Hab' jetzt mal die i2c-Adaptierung von Fleury mit einer Erweiterung der Seite verbunden
http://computerheld.de/i2clcd/doc/index.html.
Im folgenden erscheinen vier Dateien:
main.c
i2clcd.c
i2clcd.h
i2cmaster.h
i2cmaster.S ist der Assembler-Code... den habe ich mal weg gelassen
CodeBox C
/*
MAIN.C
*/
#include <avr/io.h>
#include "i2cmaster.h" // i2c von Fleury
#include "i2clcd.h" // LCD-Erweiterung
#define Dev24C02 0xA2 // device address of EEPROM 24C02, see datasheet
int main(void)
{
unsigned char ret;
DDRB = 0xff; // use all pins on port B for output
PORTB = 0xff; // (active low LED's )
lcd_init(); //- Display initialization
char string[] = "Hi World";
lcd_print(string); //- Print a string
lcd_gotolr(2,4); //- Move to position (line 2, row 4)
//- Turn cursor off and activate blinking
lcd_command(LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKINGON);
}
CodeBox C
/*****************************************************************************
i2clcd.h - LCD over I2C library
Designed for HD44870 based LCDs with I2C expander PCF8574X
on Atmels AVR MCUs
Copyright (C) 2006 Nico Eichelmann and Thomas Eichelmann
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
You can contact the authors at info@computerheld.de
*****************************************************************************/
#ifndef _I2CLCD_H
#define _I2CLCD_H
//--System-Configuration-Settings------------------------------------------------------------------------------------
#ifndef F_CPU
#define F_CPU 8000000
#endif
#define wait1us _delay_loop_1((F_CPU * 0.000001) / 3)
#define wait1ms _delay_loop_2((F_CPU * 0.001) / 4)
//-------------------------------------------------------------------------------------------------------------------
#include <util/delay.h>
#include <stdbool.h>
#include <stdint.h>
#include "i2cmaster.h"
//--Display-Configuration-Settings-----------------------------------------------------------------------------------
#define LCD_I2C_DEVICE 0x40
#define LCD_LINES 2
#define LCD_ROWS 16
#define LCD_LINE1 0x00
#define LCD_LINE2 0x40
#define LCD_LINE3 0x10
#define LCD_LINE4 0x50
//-------------------------------------------------------------------------------------------------------------------
//--The-following-definitions-are-corresponding-to-the-PIN-Assignment-(see-above)------------------------------------
#define LCD_D4_PIN 0
#define LCD_D5_PIN 1
#define LCD_D6_PIN 2
#define LCD_D7_PIN 3
#define LCD_RS_PIN 4
#define LCD_RW_PIN 5
#define LCD_EMPTY_PIN 6
#define LCD_E_PIN 7
//-------------------------------------------------------------------------------------------------------------------
#define LCD_D0 (1 << LCD_D4_PIN)
#define LCD_D1 (1 << LCD_D5_PIN)
#define LCD_D2 (1 << LCD_D6_PIN)
#define LCD_D3 (1 << LCD_D7_PIN)
#define LCD_D4 (1 << LCD_D4_PIN)
#define LCD_D5 (1 << LCD_D5_PIN)
#define LCD_D6 (1 << LCD_D6_PIN)
#define LCD_D7 (1 << LCD_D7_PIN)
#define LCD_RS (1 << LCD_RS_PIN)
#define LCD_RW (1 << LCD_RW_PIN)
#define LCD_EMPTY (1 << LCD_EMPTY_PIN)
#define LCD_E (1 << LCD_E_PIN)
#define LCD_ADDRESS 0
#define LCD_DATA 1
//-LCD-COMMANDS------------------------------------------------------------------------------------------------------
#define LCD_CLEAR 0x01
#define LCD_HOME 0x02
#define LCD_ENTRYMODE 0x04
#define LCD_INCREASE LCD_ENTRYMODE | 0x02
#define LCD_DECREASE LCD_ENTRYMODE | 0x00
#define LCD_DISPLAYSHIFTON LCD_ENTRYMODE | 0x01
#define LCD_DISPLAYSHIFTOFF LCD_ENTRYMODE | 0x00
#define LCD_DISPLAYMODE 0x08
