HD44780 driver rework (#16370)
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7 changed files with 796 additions and 940 deletions
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/****************************************************************************
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Title: HD44780U LCD library
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Author: Peter Fleury <pfleury@gmx.ch> http://tinyurl.com/peterfleury
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License: GNU General Public License Version 3
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File: $Id: lcd.c,v 1.15.2.2 2015/01/17 12:16:05 peter Exp $
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Software: AVR-GCC 3.3
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Target: any AVR device, memory mapped mode only for AT90S4414/8515/Mega
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DESCRIPTION
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Basic routines for interfacing a HD44780U-based text lcd display
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Originally based on Volker Oth's lcd library,
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changed lcd_init(), added additional constants for lcd_command(),
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added 4-bit I/O mode, improved and optimized code.
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Library can be operated in memory mapped mode (LCD_IO_MODE=0) or in
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4-bit IO port mode (LCD_IO_MODE=1). 8-bit IO port mode not supported.
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Memory mapped mode compatible with Kanda STK200, but supports also
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generation of R/W signal through A8 address line.
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USAGE
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See the C include lcd.h file for a description of each function
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*****************************************************************************/
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#include <inttypes.h>
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#include <avr/io.h>
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#include <avr/pgmspace.h>
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#include <util/delay.h>
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#include "hd44780.h"
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/*
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** constants/macros
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*/
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#define DDR(x) (*(&x - 1)) /* address of data direction register of port x */
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#if defined(__AVR_ATmega64__) || defined(__AVR_ATmega128__)
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/* on ATmega64/128 PINF is on port 0x00 and not 0x60 */
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# define PIN(x) (&PORTF == &(x) ? _SFR_IO8(0x00) : (*(&x - 2)))
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#else
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# define PIN(x) (*(&x - 2)) /* address of input register of port x */
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#endif
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#if LCD_IO_MODE
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# define lcd_e_delay() _delay_us(LCD_DELAY_ENABLE_PULSE)
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# define lcd_e_high() LCD_E_PORT |= _BV(LCD_E_PIN);
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# define lcd_e_low() LCD_E_PORT &= ~_BV(LCD_E_PIN);
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# define lcd_e_toggle() toggle_e()
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# define lcd_rw_high() LCD_RW_PORT |= _BV(LCD_RW_PIN)
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# define lcd_rw_low() LCD_RW_PORT &= ~_BV(LCD_RW_PIN)
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# define lcd_rs_high() LCD_RS_PORT |= _BV(LCD_RS_PIN)
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# define lcd_rs_low() LCD_RS_PORT &= ~_BV(LCD_RS_PIN)
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#endif
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#if LCD_IO_MODE
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# if LCD_LINES == 1
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# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_4BIT_1LINE
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# else
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# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_4BIT_2LINES
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# endif
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#else
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# if LCD_LINES == 1
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# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_8BIT_1LINE
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# else
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# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_8BIT_2LINES
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# endif
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#endif
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#if LCD_CONTROLLER_KS0073
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# if LCD_LINES == 4
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# define KS0073_EXTENDED_FUNCTION_REGISTER_ON 0x2C /* |0|010|1100 4-bit mode, extension-bit RE = 1 */
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# define KS0073_EXTENDED_FUNCTION_REGISTER_OFF 0x28 /* |0|010|1000 4-bit mode, extension-bit RE = 0 */
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# define KS0073_4LINES_MODE 0x09 /* |0|000|1001 4 lines mode */
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# endif
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#endif
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/*
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** function prototypes
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*/
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#if LCD_IO_MODE
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static void toggle_e(void);
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#endif
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/*
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** local functions
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*/
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/*************************************************************************
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delay for a minimum of <us> microseconds
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the number of loops is calculated at compile-time from MCU clock frequency
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*************************************************************************/
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#define delay(us) _delay_us(us)
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#if LCD_IO_MODE
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/* toggle Enable Pin to initiate write */
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static void toggle_e(void) {
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lcd_e_high();
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lcd_e_delay();
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lcd_e_low();
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}
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#endif
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/*************************************************************************
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Low-level function to write byte to LCD controller
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Input: data byte to write to LCD
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rs 1: write data
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0: write instruction
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Returns: none
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*************************************************************************/
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#if LCD_IO_MODE
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static void lcd_write(uint8_t data, uint8_t rs) {
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unsigned char dataBits;
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if (rs) { /* write data (RS=1, RW=0) */
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lcd_rs_high();
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} else { /* write instruction (RS=0, RW=0) */
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lcd_rs_low();
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}
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lcd_rw_low(); /* RW=0 write mode */
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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)) {
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/* configure data pins as output */
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DDR(LCD_DATA0_PORT) |= 0x0F;
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/* output high nibble first */
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dataBits = LCD_DATA0_PORT & 0xF0;
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LCD_DATA0_PORT = dataBits | ((data >> 4) & 0x0F);
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lcd_e_toggle();
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/* output low nibble */
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LCD_DATA0_PORT = dataBits | (data & 0x0F);
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lcd_e_toggle();
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/* all data pins high (inactive) */
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LCD_DATA0_PORT = dataBits | 0x0F;
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} else {
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/* configure data pins as output */
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DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN);
