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224 lines
8.2 KiB
C
224 lines
8.2 KiB
C
/*
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lcdpcf8574 lib 0x03
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copyright (c) Davide Gironi, 2013
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Released under GPLv3.
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Please refer to LICENSE file for licensing information.
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References:
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+ based on lcd library by Peter Fleury
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http://jump.to/fleury
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+ CGRAM functions by Péter Papp
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*/
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#ifndef LCD_H
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#define LCD_H
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#include <inttypes.h>
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#include <avr/pgmspace.h>
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#define LCD_PCF8574_INIT 1 //init pcf8574
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#define LCD_PCF8574_DEVICEID 0 //device id, addr = pcf8574 base addr + LCD_PCF8574_DEVICEID
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/**
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* @name Definitions for Display Size
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* Change these definitions to adapt setting to your display
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*/
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#define LCD_LINES 2 /**< number of visible lines of the display */
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#define LCD_DISP_LENGTH 16 /**< visibles characters per line of the display */
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#define LCD_LINE_LENGTH 0x40 /**< internal line length of the display */
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#define LCD_START_LINE1 0x00 /**< DDRAM address of first char of line 1 */
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#define LCD_START_LINE2 0x40 /**< DDRAM address of first char of line 2 */
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#define LCD_START_LINE3 0x14 /**< DDRAM address of first char of line 3 */
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#define LCD_START_LINE4 0x54 /**< DDRAM address of first char of line 4 */
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#define LCD_WRAP_LINES 1 /**< 0: no wrap, 1: wrap at end of visibile line */
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#define LCD_DATA0_PIN 4 /**< pin for 4bit data bit 0 */
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#define LCD_DATA1_PIN 5 /**< pin for 4bit data bit 1 */
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#define LCD_DATA2_PIN 6 /**< pin for 4bit data bit 2 */
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#define LCD_DATA3_PIN 7 /**< pin for 4bit data bit 3 */
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#define LCD_RS_PIN 0 /**< pin for RS line */
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#define LCD_RW_PIN 1 /**< pin for RW line */
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#define LCD_E_PIN 2 /**< pin for Enable line */
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#define LCD_LED_PIN 3 /**< pin for Led */
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/**
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* @name Definitions for LCD command instructions
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* The constants define the various LCD controller instructions which can be passed to the
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* function lcd_command(), see HD44780 data sheet for a complete description.
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*/
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/* instruction register bit positions, see HD44780U data sheet */
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#define LCD_CLR 0 /* DB0: clear display */
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#define LCD_HOME 1 /* DB1: return to home position */
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#define LCD_ENTRY_MODE 2 /* DB2: set entry mode */
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#define LCD_ENTRY_INC 1 /* DB1: 1=increment, 0=decrement */
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#define LCD_ENTRY_SHIFT 0 /* DB2: 1=display shift on */
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#define LCD_ON 3 /* DB3: turn lcd/cursor on */
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#define LCD_ON_DISPLAY 2 /* DB2: turn display on */
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#define LCD_ON_CURSOR 1 /* DB1: turn cursor on */
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#define LCD_ON_BLINK 0 /* DB0: blinking cursor ? */
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#define LCD_MOVE 4 /* DB4: move cursor/display */
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#define LCD_MOVE_DISP 3 /* DB3: move display (0-> cursor) ? */
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#define LCD_MOVE_RIGHT 2 /* DB2: move right (0-> left) ? */
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#define LCD_FUNCTION 5 /* DB5: function set */
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#define LCD_FUNCTION_8BIT 4 /* DB4: set 8BIT mode (0->4BIT mode) */
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#define LCD_FUNCTION_2LINES 3 /* DB3: two lines (0->one line) */
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#define LCD_FUNCTION_10DOTS 2 /* DB2: 5x10 font (0->5x7 font) */
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#define LCD_CGRAM 6 /* DB6: set CG RAM address */
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#define LCD_DDRAM 7 /* DB7: set DD RAM address */
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#define LCD_BUSY 7 /* DB7: LCD is busy */
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/* set entry mode: display shift on/off, dec/inc cursor move direction */
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#define LCD_ENTRY_DEC 0x04 /* display shift off, dec cursor move dir */
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#define LCD_ENTRY_DEC_SHIFT 0x05 /* display shift on, dec cursor move dir */
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#define LCD_ENTRY_INC_ 0x06 /* display shift off, inc cursor move dir */
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#define LCD_ENTRY_INC_SHIFT 0x07 /* display shift on, inc cursor move dir */
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/* display on/off, cursor on/off, blinking char at cursor position */
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#define LCD_DISP_OFF 0x08 /* display off */
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#define LCD_DISP_ON 0x0C /* display on, cursor off */
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#define LCD_DISP_ON_BLINK 0x0D /* display on, cursor off, blink char */
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#define LCD_DISP_ON_CURSOR 0x0E /* display on, cursor on */
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#define LCD_DISP_ON_CURSOR_BLINK 0x0F /* display on, cursor on, blink char */
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/* move cursor/shift display */
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#define LCD_MOVE_CURSOR_LEFT 0x10 /* move cursor left (decrement) */
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#define LCD_MOVE_CURSOR_RIGHT 0x14 /* move cursor right (increment) */
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#define LCD_MOVE_DISP_LEFT 0x18 /* shift display left */
