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Diffstat (limited to 'platforms/avr/drivers/hd44780.c')
| -rw-r--r-- | platforms/avr/drivers/hd44780.c | 542 |
1 files changed, 0 insertions, 542 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 */ |