392 lines
8.1 KiB
C
392 lines
8.1 KiB
C
/*
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* Copyright (C) 2011 Florian Streibelt <florian@freitagsrunde.org>
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* Licensed under GPL v3 or later
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*
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*/
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#include <stdio.h> /* Standard input/output definitions */
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#include <string.h> /* String function definitions */
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#include <unistd.h> /* UNIX standard function definitions */
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#include <fcntl.h> /* File control definitions */
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#include <errno.h> /* Error number definitions */
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#include <termios.h> /* POSIX terminal control definitions */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdlib.h>
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#include <pthread.h> /* Posix 1003.1c threads */
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#include <signal.h>
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#include <unistd.h>
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int fd;
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int screensaver;
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int brightness = 4;
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int offset = 0;
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char *fifo;
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char *pausemsg = NULL;
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pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
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pthread_t thread1;
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int
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initport (int fd)
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{
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struct termios options;
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// Get the current options for the port...
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tcgetattr (fd, &options);
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// Set the baud rates to 9600...
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cfsetispeed (&options, B9600);
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cfsetospeed (&options, B9600);
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// Enable the receiver and set local mode...
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options.c_cflag |= (CLOCAL | CREAD);
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options.c_cflag &= ~PARENB;
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options.c_cflag &= ~CSTOPB;
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options.c_cflag &= ~CSIZE;
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options.c_cflag |= CS8;
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// Set the new options for the port...
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tcsetattr (fd, TCSANOW, &options);
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return 1;
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}
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//reset the display to defaults
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char display_init[] = { 0x1b, 0x40 };
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//show or hide the cursor
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char display_cursor_off[] = { 0x1f, 0x43, 0x0 };
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char display_cursor_on[] = { 0x1f, 0x43, 0x1 };
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// blink-command:
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// where the last value defines the blink rate,
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// with 0=always on, 255=always off
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char display_on[] = { 0x1f, 0x45, 0x0 };
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char display_off[] = { 0x1f, 0x45, 0xff };
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//Modes for new chars:
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char display_overwrite[] = { 0x1f, 0x01 };
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char display_vscroll[] = { 0x1f, 0x02 };
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char display_hscroll[] = { 0x1f, 0x03 };
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//clear and cursor home
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char display_clear_screen[] = { 0x0c };
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// activate timer display in lower right corner.
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// actual time has to be set via display_set_timer.
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char display_time[] = { 0x1f, 0x55 };
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// configures hour and minutes of the internal clock and
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// displays the time in the lower right corner.
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// turns off when something gets written into the line.
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// two bytes have to follow with hour and minute
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char display_set_timer[] = { 0x1F, 0x54 };
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// various commands for the display:
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// send a command sequence from the heap(!) {sizeof used}
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// only to be used within the macros presented below!
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#define DWC(c) display_write(c,sizeof(c))
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//send a null terminated string:
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#define SEND_TEXT(t) display_write(t,strlen(t))
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//various commands
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#define SEND_DISPLAY_INIT DWC(display_init)
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#define SEND_CURSOR_OFF DWC(display_cursor_off)
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#define SEND_CURSOR_ON DWC(display_cursor_on)
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#define SEND_DEFINE_TIMER DWC(display_set_timer)
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#define SEND_SHOW_TIMER DWC(display_time)
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#define SEND_MODE_OVERWRITE DWC(display_overwrite)
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#define SEND_MODE_VSCROLL DWC(display_vscroll)
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#define SEND_MODE_HSCROLL DWC(display_hscroll)
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#define SEND_DISPLAY_OFF DWC(display_off)
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#define SEND_DISPLAY_ON DWC(display_on)
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#define SEND_CLEAR DWC(display_clear_screen);
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// internal defines.
