diff options
Diffstat (limited to 'platforms/avr/drivers')
| -rw-r--r-- | platforms/avr/drivers/hd44780.c | 542 | ||||
| -rw-r--r-- | platforms/avr/drivers/hd44780.h | 348 |
2 files changed, 0 insertions, 890 deletions
diff --git a/platforms/avr/drivers/hd44780.c b/platforms/avr/drivers/hd44780.c deleted file mode 100644 index f15d7d0da8..0000000000 --- a/platforms/avr/drivers/hd44780.c +++ /dev/null @@ -1,542 +0,0 @@ -/**************************************************************************** - Title: HD44780U LCD library - Author: Peter Fleury <pfleury@gmx.ch> http://tinyurl.com/peterfleury - License: GNU General Public License Version 3 - File: $Id: lcd.c,v 1.15.2.2 2015/01/17 12:16:05 peter Exp $ - Software: AVR-GCC 3.3 - Target: any AVR device, memory mapped mode only for AT90S4414/8515/Mega - - DESCRIPTION - Basic routines for interfacing a HD44780U-based text lcd display - - Originally based on Volker Oth's lcd library, - changed lcd_init(), added additional constants for lcd_command(), - added 4-bit I/O mode, improved and optimized code. - - Library can be operated in memory mapped mode (LCD_IO_MODE=0) or in - 4-bit IO port mode (LCD_IO_MODE=1). 8-bit IO port mode not supported. - - Memory mapped mode compatible with Kanda STK200, but supports also - generation of R/W signal through A8 address line. - - USAGE - See the C include lcd.h file for a description of each function - -*****************************************************************************/ -#include <inttypes.h> -#include <avr/io.h> -#include <avr/pgmspace.h> -#include <util/delay.h> -#include "hd44780.h" - -/* -** constants/macros -*/ -#define DDR(x) (*(&x - 1)) /* address of data direction register of port x */ -#if defined(__AVR_ATmega64__) || defined(__AVR_ATmega128__) -/* on ATmega64/128 PINF is on port 0x00 and not 0x60 */ -# define PIN(x) (&PORTF == &(x) ? _SFR_IO8(0x00) : (*(&x - 2))) -#else -# define PIN(x) (*(&x - 2)) /* address of input register of port x */ -#endif - -#if LCD_IO_MODE -# define lcd_e_delay() _delay_us(LCD_DELAY_ENABLE_PULSE) -# define lcd_e_high() LCD_E_PORT |= _BV(LCD_E_PIN); -# define lcd_e_low() LCD_E_PORT &= ~_BV(LCD_E_PIN); -# define lcd_e_toggle() toggle_e() -# define lcd_rw_high() LCD_RW_PORT |= _BV(LCD_RW_PIN) -# define lcd_rw_low() LCD_RW_PORT &= ~_BV(LCD_RW_PIN) -# define lcd_rs_high() LCD_RS_PORT |= _BV(LCD_RS_PIN) -# define lcd_rs_low() LCD_RS_PORT &= ~_BV(LCD_RS_PIN) -#endif - -#if LCD_IO_MODE -# if LCD_LINES == 1 -# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_4BIT_1LINE -# else -# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_4BIT_2LINES -# endif -#else -# if LCD_LINES == 1 -# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_8BIT_1LINE -# else -# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_8BIT_2LINES -# endif -#endif - -#if LCD_CONTROLLER_KS0073 -# if LCD_LINES == 4 - -# define KS0073_EXTENDED_FUNCTION_REGISTER_ON 0x2C /* |0|010|1100 4-bit mode, extension-bit RE = 1 */ -# define KS0073_EXTENDED_FUNCTION_REGISTER_OFF 0x28 /* |0|010|1000 4-bit mode, extension-bit RE = 0 */ -# define KS0073_4LINES_MODE 0x09 /* |0|000|1001 4 lines mode */ - -# endif -#endif - -/* -** function prototypes -*/ -#if LCD_IO_MODE -static void toggle_e(void); -#endif - -/* -** local functions -*/ - -/************************************************************************* -delay for a minimum of <us> microseconds -the number of loops is calculated at compile-time from MCU clock frequency -*************************************************************************/ -#define delay(us) _delay_us(us) - -#if LCD_IO_MODE -/* toggle Enable Pin to initiate write */ -static void toggle_e(void) { - lcd_e_high(); - lcd_e_delay(); - lcd_e_low(); -} -#endif - -/************************************************************************* -Low-level function to write byte to LCD controller -Input: data byte to write to LCD - rs 1: write data - 0: write instruction -Returns: none -*************************************************************************/ -#if LCD_IO_MODE -static void lcd_write(uint8_t data, uint8_t rs) { - unsigned char dataBits; - - if (rs) { /* write data (RS=1, RW=0) */ - lcd_rs_high(); - } else { /* write instruction (RS=0, RW=0) */ - lcd_rs_low(); - } - lcd_rw_low(); /* RW=0 write mode */ - - if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)) { - /* configure data pins as output */ - DDR(LCD_DATA0_PORT) |= 0x0F; - - /* output high nibble first */ - dataBits = LCD_DATA0_PORT & 0xF0; - LCD_DATA0_PORT = dataBits | ((data >> 4) & 0x0F); - lcd_e_toggle(); - - /* output low nibble */ - LCD_DATA0_PORT = dataBits | (data & 0x0F); - lcd_e_toggle(); - - /* all data pins high (inactive) */ - LCD_DATA0_PORT = dataBits | 0x0F; - } else { - /* configure data pins as output */ - DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN); - DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN); - DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN); - DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN); - - /* output high nibble first */ - LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN); - LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN); - LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN); - LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN); - if (data & 0x80) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN); - if (data & 0x40) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN); - if (data & 0x20) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN); - if (data & 0x10) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN); - lcd_e_toggle(); - - /* output low nibble */ - LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN); - LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN); - LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN); - LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN); - if (data & 0x08) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN); - if (data & 0x04) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN); - if (data & 0x02) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN); - if (data & 0x01) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN); - lcd_e_toggle(); - - /* all data pins high (inactive) */ - LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN); - LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN); - LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN); - LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN); - } -} -#else -# define lcd_write(d, rs) \ - if (rs) \ - *(volatile uint8_t *)(LCD_IO_DATA) = d; \ - else \ - *(volatile uint8_t *)(LCD_IO_FUNCTION) = d; -/* rs==0 -> write instruction to LCD_IO_FUNCTION */ -/* rs==1 -> write data to LCD_IO_DATA */ -#endif - -/************************************************************************* -Low-level function to read byte from LCD controller -Input: rs 1: read data - 0: read busy flag / address counter -Returns: byte read from LCD controller -*************************************************************************/ -#if LCD_IO_MODE -static uint8_t lcd_read(uint8_t rs) { - uint8_t data; - - if (rs) - lcd_rs_high(); /* RS=1: read data */ - else - lcd_rs_low(); /* RS=0: read busy flag */ - lcd_rw_high(); /* RW=1 read mode */ - - if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)) { - DDR(LCD_DATA0_PORT) &= 0xF0; /* configure data pins as input */ - - lcd_e_high(); - lcd_e_delay(); - data = PIN(LCD_DATA0_PORT) << 4; /* read high nibble first */ - lcd_e_low(); - - lcd_e_delay(); /* Enable 500ns low */ - - lcd_e_high(); - lcd_e_delay(); - data |= PIN(LCD_DATA0_PORT) & 0x0F; /* read low nibble */ - lcd_e_low(); - } else { - /* configure data pins as input */ - DDR(LCD_DATA0_PORT) &= ~_BV(LCD_DATA0_PIN); - DDR(LCD_DATA1_PORT) &= ~_BV(LCD_DATA1_PIN); - DDR(LCD_DATA2_PORT) &= ~_BV(LCD_DATA2_PIN); - DDR(LCD_DATA3_PORT) &= ~_BV(LCD_DATA3_PIN); - - /* read high nibble first */ - lcd_e_high(); - lcd_e_delay(); - data = 0; - if (PIN(LCD_DATA0_PORT) & _BV(LCD_DATA0_PIN)) data |= 0x10; - if (PIN(LCD_DATA1_PORT) & _BV(LCD_DATA1_PIN)) data |= 0x20; - if (PIN(LCD_DATA2_PORT) & _BV(LCD_DATA2_PIN)) data |= 0x40; - if (PIN(LCD_DATA3_PORT) & _BV(LCD_DATA3_PIN)) data |= 0x80; - lcd_e_low(); - - lcd_e_delay(); /* Enable 500ns low */ - - /* read low nibble */ - lcd_e_high(); - lcd_e_delay(); - if (PIN(LCD_DATA0_PORT) & _BV(LCD_DATA0_PIN)) data |= 0x01; - if (PIN(LCD_DATA1_PORT) & _BV(LCD_DATA1_PIN)) data |= 0x02; - if (PIN(LCD_DATA2_PORT) & _BV(LCD_DATA2_PIN)) data |= 0x04; - if (PIN(LCD_DATA3_PORT) & _BV(LCD_DATA3_PIN)) data |= 0x08; - lcd_e_low(); - } - return data; -} -#else -# define lcd_read(rs) (rs) ? *(volatile uint8_t *)(LCD_IO_DATA + LCD_IO_READ) : *(volatile uint8_t *)(LCD_IO_FUNCTION + LCD_IO_READ) -/* rs==0 -> read instruction from LCD_IO_FUNCTION */ -/* rs==1 -> read data from LCD_IO_DATA */ -#endif - -/************************************************************************* -loops while lcd is busy, returns address counter -*************************************************************************/ -static uint8_t lcd_waitbusy(void) - -{ - register uint8_t c; - - /* wait until busy flag is cleared */ - while ((c = lcd_read(0)) & (1 << LCD_BUSY)) { - } - - /* the address counter is updated 4us after the busy flag is cleared */ - delay(LCD_DELAY_BUSY_FLAG); - - /* now read the address counter */ - return (lcd_read(0)); // return address counter - -} /* lcd_waitbusy */ - -/************************************************************************* -Move cursor to the start of next line or to the first line if the cursor -is already on the last line. -*************************************************************************/ -static inline void lcd_newline(uint8_t pos) { - register uint8_t addressCounter; - -#if LCD_LINES == 1 - addressCounter = 0; -#endif -#if LCD_LINES == 2 - if (pos < (LCD_START_LINE2)) - addressCounter = LCD_START_LINE2; - else - addressCounter = LCD_START_LINE1; -#endif -#if LCD_LINES == 4 -# if KS0073_4LINES_MODE - if (pos < LCD_START_LINE2) - addressCounter = LCD_START_LINE2; - else if ((pos >= LCD_START_LINE2) && (pos < LCD_START_LINE3)) - addressCounter = LCD_START_LINE3; - else if ((pos >= LCD_START_LINE3) && (pos < LCD_START_LINE4)) - addressCounter = LCD_START_LINE4; - else - addressCounter = LCD_START_LINE1; -# else - if (pos < LCD_START_LINE3) - addressCounter = LCD_START_LINE2; - else if ((pos >= LCD_START_LINE2) && (pos < LCD_START_LINE4)) - addressCounter = LCD_START_LINE3; - else if ((pos >= LCD_START_LINE3) && (pos < LCD_START_LINE2)) - addressCounter = LCD_START_LINE4; - else - addressCounter = LCD_START_LINE1; -# endif -#endif - lcd_command((1 << LCD_DDRAM) + addressCounter); - -} /* lcd_newline */ - -/* -** PUBLIC FUNCTIONS -*/ - -/************************************************************************* -Send LCD controller instruction command -Input: instruction to send to LCD controller, see HD44780 data sheet -Returns: none -*************************************************************************/ -void lcd_command(uint8_t cmd) { - lcd_waitbusy(); - lcd_write(cmd, 0); -} - -/************************************************************************* -Send data byte to LCD controller -Input: data to send to LCD controller, see HD44780 data sheet -Returns: none -*************************************************************************/ -void lcd_data(uint8_t data) { - lcd_waitbusy(); - lcd_write(data, 1); -} - -/************************************************************************* -Set cursor to specified position -Input: x horizontal position (0: left most position) - y vertical position (0: first line) -Returns: none -*************************************************************************/ -void lcd_gotoxy(uint8_t x, uint8_t y) { -#if LCD_LINES == 1 - lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x); -#endif -#if LCD_LINES == 2 - if (y == 0) - lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x); - else - lcd_command((1 << LCD_DDRAM) + LCD_START_LINE2 + x); -#endif -#if LCD_LINES == 4 - if (y == 0) - lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x); - else if (y == 1) - lcd_command((1 << LCD_DDRAM) + LCD_START_LINE2 + x); - else if (y == 2) - lcd_command((1 << LCD_DDRAM) + LCD_START_LINE3 + x); - else /* y==3 */ - lcd_command((1 << LCD_DDRAM) + LCD_START_LINE4 + x); -#endif - -} /* lcd_gotoxy */ - -/************************************************************************* -*************************************************************************/ -int lcd_getxy(void) { - return lcd_waitbusy(); -} - -/************************************************************************* -Clear display and set cursor to home position -*************************************************************************/ -void lcd_clrscr(void) { - lcd_command(1 << LCD_CLR); -} - -/************************************************************************* -Set cursor to home position -*************************************************************************/ -void lcd_home(void) { - lcd_command(1 << LCD_HOME); -} - -/************************************************************************* -Display character at current cursor position -Input: character to be displayed -Returns: none -*************************************************************************/ -void lcd_putc(char c) { - uint8_t pos; - - pos = lcd_waitbusy(); // read busy-flag and address counter - if (c == '\n') { - lcd_newline(pos); - } else { -#if LCD_WRAP_LINES == 1 -# if LCD_LINES == 1 - if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) { - lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0); - } -# elif LCD_LINES == 2 - if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) { - lcd_write((1 << LCD_DDRAM) + LCD_START_LINE2, 0); - } else if (pos == LCD_START_LINE2 + LCD_DISP_LENGTH) { - lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0); - } -# elif LCD_LINES == 4 - if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) { - lcd_write((1 << LCD_DDRAM) + LCD_START_LINE2, 0); - } else if (pos == LCD_START_LINE2 + LCD_DISP_LENGTH) { - lcd_write((1 << LCD_DDRAM) + LCD_START_LINE3, 0); - } else if (pos == LCD_START_LINE3 + LCD_DISP_LENGTH) { - lcd_write((1 << LCD_DDRAM) + LCD_START_LINE4, 0); - } else if (pos == LCD_START_LINE4 + LCD_DISP_LENGTH) { - lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0); - } -# endif - lcd_waitbusy(); -#endif - lcd_write(c, 1); - } - -} /* lcd_putc */ - -/************************************************************************* -Display string without auto linefeed -Input: string to be displayed -Returns: none -*************************************************************************/ -void lcd_puts(const char *s) -/* print string on lcd (no auto linefeed) */ -{ - register char c; - - while ((c = *s++)) { - lcd_putc(c); - } - -} /* lcd_puts */ - -/************************************************************************* -Display string from program memory without auto linefeed -Input: string from program memory be be displayed -Returns: none -*************************************************************************/ -void lcd_puts_p(const char *progmem_s) -/* print string from program memory on lcd (no auto linefeed) */ -{ - register char c; - - while ((c = pgm_read_byte(progmem_s++))) { - lcd_putc(c); - } - -} /* lcd_puts_p */ - -/************************************************************************* -Initialize display and select type of cursor -Input: dispAttr LCD_DISP_OFF display off - LCD_DISP_ON display on, cursor off - LCD_DISP_ON_CURSOR display on, cursor on - LCD_DISP_CURSOR_BLINK display on, cursor on flashing -Returns: none -*************************************************************************/ -void lcd_init(uint8_t dispAttr) { -#if LCD_IO_MODE - /* - * Initialize LCD to 4 bit I/O mode - */ - - if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (&LCD_RS_PORT == &LCD_DATA0_PORT) && (&LCD_RW_PORT == &LCD_DATA0_PORT) && (&LCD_E_PORT == &LCD_DATA0_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3) && (LCD_RS_PIN == 