 2004/01/20 15:32:49 reinelt * first version of Next Generation HD44780 (untested! but it compiles...) * some cleanup in the other drivers * */ /* * * exported fuctions: * * struct DRIVER drv_HD44780 * */ #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/time.h> #include <sys/ioctl.h> #include "debug.h" #include "cfg.h" #include "udelay.h" #include "qprintf.h" #include "timer.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" #include "drv_generic_parport.h" #ifdef WITH_I2C #include "drv_generic_i2c.h" #endif static char Name[] = "HD44780"; static int Bus; static int Model; static int Capabilities; /* low level communication timings [nanoseconds] * as these values differ from spec to spec, * we use the worst-case values. */ #define T_CYCLE 1000 /* Enable cycle time */ #define T_PW 450 /* Enable pulse width */ #define T_AS 60 /* Address setup time */ #define T_H 40 /* Data hold time */ #define T_AH 20 /* Address hold time */ /* HD44780 execution timings [microseconds] * as these values differ from spec to spec, * we use the worst-case values. */ #define T_INIT1 4100 /* first init sequence: 4.1 msec */ #define T_INIT2 100 /* second init sequence: 100 usec */ #define T_EXEC 80 /* normal execution time */ #define T_WRCG 120 /* CG RAM Write */ #define T_CLEAR 2250 /* Clear Display */ static int Bits = 0; static int numControllers = 0; static int allControllers = 0; static int currController = 0; /* size of every single controller */ static int CROWS[4]; static int CCOLS[4]; static unsigned char SIGNAL_RW; static unsigned char SIGNAL_RS; static unsigned char SIGNAL_ENABLE; static unsigned char SIGNAL_ENABLE2; static unsigned char SIGNAL_ENABLE3; static unsigned char SIGNAL_ENABLE4; static unsigned char SIGNAL_BACKLIGHT; static unsigned char SIGNAL_GPO; /* maximum time to wait for the busy-flag (in usec) */ #define MAX_BUSYFLAG_WAIT 10000 /* maximum busy flag errors before falling back to busy-waiting */ #define MAX_BUSYFLAG_ERRORS 20 /* flag for busy-waiting vs. busy flag checking */ static int UseBusy = 0; /* Fixme: GPO's not yet implemented */ static int GPOS; /* static int GPO=0; */ typedef struct { int type; char *name; int capabilities; } MODEL; #define CAP_PARPORT (1<<0) #define CAP_I2C (1<<1) #define CAP_GPO (1<<2) #define CAP_BACKLIGHT (1<<3) #define CAP_BRIGHTNESS (1<<4) #define CAP_BUSY4BIT (1<<5) #define CAP_HD66712 (1<<6) #define CAP_LCM162 (1<<7) #define BUS_PP CAP_PARPORT #define BUS_I2C CAP_I2C static MODEL Models[] = { {0x01, "generic", CAP_PARPORT | CAP_I2C | CAP_GPO | CAP_BACKLIGHT}, {0x02, "Noritake", CAP_PARPORT | CAP_I2C | CAP_GPO | CAP_BRIGHTNESS}, {0x03, "Soekris", CAP_PARPORT | CAP_BUSY4BIT}, {0x04, "HD66712", CAP_PARPORT | CAP_I2C | CAP_GPO | CAP_BACKLIGHT | CAP_HD66712}, {0x05, "LCM-162", CAP_PARPORT | CAP_LCM162}, {0xff, "Unknown", 0} }; /****************************************/ /*** generic functions ***/ /****************************************/ static int (*drv_HD_load) (const char *section); static void (*drv_HD_command) (const unsigned char controller, const unsigned char cmd, const int delay); static void (*drv_HD_data) (const unsigned char controller, const char *string, const int len, const int delay); static void (*drv_HD_stop) (void); /****************************************/ /*** parport dependant functions ***/ /****************************************/ static void drv_HD_PP_busy(const int controller) { static unsigned int errors = 0; unsigned char enable; unsigned char data = 0xFF; unsigned char busymask; unsigned char ctrlmask; unsigned int counter; if (Bits == 8) { busymask = 