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#define TIME_BASE 200000
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#define TB_TO_SECS(x) (x*1000000/TIME_BASE)
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#define TIME_CLOCK TB_TO_SECS(5)
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#define TIME_DIM TB_TO_SECS(90)
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#define TIME_OFF TB_TO_SECS(320)
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#define DEVICE "/dev/ttyUSB0"
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// chars per line in our display:
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#define LINELEN 20
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void
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display_write (const void *buf, size_t count)
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{
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pthread_mutex_lock (&mutex1);
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write (fd, buf, count);
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pthread_mutex_unlock (&mutex1);
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}
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void
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display_putstring (char *s)
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{
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screensaver = 0;
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SEND_TEXT (s);
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}
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void
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showtime (void)
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{
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SEND_CURSOR_OFF;
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char c[5] = { 0x1F, 0x54, 0x00, 0x00 };
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time_t timer; // Define the timer
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struct tm *tblock; // Define a structure for time block
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timer = time (NULL);
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tblock = localtime (&timer);
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c[2] = tblock->tm_hour;
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c[3] = tblock->tm_min;
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display_write (&c, 4);
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SEND_MODE_HSCROLL;
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char *msg = "Freitagsrunde 4!";
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display_write (msg, strlen (msg));
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}
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void
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display_dim (short i)
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{
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// return;
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if (i == brightness)
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{
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//printf ("display_dim: would not change brightness. abort.\n");
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return;
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}
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if (i > 0 && i < 5)
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{
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int l = 0;
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char *d;
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if (brightness == 0)
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{
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SEND_CURSOR_OFF;
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// turn display on again
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SEND_DISPLAY_ON;
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SEND_MODE_OVERWRITE;
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char c[4] = { 0x1f, 0x58, 0x04, 0x00 };
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l = 6;
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//c[5]=i;
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d = c;
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}
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else
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{
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//set brightness directly:
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char c[4] = { 0x1f, 0x58, 0x01, 0x00 };
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l = 3;
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c[2] = i;
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d = c;
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//printf ("command mode: %x \n", c[2]);
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}
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display_write (d, l);
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brightness = i;
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}
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else if (i == 0)
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{
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//turn off
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SEND_DISPLAY_OFF;
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brightness = i;
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}
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}
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void *
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rthread (void *args)
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{
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int pipe;
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char pc = ' ';
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char c = ' ';
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while (1)
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{
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pipe = open ("/tmp/display", O_RDONLY);
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int r;
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while ((r = read (pipe, &c, 1)) > 0)
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{
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screensaver = 0;
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display_dim (4);
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if (pc == '\n')
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{
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display_write (&pc, 1);
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}
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if (c != '\n')
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{
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display_write (&c, 1);
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}
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pc = c;
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}
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close (pipe);
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}
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}
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void
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sighandler (int sig)
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{
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pthread_kill (thread1, 0);
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SEND_DISPLAY_INIT;
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SEND_MODE_OVERWRITE;
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SEND_CURSOR_OFF;
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SEND_DISPLAY_OFF;
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close (fd);
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if (fifo)
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{
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unlink (fifo);
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}
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exit (0);
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//signal(sig, sighandler);
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}
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void scrolltext(){
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if (pausemsg){
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char *message = calloc (LINELEN + 1, sizeof (char));
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int spaces=0;
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if (offset<LINELEN){
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spaces = LINELEN-offset; //anzahl spaces im ersten durchgang
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memset(message , ' ', spaces);
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}
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strncpy (message+spaces, pausemsg + offset - LINELEN, LINELEN-spaces);
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offset=(offset + 1) % (strlen(pausemsg)+LINELEN);
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if (offset==0){
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offset=LINELEN;
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}
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int l = strlen (message);
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if (l < LINELEN)
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{
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message = strncat (message, pausemsg, LINELEN - l);
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}
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SEND_TEXT ("\x0b");
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SEND_TEXT (message);
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free (message);
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}
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}
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int
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main (int argc, char **argv)
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{
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char *devnode;
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//TODO: arg parser!
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fifo = strdup ("/tmp/display");
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pausemsg = strdup("Bitte scanne Deine ID-Karte um Dich anzumelden *** ");
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if (argc != 2)
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{
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devnode = strdup (DEVICE);
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printf ("no device specified, using default %s\n", devnode);
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}
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else
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{
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devnode = strdup (argv[1]);
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}
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fd = open (devnode, O_RDWR | O_NOCTTY | O_NDELAY);
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if (fd == -1)
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{
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perror (devnode);
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return 1;
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}
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else
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{
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fcntl (fd, F_SETFL, 0);
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}
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initport (fd);
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//init display, set, vertical scroll, cursor off
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SEND_DISPLAY_INIT;
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SEND_MODE_OVERWRITE;
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SEND_CURSOR_OFF;
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pthread_create (&thread1, NULL, rthread, NULL);
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signal (SIGINT, sighandler);
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if (mkfifo (fifo, S_IRWXU | S_IRWXG | S_IRWXO))
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{
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perror (fifo);
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if (errno != EEXIST && errno != ESPIPE)
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{
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return (1);
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}
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}
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//showtime();
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display_putstring ("Display initialized ");
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display_putstring (fifo);
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sleep (3);
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screensaver = 0;
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offset = 0; // offset for scrolltext in screensaver
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while (1)
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{
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usleep (TIME_BASE);
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if (0 == (screensaver) % TB_TO_SECS (1))
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{
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//one-second event comes HERE:
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printf
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("debug: screensaver: %d time until clock: %d time until dim: %d time until off: %d\n",
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screensaver, TIME_CLOCK - screensaver, TIME_DIM - screensaver,
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TIME_OFF - screensaver);
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}
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//printf ("screensaver = %05d brightness: %d\n", screensaver, brightness);
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if (screensaver < (TIME_CLOCK + TIME_OFF + TIME_DIM + 10)){
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screensaver++;
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}
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if (screensaver == TIME_CLOCK)
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{
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showtime ();
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}
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if (screensaver == TIME_OFF)
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{
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display_dim (0);
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}
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//show a scroll text while the screensaver is active...
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if ((screensaver > (TIME_CLOCK + 10)) && (screensaver < TIME_OFF))
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{
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scrolltext();
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}
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//after some more seconds of inactivity dim display and finally turn off
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if ((screensaver > TIME_DIM) && (brightness > 1))
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{
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//printf ("dimming\n");
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display_dim (brightness - 1);
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}
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}
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//you'll never get here
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close (fd);
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return 0;
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}
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