#define LCD_DISPLAYON LCD_DISPLAYMODE | 0x04
#define LCD_DISPLAYOFF LCD_DISPLAYMODE | 0x00
#define LCD_CURSORON LCD_DISPLAYMODE | 0x02
#define LCD_CURSOROFF LCD_DISPLAYMODE | 0x00
#define LCD_BLINKINGON LCD_DISPLAYMODE | 0x01
#define LCD_BLINKINGOFF LCD_DISPLAYMODE | 0x00
#define LCD_SHIFTMODE 0x10
#define LCD_DISPLAYSHIFT LCD_SHIFTMODE | 0x08
#define LCD_CURSORMOVE LCD_SHIFTMODE | 0x00
#define LCD_RIGHT LCD_SHIFTMODE | 0x04
#define LCD_LEFT LCD_SHIFTMODE | 0x00
#define LCD_CONFIGURATION 0x20
#define LCD_8BIT LCD_CONFIGURATION | 0x10
#define LCD_4BIT LCD_CONFIGURATION | 0x00
#define LCD_2LINE LCD_CONFIGURATION | 0x08
#define LCD_1LINE LCD_CONFIGURATION | 0x00
#define LCD_5X10 LCD_CONFIGURATION | 0x04
#define LCD_5X7 LCD_CONFIGURATION | 0x00
//-------------------------------------------------------------------------------------------------------------------
//-FUNCTIONS---------------------------------------------------------------------------------------------------------
//das extern habe ich mal probiert ohne Erfolg....
extern void lcd_init(void); //- Display initialization sequence
void lcd_write_i2c(unsigned char value); //- Write data to i2c
void lcd_write(unsigned char value); //- Write byte to display with toggle of enable-bit
bool lcd_gotolr(unsigned char line, unsigned char row); //- Go to position
void lcd_putchar(unsigned char value); //- Put char to cursor position
bool lcd_putcharlr(unsigned char line, unsigned char row, unsigned char value); //- Put char to position
void lcd_print(unsigned char *string); //- Print string to cursor position
bool lcd_printlr(unsigned char line, unsigned char row , unsigned char *string); //- Print string to position
bool lcd_printlc(unsigned char line, unsigned char row, unsigned char *string); //- Print string to position
//- (If string is longer than LCD_ROWS
//- overwrite first chars)
bool lcd_printlrc(unsigned char line, unsigned char row, unsigned char *string); //- Print string to position
//- (If string is longer than LCD_ROWS
//- continue in next line)
void lcd_command(unsigned char command); //- Issue a command to the display (use the defined commands above)
bool lcd_nextline(void); //- Go to nextline (if next line > LCD_LINES return false)
unsigned char lcd_read_i2c(void); //- Read data from i2c
unsigned char lcd_read(bool mode); //- Read data from display over i2c
//- (second nibble corresponds to highbyte or lowbyte)
unsigned char lcd_getbyte(bool mode); //- Read one complete byte over i2c from display
bool lcd_getlr(unsigned char *line, unsigned char*row); //- Get line and row (target byte for line, target byte for row)
bool lcd_busy(void); //- Check if busy
void lcd_wait_us(unsigned short us); //- Wait some microseconds
void lcd_wait_ms(unsigned short ms); //- Wait some milliseconds
//-------------------------------------------------------------------------------------------------------------------
#endif
CodeBox C
/*****************************************************************************
i2clcd.c - LCD over I2C library
Designed for HD44870 based LCDs with I2C expander PCF8574X
on Atmels AVR MCUs
Copyright (C) 2006 Nico Eichelmann and Thomas Eichelmann
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
You can contact the authors at info@computerheld.de
*****************************************************************************/
/*
Version 0.1
Requires I2C-Library from Peter Fleury http://jump.to/fleury
See i2clcd.h for description and example.