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DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN);
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DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN);
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DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN);
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/* output high nibble first */
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LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN);
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LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN);
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LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN);
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LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN);
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if (data & 0x80) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
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if (data & 0x40) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
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if (data & 0x20) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
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if (data & 0x10) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
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lcd_e_toggle();
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/* output low nibble */
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LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN);
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LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN);
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LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN);
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LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN);
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if (data & 0x08) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
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if (data & 0x04) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
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if (data & 0x02) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
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if (data & 0x01) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
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lcd_e_toggle();
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/* all data pins high (inactive) */
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LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN);
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LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN);
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LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN);
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LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN);
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}
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}
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#else
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# define lcd_write(d, rs) \
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if (rs) \
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*(volatile uint8_t *)(LCD_IO_DATA) = d; \
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else \
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*(volatile uint8_t *)(LCD_IO_FUNCTION) = d;
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/* rs==0 -> write instruction to LCD_IO_FUNCTION */
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/* rs==1 -> write data to LCD_IO_DATA */
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#endif
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/*************************************************************************
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Low-level function to read byte from LCD controller
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Input: rs 1: read data
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0: read busy flag / address counter
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Returns: byte read from LCD controller
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*************************************************************************/
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#if LCD_IO_MODE
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static uint8_t lcd_read(uint8_t rs) {
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uint8_t data;
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if (rs)
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lcd_rs_high(); /* RS=1: read data */
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else
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lcd_rs_low(); /* RS=0: read busy flag */
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lcd_rw_high(); /* RW=1 read mode */
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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)) {
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DDR(LCD_DATA0_PORT) &= 0xF0; /* configure data pins as input */
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lcd_e_high();
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lcd_e_delay();
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data = PIN(LCD_DATA0_PORT) << 4; /* read high nibble first */
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lcd_e_low();
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lcd_e_delay(); /* Enable 500ns low */
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lcd_e_high();
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lcd_e_delay();
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data |= PIN(LCD_DATA0_PORT) & 0x0F; /* read low nibble */
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lcd_e_low();
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} else {
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/* configure data pins as input */
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DDR(LCD_DATA0_PORT) &= ~_BV(LCD_DATA0_PIN);
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DDR(LCD_DATA1_PORT) &= ~_BV(LCD_DATA1_PIN);
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DDR(LCD_DATA2_PORT) &= ~_BV(LCD_DATA2_PIN);
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DDR(LCD_DATA3_PORT) &= ~_BV(LCD_DATA3_PIN);
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/* read high nibble first */
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lcd_e_high();
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lcd_e_delay();
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data = 0;
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if (PIN(LCD_DATA0_PORT) & _BV(LCD_DATA0_PIN)) data |= 0x10;
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if (PIN(LCD_DATA1_PORT) & _BV(LCD_DATA1_PIN)) data |= 0x20;
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if (PIN(LCD_DATA2_PORT) & _BV(LCD_DATA2_PIN)) data |= 0x40;
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if (PIN(LCD_DATA3_PORT) & _BV(LCD_DATA3_PIN)) data |= 0x80;
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lcd_e_low();
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lcd_e_delay(); /* Enable 500ns low */
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/* read low nibble */
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lcd_e_high();
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lcd_e_delay();
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if (PIN(LCD_DATA0_PORT) & _BV(LCD_DATA0_PIN)) data |= 0x01;
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if (PIN(LCD_DATA1_PORT) & _BV(LCD_DATA1_PIN)) data |= 0x02;
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if (PIN(LCD_DATA2_PORT) & _BV(LCD_DATA2_PIN)) data |= 0x04;
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if (PIN(LCD_DATA3_PORT) & _BV(LCD_DATA3_PIN)) data |= 0x08;
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lcd_e_low();
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}
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return data;
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}
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#else
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# define lcd_read(rs) (rs) ? *(volatile uint8_t *)(LCD_IO_DATA + LCD_IO_READ) : *(volatile uint8_t *)(LCD_IO_FUNCTION + LCD_IO_READ)
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/* rs==0 -> read instruction from LCD_IO_FUNCTION */
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/* rs==1 -> read data from LCD_IO_DATA */
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#endif
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/*************************************************************************
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loops while lcd is busy, returns address counter
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*************************************************************************/
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static uint8_t lcd_waitbusy(void)
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{
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register uint8_t c;
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/* wait until busy flag is cleared */
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while ((c = lcd_read(0)) & (1 << LCD_BUSY)) {
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}
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/* the address counter is updated 4us after the busy flag is cleared */
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delay(LCD_DELAY_BUSY_FLAG);
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/* now read the address counter */
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return (lcd_read(0)); // return address counter
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} /* lcd_waitbusy */
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/*************************************************************************
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Move cursor to the start of next line or to the first line if the cursor
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is already on the last line.
