source: npl/mediabox/lcdproc_edwin/src/server/drivers/drv_base.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 "drv_base.h"


//////////////////////////////////////////////////////////////////////////
////////////////////// Base "class" to derive from ///////////////////////
//////////////////////////////////////////////////////////////////////////

lcd_logical_driver *drv_base;

// TODO: Get lcd.framebuf to properly work as whatever driver is running...


////////////////////////////////////////////////////////////
// init() should set up any device-specific stuff, and
// point all the function pointers.
int drv_base_init(struct lcd_logical_driver *driver, char *args) 
{
//  printf("drv_base_init()\n");

   drv_base = driver;
   
  driver->wid = 20;
  driver->hgt = 4;

  // You must use driver->framebuf here, but may use lcd.framebuf later.
  if(!driver->framebuf) 
    driver->framebuf = malloc(driver->wid * driver->hgt);

  if(!driver->framebuf)
    {
      drv_base_close();
      return -1;
    }
// Debugging...
//  if(lcd.framebuf) printf("Frame buffer: %i\n", (int)lcd.framebuf);

  memset(driver->framebuf, ' ', driver->wid*driver->hgt);
//  drv_base_clear();

  driver->cellwid = 5;
  driver->cellhgt = 8;
  
  driver->clear = drv_base_clear;
  driver->string = drv_base_string;
  driver->chr = drv_base_chr;
  driver->vbar = drv_base_vbar;
  driver->init_vbar = drv_base_init_vbar;
  driver->hbar = drv_base_hbar;
  driver->init_hbar = drv_base_init_hbar;
  driver->num = drv_base_num;
  driver->init_num = drv_base_init_num;
  
  driver->init = drv_base_init;
  driver->close = drv_base_close;
  driver->flush = drv_base_flush;
  driver->flush_box = drv_base_flush_box;
  driver->contrast = drv_base_contrast;
  driver->backlight = drv_base_backlight;
  driver->set_char = drv_base_set_char;
  driver->icon = drv_base_icon;
  driver->draw_frame = drv_base_draw_frame;

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


// Below here, you may use either lcd.framebuf or driver->framebuf..
// lcd.framebuf will be set to the appropriate buffer before calling
// your driver.

void drv_base_close() 
{
  if(lcd.framebuf != NULL) free(lcd.framebuf);

  lcd.framebuf = NULL;
}

/////////////////////////////////////////////////////////////////
// Clears the LCD screen
//
void drv_base_clear() 
{
  memset(lcd.framebuf, ' ', lcd.wid*lcd.hgt);
  
}


//////////////////////////////////////////////////////////////////
// Flushes all output to the lcd...
//
void drv_base_flush()
{
   //lcd.draw_frame(lcd.framebuf);
}


/////////////////////////////////////////////////////////////////
// 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 drv_base_string(int x, int y, char string[]) 
{
  int i;

  x -= 1;  // Convert 1-based coords to 0-based...
  y -= 1;
  
  for(i=0; string[i]; i++)
  {
     // Check for buffer overflows...
     if((y*lcd.wid) + x + i  >  (lcd.wid*lcd.hgt)) break;
     lcd.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 drv_base_chr(int x, int y, char c) 
{
  y--;
  x--;

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


//////////////////////////////////////////////////////////////////////
// Sets the contrast of the display.  Value is 0-255, where 140 is
// what I consider "just right".
//
int drv_base_contrast(int contrast) 
{
//  printf("Contrast: %i\n", contrast);
  return -1;
}

//////////////////////////////////////////////////////////////////////
// Turns the lcd backlight on or off...
//
void drv_base_backlight(int on)
{
  /*
  if(on)
  {
    printf("Backlight ON\n");
  }
  else
  {
    printf("Backlight OFF\n");
  }
  */
}

//////////////////////////////////////////////////////////////////////
// Tells the driver to get ready for vertical bargraphs.
//
void drv_base_init_vbar() 
{
//  printf("Vertical bars.\n");
}

//////////////////////////////////////////////////////////////////////
// Tells the driver to get ready for horizontal bargraphs.
//
void drv_base_init_hbar() 
{
//  printf("Horizontal bars.\n");
}

//////////////////////////////////////////////////////////////////////
// Tells the driver to get ready for big numbers, if possible.
//
void drv_base_init_num() 
{
//  printf("Big Numbers.\n");
}

//////////////////////////////////////////////////////////////////////
// Draws a big (4-row) number.
//
void drv_base_num(int x, int num) 
{
//  printf("BigNum(%i, %i)\n", x, num);
}

//////////////////////////////////////////////////////////////////////
// Changes the font data of character n.
//
void drv_base_set_char(int n, char *dat)
{
//  printf("Set Character %i\n", n);
}

/////////////////////////////////////////////////////////////////
// Draws a vertical bar, from the bottom of the screen up.
//
void drv_base_vbar(int x, int len) 
{
  int y;
  for(y=lcd.hgt; y > 0 && len>0; y--)
    {
      drv_base_chr(x, y, '|');

      len -= lcd.cellhgt;
    }
  
}

/////////////////////////////////////////////////////////////////
// Draws a horizontal bar to the right.
//
void drv_base_hbar(int x, int y, int len) 
{
  for(; x<=lcd.wid && len>0; x++)
    {
      drv_base_chr(x,y,'-');
      
      len -= lcd.cellwid;
    }
  
}


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


//////////////////////////////////////////////////////////////////////
// Send a rectangular area to the display.
//
// I've just called drv_base_flush() because there's not much point yet
// in flushing less than the entire framebuffer.
//
void drv_base_flush_box(int lft, int top, int rgt, int bot)
{
   //drv_base_flush();
  
}

//////////////////////////////////////////////////////////////////////
// Draws the framebuffer on the display.
//
// The commented-out code is from the text driver.
//
void drv_base_draw_frame(char *dat)
{
/*
   int i, j;

   char out[LCD_MAX_WIDTH];

   if(!dat) return;

   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);
*/
}


//////////////////////////////////////////////////////////////////////
// Tries to read a character from an input device...
//
// Return 0 for "nothing available".
//
char drv_base_getkey()
{
  return 0;
}