*/
#include "i2clcd.h"
//- Display initialization sequence
void lcd_init(void)
{
lcd_wait_ms(16); //- Wait for more than 15ms after VDD rises to 4.5V
lcd_write(LCD_D5 | LCD_D4); //- Set interface to 8-bit
lcd_wait_ms(5); //- Wait for more than 4.1ms
lcd_write(LCD_D5 | LCD_D4); //- Set interface to 8-bit
lcd_wait_us(101); //- Wait for more than 100us
lcd_write(LCD_D5 | LCD_D4); //- Set interface to 8-bit
lcd_write(LCD_D5); //- Set interface to 4-bit
//- From now on in 4-bit-Mode
lcd_command(LCD_4BIT | LCD_2LINE | LCD_5X7); //- 2-Lines, 5x7-Matrix
lcd_command(LCD_DISPLAYOFF); //- Display off
lcd_command(LCD_CLEAR); //- Clear Screen
lcd_command(LCD_INCREASE | LCD_DISPLAYSHIFTOFF); //- Entrymode (Display Shift: off, Increment Address Counter)
lcd_command(LCD_DISPLAYON); //- Display on
}
//- Write data to i2c
void lcd_write_i2c(unsigned char value)
{
i2c_start_wait(LCD_I2C_DEVICE+I2C_WRITE);
i2c_write(value);
i2c_stop();
}
//- Write byte to display with toggle of enable-bit
void lcd_write(unsigned char value)
{
lcd_write_i2c(value | LCD_E); //- Set enable to high
lcd_write_i2c(value | LCD_E); //- Send data, keep enable high
lcd_write_i2c(value & (!LCD_E)); //- Set enable to low
}
//- Print string to cursor position
void lcd_print(unsigned char *string)
{
unsigned char i = 0;
while(string[i] != 0x00)
{
lcd_putchar(string[i]);
i++;
}
}
//- Put char to cursor position
void lcd_putchar(unsigned char value)
{
unsigned char lcddata;
lcddata = value;
lcddata >>= 4;
lcddata |= LCD_RS;
lcd_write(lcddata);
lcddata = value;
lcddata &= 0x0F;
lcddata |= LCD_RS;
lcd_write(lcddata);
}
//- Put char to position
bool lcd_putcharlr(unsigned char line, unsigned char row, unsigned char value)
{
if(!lcd_gotolr(line, row)) return false;
lcd_putchar(value);
return true;
}
//- Issue a command to the display (use the defined commands above)
void lcd_command(unsigned char command)
{
unsigned char lcddata;
lcddata = command;
lcddata >>= 4;
lcd_write(lcddata);
lcddata = command;
lcddata &= 0x0F;
lcd_write(lcddata);
}
//- Print string to position (If string is longer than LCD_ROWS overwrite first chars)(line, row, string)
bool lcd_printlc(unsigned char line, unsigned char row, unsigned char *string)
{
unsigned char i;
for(i = 0; string[i] != 0x00; i++)
{
if (!lcd_putcharlr(line, row, string[i])) return false;
row++;
if(row > LCD_ROWS)
{
row = 1;
}
}
return true;
}
//- Print string to position (If string is longer than LCD_ROWS continue in next line)(line, row, string)
bool lcd_printlrc(unsigned char line, unsigned char row, unsigned char *string)
{
unsigned char i;
for(i = 0; string[i] != 0x00; i++)
{
if(!lcd_putcharlr(line, row, string[i])) return false;
row++;
if(row > LCD_ROWS)
{
line++;
row = 1;
}
if(line > LCD_LINES)
{
line = 1;
}
}
return true;
}
//- Print string to position (line, row, string)
bool lcd_printlr(unsigned char line, unsigned char row, unsigned char *string)
{
if(!lcd_gotolr(line, row)) return false;
lcd_print(string);
return true;
}
//- Go to position (line, row)
bool lcd_gotolr(unsigned char line, unsigned char row )
{
unsigned char lcddata;
if(line > LCD_LINES) return false;
if(row > LCD_ROWS) return false;
