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|
/* $Id$
* $URL$
*
* sample lcd4linux driver
*
* Copyright (C) 2005 Michael Reinelt <michael@reinelt.co.at>
* Copyright (C) 2005, 2006, 2007 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_Sample
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "debug.h"
#include "cfg.h"
#include "qprintf.h"
#include "udelay.h"
#include "plugin.h"
#include "widget.h"
#include "widget_text.h"
#include "widget_icon.h"
#include "widget_bar.h"
#include "drv.h"
/* text mode display? */
#include "drv_generic_text.h"
/* graphic display? */
#include "drv_generic_graphic.h"
/* GPO's? */
#include "drv_generic_gpio.h"
/* serial port? */
#include "drv_generic_serial.h"
/* parallel port? */
#include "drv_generic_parport.h"
/* i2c bus? */
#ifdef WITH_I2C
#include "drv_generic_i2c.h"
#endif
static char Name[] = "Sample";
/* for parallel port displays only */
/* use whatever lines you need */
static unsigned char SIGNAL_RS;
static unsigned char SIGNAL_EX;
/****************************************/
/*** hardware dependant functions ***/
/****************************************/
/* low-level parallel port stuff */
/* example for sending one byte over the wire */
static void drv_Sample_bang(const unsigned int data)
{
/* put data on DB1..DB8 */
drv_generic_parport_data(data & 0xff);
/* set/clear some signals */
drv_generic_parport_control(SIGNAL_RS, SIGNAL_RS);
/* data setup time (e.g. 200 ns) */
ndelay(200);
/* send byte */
/* signal pulse width 500ns */
drv_generic_parport_toggle(SIGNAL_EX, 1, 500);
/* wait for command completion (e.g. 100 us) */
udelay(100);
}
static int drv_Sample_open(const char *section)
{
/* open serial port */
/* don't mind about device, speed and stuff, this function will take care of */
if (drv_generic_serial_open(section, Name, 0) < 0)
return -1;
/* opening the parallel port is a bit more tricky: */
/* you have to do all the bit-banging yourself... */
if (drv_generic_parport_open(section, Name) != 0) {
error("%s: could not initialize parallel port!", Name);
return -1;
}
/* read the wiring from config */
if ((SIGNAL_EX = drv_generic_parport_wire_ctrl("EX", "STROBE")) == 0xff)
return -1;
if ((SIGNAL_RS = drv_generic_parport_wire_ctrl("RS", "INIT")) == 0xff)
return -1;
/* clear all signals */
drv_generic_parport_control(SIGNAL_EX | SIGNAL_RS, 0);
/* set direction: write */
drv_generic_parport_direction(0);
return 0;
}
static int drv_Sample_close(void)
{
/* close whatever port you've opened */
drv_generic_parport_close();
drv_generic_serial_close();
return 0;
}
/* dummy function that sends something to the display */
static void drv_Sample_send(const char *data, const unsigned int len)
{
unsigned int i;
/* send data to the serial port is easy... */
drv_generic_serial_write(data, len);
/* sending data to the parallel port is a bit more tricky... */
for (i = 0; i < len; i++) {
drv_Sample_bang(*data++);
}
}
/* text mode displays only */
static void drv_Sample_clear(void)
{
char cmd[1];
/* do whatever is necessary to clear the display */
/* assume 0x01 to be a 'clear display' command */
cmd[0] = 0x01;
drv_Sample_send(cmd, 1);
}
/* text mode displays only */
static void drv_Sample_write(const int row, const int col, const char *data, int len)
{
char cmd[3];
/* do the cursor positioning here */
/* assume 0x02 to be a 'Goto' command */
cmd[0] = 0x02;
cmd[1] = row;
cmd[2] = col;
drv_Sample_send(cmd, 3);
/* send string to the display */
drv_Sample_send(data, len);
}
/* text mode displays only */
static void drv_Sample_defchar(const int ascii, const unsigned char *matrix)
{
char cmd[10];
int i;
/* call the 'define character' function */
/* assume 0x03 to be the 'defchar' command */
cmd[0] = 0x03;
cmd[1] = ascii;
/* send bitmap to the display */
for (i = 0; i < 8; i++) {
cmd[i + 2] = *matrix++;
}
drv_Sample_send(cmd, 10);
}
/* for graphic displays only */
static void drv_Sample_blit(const int row, const int col, const int height, const int width)
{
int r, c;
for (r = row; r < row + height; r++) {
for (c = col; c < col + width; c++) {
/* drv_generic_graphic_black() returns 1 if pixel is black */
/* drv_generic_graphic_gray() returns a gray value 0..255 */
/* drv_generic_graphic_rgb() returns a RGB color */
if (drv_generic_graphic_black(r, c)) {
/* set bit */
} else {
/* clear bit */
}
}
}
}
/* remove unless you have GPO's */
static int drv_Sample_GPO(const int num, const int val)
{
char cmd[4];
/* assume 0x42 to be the 'GPO' command */
cmd[0] = 0x42;
cmd[1] = num;
cmd[2] = (val > 0) ? 1 : 0;
drv_Sample_send(cmd, 3);
return 0;
}
/* example function used in a plugin */
static int drv_Sample_contrast(int contrast)
{
char cmd[2];
/* adjust limits according to the display */
if (contrast < 0)
contrast = 0;
if (contrast > 255)
contrast = 255;
/* call a 'contrast' function */
/* assume 0x04 to be the 'set contrast' command */
cmd[0] = 0x04;
cmd[1] = contrast;
drv_Sample_send(cmd, 2);
return contrast;
}
/* start text mode display */
static int drv_Sample_start(const char *section)
{
int contrast;
int rows = -1, cols = -1;
