www.pudn.com > LPC2148_IAR_LPC2148.zip > drv_hd44780_l.c

/************************************************************************* 
 * 
 *    Used with ICCARM and AARM. 
 * 
 *    (c) Copyright IAR Systems 2005 
 * 
 *    File name   : drv_hd44780_l.c 
 *    Description : I/O function 
 * 
 *    History : 
 *    1. Data        : June 13, 2005 
 *       Author      : Stanimir Bonev 
 *       Description : Create 
 * 
 *    $Revision: 1.1.2.1 $ 
**************************************************************************/ 
 
void HD44780_IO_Init (void); 
void HD44780SetRS (Boolean Data); 
void HD44780SetE (Boolean Data); 
#if HD4780_WR > 0 
void HD44780SetRW (Boolean Data); 
Int8U HD44780RdIO (void); 
#endif 
void HD44780WrIO (Int8U); 
 
#define HD44780_INPUT_SET_MASK        ~0x00003C00 
#define HD44780_OUTPUT_SET_MASK       0x30403C00 
 
/************************************************************************* 
 * Function Name: HD44780_IO_Init 
 * Parameters: none 
 * Return: none 
 * Description: Init IO ports directions and level 
 * 
 *************************************************************************/ 
void HD44780_IO_Init (void) 
{ 
  PINSEL0 &= ~0x0FF00000; 
  PINSEL1 &= ~0x0F003000; 
  IO0DIR  |= HD44780_OUTPUT_SET_MASK; 
  // RS Ouput - Low 
  HD44780SetRS(0); 
  // E  Ouput - Low 
  HD44780SetE(0); 
#if HD4780_WR > 0 
  // WR Ouput - Low 
  HD44780SetRW(0); 
#endif 
} 
 
/************************************************************************* 
 * Function Name: HD44780SetRS 
 * Parameters: Boolean Data 
 * Return: none 
 * Description: Set RS signal 
 * 
 *************************************************************************/ 
void HD44780SetRS (Boolean Data) 
{ 
  if(Data) 
  { 
    IO0SET = 1<<22; 
  } 
  else 
  { 
    IO0CLR = 1<<22; 
  } 
} 
 
/************************************************************************* 
 * Function Name: HD44780SetE 
 * Parameters: Boolean Data 
 * Return: none 
 * Description: Set E signal 
 * 
 *************************************************************************/ 
void HD44780SetE (Boolean Data) 
{ 
  if(Data) 
  { 
    IO0SET = 1<<28; 
  } 
  else 
  { 
    IO0CLR = 1<<28; 
  } 
} 
 
/************************************************************************* 
 * Function Name: HD44780WrIO 
 * Parameters: Int8U Data 
 * Return: none 
 * Description: Write to HD44780 I/O 
 * 
 *************************************************************************/ 
void HD44780WrIO (Int8U Data) 
{ 
Int32U Tmp = (Int32U)Data << 10; 
  // Set Direction 
  IO0DIR  |= HD44780_OUTPUT_SET_MASK; 
#if HD4780_WR > 0 
  HD44780SetRW(0); 
#endif 
  // Write Data 
  // Clock E 
  HD44780SetE(1); 
 
  IO0SET |=  Tmp & 0x3C00; 
  IO0CLR |= ~Tmp & 0x3C00 ; 
  HD44780_BUS_DLY(); 
  HD44780SetE(0); 
} 
 
#if HD4780_WR > 0 
/************************************************************************* 
 * Function Name: HD44780SetRW 
 * Parameters: Boolean Data 
 * Return: none 
 * Description: Set R/W signal 
 * 
 *************************************************************************/ 
void HD44780SetRW (Boolean Data) 
{ 
  if(Data) 
  { 
    IO0SET = 1<<29; 
  } 
  else 
  { 
    IO0CLR = 1<<29; 
  } 
} 
 
/************************************************************************* 
 * Function Name: HD44780RdIO 
 * Parameters: none 
 * Return: Int8U 
 * Description: Read from HD44780 I/O 
 * 
 *************************************************************************/ 
Int8U HD44780RdIO (void) 
{ 
Int8U Data; 
  // Set Direction 
  IO0DIR  &= HD44780_INPUT_SET_MASK; 
  HD44780SetRW(1); 
  // Read Data 
  HD44780SetE(1); 
  HD44780_BUS_DLY(); 
  Data = (IO0PIN >> 10) & 0xF; 
  HD44780SetE(0); 
  // Clock E 
  return Data; 
} 
#endif