4) && (LCD_RW_PIN == 5) && (LCD_E_PIN == 6)) { - /* configure all port bits as output (all LCD lines on same port) */ - DDR(LCD_DATA0_PORT) |= 0x7F; - } else if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)) { - /* configure all port bits as output (all LCD data lines on same port, but control lines on different ports) */ - DDR(LCD_DATA0_PORT) |= 0x0F; - DDR(LCD_RS_PORT) |= _BV(LCD_RS_PIN); - DDR(LCD_RW_PORT) |= _BV(LCD_RW_PIN); - DDR(LCD_E_PORT) |= _BV(LCD_E_PIN); - } else { - /* configure all port bits as output (LCD data and control lines on different ports */ - DDR(LCD_RS_PORT) |= _BV(LCD_RS_PIN); - DDR(LCD_RW_PORT) |= _BV(LCD_RW_PIN); - DDR(LCD_E_PORT) |= _BV(LCD_E_PIN); - DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN); - DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN); - DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN); - DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN); - } - delay(LCD_DELAY_BOOTUP); /* wait 16ms or more after power-on */ - - /* initial write to lcd is 8bit */ - LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN); // LCD_FUNCTION>>4; - LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN); // LCD_FUNCTION_8BIT>>4; - lcd_e_toggle(); - delay(LCD_DELAY_INIT); /* delay, busy flag can't be checked here */ - - /* repeat last command */ - lcd_e_toggle(); - delay(LCD_DELAY_INIT_REP); /* delay, busy flag can't be checked here */ - - /* repeat last command a third time */ - lcd_e_toggle(); - delay(LCD_DELAY_INIT_REP); /* delay, busy flag can't be checked here */ - - /* now configure for 4bit mode */ - LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN); // LCD_FUNCTION_4BIT_1LINE>>4 - lcd_e_toggle(); - delay(LCD_DELAY_INIT_4BIT); /* some displays need this additional delay */ - - /* from now the LCD only accepts 4 bit I/O, we can use lcd_command() */ -#else - /* - * Initialize LCD to 8 bit memory mapped mode - */ - - /* enable external SRAM (memory mapped lcd) and one wait state */ - MCUCR = _BV(SRE) | _BV(SRW); - - /* reset LCD */ - delay(LCD_DELAY_BOOTUP); /* wait 16ms after power-on */ - lcd_write(LCD_FUNCTION_8BIT_1LINE, 0); /* function set: 8bit interface */ - delay(LCD_DELAY_INIT); /* wait 5ms */ - lcd_write(LCD_FUNCTION_8BIT_1LINE, 0); /* function set: 8bit interface */ - delay(LCD_DELAY_INIT_REP); /* wait 64us */ - lcd_write(LCD_FUNCTION_8BIT_1LINE, 0); /* function set: 8bit interface */ - delay(LCD_DELAY_INIT_REP); /* wait 64us */ -#endif - -#if KS0073_4LINES_MODE - /* Display with KS0073 controller requires special commands for enabling 4 line mode */ - lcd_command(KS0073_EXTENDED_FUNCTION_REGISTER_ON); - lcd_command(KS0073_4LINES_MODE); - lcd_command(KS0073_EXTENDED_FUNCTION_REGISTER_OFF); -#else - lcd_command(LCD_FUNCTION_DEFAULT); /* function set: display lines */ -#endif - lcd_command(LCD_DISP_OFF); /* display off */ - lcd_clrscr(); /* display clear */ - lcd_command(LCD_MODE_DEFAULT); /* set entry mode */ - lcd_command(dispAttr); /* display/cursor control */ - -} /* lcd_init */ diff --git a/platforms/avr/drivers/hd44780.h b/platforms/avr/drivers/hd44780.h deleted file mode 100644 index 08e60f8a44..0000000000 --- a/platforms/avr/drivers/hd44780.h +++ /dev/null @@ -1,348 +0,0 @@ -/************************************************************************* - Title : C include file for the HD44780U LCD library (lcd.c) - Author: Peter Fleury <pfleury@gmx.ch> http://tinyurl.com/peterfleury - License: GNU General Public License Version 3 - File: $Id: lcd.h,v 1.14.2.4 2015/01/20 17:16:07 peter Exp $ - Software: AVR-GCC 4.x - Hardware: any AVR device, memory mapped mode only for AVR with - memory mapped interface (AT90S8515/ATmega8515/ATmega128) -***************************************************************************/ - -/** - @mainpage - Collection of libraries for AVR-GCC - @author Peter Fleury pfleury@gmx.ch http://tinyurl.com/peterfleury - @copyright (C) 2015 Peter Fleury, GNU General Public License Version 3 - - @file - @defgroup pfleury_lcd LCD library <lcd.h> - @code #include <lcd.h> @endcode - - @brief Basic routines for interfacing a HD44780U-based character LCD display - - LCD character displays can be found in many devices, like espresso machines, laser printers. - The Hitachi HD44780 controller and its compatible controllers like Samsung KS0066U have become an industry standard for these types of displays. - - This library allows easy interfacing with a HD44780 compatible display and can be - operated in memory mapped mode (LCD_IO_MODE defined as 0 in the include file lcd.h.) or in - 4-bit IO port mode (LCD_IO_MODE defined as 1). 