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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,303 @@ /* File: lcd.c Version: 0.1.0 Date: Feb. 25, 2006 C header file for HD44780 LCD module using a 74HCT164 serial in, parallel out out shift register to operate the LCD in 8-bit mode. Example schematic usuing a Powertip PC-1202A LCD available at http://www.micahcarrick.com Uses the avr-libc library for gcc (avr-gcc). **************************************************************************** Copyright (C) 2006 Micah Carrick <[email protected]> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA **************************************************************************** */ #include "lcd.h" #include <inttypes.h> #include <avr/io.h> #include <util/delay.h> #include <avr/pgmspace.h> /* * Turns the backlight on or off. The LCD_BACKLIGHT_PIN should be defined as * the pin connected to the backlight control of the LCD. * * Parameters: * backlight_on 0=off, 1=on */ void lcd_backlight(int backlight_on) { if (backlight_on) { /* LCD Backlight on */ LCD_PORT |= _BV(LCD_BACKLIGHT_PIN); } else { /* LCD Backlight off */ LCD_PORT &= ~_BV(LCD_BACKLIGHT_PIN); } } /* * Initializes the LCD. Should be called during the initialization of the * program. * * Parameters: * set_function See LCD_FUNCTION_* definitions in lcd.h * set_entry_mode See LCD_CMD_ENTRY_* definitions in lcd.h * on See LCD_CMD_ON_* definitions in lcd.h */ void lcd_initialize(uint8_t set_function, uint8_t set_entry_mode, uint8_t on) { DDR(LCD_PORT) |=(1<<LCD_ENABLE_PIN); DDR(LCD_PORT) |=(1<<LCD_RSDS_PIN); DDR(LCD_PORT) |=(1<<LCD_CLOCK_PIN); DDR(LCD_PORT) |=(1<<LCD_BACKLIGHT_PIN); /* 20ms delay while LCD powers on */ _delay_ms(16); /* Write 0x30 to LCD and wait 5 mS for the instruction to complete */ lcd_load_byte(0x30); lcd_send_cmd(); _delay_ms(5); /* Write 0x30 to LCD and wait 160 uS for instruction to complete */ lcd_load_byte(0x30); lcd_send_cmd(); _delay_us(120); /* Write 0x30 AGAIN to LCD and wait 160 uS */ lcd_load_byte(0x30); lcd_send_cmd(); _delay_us(120); /* Set function and wait 40uS */ lcd_load_byte(set_function); lcd_send_cmd(); /* Turn off the display and wait 40uS */ lcd_load_byte(LCD_CMD_OFF); lcd_send_cmd(); /* Clear display and wait 1.64mS */ lcd_load_byte(LCD_CMD_CLEAR); lcd_send_cmd(); _delay_ms(2); /* Set entry mode and wait 40uS */ lcd_load_byte(set_entry_mode); lcd_send_cmd(); /* Turn display back on and wait 40uS */ lcd_load_byte(on); lcd_send_cmd(); }; /* * Loads a byte into the shift register (74'164). Does NOT load into the LCD. * * Parameters: * out_byte The byte to load into the '164. */ void lcd_load_byte(uint8_t out_byte) { /* make sure clock is low */ LCD_PORT &= ~_BV(LCD_CLOCK_PIN); int i; for(i=0; i<8; i++) { /* loop through bits */ if (out_byte & 0x80) { /* this bit is high */ LCD_PORT |=_BV(LCD_RSDS_PIN); } else { /* this bit is low */ LCD_PORT &= ~_BV(LCD_RSDS_PIN); } out_byte = out_byte << 1; /* pulse the the shift register clock */ LCD_PORT |= _BV(LCD_CLOCK_PIN); LCD_PORT &= ~_BV(LCD_CLOCK_PIN); } } /* * Loads the byte in the '164 shift register into the LCD as a command. The * '164 should already be loaded with the data using lcd_load_byte(). */ void lcd_send_cmd(void) { /* Data in '164 is a command, so RS must be low (0) */ LCD_PORT &= ~_BV(LCD_RSDS_PIN); lcd_strobe_E(); _delay_us(40); } /* * Loads the byte in the '164 shift register into the LCD as a character. The * '164 should already be loaded with the data using lcd_load_byte(). */ void lcd_send_char(void) { /* Data in '164 is a character, so RS must be high (1) */ LCD_PORT |= _BV(LCD_RSDS_PIN); lcd_strobe_E(); _delay_us(40); } /* * Loads the byte into the shift register and then sends it to the LCD as a char * Parameters: * c The byte (character) to display */ void lcd_putc(const char c) { lcd_load_byte(c); lcd_send_char(); } /************************************************************************* 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 */ /************************************************************************* 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 ( y==0 ) lcd_load_byte(LCD_LINE_1+x); else lcd_load_byte(LCD_LINE_2+x); lcd_send_cmd(); } void lcd_clrscr(void){ lcd_load_byte(1); lcd_send_cmd(); } /* * Strobes the E signal on the LCD to "accept" the