0x80; } else { /* Since in 4-Bit mode DB0 on the parport is mapped to DB4 on the LCD * (and consequently, DB3 on the partport is mapped to DB7 on the LCD) * we need to listen for DB3 on the parport to go low */ busymask = 0x08; } ctrlmask = 0x08; while (ctrlmask > 0) { if (controller & ctrlmask) { enable = 0; if (ctrlmask & 0x01) enable = SIGNAL_ENABLE; else if (ctrlmask & 0x02) enable = SIGNAL_ENABLE2; else if (ctrlmask & 0x04) enable = SIGNAL_ENABLE3; else if (ctrlmask & 0x08) enable = SIGNAL_ENABLE4; /* set data-lines to input */ drv_generic_parport_direction(1); if (Bits == 8) { /* Set RW, clear RS */ drv_generic_parport_control(SIGNAL_RW | SIGNAL_RS, SIGNAL_RW); } else { drv_generic_parport_data(SIGNAL_RW); } /* Address set-up time */ ndelay(T_AS); /* rise ENABLE */ if (Bits == 8) { drv_generic_parport_control(enable, enable); } else { drv_generic_parport_data(SIGNAL_RW | enable); } counter = 0; while (1) { /* read the busy flag */ data = drv_generic_parport_read(); if ((data & busymask) == 0) { errors = 0; break; } /* make sure we don't wait forever * - but only check after 5 iterations * that way, we won't slow down normal mode * (where we don't need the timeout anyway) */ counter++; if (counter >= 5) { struct timeval now, end; if (counter == 5) { /* determine the time when the timeout has expired */ gettimeofday(&end, NULL); end.tv_usec += MAX_BUSYFLAG_WAIT; while (end.tv_usec > 1000000) { end.tv_usec -= 1000000; end.tv_sec++; } } /* get the current time */ gettimeofday(&now, NULL); if (now.tv_sec == end.tv_sec ? now.tv_usec >= end.tv_usec : now.tv_sec >= end.tv_sec) { error("%s: timeout waiting for busy flag on controller %x (%x)", Name, ctrlmask, data); if (++errors >= MAX_BUSYFLAG_ERRORS) { error("%s: too many busy flag failures, turning off busy flag checking.", Name); UseBusy = 0; } break; } } } /* RS=low, RW=low, EN=low */ if (Bits == 8) { /* Lower EN */ drv_generic_parport_control(enable, 0); /* Address hold time */ ndelay(T_AH); drv_generic_parport_control(SIGNAL_RW | SIGNAL_RS, 0); } else { /* Lower EN */ drv_generic_parport_data(SIGNAL_RW); ndelay(T_AH); drv_generic_parport_data(0); } /* set data-lines to output */ drv_generic_parport_direction(0); } ctrlmask >>= 1; } } static void drv_HD_PP_nibble(const unsigned char controller, const unsigned char nibble) { unsigned char enable; /* enable signal: 'controller' is a bitmask */ /* bit n .. send to controller #n */ /* so we can send a byte to more controllers at the same time! */ enable = 0; if (controller & 0x01) enable |= SIGNAL_ENABLE; if (controller & 0x02) enable |= SIGNAL_ENABLE2; if (controller & 0x04) enable |= SIGNAL_ENABLE3; if (controller & 0x08) enable |= SIGNAL_ENABLE4; /* clear ENABLE */ /* put data on DB1..DB4 */ /* nibble already contains RS bit! */ drv_generic_parport_data(nibble); /* Address set-up time */ ndelay(T_AS); /* rise ENABLE */ drv_generic_parport_data(nibble | enable); /* Enable pulse width */ ndelay(T_PW); /* lower ENABLE */ drv_generic_parport_data(nibble); } static void drv_HD_PP_byte(const unsigned char controller, const unsigned char data, const unsigned char RS) { /* send high nibble of the data */ drv_HD_PP_nibble(controller, ((data >> 4) & 0x0f) | RS); /* Make sure we honour T_CYCLE */ ndelay(T_CYCLE - T_AS - T_PW); /* send low nibble of the data */ drv_HD_PP_nibble(controller, (data & 0x0f) | RS); } static void drv_HD_PP_command(const unsigned char controller, const unsigned char cmd, const int delay) { unsigned char enable; if (UseBusy) drv_HD_PP_busy(controller); if (Bits == 8) { /* enable signal: 'controller' is a bitmask */ /* bit n .. send to controller #n */ /* so we can send a byte to more controllers at the same time! */ enable = 0; if (controller & 0x01) enable |= SIGNAL_ENABLE; if (controller & 0x02) enable |= SIGNAL_ENABLE2; if (controller & 0x04) enable |= SIGNAL_ENABLE3; if (controller & 0x08) enable |= SIGNAL_ENABLE4; /* put data on DB1..DB8 */ drv_generic_parport_data(cmd); /* clear RW and RS */ drv_generic_parport_control(SIGNAL_RW | SIGNAL_RS, 0); /* Address set-up time */ ndelay(T_AS); /* send command */ drv_generic_parport_toggle(enable, 1, T_PW); } else { drv_HD_PP_byte(controller, cmd, 0); } /* wait for command completion */ if (!UseBusy) udelay(delay); } static void drv_HD_PP_data(const unsigned char controller, const char *string, const int len, const int delay) { int l = len; unsigned char enable; /* sanity check */ if (len <= 0) return; if (Bits == 8) { /* enable signal: 'controller' is a bitmask */ /* bit n .. send to controller #n */ /* so we can send a byte to more controllers at the same time! */ enable = 0; if (controller & 0x01) enable |= SIGNAL_ENABLE; if (controller & 0x02) enable |= SIGNAL_ENABLE2; if (controller & 0x04) enable |= SIGNAL_ENABLE3; if (controller & 0x08) enable |= SIGNAL_ENABLE4; if (!UseBusy) { /* clear RW, set RS */ drv_generic_parport_control(SIGNAL_RW | SIGNAL_RS, SIGNAL_RS); /* Address set-up time */ ndelay(T_AS); } while (l--) { if (UseBusy) { drv_HD_PP_busy(controller); /* clear RW, set RS */ drv_generic_parport_control(SIGNAL_RW | SIGNAL_RS, SIGNAL_RS); /* Address set-up time */ ndelay(T_AS); } /* put data on DB1..DB8 */ drv_generic_parport_data(*(string++)); /* send command */ drv_generic_parport_toggle(enable, 1, T_PW); /* wait for command completion */ if (!UseBusy) udelay(delay); } } else { /* 4 bit mode */ while (l--) { if (UseBusy) drv_HD_PP_busy(controller); /* send data with RS enabled */ drv_HD_PP_byte(controller, *(string++), SIGNAL_RS); /* wait for command completion */ if (!UseBusy) udelay(delay); } } } static int drv_HD_PP_load(const char *section) { if (cfg_number(section, "Bits", 8, 4, 8, &Bits) < 0) return -1; if (Bits != 4 && Bits != 8) { error("%s: bad %s.Bits '%d' from %s, should be '4' or '8'", Name, section, Bits, cfg_source()); return -1; } /* LCM-162 only supports 8-bit-mode */ if (Capabilities & CAP_LCM162 && Bits != 8) { error("%s: Model '%s' does not support %d bit mode!", Name, Models[Model].name, Bits); Bits = 8; } info("%s: using %d bit mode", Name, Bits); if (drv_generic_parport_open(section, Name) != 0) { error("%s: could not initialize parallel port!", Name); return -1; } /* Soft-Wiring */ if (Capabilities & CAP_LCM162) { /* the LCM-162 is hardwired */ if ((SIGNAL_RS = drv_generic_parport_hardwire_ctrl("RS", "SLCTIN")) == 0xff) return -1; if ((SIGNAL_RW = drv_generic_parport_hardwire_ctrl("RW", "INIT")) == 0xff) return -1; if ((SIGNAL_ENABLE = drv_generic_parport_hardwire_ctrl("ENABLE", "AUTOFD")) == 0xff) return -1; if ((SIGNAL_ENABLE2 = drv_generic_parport_hardwire_ctrl("ENABLE2", "GND")) == 0xff) return -1; if ((SIGNAL_ENABLE3 = drv_generic_parport_hardwire_ctrl("ENABLE3", "GND")) == 0xff) return -1; if ((SIGNAL_ENABLE4 = drv_generic_parport_hardwire_ctrl("ENABLE4", "GND")) == 0xff) return -1; if ((SIGNAL_BACKLIGHT = drv_generic_parport_hardwire_ctrl("BACKLIGHT", "GND")) == 0xff) return -1; if ((SIGNAL_GPO = drv_generic_parport_hardwire_ctrl("GPO", "GND")) == 0xff) return -1; } else { if (Bits == 8) { if ((SIGNAL_RS = drv_generic_parport_wire_ctrl("RS", "AUTOFD")) == 0xff) return -1; if ((SIGNAL_RW = drv_generic_parport_wire_ctrl("RW", "GND")) == 0xff) return -1; if ((SIGNAL_ENABLE = drv_generic_parport_wire_ctrl("ENABLE", "STROBE")) == 0xff) return -1; if ((SIGNAL_ENABLE2 = drv_generic_parport_wire_ctrl("ENABLE2", "GND")) == 0xff) return -1; if ((SIGNAL_ENABLE3 = drv_generic_parport_wire_ctrl("ENABLE3", "GND")) == 0xff) return -1; if ((SIGNAL_ENABLE4 = drv_generic_parport_wire_ctrl("ENABLE4", "GND")) == 0xff) return -1; } else { if ((SIGNAL_RS = drv_generic_parport_wire_data("RS", "DB4")) == 0xff) return -1; if ((SIGNAL_RW = drv_generic_parport_wire_data("RW", "DB5")) == 0xff) return -1; if ((SIGNAL_ENABLE = drv_generic_parport_wire_data("ENABLE", "DB6")) == 0xff) return -1; if ((SIGNAL_ENABLE2 = drv_generic_parport_wire_data("ENABLE2", "GND")) == 0xff) return -1; if ((SIGNAL_ENABLE3 = drv_generic_parport_wire_data("ENABLE3", "GND")) == 0xff) return -1; if ((SIGNAL_ENABLE4 = drv_generic_parport_wire_data("ENABLE4", "GND")) == 0xff) return -1; } /* backlight and GPO are always control signals */ if ((SIGNAL_BACKLIGHT = drv_generic_parport_wire_ctrl("BACKLIGHT", "GND")) == 0xff) return -1; if ((SIGNAL_GPO = drv_generic_parport_wire_ctrl("GPO", "GND")) == 0xff) return -1; } /* clear capabilities if corresponding signal is GND */ if (SIGNAL_BACKLIGHT == 0) { Capabilities &= ~CAP_BACKLIGHT; } if (SIGNAL_GPO == 0) { Capabilities &= ~CAP_GPO; } /* clear all signals */ if (Bits == 8) { drv_generic_parport_control(SIGNAL_RS | SIGNAL_RW | SIGNAL_ENABLE | SIGNAL_ENABLE2 | SIGNAL_ENABLE3 | SIGNAL_ENABLE4 | SIGNAL_BACKLIGHT | SIGNAL_GPO, 0); } else { drv_generic_parport_data(0); } /* set direction: write */ drv_generic_parport_direction(0); /* initialize *all* controllers */ if (Bits == 8) { drv_HD_PP_command(allControllers, 0x30, T_INIT1); /* 8 Bit mode, wait 4.1 ms */ drv_HD_PP_command(allControllers, 0x30, T_INIT2); /* 8 Bit mode, wait 100 us */ drv_HD_PP_command(allControllers, 0x38, T_EXEC); /* 8 Bit mode, 1/16 duty cycle, 5x8 font */ } else { drv_HD_PP_nibble(allControllers, 0x03); udelay(T_INIT1); /* 4 Bit mode, wait 4.1 ms */ drv_HD_PP_nibble(allControllers, 0x03); udelay(T_INIT2); /* 4 Bit mode, wait 100 us */ drv_HD_PP_nibble(allControllers, 0x03); udelay(T_INIT1); /* 4 Bit mode, wait 4.1 ms */ drv_HD_PP_nibble(allControllers, 0x02); udelay(T_INIT2); /* 4 Bit mode, wait 100 us */ drv_HD_PP_command(allControllers, 0x28, T_EXEC); /* 4 Bit mode, 1/16 duty cycle, 5x8 font */ } /* maybe use busy-flag from now on */ /* (we can't use the busy flag during the init sequence) */ cfg_number(section, "UseBusy", 0, 0, 1, &UseBusy); /* make sure we don't use the busy flag with RW wired to GND */ if (UseBusy && !SIGNAL_RW) { error("%s: busy-flag checking is impossible with RW wired to GND!", Name); UseBusy = 0; } /* make sure the display supports busy-flag checking in 4-Bit-Mode */ /* at the moment this is inly possible with Martin Hejl's gpio driver, */ /* which allows to use 4 bits as input and 4 bits as output */ if (UseBusy && Bits == 4 && !(Capabilities & CAP_BUSY4BIT)) { error("%s: Model '%s' does not support busy-flag checking in 4 bit mode", Name, Models[Model].name); UseBusy = 0; } info("%s: %susing busy-flag checking", Name, UseBusy ? "" : "not "); /* The LCM-162 should really use BusyFlag checking */ if (!UseBusy && (Capabilities & CAP_LCM162)) { error("%s: Model '%s' should definitely use busy-flag checking!", Name, Models[Model].name); } return 0; } static void drv_HD_PP_stop(void) { /* clear all signals */ if (Bits == 8) { drv_generic_parport_control(SIGNAL_RS | SIGNAL_RW | SIGNAL_ENABLE | SIGNAL_ENABLE2 | SIGNAL_ENABLE3 | SIGNAL_ENABLE4 | SIGNAL_BACKLIGHT | SIGNAL_GPO, 0); } else { drv_generic_parport_data(0); } drv_generic_parport_close(); } #ifdef WITH_I2C /****************************************/ /*** i2c dependant functions ***/ /****************************************/ /* DISCLAIMER!!!! The following code is WORK IN PROGRESS, since it basicly 'works for us...' (C) 2005 Paul Kamphuis & Luis Correia We have removed all of the delays from this code, as the I2C bus is slow enough... (maximum possible speed is 100KHz only) */ static void drv_HD_I2C_nibble(unsigned char controller, unsigned char nibble) { unsigned char enable; unsigned char command; /* this is actually the first data byte on the PCF8574 */ unsigned char data_block[2]; /* enable signal: 'controller' is a bitmask */ /* bit n .. send to controller #n */ /* so we can send a byte to more controllers at the same time! */ enable = 0; if (controller & 0x01) enable |= SIGNAL_ENABLE; if (controller & 0x02) enable |= SIGNAL_ENABLE2; if (controller & 0x04) enable |= SIGNAL_ENABLE3; if (controller & 0x08) enable |= SIGNAL_ENABLE4; /* The new method Paul Kamphuis has concocted places the 3 needed writes to the I2C device as a single operation, using the 'i2c_smbus_write_block_data' function. These actual writes are performed by putting the nibble along with the 'EN' signal. command = first byte to be written, which contains the nibble (DB0..DB3) data [0] = second byte to be written, which contains the nibble plus the EN signal data [1] = third byte to be written, which contains the nibble (DB0..DB3) Then we write the block as a whole. The main advantage we see is that we do 2 less IOCTL's from our driver. */ command = nibble; data_block[0] = nibble | enable; data_block[1] = nibble; drv_generic_i2c_command(command, data_block, 2); } static void drv_HD_I2C_byte(const unsigned char controller, const unsigned char data) { /* send data with RS enabled */ drv_HD_I2C_nibble(controller, ((data >> 4) & 0x0f) | SIGNAL_RS); drv_HD_I2C_nibble(controller, (data & 0x0f) | SIGNAL_RS); } static void drv_HD_I2C_command(const unsigned char controller, const unsigned char cmd, __attribute__ ((unused)) const int delay) { /* send data with RS disabled */ drv_HD_I2C_nibble(controller, ((cmd >> 4) & 0x0f)); drv_HD_I2C_nibble(controller, ((cmd) & 0x0f)); } static void drv_HD_I2C_data(const unsigned char controller, const char *string, const int len, __attribute__ ((unused)) const int delay) { int l = len; /* sanity check */ if (len <= 0) return; while (l--) { drv_HD_I2C_byte(controller, *(string++)); } } static int drv_HD_I2C_load(const char *section) { if (cfg_number(section, "Bits", 8, 4, 8, &Bits) < 0) return -1; if (Bits != 4) { error("%s: bad %s.Bits '%d' from %s, should be '4'", Name, section, Bits, cfg_source()); return -1; } info("%s: using %d bit mode", Name, Bits); if (drv_generic_i2c_open(section, Name) != 0) { error("%s: could not initialize i2c attached device!", Name); return -1; } if ((SIGNAL_RS = drv_generic_i2c_wire("RS", "DB4")) == 0xff) return -1; if ((SIGNAL_RW = drv_generic_i2c_wire("RW", "DB5")) == 0xff) return -1; if ((SIGNAL_ENABLE = drv_generic_i2c_wire("ENABLE", "DB6")) == 0xff) return -1; if ((SIGNAL_ENABLE2 = drv_generic_i2c_wire("ENABLE2", "GND")) == 0xff) return -1; if ((SIGNAL_GPO = drv_generic_i2c_wire("GPO", "GND")) == 0xff) return -1; /* initialize display */ drv_HD_I2C_nibble(allControllers, 0x03); udelay(T_INIT1); /* 4 Bit mode, wait 4.1 ms */ drv_HD_I2C_nibble(allControllers, 0x03); udelay(T_INIT2); /* 4 Bit mode, wait 100 us */ drv_HD_I2C_nibble(allControllers, 0x03); udelay(T_INIT2); /* 4 Bit mode, wait 4.1 ms */ drv_HD_I2C_nibble(allControllers, 