106 lines
4.4 KiB
C
106 lines
4.4 KiB
C
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/*******************************************************************************
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Copyright (c) 2009-2010 by Tensilica Inc. ALL RIGHTS RESERVED.
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These coded instructions, statements, and computer programs are the
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copyrighted works and confidential proprietary information of Tensilica Inc.
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They may not be modified, copied, reproduced, distributed, or disclosed to
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third parties in any manner, medium, or form, in whole or in part, without
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the prior written consent of Tensilica Inc.
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--------------------------------------------------------------------------------
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lcd-SPLC780D-4bitmode.h Generic definitions for Sunplus SPLC780D LCD Controller
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operating in 4 bit mode.
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This is used by board-support-packages with one or more LCD displays that use
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a SPLC780D controller in 4 bit mode. A BSP provides a base address for each
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instance of an SPLC780D LCD controller on the board.
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Note that LCD display operation is almost totally independent of the LCD
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display, depending almost entirely on the controller. However the display
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may limit the number of characters of the controller's RAM buffer that are
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actually visible at one time. The length of the display's visible window
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is not specifified in this controller-specific header, but comes to the
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driver from the board-specific "display.h" header.
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*******************************************************************************/
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#ifndef _LCD_SPLC780D_4BIT_H_
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#define _LCD_SPLC780D_4BIT_H_
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/* Offsets to controller registers from base. */
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#define SPLC780D_4BIT_INST 0
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#define SPLC780D_4BIT_DATA (SPLC780D_4BIT_INST + SPLC780D_4BIT_REGSPACING)
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#define SPLC780D_4BIT_INST_INIT1 0xFF /* First command in
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init sequence */
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#define SPLC780D_4BIT_INST_INIT2 0x30 /* Second command in
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init sequence,
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issued 3 times */
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#define SPLC780D_4BIT_INST_INIT3 0x20 /* Third and last command
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in init sequence */
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#define SPLC780D_4BIT_INST_CLEAR 0x01 /* clear (blank) display) */
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#define SPLC780D_4BIT_INST_SET_MODE 0x28 /* Set LCD mode. Supported
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setting is 4 bit data
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length, 2 lines, 5*8 */
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#define SPLC780D_4BIT_INST_DSPLY_ON 0x0C /* Set Display ON */
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#define SPLC780D_4BIT_INST_CRSR_INC 0x06 /* Set cursor moving direction
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as increment */
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#define SPLC780D_4BIT_LINET_ADDR 0x80 /* clear (blank) display) */
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#define SPLC780D_4BIT_LINEB_ADDR 0xC0 /* clear (blank) display) */
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#ifndef __ASSEMBLER__
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/* C interface to controller registers. */
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struct splc780d_4bit_s {
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splc780d_4bit_reg_t inst; /* instruction register */
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splc780d_4bit_reg_t data; /* data register */
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};
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typedef volatile struct splc780d_4bit_s splc780d_4bit_t;
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/*
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Prototypes of high level driver functions.
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*/
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/* Write an instruction byte to LCD, result in two back to back writes since the
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* LCD is hooked up in 4 bit mode*/
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extern void lcd_write_inst_byte(splc780d_4bit_t *lcd, unsigned char inst);
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/* Write a data byte to LCD, result in two back to back writes since the
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* LCD is hooked up in 4 bit mode*/
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extern void lcd_write_data_byte(splc780d_4bit_t *lcd, unsigned char data);
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/*
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Initialize the display with default settings.
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*/
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extern void splc780d_4bit_init_default(splc780d_4bit_t *lcd);
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/*
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Write a single character at a given position (chars from left, starting at 0).
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Wait long enough afterward for the controller to be ready for more input.
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Positions beyond the end of the display are ignored.
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*/
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extern void splc780d_4bit_write_char(splc780d_4bit_t *lcd, unsigned pos, const char c);
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/*
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Write a string to the display starting at the left (position 0).
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Blank-pad to or truncate at the end of the display (overwrites any previous
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string so don't need to blank the display first).
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Wait long enough after each char for the controller to be ready for more input.
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*/
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extern void splc780d_4bit_write_string(splc780d_4bit_t *lcd, const char *s);
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/*
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Blank (clear) the entire display.
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Wait long enough afterward for the controller to be ready for more input.
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*/
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extern void splc780d_4bit_blank(splc780d_4bit_t *lcd);
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#endif /* __ASSEMBLER__ */
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#endif /* _LCD_SPLC780D_4BIT_H_ */
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