source: npl/mediabox/lcdproc_edwin/src/server/drivers/debug.c

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>
#include <string.h>
#include <sys/errno.h>

#include "../lcd.h"
#include "debug.h"


//////////////////////////////////////////////////////////////////////////
////////////////////// For Debugging Output //////////////////////////////
//////////////////////////////////////////////////////////////////////////

// TODO: somehow allow access to the driver->framebuffer to each
// function...


int debug_init(struct lcd_logical_driver *driver, char *args) 
{
  printf("debug_init(%s)\n", device);
  
  if(!driver->framebuf)
    {
      printf("Allocating frame buffer (%ix%i)\n", lcd.wid, lcd.hgt);
      driver->framebuf = malloc(lcd.wid * lcd.hgt);
    }
  

  if(!driver->framebuf)
    {
      debug_close();
      return -1;
    }

  if(driver->framebuf) printf("Frame buffer: %i\n", (int)driver->framebuf);

  debug_clear();

  driver->clear = debug_clear;
  driver->string = debug_string;
  driver->chr = debug_chr;
  driver->vbar = debug_vbar;
  driver->hbar = debug_hbar;
  driver->init_num = debug_init_num;
  driver->num = debug_num;
  
  driver->init = debug_init;
  driver->close = debug_close;
  driver->flush = debug_flush;
  driver->flush_box = debug_flush_box;
  driver->contrast = debug_contrast;
  driver->backlight = debug_backlight;
  driver->set_char = debug_set_char;
  driver->icon = debug_icon;
  driver->init_vbar = debug_init_vbar;
  driver->init_hbar = debug_init_hbar;
  driver->draw_frame = debug_draw_frame;

  driver->getkey = debug_getkey;
  
  
  return 200;  // 200 is arbitrary.  (must be 1 or more)
}

void debug_close() 
{
// Ack!  This shouldn't crash the program, but does..  Why??


  printf("debug_close()\n");

// This is the line which crashes.
  if(driver->framebuf) free(driver->framebuf);

  if(driver->framebuf) printf("Frame buffer: %i\n", (int)driver->framebuf);
  driver->framebuf = NULL;
//  printf("debug_close() finished\n");
}

/////////////////////////////////////////////////////////////////
// Clears the LCD screen
//
void debug_clear() 
{
  printf("clear()\n");
  
  memset(driver->framebuf, ' ', lcd.wid*lcd.hgt);
  
}


//////////////////////////////////////////////////////////////////
// Flushes all output to the lcd...
//
void debug_flush()
{
  printf("flush()\n");
  
  lcd.draw_frame();
}


/////////////////////////////////////////////////////////////////
// Prints a string on the lcd display, at position (x,y).  The
// upper-left is (1,1), and the lower right should be (20,4).
//
void debug_string(int x, int y, char string[]) 
{

  int i;

  printf("string(%i, %i):%s \n", x, y, string);
  

  x -= 1;  // Convert 1-based coords to 0-based...
  y -= 1;
  
  for(i=0; string[i]; i++)
    {
      driver->framebuf[(y*lcd.wid) + x + i] = string[i];
    }
}

/////////////////////////////////////////////////////////////////
// Prints a character on the lcd display, at position (x,y).  The
// upper-left is (1,1), and the lower right should be (20,4).
//
void debug_chr(int x, int y, char c) 
{
  printf("character(%i, %i):%c\n", x, y, c);
  

  y--;
  x--;
  
  lcd.framebuf[(y*lcd.wid) + x] = c;
}



void debug_contrast(int contrast) 
{
  printf("Contrast: %i\n", contrast);
}

void debug_backlight(int on)
{
  if(on)
  {
    printf("Backlight ON\n");
  }
  else
  {
    printf("Backlight OFF\n");
  }
}

void debug_init_vbar() 
{
  printf("Vertical bars.\n");
}

void debug_init_hbar() 
{
  printf("Horizontal bars.\n");
}

void debug_init_num() 
{
  printf("Big Numbers.\n");
}

void debug_num(int x, int num) 
{
  printf("BigNum(%i, %i)\n", x, num);
}

void debug_set_char(int n, char *dat)
{
  printf("Set Character %i\n", n);
}

/////////////////////////////////////////////////////////////////
// Draws a vertical bar; erases entire column onscreen.
//
void debug_vbar(int x, int len) 
{
  int y;

  printf("Vbar(%i, %i)\n", x, len);
  

  for(y=lcd.hgt; y > 0 && len>0; y--)
    {
      debug_chr(x, y, '|');

      len -= lcd.cellhgt;
    }
  
}

/////////////////////////////////////////////////////////////////
// Draws a horizontal bar to the right.
//
void debug_hbar(int x, int y, int len) 
{
  printf("Hbar(%i, %i, %i)\n", x, y, len);
  
  
  for(; x<lcd.wid && len>0; x++)
    {
      debug_chr(x,y,'-');
      
      len -= lcd.cellwid;
    }
  
}


/////////////////////////////////////////////////////////////////
// Sets character 0 to an icon...
//
void debug_icon(int which, char dest)
{
  printf("Char %i is icon %i\n", dest, which);
}


void debug_flush_box(int lft, int top, int rgt, int bot)
{
  printf("Flush Box(%i, %i)-(%i, %i)\n", lft, top, rgt, bot);
  

  debug_flush();
  
}


void debug_draw_frame(char *dat)
{
  int i, j;

  char out[LCD_MAX_WIDTH];

  printf("draw_frame()\n");
  

  if(!dat) return;

//  printf("Frame (%ix%i): \n%s\n", lcd.wid, lcd.hgt, dat);

  for(i=0; i<lcd.wid; i++)
    {
      out[i] = '-';
    }
  out[lcd.wid] = 0;
  printf("+%s+\n", out);
  
  
  for(i=0; i<lcd.hgt; i++)
    {
      for(j=0; j<lcd.wid; j++)
        {
          out[j] = dat[j+(i*lcd.wid)];
        }
      out[lcd.wid] = 0;
      printf("|%s|\n", out);
      
    }
  
  for(i=0; i<lcd.wid; i++)
    {
      out[i] = '-';
    }
  out[lcd.wid] = 0;
  printf("+%s+\n", out);

}


char debug_getkey()
{
  printf("Trying to grab keypress.\n");
  return 0;
}