161 lines
4.5 KiB
C
161 lines
4.5 KiB
C
/*
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* lc7981.h
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*
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* Created on: 01.05.2009
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* Author: sebastian
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*
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* This file is part of Sebastians AVR Library for lc7981.
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*
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* Sebastians AVR Library for lc789 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Sebastians AVR Library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Sebastians AVR Library. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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* 'Do the thing you want to do and let your spirits guide you through.
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* Live a life, worth being remembered.'
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* -- Remembered - Firewind --
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*/
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#ifndef LC7981_H_
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#define LC7981_H_ LC7981_H_ //!< protects this file from beeing double included
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#include <avr/io.h>
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#include <util/delay.h>
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#include <avr/pgmspace.h>
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#define LCD_CTRL PORTA //!< Port used for control signals
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#define LCD_CRTL_DDR DDRA //!< Data-Direction-Register for the control signals
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#define LCD_RS PA4 //!< Register-Select Pin of the Display
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#define LCD_RW PA2 //!< Read-Write-select Pin
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#define LCD_EN PA0 //!< Strobe Pin
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#define LCD_DATA PORTD //!< Port used for data
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#define LCD_DATA_PIN PIND //!< Port used for reading the data
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#define LCD_DATA_DDR DDRD //!< Data-Direction-Register for data
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// Macros for (un)setting the control pins
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#define lcd_rs_high() (LCD_CTRL |= (1 << LCD_RS)) //!< Set the Register-Select pin high
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#define lcd_rs_low() (LCD_CTRL &= ~(1 << LCD_RS)) //!< Set the Register-Select pin low
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#define lcd_rw_high() (LCD_CTRL |= (1 << LCD_RW)) //!< Set the Read-Write-Select pin high
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#define lcd_rw_low() (LCD_CTRL &= ~(1 << LCD_RW)) //!< Set the Register-Select pin low
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#define lcd_en_high() (LCD_CTRL |= (1 << LCD_EN)) //!< Set the strobe pin high
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#define lcd_en_low() (LCD_CTRL &= ~(1 << LCD_EN)) //!< Set the strobe pin low
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#define LCD_TEXT 0 //!< Constant for text mode
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#define LCD_TEXT_LINES 10 //!< Number of lines in text mode
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#define LCD_TEXT_COLUMNS 26 //!< Number of columns in text mode
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#define LCD_GRAPHIC 1 //!< Constant for graphic mode
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#define LCD_GRAPHIC_WIDTH 160 //!< Horizontal display size in pixels
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#define LCD_GRAPHIC_HEIGHT 80 //!< Vertical display size in pixels
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#define PIXEL_ON 1 //!< see lcd_plot_pixel
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#define PIXEL_OFF 0 //!< see lcd_plot_pixel
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void lcd_init(uint8_t mode);
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void lcd_clear(void);
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void lcd_write_text(char *txt);
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void lcd_gotoxy(uint8_t x, uint8_t y);
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void lcd_plot_pixel(uint8_t x, uint8_t y, uint8_t set);
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void lcd_plot_bitmap(uint8_t x, uint8_t y, PGM_P bitmap, uint8_t w, uint8_t h);
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void lcd_plot_char(uint8_t x_off, uint8_t y_off, uint8_t c, uint8_t fw, uint8_t fh, PGM_P font);
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void lcd_plot_text(uint8_t x_off, uint8_t y_off, const char *text, uint8_t fw, uint8_t fh, PGM_P font);
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void lcd_plot_pgmtext(uint8_t x_off, uint8_t y_off, PGM_P text, uint8_t fw, uint8_t fh, PGM_P font);
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static inline void lcd_strobe(void);
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static inline void lcd_write_command(uint8_t cmd, uint8_t data);
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static inline uint8_t lcd_read_byte(void);
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// Static inline functions, that can be used in the library and in the main programm
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/**
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* Generates the strobe signal for writing data.
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* This function is meant for internal usage only.
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*/
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static inline void lcd_strobe(void) {
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lcd_en_high();
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_delay_us(1);
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lcd_en_low();
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}
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/**
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* Writes a command and a data byte to the lcd.
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*
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* @param cmd the command byte
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* @param data the data that is going to be written after the command
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*/
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static inline void lcd_write_command(uint8_t cmd, uint8_t data) {
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_delay_us(30);
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lcd_rw_low();
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lcd_rs_high();
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LCD_DATA = cmd;
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_delay_us(1);
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lcd_strobe();
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lcd_rs_low();
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LCD_DATA = data;
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_delay_us(1);
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lcd_strobe();
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}
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/**
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* Reads a byte from the display memory.
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* lcd_gotoxy can be used to set the location.
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* Important : lcd_gotoxy doesn't work in graphics mode yet.
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*
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* @return the byte which has been read
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* @see lcd_gotoxy
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*/
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static inline uint8_t lcd_read_byte(void) {
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uint8_t i,data;
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for(i = 0; i < 2; i++) {
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_delay_us(30);
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lcd_rw_low();
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lcd_rs_high();
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LCD_DATA = 0x0D;
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_delay_us(1);
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lcd_en_high();
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LCD_DATA_DDR = 0x00;
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lcd_rs_low();
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lcd_rw_high();
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_delay_us(1);
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data = (uint8_t) LCD_DATA_PIN;
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lcd_en_low();
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LCD_DATA_DDR = 0xFF;
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}
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return data;
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}
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#endif /* LC7981_H_ */
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