/* * ---------------------------------------------------------------------------- * "THE BEER-WARE LICENSE" (Revision 42): * <joerg@FreeBSD.ORG> wrote this file.  As long as you retain this notice you * can do whatever you want with this stuff. If we meet some day, and you think * this stuff is worth it, you can buy me a beer in return.        Joerg Wunsch * ---------------------------------------------------------------------------- * * HD44780 LCD display driver * * $Id: hd44780.h,v 1.1.2.1 2005/12/28 22:35:08 joerg_wunsch Exp $ *//* * Send byte b to the LCD.  rs is the RS signal (register select), 0 * selects instruction register, 1 selects the data register. */void	hd44780_outbyte(uint8_t b, uint8_t rs);/* * Read one byte from the LCD controller.  rs is the RS signal, 0 * selects busy flag (bit 7) and address counter, 1 selects the data * register. */uint8_t	hd44780_inbyte(uint8_t rs);/* * Wait for the busy flag to clear. */void	hd44780_wait_ready(void);/* * Initialize the LCD controller hardware. */void	hd44780_init(void);/* Send a command to the LCD controller. */#define hd44780_outcmd(n)	hd44780_outbyte((n), 0)/* Send a data byte to the LCD controller. */#define hd44780_outdata(n)	hd44780_outbyte((n), 1)/* Read the address counter and busy flag from the LCD. */#define hd44780_incmd()		hd44780_inbyte(0)/* Read the current data byte from the LCD. */#define hd44780_indata()	hd44780_inbyte(1)/* Clear LCD display command. */#define HD44780_CLR \	0x01/* Home cursor command. */#define HD44780_HOME \	0x02/* * Select the entry mode.  inc determines whether the address counter * auto-increments, shift selects an automatic display shift. */#define HD44780_ENTMODE(inc, shift) \	(0x04 | ((inc)? 0x02: 0) | ((shift)? 1: 0))/* * Selects disp[lay] on/off, cursor on/off, cursor blink[ing] * on/off. */#define HD44780_DISPCTL(disp, cursor, blink) \	(0x08 | ((disp)? 0x04: 0) | ((cursor)? 0x02: 0) | ((blink)? 1: 0))/* * With shift = 1, shift display right or left. * With shift = 0, move cursor right or left. */#define HD44780_SHIFT(shift, right) \	(0x10 | ((shift)? 0x08: 0) | ((right)? 0x04: 0))/* * Function set.  if8bit selects an 8-bit data path, twoline arranges * for a two-line display, font5x10 selects the 5x10 dot font (5x8 * dots if clear). */#define HD44780_FNSET(if8bit, twoline, font5x10) \	(0x20 | ((if8bit)? 0x10: 0) | ((twoline)? 0x08: 0) | \		((font5x10)? 0x04: 0))/* * Set the next character generator address to addr. */#define HD44780_CGADDR(addr) \	(0x40 | ((addr) & 0x3f))/* * Set the next display address to addr. */#define HD44780_DDADDR(addr) \	(0x80 | ((addr) & 0x7f))