drv_hd44780.c

Segger JTAG Debugger

  if (HD4478_Ctrl.Line)
  {
    Command |= HD44780_FUNCTION_SET_2_LINE;
  }
  if (HD4478_Ctrl.DotMode)
  {
    Command |= HD44780_FUNCTION_SET_DOT_5_10;
  }
  HD44780WrComm(Command);
  if (HD44780_BusyCheck(NULL) != HD44780_OK)
  {
    return HD44780_ERROR;
  }
  /* Display off */
  HD44780WrComm(HD44780_DISPLAY_CTRL);
  if (HD44780_BusyCheck(NULL) != HD44780_OK)
  {
    return HD44780_ERROR;
  }
  /* Display clear */
  if (HD44780_ClearDisplay() != HD44780_OK)
  {
    return HD44780_ERROR;
  }
  /* Set entry mode */
  Command = HD44780_ENTRY_MODE;
  if (HD4478_Ctrl.AC_Direction)
  {
    Command |= HD44780_ENTRY_MODE_INC;
  }
  if (HD4478_Ctrl.DisplayShift)
  {
    Command |= HD44780_ENTRY_MODE_BOTH_S;
  }
  HD44780WrComm(HD44780_DISPLAY_CTRL);
  if (HD44780_BusyCheck(NULL) != HD44780_OK)
  {
    return HD44780_ERROR;
  }
  /* Set Display and cursor mode */
  if (HD44780_SetMode() != HD44780_OK)
  {
    return HD44780_ERROR;
  }
  return HD44780_OK;
}

/*************************************************************************
 * Function Name: HD44780_GetSetting
 * Parameters: none
 * Return: HD44780_CTRL_DEF *
 * Description: Return pointer to Driver settings structure
 *
 *************************************************************************/
HD44780_CTRL_DEF * HD44780_GetSetting(void)
{
  return &HD4478_Ctrl;
}

/*************************************************************************
 * Function Name: HD44780_SetMode
 * Parameters: none
 * Return: HD44780_ERROR_CODE_DEF
 *         HD44780_OK	 0: Pass
 *	   HD44780_ERROR 1: Busy check Time Out
 * Description: Set diplay mode: Display On/Off; Cursor On/Off
 *  Cursor blink On/Off
 *************************************************************************/
HD44780_ERROR_CODE_DEF HD44780_SetMode (void)
{
LPC_INT8U Command = HD44780_DISPLAY_CTRL;
  if (HD4478_Ctrl.DisplayOn)
  {
    Command |= HD44780_DISPLAY_CTRL_D_ON;
  }
  if (HD4478_Ctrl.CursorOn)
  {
    Command |= HD44780_DISPLAY_CTRL_C_ON;
  }
  if (HD4478_Ctrl.CursorBlink)
  {
    Command |= HD44780_DISPLAY_CTRL_C_BLINK;
  }
  HD44780WrComm(Command);
  return HD44780_BusyCheck(NULL);
}

/*************************************************************************
 * Function Name: HD44780_ClearDisplay
 * Parameters: none
 * Return: HD44780_ERROR_CODE_DEF
 *         HD44780_OK	 0: Pass
 *	   HD44780_ERROR 1: Busy check Time Out
 * Description: Clear dispaly and set position to home
 *
 *************************************************************************/
HD44780_ERROR_CODE_DEF HD44780_ClearDisplay (void)
{
  HD44780WrComm(HD44780_CLEAR);
  return HD44780_BusyCheck(NULL);
}

/*************************************************************************
 * Function Name: HD44780_ReturnToHome
 * Parameters: none
 * Return: HD44780_ERROR_CODE_DEF
 *         HD44780_OK	 0: Pass
 *	   HD44780_ERROR 1: Busy check Time Out
 * Description: Set display position to home
 *
 *************************************************************************/
HD44780_ERROR_CODE_DEF HD44780_ReturnToHome (void)
{
  HD44780WrComm(HD44780_RETURN);
  return HD44780_BusyCheck(NULL);
}