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#define LCD_MOVE_DISP_RIGHT 0x1C /* shift display right */
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/* function set: set interface data length and number of display lines */
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#define LCD_FUNCTION_4BIT_1LINE 0x20 /* 4-bit interface, single line, 5x7 dots */
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#define LCD_FUNCTION_4BIT_2LINES 0x28 /* 4-bit interface, dual line, 5x7 dots */
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#define LCD_FUNCTION_8BIT_1LINE 0x30 /* 8-bit interface, single line, 5x7 dots */
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#define LCD_FUNCTION_8BIT_2LINES 0x38 /* 8-bit interface, dual line, 5x7 dots */
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#define LCD_MODE_DEFAULT ((1<<LCD_ENTRY_MODE) | (1<<LCD_ENTRY_INC) )
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/**
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* @name Functions
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*/
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/**
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@brief Initialize display and select type of cursor
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@param dispAttr \b LCD_DISP_OFF display off\n
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\b LCD_DISP_ON display on, cursor off\n
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\b LCD_DISP_ON_CURSOR display on, cursor on\n
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\b LCD_DISP_ON_CURSOR_BLINK display on, cursor on flashing
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@return none
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*/
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extern void lcd_init(uint8_t dispAttr);
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/**
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@brief Clear display and set cursor to home position
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@param void
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@return none
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*/
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extern void lcd_clrscr(void);
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/**
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@brief Set cursor to home position
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@param void
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@return none
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*/
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extern void lcd_home(void);
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/**
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@brief Set cursor to specified position
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@param x horizontal position\n (0: left most position)
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@param y vertical position\n (0: first line)
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@return none
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*/
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extern void lcd_gotoxy(uint8_t x, uint8_t y);
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/**
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@brief Set illumination pin
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@param void
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@return none
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*/
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extern void lcd_led(uint8_t onoff);
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/**
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@brief Display character at current cursor position
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@param c character to be displayed
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@return none
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*/
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extern void lcd_putc(char c);
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/**
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@brief Display string without auto linefeed
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@param s string to be displayed
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@return none
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*/
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extern void lcd_puts(const char *s);
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/**
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@brief Display string from program memory without auto linefeed
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@param s string from program memory be be displayed
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@return none
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@see lcd_puts_P
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*/
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extern void lcd_puts_p(const char *progmem_s);
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/**
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@brief Send LCD controller instruction command
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@param cmd instruction to send to LCD controller, see HD44780 data sheet
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@return none
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*/
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extern void lcd_command(uint8_t cmd);
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/**
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@brief Send data byte to LCD controller
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Similar to lcd_putc(), but without interpreting LF
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@param data byte to send to LCD controller, see HD44780 data sheet
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@return none
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*/
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extern void lcd_data(uint8_t data);
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/**
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@brief Clear CGRAM
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@param void
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@return none
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*/
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extern void lcd_clear_CGRAM (void);
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/**
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@brief Create custom character in CGRAM
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@param charnum: Character position in CGRAM. You can define maximum 8 chars.
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@param values[]: Custom character descriptor pointer.
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@return 0 - The custom character successfully created
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@return 1 - If the charnum greater than 7. You can define maximum 8 chars.
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*/
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extern uint8_t lcd_create_custom_char (uint8_t charnum, const uint8_t * values);
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/**
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@brief macros for automatically storing string constant in program memory
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*/
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#define lcd_puts_P(__s) lcd_puts_p(PSTR(__s))
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/*@}*/
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#endif //LCD_H
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