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101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
15 years ago
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/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <joerg@FreeBSD.ORG> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Joerg Wunsch
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* ----------------------------------------------------------------------------
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*
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* HD44780 LCD display driver
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*
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* $Id: hd44780.h,v 1.1 2005/12/28 21:38:59 joerg_wunsch Exp $
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*/
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/*
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* Send byte b to the LCD. rs is the RS signal (register select), 0
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* selects instruction register, 1 selects the data register.
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*/
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void hd44780_outbyte(uint8_t b, uint8_t rs);
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/*
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* Read one byte from the LCD controller. rs is the RS signal, 0
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* selects busy flag (bit 7) and address counter, 1 selects the data
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* register.
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*/
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uint8_t hd44780_inbyte(uint8_t rs);
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/*
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* Wait for the busy flag to clear.
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*/
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void hd44780_wait_ready(void);
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/*
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* Initialize the LCD controller hardware.
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*/
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void hd44780_init(void);
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/* Send a command to the LCD controller. */
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#define hd44780_outcmd(n) hd44780_outbyte((n), 0)
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/* Send a data byte to the LCD controller. */
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#define hd44780_outdata(n) hd44780_outbyte((n), 1)
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/* Read the address counter and busy flag from the LCD. */
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#define hd44780_incmd() hd44780_inbyte(0)
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/* Read the current data byte from the LCD. */
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#define hd44780_indata() hd44780_inbyte(1)
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/* Clear LCD display command. */
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#define HD44780_CLR \
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0x01
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/* Home cursor command. */
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#define HD44780_HOME \
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0x02
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/*
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* Select the entry mode. inc determines whether the address counter
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* auto-increments, shift selects an automatic display shift.
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*/
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#define HD44780_ENTMODE(inc, shift) \
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(0x04 | ((inc)? 0x02: 0) | ((shift)? 1: 0))
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/*
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* Selects disp[lay] on/off, cursor on/off, cursor blink[ing]
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* on/off.
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*/
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#define HD44780_DISPCTL(disp, cursor, blink) \
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(0x08 | ((disp)? 0x04: 0) | ((cursor)? 0x02: 0) | ((blink)? 1: 0))
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/*
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* With shift = 1, shift display right or left.
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* With shift = 0, move cursor right or left.
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*/
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#define HD44780_SHIFT(shift, right) \
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(0x10 | ((shift)? 0x08: 0) | ((right)? 0x04: 0))
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/*
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* Function set. if8bit selects an 8-bit data path, twoline arranges
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* for a two-line display, font5x10 selects the 5x10 dot font (5x8
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* dots if clear).
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*/
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#define HD44780_FNSET(if8bit, twoline, font5x10) \
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(0x20 | ((if8bit)? 0x10: 0) | ((twoline)? 0x08: 0) | \
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((font5x10)? 0x04: 0))
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/*
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* Set the next character generator address to addr.
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*/
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#define HD44780_CGADDR(addr) \
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(0x40 | ((addr) & 0x3f))
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/*
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* Set the next display address to addr.
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*/
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#define HD44780_DDADDR(addr) \
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(0x80 | ((addr) & 0x7f))
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