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*************************************************************************/
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static inline void lcd_newline(uint8_t pos) {
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register uint8_t addressCounter;
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#if LCD_LINES == 1
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addressCounter = 0;
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#endif
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#if LCD_LINES == 2
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if (pos < (LCD_START_LINE2))
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addressCounter = LCD_START_LINE2;
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else
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addressCounter = LCD_START_LINE1;
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#endif
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#if LCD_LINES == 4
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# if KS0073_4LINES_MODE
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if (pos < LCD_START_LINE2)
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addressCounter = LCD_START_LINE2;
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else if ((pos >= LCD_START_LINE2) && (pos < LCD_START_LINE3))
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addressCounter = LCD_START_LINE3;
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else if ((pos >= LCD_START_LINE3) && (pos < LCD_START_LINE4))
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addressCounter = LCD_START_LINE4;
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else
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addressCounter = LCD_START_LINE1;
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# else
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if (pos < LCD_START_LINE3)
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addressCounter = LCD_START_LINE2;
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else if ((pos >= LCD_START_LINE2) && (pos < LCD_START_LINE4))
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addressCounter = LCD_START_LINE3;
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else if ((pos >= LCD_START_LINE3) && (pos < LCD_START_LINE2))
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addressCounter = LCD_START_LINE4;
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else
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addressCounter = LCD_START_LINE1;
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# endif
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#endif
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lcd_command((1 << LCD_DDRAM) + addressCounter);
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} /* lcd_newline */
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/*
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** PUBLIC FUNCTIONS
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*/
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/*************************************************************************
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Send LCD controller instruction command
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Input: instruction to send to LCD controller, see HD44780 data sheet
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Returns: none
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*************************************************************************/
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void lcd_command(uint8_t cmd) {
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lcd_waitbusy();
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lcd_write(cmd, 0);
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}
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/*************************************************************************
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Send data byte to LCD controller
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Input: data to send to LCD controller, see HD44780 data sheet
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Returns: none
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*************************************************************************/
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void lcd_data(uint8_t data) {
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lcd_waitbusy();
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lcd_write(data, 1);
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}
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/*************************************************************************
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Set cursor to specified position
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Input: x horizontal position (0: left most position)
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y vertical position (0: first line)
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Returns: none
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*************************************************************************/
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void lcd_gotoxy(uint8_t x, uint8_t y) {
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#if LCD_LINES == 1
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lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x);
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#endif
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#if LCD_LINES == 2
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if (y == 0)
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lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x);
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else
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lcd_command((1 << LCD_DDRAM) + LCD_START_LINE2 + x);
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#endif
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#if LCD_LINES == 4
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if (y == 0)
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lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x);
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else if (y == 1)
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lcd_command((1 << LCD_DDRAM) + LCD_START_LINE2 + x);
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else if (y == 2)
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lcd_command((1 << LCD_DDRAM) + LCD_START_LINE3 + x);
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else /* y==3 */
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lcd_command((1 << LCD_DDRAM) + LCD_START_LINE4 + x);
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#endif
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} /* lcd_gotoxy */
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/*************************************************************************
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*************************************************************************/
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int lcd_getxy(void) {
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return lcd_waitbusy();
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}
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/*************************************************************************
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Clear display and set cursor to home position
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*************************************************************************/
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void lcd_clrscr(void) {
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lcd_command(1 << LCD_CLR);
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}
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/*************************************************************************
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Set cursor to home position
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*************************************************************************/
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void lcd_home(void) {
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lcd_command(1 << LCD_HOME);
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}
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/*************************************************************************
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Display character at current cursor position
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Input: character to be displayed
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Returns: none
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*************************************************************************/
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void lcd_putc(char c) {
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uint8_t pos;
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pos = lcd_waitbusy(); // read busy-flag and address counter
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if (c == '\n') {
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lcd_newline(pos);
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} else {
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#if LCD_WRAP_LINES == 1
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# if LCD_LINES == 1
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if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) {
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lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0);
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}
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# elif LCD_LINES == 2
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if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) {
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lcd_write((1 << LCD_DDRAM) + LCD_START_LINE2, 0);
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} else if (pos == LCD_START_LINE2 + LCD_DISP_LENGTH) {
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lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0);
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}
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# elif LCD_LINES == 4
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if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) {
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lcd_write((1 << LCD_DDRAM) + LCD_START_LINE2, 0);
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} else if (pos == LCD_START_LINE2 + LCD_DISP_LENGTH) {
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lcd_write((1 << LCD_DDRAM) + LCD_START_LINE3, 0);
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} else if (pos == LCD_START_LINE3 + LCD_DISP_LENGTH) {
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lcd_write((1 << LCD_DDRAM) + LCD_START_LINE4, 0);
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} else if (pos == LCD_START_LINE4 + LCD_DISP_LENGTH) {
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lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0);
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}
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# endif
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lcd_waitbusy();
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#endif
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lcd_write(c, 1);
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}
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} /* lcd_putc */
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/*************************************************************************
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Display string without auto linefeed
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Input: string to be displayed
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Returns: none
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*************************************************************************/
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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 */
|
||||
|
|
@ -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))
|
||||
|
||||
/**@}*/
|
||||
Loading…
Add table
Add a link
Reference in a new issue