8-bit IO port mode is not supported. - - Memory mapped mode is compatible with old Kanda STK200 starter kit, but also supports - generation of R/W signal through A8 address line. - - @see The chapter <a href=" http://homepage.hispeed.ch/peterfleury/avr-lcd44780.html" target="_blank">Interfacing a HD44780 Based LCD to an AVR</a> - on my home page, which shows example circuits how to connect an LCD to an AVR controller. - - @author Peter Fleury pfleury@gmx.ch http://tinyurl.com/peterfleury - - @version 2.0 - - @copyright (C) 2015 Peter Fleury, GNU General Public License Version 3 - -*/ - -#pragma once - -#include <inttypes.h> -#include <avr/pgmspace.h> - -#if (__GNUC__ * 100 + __GNUC_MINOR__) < 405 -# error "This library requires AVR-GCC 4.5 or later, update to newer AVR-GCC compiler !" -#endif - -/**@{*/ - -/* - * LCD and target specific definitions below can be defined in a separate include file with name lcd_definitions.h instead modifying this file - * by adding -D_LCD_DEFINITIONS_FILE to the CDEFS section in the Makefile - * All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h - */ -#ifdef _LCD_DEFINITIONS_FILE -# include "lcd_definitions.h" -#endif - -/** - * @name Definition for LCD controller type - * Use 0 for HD44780 controller, change to 1 for displays with KS0073 controller. - */ -#ifndef LCD_CONTROLLER_KS0073 -# define LCD_CONTROLLER_KS0073 0 /**< Use 0 for HD44780 controller, 1 for KS0073 controller */ -#endif - -/** - * @name Definitions for Display Size - * Change these definitions to adapt setting to your display - * - * These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by - * adding -D_LCD_DEFINITIONS_FILE to the CDEFS section in the Makefile. - * All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h - * - */ -#ifndef LCD_LINES -# define LCD_LINES 2 /**< number of visible lines of the display */ -#endif -#ifndef LCD_DISP_LENGTH -# define LCD_DISP_LENGTH 16 /**< visibles characters per line of the display */ -#endif -#ifndef LCD_LINE_LENGTH -# define LCD_LINE_LENGTH 0x40 /**< internal line length of the display */ -#endif -#ifndef LCD_START_LINE1 -# define LCD_START_LINE1 0x00 /**< DDRAM address of first char of line 1 */ -#endif -#ifndef LCD_START_LINE2 -# define LCD_START_LINE2 0x40 /**< DDRAM address of first char of line 2 */ -#endif -#ifndef LCD_START_LINE3 -# define LCD_START_LINE3 0x14 /**< DDRAM address of first char of line 3 */ -#endif -#ifndef LCD_START_LINE4 -# define LCD_START_LINE4 0x54 /**< DDRAM address of first char of line 4 */ -#endif -#ifndef LCD_WRAP_LINES -# define LCD_WRAP_LINES 0 /**< 0: no wrap, 1: wrap at end of visibile line */ -#endif - -/** - * @name Definitions for 4-bit IO mode - * - * The four LCD data lines and the three control lines RS, RW, E can be on the - * same port or on different ports. - * Change LCD_RS_PORT, LCD_RW_PORT, LCD_E_PORT if you want the control lines on - * different ports. - * - * Normally the four data lines should be mapped to bit 0..3 on one port, but it - * is possible to connect these data lines in different order or even on different - * ports by adapting the LCD_DATAx_PORT and LCD_DATAx_PIN definitions. - * - * Adjust these definitions to your target.