0x02); udelay(T_INIT2); /* 4 Bit mode, wait 100 us */ drv_HD_I2C_command(allControllers, 0x28, T_EXEC); /* 4 Bit mode, 1/16 duty cycle, 5x8 font */ info("%s: I2C initialization done", Name); return 0; } static void drv_HD_I2C_stop(void) { /* clear all signals */ drv_generic_i2c_data(0); /* close port */ drv_generic_i2c_close(); } /* END OF DISCLAIMER */ #endif /* WITH_I2C */ /****************************************/ /*** display dependant functions ***/ /****************************************/ static void drv_HD_clear(void) { drv_HD_command(allControllers, 0x01, T_CLEAR); /* clear *all* displays */ } static int drv_HD_goto(int row, int col) { int pos, controller; /* handle multiple controllers */ for (pos = 0, controller = 0; controller < numControllers; controller++) { pos += CROWS[controller]; if (row < pos) { currController = (1 << controller); break; } row -= CROWS[controller]; } /* column outside of current display's width */ if (col >= CCOLS[controller]) return -1; if (0) { debug("goto: [%d,%d] mask=%d, controller=%d, size:%dx%d", row, col, currController, controller, CROWS[controller], CCOLS[controller]); } /* 16x1 Displays are organized as 8x2 :-( */ if (CCOLS[controller] == 16 && CROWS[controller] == 1 && col > 7) { row++; col -= 8; } if (Capabilities & CAP_HD66712) { /* the HD66712 doesn't have a braindamadged RAM layout */ pos = row * 32 + col; } else { /* 16x4 Controllers use a slightly different layout */ if (CCOLS[controller] == 16 && CROWS[controller] == 4) { pos = (row % 2) * 64 + (row / 2) * 16 + col; } else { pos = (row % 2) * 64 + (row / 2) * 20 + col; } } drv_HD_command(currController, (0x80 | pos), T_EXEC); /* return columns left on current display */ return CCOLS[controller] - col; } static void drv_HD_write(const int row, const int col, const char *data, const int len) { int space = drv_HD_goto(row, col); if (space > 0) { drv_HD_data(currController, data, len > space ? space : len, T_EXEC); } } static void drv_HD_defchar(const int ascii, const unsigned char *matrix) { int i; char buffer[8]; for (i = 0; i < 8; i++) { buffer[i] = matrix[i] & 0x1f; } /* define chars on *all* controllers! */ drv_HD_command(allControllers, 0x40 | 8 * ascii, T_EXEC); drv_HD_data(allControllers, buffer, 8, T_WRCG); } static int drv_HD_backlight(int backlight) { if (!(Capabilities & CAP_BACKLIGHT)) return -1; if (backlight < 0) backlight = 0; if (backlight > 1) backlight = 1; drv_generic_parport_control(SIGNAL_BACKLIGHT, backlight ? SIGNAL_BACKLIGHT : 0); return backlight; } static int drv_HD_brightness(int brightness) { char cmd; if (!(Capabilities & CAP_BRIGHTNESS)) return -1; if (brightness < 0) brightness = 0; if (brightness > 3) brightness = 3; cmd = '0' + brightness; drv_HD_command(allControllers, 0x38, T_EXEC); /* enable function */ drv_HD_data(allControllers, &cmd, 1, T_WRCG); /* set brightness */ return brightness; } /* Fixme: GPO's */ #if 0 static void drv_HD_setGPO(const int bits) { if (Lcd.gpos > 0) { /* put data on DB1..DB8 */ drv_generic_parport_data(bits); /* 74HCT573 set-up time */ ndelay(20); /* send data */ /* 74HCT573 enable pulse width = 24ns */ drv_generic_parport_toggle(SIGNAL_GPO, 1, 230); } } #endif static void drv_HD_LCM162_timer(void __attribute__ ((unused)) * notused) { static unsigned char data = 0x00; /* Bit 3+5 : key number */ /* Bit 6 : key press/release */ unsigned char mask3 = 1 << 3; unsigned char mask5 = 1 << 5; unsigned char mask6 = 1 << 6; unsigned char mask = mask3 | mask5 | mask6; int keynum; int updown; unsigned char temp; temp = drv_generic_parport_status() & mask; if (data != temp) { data = temp; keynum = (data & mask3 ? 