求NIOS在LCD的函数

[此贴子已经被作者于2007-3-29 20:25:30编辑过]

nios的免 费ip中只有16207的驱动。

在nios 的commponent中的src中，你包含了头文件后便可以调用了。

altera_avalon_lcd_16207.c

。。。。。。。。就是lcd函数。如果型号不对，你可以自己写，不难！

节选如下

static void lcd_write_data(alt_LCD_16207_dev * dev, unsigned char data)
{
  unsigned int base = dev->base;

  /* We impose a timeout on the driver in case the LCD panel isn't connected.
   * The first time we call this function the timeout is approx 25ms
   * (assuming 5 cycles per loop and a 200MHz clock).  Obviously systems
   * with slower clocks, or debug builds, or slower memory will take longer.
   */
  int i = 1000000;

  /* Don't bother if the LCD panel didn't work before */
  if (dev->broken)
    return;

  /* Wait until LCD isn't busy. */
  while (IORD_ALTERA_AVALON_LCD_16207_STATUS(base) & ALTERA_AVALON_LCD_16207_STATUS_BUSY_MSK)
    if (--i == 0)
    {
      dev->broken = 1;
      return;
    }

  /* Despite what it says in the datasheet, the LCD isn't ready to accept
   * a write immediately after it returns BUSY=0.  Wait for 100us more.
   */
  usleep(100);

  IOWR_ALTERA_AVALON_LCD_16207_DATA(base, data);

  dev->address++;
}

/* --------------------------------------------------------------------- */

static void lcd_clear_screen(alt_LCD_16207_dev * dev)
{
  int y;

  lcd_write_command(dev, LCD_CMD_CLEAR);

  dev->x = 0;
  dev->y = 0;
  dev->address = 0;

  for (y = 0 ; y < ALT_LCD_HEIGHT ; y++)
  {
    memset(dev->line[y].data, ' ', sizeof(dev->line[0].data));
    memset(dev->line[y].visible, ' ', sizeof(dev->line[0].visible));
    dev->line[y].width = 0;
  }
}

/* --------------------------------------------------------------------- */

static void lcd_repaint_screen(alt_LCD_16207_dev * dev)
{
  int y, x;

  /* scrollpos controls how much the lines have scrolled round.  The speed
   * each line scrolls at is controlled by its speed variable - while
   * scrolline lines will wrap at the position set by width
   */

  int scrollpos = dev->scrollpos;

  for (y = 0 ; y < ALT_LCD_HEIGHT ; y++)
  {
    int width  = dev->line[y].width;
    int offset = (scrollpos * dev->line[y].speed) >> 8;
    if (offset >= width)
      offset = 0;

    for (x = 0 ; x < ALT_LCD_WIDTH ; x++)
    {
      char c = dev->line[y].data[(x + offset) % width];

      /* Writing data takes 40us, so don't do it unless required */
      if (dev->line[y].visible[x] != c)
      {
        unsigned char address = x + colstart[y];

        if (address != dev->address)
        {
          lcd_write_command(dev, LCD_CMD_WRITE_DATA | address);
          dev->address = address;
        }

        lcd_write_data(dev, c);
        dev->line[y].visible[x] = c;
      }
    }
  }
}

/* --------------------------------------------------------------------- */

static void lcd_scroll_up(alt_LCD_16207_dev * dev)
{
  int y;

  for (y = 0 ; y < ALT_LCD_HEIGHT ; y++)
  {
    if (y < ALT_LCD_HEIGHT-1)
      memcpy(dev->line[y].data, dev->line[y+1].data, ALT_LCD_VIRTUAL_WIDTH);
    else
      memset(dev->line[y].data, ' ', ALT_LCD_VIRTUAL_WIDTH);
  }

  dev->y--;
}

/* --------------------------------------------------------------------- */

static void lcd_handle_escape(alt_LCD_16207_dev * dev, char c)
{

斑竹 有没有用C写的在液晶显示屏上显示汉字的函数？

还有就是显示汉字之后可以上下左右滚动的函数？

麻烦斑竹啦 还有就是能不能加上注释 谢谢啦