char *s;
char cmd[1];
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;
/* number of GPO's; remove if you don't have them */
GPOS = 8;
/* open communication with the display */
if (drv_Sample_open(section) < 0) {
return -1;
}
/* reset & initialize display */
/* assume 0x00 to be a 'reset' command */
cmd[0] = 0x00;
drv_Sample_send(cmd, 0);
if (cfg_number(section, "Contrast", 0, 0, 255, &contrast) > 0) {
drv_Sample_contrast(contrast);
}
drv_Sample_clear(); /* clear display */
return 0;
}
/* start graphic display */
static int drv_Sample_start2(const char *section)
{
char *s;
char cmd[1];
int contrast;
/* read display size from config */
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;
}
DROWS = -1;
DCOLS = -1;
if (sscanf(s, "%dx%d", &DCOLS, &DROWS) != 2 || DCOLS < 1 || DROWS < 1) {
error("%s: bad Size '%s' from %s", Name, s, cfg_source());
return -1;
}
s = cfg_get(section, "Font", "6x8");
if (s == NULL || *s == '\0') {
error("%s: no '%s.Font' entry from %s", Name, section, cfg_source());
return -1;
}
XRES = -1;
YRES = -1;
if (sscanf(s, "%dx%d", &XRES, &YRES) != 2 || XRES < 1 || YRES < 1) {
error("%s: bad Font '%s' from %s", Name, s, cfg_source());
return -1;
}
/* Fixme: provider other fonts someday... */
if (XRES != 6 && YRES != 8) {
error("%s: bad Font '%s' from %s (only 6x8 at the moment)", Name, s, cfg_source());
return -1;
}
/* you surely want to allocate a framebuffer or something... */
/* open communication with the display */
if (drv_Sample_open(section) < 0) {
return -1;
}
/* reset & initialize display */
/* assume 0x00 to be a 'reset' command */
cmd[0] = 0x00;
drv_Sample_send(cmd, 1);
if (cfg_number(section, "Contrast", 0, 0, 255, &contrast) > 0) {
drv_Sample_contrast(contrast);
}
return 0;
}
/****************************************/
/*** plugins ***/
/****************************************/
static void plugin_contrast(RESULT * result, RESULT * arg1)
{
double contrast;
contrast = drv_Sample_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) */
/* using drv_generic_gpio_draw(W) */
/****************************************/
/*** exported functions ***/
/****************************************/
/* list models */
int drv_Sample_list(void)
{
printf("Sample driver");
return 0;
}
/* initialize driver & display */
/* use this function for a text display */
int drv_Sample_init(const char *section, const int quiet)
{
WIDGET_CLASS wc;
int ret;
info("%s: %s", Name, "$Rev$");
/* 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_Sample_write;
drv_generic_text_real_defchar = drv_Sample_defchar;
/* remove unless you have GPO's */
drv_generic_gpio_real_set = drv_Sample_GPO;
/* start display */
if ((ret = drv_Sample_start(section)) != 0)
return ret;
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_Sample_clear();
}
}
/* 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 */
drv_generic_text_bar_add_segment(0, 0, 255, 32); /* ASCII 32 = blank */
/* initialize generic GPIO driver */
/* remove unless you have GPO's */
if ((ret = drv_generic_gpio_init(section, Name)) != 0)
return ret;
/* 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;
}
/* initialize driver & display */
/* use this function for a graphic display */
int drv_Sample_init2(const char *section, const int quiet)
{
int ret;
/* real worker functions */
drv_generic_graphic_real_blit = drv_Sample_blit;
/* remove unless you have GPO's */
drv_generic_gpio_real_set = drv_Sample_GPO;
/* start display */
if ((ret = drv_Sample_start2(section)) != 0)
return ret;
/* initialize generic graphic driver */
if ((ret = drv_generic_graphic_init(section, Name)) != 0)
return ret;
if (!quiet) {
char buffer[40];
qprintf(buffer, sizeof(buffer), "%s %dx%d", Name, DCOLS, DROWS);
if (drv_generic_graphic_greet(buffer, NULL)) {
sleep(3);
drv_generic_graphic_clear();
}
}
/* register plugins */
AddFunction("LCD::contrast", 1, plugin_contrast);
return 0;
}
/* close driver & display */
/* use this function for a text display */
int drv_Sample_quit(const int quiet)
{
info("%s: shutting down.", Name);
drv_generic_text_quit();
/* remove unless you have GPO's */
drv_generic_gpio_quit();
/* clear display */
drv_Sample_clear();
/* say goodbye... */
if (!quiet) {
drv_generic_text_greet("goodbye!", NULL);
}
debug("closing connection");
drv_Sample_close();
return (0);
}
/* close driver & display */
/* use this function for a graphic display */
int drv_Sample_quit2(const int quiet)
{
info("%s: shutting down.", Name);
/* clear display */
drv_generic_graphic_clear();
/* remove unless you have GPO's */
drv_generic_gpio_quit();
/* say goodbye... */
if (!quiet) {
drv_generic_graphic_greet("goodbye!", NULL);
}
drv_generic_graphic_quit();
debug("closing connection");
drv_Sample_close();
return (0);
}
/* use this one for a text display */
DRIVER drv_Sample = {
.name = Name,
.list = drv_Sample_list,
.init = drv_Sample_init,
.quit = drv_Sample_quit,
};
/* use this one for a graphic display */
DRIVER drv_Sample2 = {
.name = Name,
.list = drv_Sample_list,
.init = drv_Sample_init2,
.quit = drv_Sample_quit2,
};
|