/*************************************************************************
 * Function Name: HD44780_DisplayShift
 * Parameters: LPC_BOOL DisplayOn, LPC_INT8S DiplayShift
 * Return: HD44780_ERROR_CODE_DEF
 *         HD44780_OK	 0: Pass
 *	   HD44780_ERROR 1: Busy check Time Out
 * Description: Shift display
 *
 *************************************************************************/
HD44780_ERROR_CODE_DEF HD44780_DisplayShift (LPC_BOOL DisplayOn, LPC_INT8S DiplayShift)
{
LPC_INT8U ShiftDir;
  if (DiplayShift >= 0)
  {
    if(DiplayShift > HD44780_MAX_LINE1_ADD)
    {
      return HD44780_ERROR;
    }
    ShiftDir = HD44780_DISPLAY_MOVE_RIGHT;
  }
  else
  {
    if(DiplayShift < -HD44780_MAX_LINE2_ADD)
    {
      return HD44780_ERROR;
    }
    ShiftDir = HD44780_DISPLAY_MOVE_LEFT;
    DiplayShift = 0 - DiplayShift;  /* DiplayShift = -DiplayShift */
  }
  for (int i = 0; i < DiplayShift; ++i)
  {
    HD44780WrComm(HD44780_DISPLAY_MOVE + HD44780_DISPLAY_MOVE_D + ShiftDir);
    if (HD44780_BusyCheck(NULL) != HD44780_OK)
    {
      return HD44780_ERROR;
    }
    if (ShiftDir == HD44780_DISPLAY_MOVE_LEFT)
    {
      if(++HD4478_Ctrl.DiplayPos > 39)
      {
        HD4478_Ctrl.DiplayPos = 0;
      }
    }
    else
    {
      if(--HD4478_Ctrl.DiplayPos > 39) /* --0 = 0xFF > 39 */
      {
        HD4478_Ctrl.DiplayPos = 39;
      }
    }
  }
  return HD44780_OK;
}

/*************************************************************************
 * Function Name: HD44780_CursorPosSet
 * Parameters: LPC_BOOL CursorOn,
 *             HD44780_XY_DEF X,
 *             HD44780_XY_DEF Y
 * Return: HD44780_ERROR_CODE_DEF
 *         HD44780_OK	 0: Pass
 *	   HD44780_ERROR 1: Busy check Time Out
 * Description: Set position of cursor
 *
 *************************************************************************/
HD44780_ERROR_CODE_DEF HD44780_CursorPosSet (LPC_BOOL CursorOn,LPC_BOOL CursorBlink, HD44780_XY_DEF X, HD44780_XY_DEF Y)
{
LPC_INT8U CursorPos;
  /* Find Addres by coordinate */
  if (HD44780_GetDDRamAdd(X,Y,&CursorPos) != HD44780_OK)
  {
    return HD44780_ERROR;
  }
  /* Cursor off */
  HD4478_Ctrl.CursorOn = HD44780_CURSOR_OFF;
  if (HD44780_SetMode() != HD44780_OK)
  {
    return HD44780_ERROR;
  }
  /* Set Address to DDRAM */
  HD44780WrComm(HD44780_SET_DDRAM_ADD + CursorPos);
  if (HD44780_BusyCheck(NULL) != HD44780_OK)
  {
    return HD44780_ERROR;
  }
  /* Set Cursor dependence of CursorOn */
  HD4478_Ctrl.CursorOn = CursorOn;
  HD4478_Ctrl.CursorBlink = CursorBlink;
  return HD44780_SetMode();
}

/*************************************************************************
 * Function Name: HD44780_RdCGRAM
 * Parameters: HD44780_STRING_DEF * CG_Data,
 *             LPC_INT8U CGRAM_Add
 * Return: HD44780_ERROR_CODE_DEF
 *        HD44780_OK	 0: Pass
 *	  HD44780_ERROR  1: Busy check Time Out
 * Description: Read Character patern from CGRAM
 *
 *************************************************************************/
HD44780_ERROR_CODE_DEF HD44780_RdCGRAM (HD44780_STRING_DEF * CG_Data, LPC_INT8U CGRAM_Add)
{
LPC_INT8U Counter = 8;
LPC_INT8U DDRAM_AddHold;
  if (CGRAM_Add > HD44780_MAX_CGRAM)
  {
    return HD44780_ERROR;
  }
  /* Get current DDRAM address */
  if (HD44780_BusyCheck(&DDRAM_AddHold) != HD44780_OK)
  {
    return HD44780_ERROR;
  }
  if (HD4478_Ctrl.DotMode)
  {
    Counter = 10;
    /* Address aling to chracter space */
    CGRAM_Add &= 0xF;
  }
  else
  {
    Counter = 8;
    /* Address aling to chracter space */
    CGRAM_Add &= 0x7;
  }
  /* Set CGRAM Address */
  HD44780WrComm(HD44780_SET_CGRAM_ADD + Counter);
  if (HD44780_BusyCheck(NULL) != HD44780_OK)
  {
    return HD44780_ERROR;
  }
  for ( ;Counter; --Counter)
  {
    *CG_Data = HD44780RdData();
    if (HD44780_BusyCheck(NULL) != HD44780_OK)
    {
      break;
    }
    ++CG_Data;
  }
  HD44780WrComm(HD44780_SET_DDRAM_ADD + Counter);
  return((HD44780_ERROR_CODE_DEF)(HD44780_BusyCheck(NULL) || (Counter?HD44780_ERROR:HD44780_OK)));
}