byte in the '164. The RS * line determines wheter the byte is a character or a command. */ void lcd_strobe_E(void) { /* strobe E signal */ LCD_PORT |= _BV(LCD_ENABLE_PIN); _delay_us(450); LCD_PORT &= ~_BV(LCD_ENABLE_PIN); } /* * Moves the cursor to the home position. */ void lcd_cursor_home() { lcd_load_byte(LCD_CMD_HOME); lcd_send_cmd(); } /* * Moves the cursor to the specified position. * Parameters: * line Line (row) * pos Position on that line (column) */ void lcd_move_cursor(uint8_t line, uint8_t pos) { lcd_load_byte(line+pos); lcd_send_cmd(); } /* * Moves the cursor a number of spaces to the right * Parameters: * spaces Number of spaces to move */ void lcd_inc_cursor(uint8_t spaces) { while (spaces--) { lcd_load_byte(LCD_CMD_CURSOR_RIGHT); lcd_send_cmd(); } } /* * Moves the cursor a number of spaces to the left * Parameters: * spaces Number of spaces to move */ void lcd_dec_cursor(uint8_t spaces) { while (spaces--) { lcd_load_byte(LCD_CMD_CURSOR_LEFT); lcd_send_cmd(); } } This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,94 @@ /* File: lcd.h Version: 0.1.0 Date: Feb. 25, 2006 C header file for HD44780 LCD module using a 74HCT164 serial in, parallel out out shift register to operate the LCD in 8-bit mode. Example schematic usuing a Powertip PC-1202A LCD available at http://www.micahcarrick.com Uses the avr-libc library for gcc (avr-gcc). **************************************************************************** Copyright (C) 2006 Micah Carrick <[email protected]> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA **************************************************************************** */ #ifndef _LCD_H #define _LCD_H #include <inttypes.h> /* AVR port and pins connected to '164 and/or LCD */ #define LCD_PORT PORTD #define LCD_ENABLE_PIN 4 #define LCD_RSDS_PIN 5 #define LCD_CLOCK_PIN 6 #define LCD_BACKLIGHT_PIN 7 /* number of columns on the display */ #define LCD_COLS 16 #define LCD_LINES 2 /* LCD commands */ #define LCD_CLR 0x00 #define LCD_CMD_HOME 0x02 /* cursor home */ #define LCD_CMD_ENTRY_DEC 0x04 /* decrement, no shift */ #define LCD_CMD_ENTRY_DEC_SHIFT 0x05 /* decrement with shift */ #define LCD_CMD_ENTRY_INC 0x06 /* increment, no shift */ #define LCD_CMD_ENTRY_INC_SHIFT 0x07 /* increment with shift */ #define LCD_CMD_CLEAR 0x01 /* clear, cursor home */ #define LCD_CMD_OFF 0x08 /* display off */ #define LCD_CMD_ON 0x0C /* display on, cursor off */ #define LCD_CMD_ON_BLINK 0x0D /* display on, cursor off, blink char */ #define LCD_CMD_ON_CURSOR 0x0E /* display on, cursor on */ #define LCD_CMD_ON_CURSOR_BLINK 0x0F /* display on, cursor on, blink char */ #define LCD_CMD_CURSOR_LEFT 0x10 /* decrement cursor (left) */ #define LCD_CMD_CURSOR_RIGHT 0x14 /* increment cursor (right) */ #define LCD_CMD_SHIFT_LEFT 0x18 /* shift (left) */ #define LCD_CMD_SHIFT_RIGHT 0x1C /* shift (right)*/ #define LCD_LINE_1 0x80 /* bit 7 is always set: 0x80 = 0x00 */ #define LCD_LINE_2 0xC0 /* 2nd line at position 40 */ /* function set: (always 8-bit with the shift-register circuit I'm using */ #define LCD_FUNCTION_8x1 0x30 /* 5x7 characters, single line display */ #define LCD_FUNCTION_8x2 0x38 /* 5x7 characters, 2 line display */ /* F_CPU is used by delay routines from util/delay.h. May already be defined */ #ifndef F_CPU #define F_CPU 8000000UL /* 8 MHz CPU clock */ #endif #define DDR(x) (*(&x - 1)) /* functions */ void lcd_backlight(int); void lcd_initialize(uint8_t, uint8_t, uint8_t); void lcd_load_byte(uint8_t); void lcd_send_cmd(void); void lcd_send_char(void); void lcd_strobe_E(void); void lcd_cursor_home(); void lcd_move_cursor(uint8_t, uint8_t); void lcd_inc_cursor(uint8_t); void lcd_dec_cursor(uint8_t); void lcd_clrscr(void); void lcd_putc(const char c); void lcd_puts(const char *s); void lcd_puts_p(const char *progmem_s); void lcd_gotoxy(uint8_t x, uint8_t y); #endif This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,24 @@ #include <avr/io.h> #include <util/delay.h> #include "lcd.h" int main(void){ //DDRD=0xF0; lcd_initialize(LCD_FUNCTION_8x2, LCD_CMD_ENTRY_INC, LCD_CMD_ON); lcd_puts("hello word !"); lcd_gotoxy(0,1); lcd_puts("serial lcd lib"); _delay_ms(700); lcd_clrscr(); lcd_puts("bym"); lcd_gotoxy(0,1); lcd_puts("www.ellab.ir"); while(1){ } return 0; }
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