diff options
Diffstat (limited to 'drivers/avr/hd44780.c')
| -rw-r--r-- | drivers/avr/hd44780.c | 536 | 
1 files changed, 0 insertions, 536 deletions
| diff --git a/drivers/avr/hd44780.c b/drivers/avr/hd44780.c deleted file mode 100644 index f71069dece..0000000000 --- a/drivers/avr/hd44780.c +++ /dev/null @@ -1,536 +0,0 @@ -/**************************************************************************** - Title:     HD44780U LCD library - Author:    Peter Fleury <[email protected]>  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 */ | 