1 : 0) + (data & mask5 ? 2 : 0); updown = (data & mask6 ? 1 : 0); debug("key %d press %d", keynum, updown); } } static int drv_HD_start(const char *section, const int quiet) { char *model, *size, *bus; int rows = -1, cols = -1, gpos = -1, i; int size_defined = 0; int size_missing = 0; model = cfg_get(section, "Model", "generic"); if (model != NULL && *model != '\0') { int i; for (i = 0; Models[i].type != 0xff; i++) { if (strcasecmp(Models[i].name, model) == 0) break; } if (Models[i].type == 0xff) { error("%s: %s.Model '%s' is unknown from %s", Name, section, model, cfg_source()); return -1; } Model = i; Capabilities = Models[Model].capabilities; info("%s: using model '%s'", Name, Models[Model].name); } else { error("%s: empty '%s.Model' entry from %s", Name, section, cfg_source()); free(model); return -1; } free(model); bus = cfg_get(section, "Bus", "parport"); if (bus == NULL && *bus == '\0') { error("%s: empty '%s.Bus' entry from %s", Name, section, cfg_source()); free(bus); return -1; } if (strcasecmp(bus, "parport") == 0) { info("%s: using parallel port", Name); Bus = BUS_PP; drv_HD_load = drv_HD_PP_load; drv_HD_command = drv_HD_PP_command; drv_HD_data = drv_HD_PP_data; drv_HD_stop = drv_HD_PP_stop; } else if (strcasecmp(bus, "i2c") == 0) { #ifdef WITH_I2C info("%s: using I2C bus", Name); Bus = BUS_I2C; drv_HD_load = drv_HD_I2C_load; drv_HD_command = drv_HD_I2C_command; drv_HD_data = drv_HD_I2C_data; drv_HD_stop = drv_HD_I2C_stop; #else error("%s: %s.Bus '%s' from %s not available:", Name, section, bus, cfg_source()); error("%s: lcd4linux was compiled without i2c support!", Name); free(bus); return -1; #endif } else { error("%s: bad %s.Bus '%s' from %s, should be 'parport' or 'i2c'", Name, section, bus, cfg_source()); free(bus); return -1; } /* sanity check: Model can use bus */ if (!(Capabilities & Bus)) { error("%s: Model '%s' cannot be used on the %s bus!", Name, Models[Model].name, bus); free(bus); return -1; } free(bus); if (cfg_number(section, "Controllers", 1, 1, 4, (int *) &numControllers) < 0) return -1; info("%s: using %d Controller(s)", Name, numControllers); /* current Controller */ currController = 1; /* Bitmask for *all* Controllers */ allControllers = (1 << numControllers) - 1; DCOLS = 0; DROWS = 0; for (i = 0; i < numControllers; i++) { char key[6]; qprintf(key, sizeof(key), "Size%d", i + 1); size = cfg_get(section, key, NULL); if (size == NULL || *size == '\0') { size_missing++; free(size); continue; } if (sscanf(size, "%dx%d", &cols, &rows) != 2 || rows < 1 || cols < 1) { error("%s: bad %s.%s '%s' from %s", Name, section, key, size, cfg_source()); free(size); return -1; } free(size); CCOLS[i] = cols; CROWS[i] = rows; size_defined++; info("%s: Controller %d: %dx%d", Name, i + 1, cols, rows); /* grow the size */ if (cols > DCOLS) DCOLS = cols; DROWS += rows; } if (size_defined && size_missing) { error("%s: bad %s.Size* definition in %s:", Name, section, cfg_source()); error("%s: either you specify the size for *all* controllers or for none.", Name); return -1; } size = cfg_get(section, "Size", NULL); if (size != NULL && *size != '\0') { if (sscanf(size, "%dx%d", &cols, &rows) != 2 || rows < 1 || cols < 1) { error("%s: bad %s.Size '%s' from %s", Name, section, size, cfg_source()); free(size); return -1; } if (DCOLS == 0 && DROWS == 0) { for (i = 0; i < numControllers; i++) { CCOLS[i] = cols; CROWS[i] = rows / numControllers; DCOLS = CCOLS[i]; DROWS += CROWS[i]; } } if (rows != DROWS || cols != DCOLS) { error("%s: bad %s.Size definition in %s:", Name, section, cfg_source()); error("%s: Size %dx%d should be %dx%d", Name, cols, rows, DCOLS, DROWS); return -1; } } free(size); if (cfg_number(section, "GPOs", 0, 0, 8, &gpos) < 0) return -1; if (gpos > 0 && !