Beginning of support for LCD1602

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5545 42af7a65-404d-4744-a932-0658087f49c3
2026-06-07 09:18:00 +08:00 · 2013-01-21 22:46:37 +00:00
parent 2153fc40b5
commit 504dde5934
6 changed files with 508 additions and 4 deletions
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+/********************************************************************************************
+ * include/nuttx/lcd/hd4478ou.h
+ *
+ * Definitions for the Hitachi HD44780U LCD controller (as used in the
+ * LCD1602).
+ *
+ *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ********************************************************************************************/
+
+#ifndef __INCLUDE_NUTTX_HD4478OU_H
+#define __INCLUDE_NUTTX_HD4478OU_H
+
+/********************************************************************************************
+ * Included Files
+ ********************************************************************************************/
+/* Command set:
+ *
+ *   RS=0 R/W=0 : Command
+ *   RS=0 R/W=1 : Busy/AD, Read CT (see below)
+ *   RS=1 R/W=0 : Write data to CGRAM or DDRAM
+ *   RS=1 R/W=0 : Read data from CGRAM or DDRAM
+ */
+
+#define HD4478OU_CLEAR            (0x01)     /* Screen Clear, Set AC to 0 */
+#define HD4478OU_RETURN           (0x02)     /* DDRAM AD=0, return */
+#define HD4478OU_INPUT            (0x04)     /* Set moving direction of cursor */
+#  define HD4478OU_INPUT_SHIFT    (1 << 0)   /*   Shift */
+#  define HD4478OU_INPUT_INCR     (1 << 1)   /*   Increment mode */
+#  define HD4478OU_INPUT_DECR     (0x00)     /*   Decrement mode */
+#define HD4478OU_DISPLAY          (0x08)     /* Set display, cursor, blink on/off */
+#  define HD4478OU_DISPLAY_BLINK  (1 << 0)   /*   Blink on/off */
+#  define HD4478OU_DISPLAY_CURSOR (1 << 1)   /*   Cursor on/off */
+#  define HD4478OU_DISPLAY_ON     (1 << 2)   /*   Display on/off */
+#define HD4478OU_SHIFT            (0x10)     /* Remove cursor and whole diplay */
+#  define HD4478OU_SHIFT_RIGHT    (1 << 2)   /*   Shift right */
+#  define HD4478OU_SHIFT_LEFT     (0x00)     /*   Shift right */
+#  define HD4478OU_SHIFT_DISPLAY  (1 << 3)   /*   Display shift */
+#  define HD4478OU_SHIFT_CURSOR   (0x00)     /*   Cursor shift */
+#define HD4478OU_FUNC             (0x20)     /* Set DL, display line, font */
+#  define HD4478OU_FUNC_F5x10     (1 << 2)   /*   5x10 Style */
+#  define HD4478OU_FUNC_F5x7      (0x00)     /*   5x7 Style */
+#  define HD4478OU_FUNC_N1        (1 << 3)   /*   N=2R */
+#  define HD4478OU_FUNC_N0        (0x00)     /*   N=1R */
+#  define HD4478OU_FUNC_DL8D      (1 << 4)   /*   DL=8D, 8-bit interface */
+#  define HD4478OU_FUNC_DL4D      (0x00)     /*   DL=4D, 4-bit interface */
+#define HD4478OU_CGRAM_AD(a)      (0x40|(a)) /* Set CGRAM AD, send receive data */
+#define HD4478OU_DDRAM_AD(a)      (0x80|(a)) /* Set DDRAM AD, send receive data */
+
+/* RS=0 R/W=1 : Execute internal function, read AD of CT */
+
+#define HD4478OU_BUSY(bf,ac)      ((bf) << 7 | (ac))
+
+/********************************************************************************************
+ * Pre-processor Definitions
+ ********************************************************************************************/
+
+/********************************************************************************************
+ * Public Types
+ ********************************************************************************************/
+
+/********************************************************************************************
+ * Public Data
+ ********************************************************************************************/
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/********************************************************************************************
+ * Public Function Prototypes
+ ********************************************************************************************/
+
+/********************************************************************************************
+ * Name:  up_lcd1602_initialize
+ *
+ * Description:
+ *   the LCD1602 is an HD4478OU-based LCD from Wave share.  This function initializes the
+ *   LCD1602 hardware and registers the character driver as /dev/lcd1602.
+ *
+ ********************************************************************************************/
+
+int up_lcd1602_initialize(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __INCLUDE_NUTTX_HD4478OU_H */