137 lines
6.1 KiB
C
137 lines
6.1 KiB
C
/********************************************************************************************
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* include/nuttx/lcd/hd4478ou.h
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*
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* Definitions for the Hitachi HD44780U LCD controller (as used in the
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* LCD1602).
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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********************************************************************************************/
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#ifndef __INCLUDE_NUTTX_HD4478OU_H
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#define __INCLUDE_NUTTX_HD4478OU_H
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/********************************************************************************************
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* Included Files
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********************************************************************************************/
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/* Command set:
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*
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* RS=0 R/W=0 : Command
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* RS=0 R/W=1 : Busy/AD, Read CT (see below)
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* RS=1 R/W=0 : Write data to CGRAM or DDRAM
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* RS=1 R/W=0 : Read data from CGRAM or DDRAM
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*/
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#define HD4478OU_CLEAR (0x01) /* Screen Clear, Set AC to 0 */
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#define HD4478OU_RETURN (0x03) /* DDRAM AD=0, return */
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#define HD4478OU_INPUT (0x04) /* Set moving direction of cursor */
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# define HD4478OU_INPUT_SHIFT (1 << 0) /* Shift */
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# define HD4478OU_INPUT_INCR (1 << 1) /* Increment mode */
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# define HD4478OU_INPUT_DECR (0x00) /* Decrement mode */
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#define HD4478OU_DISPLAY (0x08) /* Set display, cursor, blink on/off */
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# define HD4478OU_DISPLAY_BLINK (1 << 0) /* Blink on/off */
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# define HD4478OU_DISPLAY_CURSOR (1 << 1) /* Cursor on/off */
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# define HD4478OU_DISPLAY_ON (1 << 2) /* Display on/off */
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#define HD4478OU_SHIFT (0x10) /* Remove cursor and whole diplay */
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# define HD4478OU_SHIFT_RIGHT (1 << 2) /* Shift right */
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# define HD4478OU_SHIFT_LEFT (0x00) /* Shift right */
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# define HD4478OU_SHIFT_DISPLAY (1 << 3) /* Display shift */
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# define HD4478OU_SHIFT_CURSOR (0x00) /* Cursor shift */
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#define HD4478OU_FUNC (0x23) /* Set DL, display line, font */
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# define HD4478OU_FUNC_F5x10 (1 << 2) /* 5x10 Style */
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# define HD4478OU_FUNC_F5x7 (0x00) /* 5x7 Style */
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# define HD4478OU_FUNC_N1 (1 << 3) /* N=2R */
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# define HD4478OU_FUNC_N0 (0x00) /* N=1R */
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# define HD4478OU_FUNC_DL8D (1 << 4) /* DL=8D, 8-bit interface */
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# define HD4478OU_FUNC_DL4D (0x00) /* DL=4D, 4-bit interface */
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#define HD4478OU_CGRAM_AD(a) (0x40|(a)) /* Set CGRAM AD, send receive data */
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#define HD4478OU_DDRAM_AD(a) (0x80|(a)) /* Set DDRAM AD, send receive data */
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/* RS=0 R/W=1 : Execute internal function, read AD of CT */
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#define HD4478OU_BF (1 << 7) /* Busy flag */
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#define HD4478OU_AC_SHIFT (0) /* AD of CT */
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#define HD4478OU_AC_MASK (0x7f << HD4478OU_BUSY_AC_SHIFT)
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/* DDRAM Addressing.
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*
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* Internally, the HD44780U supports a display size of up to 2x40 addressed
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* as follows:
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*
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* Column 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ... 39
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* Row 0 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f ... 27
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* Ro1 1 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f ... 67
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*/
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#define HD4478OU_DDRAM_ROW0 0x00
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#define HD4478OU_DDRAM_ROW1 0x40
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/********************************************************************************************
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* Pre-processor Definitions
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********************************************************************************************/
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/********************************************************************************************
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* Public Types
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********************************************************************************************/
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/********************************************************************************************
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* Public Data
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********************************************************************************************/
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/********************************************************************************************
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* Public Function Prototypes
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********************************************************************************************/
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/********************************************************************************************
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* Name: up_lcd1602_initialize
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*
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* Description:
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* The LCD1602 is an HD4478OU-based LCD from Wave share. This function initializes the
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* LCD1602 hardware and registers the character driver as /dev/lcd1602.
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*
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* NOTE: This common interface definition is provided, however, the underlying
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* implemenataton is always board-specific for this LCD.
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*
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********************************************************************************************/
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int up_lcd1602_initialize(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __INCLUDE_NUTTX_HD4478OU_H */
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