(Capabilities & CAP_GPO)) { error("%s: Model '%s' does not support GPO's!", Name, Models[Model].name); gpos = 0; } GPOS = gpos; if (gpos > 0) { info("%s: using %d GPO's", Name, GPOS); } if (drv_HD_load(section) < 0) { error("%s: start display failed!", Name); return -1; } drv_HD_command(allControllers, 0x08, T_EXEC); /* Controller off, cursor off, blink off */ drv_HD_command(allControllers, 0x0c, T_CLEAR); /* Display on, cursor off, blink off, wait 1.64 ms */ drv_HD_command(allControllers, 0x06, T_EXEC); /* curser moves to right, no shift */ if ((Capabilities & CAP_HD66712) && DROWS > 2) { drv_HD_command(allControllers, Bits == 8 ? 0x3c : 0x2c, T_EXEC); /* set extended register enable bit */ drv_HD_command(allControllers, 0x09, T_EXEC); /* set 4-line mode */ drv_HD_command(allControllers, Bits == 8 ? 0x38 : 0x28, T_EXEC); /* clear extended register enable bit */ } drv_HD_clear(); /* clear *all* displays */ drv_HD_command(allControllers, 0x03, T_CLEAR); /* return home */ /* maybe set backlight */ if (Capabilities & CAP_BACKLIGHT) { int backlight; if (cfg_number(section, "Backlight", 0, 0, 1, &backlight) > 0) { info("%s: backlight %s", Name, backlight ? "enabled" : "disabled"); drv_HD_backlight(backlight); } } /* maybe set brightness */ if (Capabilities & CAP_BRIGHTNESS) { int brightness; if (cfg_number(section, "Brightness", 0, 0, 3, &brightness) > 0) { info("%s: brightness level %d", Name, brightness); drv_HD_brightness(brightness); } } /* install keypad polling timer for LCM-162 */ if (Capabilities & CAP_LCM162) { timer_add(drv_HD_LCM162_timer, NULL, 10, 0); } if (!quiet) { char buffer[40]; qprintf(buffer, sizeof(buffer), "%s %dx%d", Name, DCOLS, DROWS); if (drv_generic_text_greet(buffer, NULL)) { sleep(3); drv_HD_clear(); } } return 0; } /****************************************/ /*** plugins ***/ /****************************************/ static void plugin_backlight(RESULT * result, RESULT * arg1) { double backlight; backlight = drv_HD_backlight(R2N(arg1)); SetResult(&result, R_NUMBER, &backlight); } static void plugin_brightness(RESULT * result, RESULT * arg1) { double brightness; brightness = drv_HD_brightness(R2N(arg1)); SetResult(&result, R_NUMBER, &brightness); } /****************************************/ /*** 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_HD_list(void) { int i; for (i = 0; Models[i].type != 0xff; i++) { printf("%s ", Models[i].name); } return 0; } /* initialize driver & display */ int drv_HD_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 = 1; /* number of bytes a goto command requires */ /* real worker functions */ drv_generic_text_real_write = drv_HD_write; drv_generic_text_real_defchar = drv_HD_defchar; /* start display */ if ((ret = drv_HD_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 */ if (Capabilities & CAP_BACKLIGHT) { AddFunction("LCD::backlight", 1, plugin_backlight); } if (Capabilities & CAP_BRIGHTNESS) { AddFunction("LCD::brightness", 1, plugin_brightness); } return 0; } /* close driver & display */ int drv_HD_quit(const int quiet) { info("%s: shutting down.", Name); drv_generic_text_quit(); /* clear display */ drv_HD_clear(); /* say goodbye... */ if (!quiet) { drv_generic_text_greet("goodbye!", NULL); } drv_HD_stop(); return (0); } DRIVER drv_HD44780 = { name:Name, list:drv_HD_list, init:drv_HD_init, quit:drv_HD_quit, };


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