void lcd_writechar(unsigned char b)
{	unsigned char i,j,c;
	if (lcd_xpos+5>=160)
	{	lcd_xpos=0;
		if (lcd_ypos+7>=80)
			lcd_ypos=0;
	}
	for (i=0; i<8; i++)
	{	c=pgm_read_byte(&font[b][i]);
		for (j=0; j<6; j++)
		{	if (c&(32>>j))
				lcd_setpixel(lcd_xpos+j,lcd_ypos+i);
			else
				lcd_clrpixel(lcd_xpos+j,lcd_ypos+i);
		}
	}
	lcd_xpos+=6;
}