/*************************************************************************
 * Function Name: HD44780_WrCGRAM
 * Parameters: const HD44780_STRING_DEF * CG_Data,
 *             LPC_INT8U CGRAM_Add
 * Return: HD44780_ERROR_CODE_DEF
 *        HD44780_OK	 0: Pass
 *	  HD44780_ERROR  1: Busy check Time Out
 * Description: Write Charcter patern into CGRAM
 *
 *************************************************************************/
HD44780_ERROR_CODE_DEF HD44780_WrCGRAM (const HD44780_STRING_DEF * CG_Data, LPC_INT8U CGRAM_Add)
{
LPC_INT8U Counter = 8;
LPC_INT8U DDRAM_AddHold;
  if (CGRAM_Add > HD44780_MAX_CGRAM)
  {
    return HD44780_ERROR;
  }
  /* Get current DDRAM address */
  if (HD44780_BusyCheck(&DDRAM_AddHold) != HD44780_OK)
  {
    return HD44780_ERROR;
  }
  if (HD4478_Ctrl.DotMode)
  {
    Counter = 10;
    /* Address aling to chracter space */
    CGRAM_Add &= 0xF;
  }
  else
  {
    Counter = 8;
    /* Address aling to chracter space */
    CGRAM_Add &= 0x7;
  }
  /* Set CGRAM Address */
  HD44780WrComm(HD44780_SET_CGRAM_ADD + Counter);
  if (HD44780_BusyCheck(NULL) != HD44780_OK)
  {
    return HD44780_ERROR;
  }
  for ( ;Counter; --Counter)
  {
    HD44780WrData(*CG_Data);
    if (HD44780_BusyCheck(NULL) != HD44780_OK)
    {
      break;
    }
    ++CG_Data;
  }
  HD44780WrComm(HD44780_SET_DDRAM_ADD + Counter);
  return((HD44780_ERROR_CODE_DEF)(HD44780_BusyCheck(NULL) || (Counter?HD44780_ERROR:HD44780_OK)));
}

/*************************************************************************
 * Function Name: Menu
 * Parameters: none
 * Return: MENU_ERROR_CODE_DEF
 *        HD44780_OK	 0: Pass
 *	  HD44780_ERROR  1: Busy check TimeOut
 * Description: Show zero terminate string into LCD
 *
 *************************************************************************/
HD44780_ERROR_CODE_DEF HD44780_StrShow(HD44780_XY_DEF X, HD44780_XY_DEF Y, const HD44780_STRING_DEF * DataStr)
{
LPC_INT8U DDRamAdd;
HD44780_ERROR_CODE_DEF ErrorRes = HD44780_OK;
  if(HD44780_GetDDRamAdd(X,Y,&DDRamAdd) != HD44780_OK)
  {
    return HD44780_ERROR;
  }
  /* Set Address to DDRAM */
  HD44780WrComm(HD44780_SET_DDRAM_ADD + DDRamAdd);
  if (HD44780_BusyCheck(&DDRamAdd) != HD44780_OK)
  {
    return HD44780_ERROR;
  }
  /* Write zero terminate string int LCD */
  while (*DataStr)
  {
    ErrorRes |= HD44780_CheckVisual(DDRamAdd);
    HD44780WrData(*DataStr);
    if (HD44780_BusyCheck(&DDRamAdd) != HD44780_OK)
    {
      return HD44780_ERROR;
    }
    ++DataStr;
    if((Y == 1) && DDRamAdd > HD44780_MAX_LINE1_ADD)
    {
      HD44780WrComm(HD44780_SET_DDRAM_ADD+HD44780_MIN_LINE1_ADD);
      if (HD44780_BusyCheck(&DDRamAdd) != HD44780_OK)
      {
        return HD44780_ERROR;
      }
    }
    else if ((Y == 2) && DDRamAdd < HD44780_MIN_LINE2_ADD)
    {
      HD44780WrComm(HD44780_SET_DDRAM_ADD+HD44780_MIN_LINE2_ADD);
      if (HD44780_BusyCheck(&DDRamAdd) != HD44780_OK)
      {
        return HD44780_ERROR;
      }
    }
  }
  return ErrorRes;
}