\n - * These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by - * adding \b -D_LCD_DEFINITIONS_FILE to the \b CDEFS section in the Makefile. - * All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h - * - */ -#define LCD_IO_MODE 1 /**< 0: memory mapped mode, 1: IO port mode */ - -#if LCD_IO_MODE - -# ifndef LCD_PORT -# define LCD_PORT PORTA /**< port for the LCD lines */ -# endif -# ifndef LCD_DATA0_PORT -# define LCD_DATA0_PORT LCD_PORT /**< port for 4bit data bit 0 */ -# endif -# ifndef LCD_DATA1_PORT -# define LCD_DATA1_PORT LCD_PORT /**< port for 4bit data bit 1 */ -# endif -# ifndef LCD_DATA2_PORT -# define LCD_DATA2_PORT LCD_PORT /**< port for 4bit data bit 2 */ -# endif -# ifndef LCD_DATA3_PORT -# define LCD_DATA3_PORT LCD_PORT /**< port for 4bit data bit 3 */ -# endif -# ifndef LCD_DATA0_PIN -# define LCD_DATA0_PIN 4 /**< pin for 4bit data bit 0 */ -# endif -# ifndef LCD_DATA1_PIN -# define LCD_DATA1_PIN 5 /**< pin for 4bit data bit 1 */ -# endif -# ifndef LCD_DATA2_PIN -# define LCD_DATA2_PIN 6 /**< pin for 4bit data bit 2 */ -# endif -# ifndef LCD_DATA3_PIN -# define LCD_DATA3_PIN 7 /**< pin for 4bit data bit 3 */ -# endif -# ifndef LCD_RS_PORT -# define LCD_RS_PORT LCD_PORT /**< port for RS line */ -# endif -# ifndef LCD_RS_PIN -# define LCD_RS_PIN 3 /**< pin for RS line */ -# endif -# ifndef LCD_RW_PORT -# define LCD_RW_PORT LCD_PORT /**< port for RW line */ -# endif -# ifndef LCD_RW_PIN -# define LCD_RW_PIN 2 /**< pin for RW line */ -# endif -# ifndef LCD_E_PORT -# define LCD_E_PORT LCD_PORT /**< port for Enable line */ -# endif -# ifndef LCD_E_PIN -# define LCD_E_PIN 1 /**< pin for Enable line */ -# endif - -#elif defined(__AVR_AT90S4414__) || defined(__AVR_AT90S8515__) || defined(__AVR_ATmega64__) || defined(__AVR_ATmega8515__) || defined(__AVR_ATmega103__) || defined(__AVR_ATmega128__) || defined(__AVR_ATmega161__) || defined(__AVR_ATmega162__) -/* - * memory mapped mode is only supported when the device has an external data memory interface - */ -# define LCD_IO_DATA 0xC000 /* A15=E=1, A14=RS=1 */ -# define LCD_IO_FUNCTION 0x8000 /* A15=E=1, A14=RS=0 */ -# define LCD_IO_READ 0x0100 /* A8 =R/W=1 (R/W: 1=Read, 0=Write */ - -#else -# error "external data memory interface not available for this device, use 4-bit IO port mode" - -#endif - -/** - * @name Definitions of delays - * Used to calculate delay timers. - * Adapt the F_CPU define in the Makefile to the clock frequency in Hz of your target - * - * These delay times can be adjusted, if some displays require different delays.\n - * These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by - * adding \b -D_LCD_DEFINITIONS_FILE to the \b CDEFS section in the Makefile. - * All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h - */ -#ifndef LCD_DELAY_BOOTUP -# define LCD_DELAY_BOOTUP 16000 /**< delay in micro seconds after power-on */ -#endif -#ifndef LCD_DELAY_INIT -# define LCD_DELAY_INIT 5000 /**< delay in micro seconds after initialization command sent */ -#endif -#ifndef LCD_DELAY_INIT_REP -# define LCD_DELAY_INIT_REP 64 /**< delay in micro seconds after initialization command repeated */ -#endif -#ifndef LCD_DELAY_INIT_4BIT -# define LCD_DELAY_INIT_4BIT 64 /**< delay in micro seconds after setting 4-bit mode */ -#endif -#ifndef LCD_DELAY_BUSY_FLAG -# define LCD_DELAY_BUSY_FLAG 4 /**< time in micro seconds the address counter is updated after busy flag is cleared */ -#endif -#ifndef LCD_DELAY_ENABLE_PULSE -# define LCD_DELAY_ENABLE_PULSE 1 /**< enable signal pulse width in micro seconds */ -#endif - -/** - * @name Definitions for LCD command instructions - * The constants define the various LCD controller instructions which can be passed to the - * function lcd_command(), see HD44780 data sheet for a complete description. - */ - -/* instruction register bit positions, see HD44780U data sheet */ -#define LCD_CLR 0 /* DB0: clear display */ -#define LCD_HOME 1 /* DB1: return to home position */ -#define LCD_ENTRY_MODE 2 /* DB2: set entry mode */ -#define LCD_ENTRY_INC 1 /* DB1: 1=increment, 0=decrement */ -#define LCD_ENTRY_SHIFT 0 /* DB2: 1=display shift on */ -#define LCD_ON 3 /* DB3: turn lcd/cursor on */ -#define LCD_ON_DISPLAY 2 /* DB2: turn display on */ -#define LCD_ON_CURSOR 1 /* DB1: turn cursor on */ -#define LCD_ON_BLINK 0 /* DB0: blinking cursor ? */ -#define LCD_MOVE 4 /* DB4: move cursor/display */ -#define LCD_MOVE_DISP 3 /* DB3: move display (0-> cursor) ? */ -#define LCD_MOVE_RIGHT 2 /* DB2: move right (0-> left) ? */ -#define LCD_FUNCTION 5 /* DB5: function set */ -#define LCD_FUNCTION_8BIT 4 /* DB4: set 8BIT mode (0->4BIT mode) */ -#define LCD_FUNCTION_2LINES 3 /* DB3: two lines (0->one line) */ -#define LCD_FUNCTION_10DOTS 2 /* DB2: 5x10 font (0->5x7 font) */ -#define LCD_CGRAM 6 /* DB6: set CG RAM address */ -#define LCD_DDRAM 7 /* DB7: set DD RAM address */ -#define LCD_BUSY 7 /* DB7: LCD is busy */ - -/* set entry mode: display shift on/off, dec/inc cursor move direction */ -#define LCD_ENTRY_DEC 0x04 /* display shift off, dec cursor move dir */ -#define LCD_ENTRY_DEC_SHIFT 0x05 /* display shift on, dec cursor move dir */ -#define LCD_ENTRY_INC_ 0x06 /* display shift off, inc cursor move dir */ -#define LCD_ENTRY_INC_SHIFT 0x07 /* display shift on, inc cursor move dir */ - -/* display on/off, cursor on/off, blinking char at cursor position */ -#define LCD_DISP_OFF 0x08 /* display off */ -#define LCD_DISP_ON 0x0C /* display on, cursor off */ -#define LCD_DISP_ON_BLINK 0x0D /* display on, cursor off, blink char */ -#define LCD_DISP_ON_CURSOR 0x0E /* display on, cursor on */ -#define LCD_DISP_ON_CURSOR_BLINK 0x0F /* display on, cursor on, blink char */ - -/* move cursor/shift display */ -#define LCD_MOVE_CURSOR_LEFT 0x10 /* move cursor left (decrement) */ -#define LCD_MOVE_CURSOR_RIGHT 0x14 /* move cursor right (increment) */ -#define LCD_MOVE_DISP_LEFT 0x18 /* shift display left */ -#define LCD_MOVE_DISP_RIGHT 0x1C /* shift display right */ - -/* function set: set interface data length and number of display lines */ -#define LCD_FUNCTION_4BIT_1LINE 0x20 /* 4-bit interface, single line, 5x7 dots */ -#define LCD_FUNCTION_4BIT_2LINES 0x28 /* 4-bit interface, dual line, 5x7 dots */ -#define LCD_FUNCTION_8BIT_1LINE 0x30 /* 8-bit interface, single line, 5x7 dots */ -#define LCD_FUNCTION_8BIT_2LINES 0x38 /* 8-bit interface, dual line, 5x7 dots */ - -#define LCD_MODE_DEFAULT ((1 << LCD_ENTRY_MODE) | (1 << LCD_ENTRY_INC)) - -/** - * @name Functions - */ - -/** - @brief Initialize display and select type of cursor - @param dispAttr \b LCD_DISP_OFF display off\n - \b LCD_DISP_ON display on, cursor off\n - \b LCD_DISP_ON_CURSOR display on, cursor on\n - \b LCD_DISP_ON_CURSOR_BLINK display on, cursor on flashing - @return none -*/ -extern void lcd_init(uint8_t dispAttr); - -/** - @brief Clear display and set cursor to home position - @return none -*/ -extern void lcd_clrscr(void); - -/** - @brief Set cursor to home position - @return none -*/ -extern void lcd_home(void); - -/** - @brief Set cursor to specified position - - @param x horizontal position\n (0: left most position) - @param y vertical position\n (0: first line) - @return none -*/ -extern void lcd_gotoxy(uint8_t x, uint8_t y); - -/** - @brief Display character at current cursor position - @param c character to be displayed - @return none -*/ -extern void lcd_putc(char c); - -/** - @brief Display string without auto linefeed - @param s string to be displayed - @return none -*/ -extern void lcd_puts(const char *s); - -/** - @brief Display string from program memory without auto linefeed - @param progmem_s string from program memory be be displayed - @return none - @see lcd_puts_P -*/ -extern void lcd_puts_p(const char *progmem_s); - -/** - @brief Send LCD controller instruction command - @param cmd instruction to send to LCD controller, see HD44780 data sheet - @return none -*/ -extern void lcd_command(uint8_t cmd); - -/** - @brief Send data byte to LCD controller - - Similar to lcd_putc(), but without interpreting LF - @param data byte to send to LCD controller, see HD44780 data sheet - @return none -*/ -extern void lcd_data(uint8_t data); - -/** - @brief macros for automatically storing string constant in program memory -*/ -#define lcd_puts_P(__s) lcd_puts_p(PSTR(__s)) - -/**@}*/ |