//*****************************************************************************
//	Pixel
//  Input:	Zeile,Spalte,Set/Clear
//	Output:	-
//*****************************************************************************
void glcd_PIXEL(unsigned int ui_x,unsigned int ui_y, unsigned char uc_show1)
{
unsigned int ui_addr;       // memory address of byte containing pixel to write
unsigned int ui_xn;
unsigned int ui_pixels;

   if ((ui_x >= glcd_XMAX) || (ui_y >= glcd_YMAX)) return;

   if (glcd_BYTES_PER_ROW > 30) ui_pixels = 6; else ui_pixels = 8;

   ui_addr = ui_y * glcd_BYTES_PER_ROW * ui_pixels + ui_x; //Pixel, was veraendert werden soll

   ui_xn = ui_addr;
   ui_addr = ui_addr /ui_pixels;       	//n-tes Byte ermitteln
   ui_xn= ui_xn - ui_addr * ui_pixels; 	//Bitposition ermitteln
   ui_addr = ui_addr + G_BASE;		//RAM Adresse ermitteln

   glcd_set_address(ui_addr);   // set LCD addr. pointer

   if (uc_show1) glcd_cput(0xf8 | ((ui_pixels -1) - ui_xn %8));  //entsprechende Bitposition setzen
            else glcd_cput(0xf0 | ((ui_pixels -1) - ui_xn %8));  //oder ruecksetzen	
}


void glcd_setpixel(int column, int row)  // set single pixel in 240x64 array
{
   glcd_PIXEL(column,row,1);
}


void glcd_clrpixel(int column, int row)  // set single pixel in 240x64 array
{
   glcd_PIXEL(column,row,0);
}




//*****************************************************************************
//	GetPixel
//  	Input:	x,y
//	Output:	0,1
//*****************************************************************************
unsigned char glcd_GETPIXEL(unsigned int ui_x, unsigned int ui_y)
{
unsigned int ui_pixeldata;	
unsigned int ui_addr;       // memory address of byte containing pixel to write
unsigned int ui_pixels;
unsigned int ui_xn;

   if ((ui_x >= glcd_XMAX) || (ui_y >= glcd_YMAX)) return(0);

   if (glcd_BYTES_PER_ROW > 30) ui_pixels = 6; else ui_pixels = 8;

   ui_addr = ui_y * linechars * ui_pixels + ui_x;
   ui_xn = ui_addr;
   ui_addr = ui_addr /ui_pixels;
   ui_xn= ui_xn - ui_addr * ui_pixels;
   ui_addr = ui_addr + G_BASE;
   glcd_set_address(ui_addr);   // set LCD addr. pointer

   glcd_cput(0xE0);   
   ui_pixeldata = glcd_dget();
   return(((ui_pixeldata & 0x00FF) >> ((ui_pixels -1) - ui_xn %8)) & 0x01);
}