diff options
Diffstat (limited to 'drivers/avr')
| -rw-r--r-- | drivers/avr/hd44780.c | 592 | ||||
| -rw-r--r-- | drivers/avr/hd44780.h | 371 |
2 files changed, 963 insertions, 0 deletions
diff --git a/drivers/avr/hd44780.c b/drivers/avr/hd44780.c new file mode 100644 index 000000000..51414d8f9 --- /dev/null +++ b/drivers/avr/hd44780.c @@ -0,0 +1,592 @@ +/**************************************************************************** + 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/drivers/avr/hd44780.h b/drivers/avr/hd44780.h new file mode 100644 index 000000000..7421c8131 --- /dev/null +++ b/drivers/avr/hd44780.h @@ -0,0 +1,371 @@ +#ifndef LCD_H +#define LCD_H +/************************************************************************* + 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 + +*/ + +#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)) + +/**@}*/ + +#endif //LCD_H + |