if((line == 0) || (row == 0) ) return false;
lcddata = LCD_D7;
#if LCD_LINES>=2
if (line == 2) lcddata = LCD_D7 | (LCD_LINE2 >> 4);
#endif
#if LCD_LINES>=3
if (line == 3) lcddata = LCD_D7 | (LCD_LINE3 >> 4);
#endif
#if LCD_LINES>=4
if (line == 4) lcddata = LCD_D7 | (LCD_LINE4 >> 4);
#endif
lcd_write(LCD_E | lcddata);
lcddata = (row-1);
lcd_write(LCD_E | lcddata);
return true;
}
//- Go to nextline (if next line > LCD_LINES return false)
bool lcd_nextline(void)
{
unsigned char line = 0x00, row = 0x00;
lcd_getlr(&line, &row);
if (!lcd_gotolr(line + 1, 1)) return false;
else return true;
}
//- Read data from i2c
unsigned char lcd_read_i2c(void)
{
unsigned char lcddata = 0x00;
i2c_start_wait(LCD_I2C_DEVICE+I2C_READ);
lcddata = i2c_readNak();
i2c_stop();
return lcddata;
}
//- Read data from display over i2c (second nibble corresponds to highbyte or lowbyte)
unsigned char lcd_read(bool mode)
{
unsigned char lcddata;
if(mode == LCD_DATA)
lcd_write_i2c(LCD_E | LCD_RS | LCD_RW | LCD_D4 | LCD_D5 | LCD_D6 | LCD_D7);
else
lcd_write_i2c(LCD_E | LCD_RW | LCD_D4 | LCD_D5 | LCD_D6 | LCD_D7);
lcddata = lcd_read_i2c();
lcd_write_i2c(0x00);
return lcddata;
}
//- Read one complete byte over i2c from display
unsigned char lcd_getbyte(bool mode)
{
unsigned char hib, lob;
hib = lcd_read(mode);
lob = lcd_read(mode);
return (hib << 4) + (lob & 0x0F);
}
//- Get line and row (target byte for line, target byte for row)
bool lcd_getlr(unsigned char *line, unsigned char *row)
{
unsigned char lcddata, tmp;
lcddata = lcd_getbyte(LCD_ADDRESS);
if (lcddata & (1 << 7)) return false;
tmp = lcddata;
tmp &= 0xF0;
switch(tmp)
{
case LCD_LINE1:
*line = 1;
break;
#if LCD_LINES>=2
case LCD_LINE2:
*line = 2;
break;
#endif
#if LCD_LINES>=3
case LCD_LINE3:
*line = 3;
break;
#endif
#if LCD_LINES>=4
case LCD_LINE4:
*line = 4;
break;
#endif
default:
return false;
}
lcddata &= 0x0F;
*row = lcddata + 1;
return true;
}
//- Check if busy
bool lcd_busy(void)
{
unsigned char state = lcd_getbyte(LCD_ADDRESS);
if (state & (1 << 7)) return true;
else return false;
}
//- Wait some microseconds
void lcd_wait_us(unsigned short us)
{
unsigned short i;
for(i = 0; i < us; i++)
{
wait1us;
}
}
//- Wait some milliseconds
void lcd_wait_ms(unsigned short ms)
{
unsigned short i;
for(i = 0; i < ms; i++)
{
wait1ms;
}
}
CodeBox C
// pfleury_ic2master I2C Master library
#ifndef _I2CMASTER_H
#define _I2CMASTER_H
/*************************************************************************
* Title: C include file for the I2C master interface
* (i2cmaster.S or twimaster.c)
* Author: Peter Fleury <pfleury@gmx.ch>
* File: $Id: i2cmaster.h,v 1.12 2015/09/16 09:27:58 peter Exp $
* Software: AVR-GCC 4.x
* Target: any AVR device
* Usage: see Doxygen manual
**************************************************************************/
/**
@file
@defgroup pfleury_ic2master I2C Master library
@code #include <i2cmaster.h> @endcode
@brief I2C (TWI) Master Software Library
Basic routines for communicating with I2C slave devices. This single master
implementation is limited to one bus master on the I2C bus.
This I2c library is implemented as a compact assembler software implementation of the I2C protocol
which runs on any AVR (i2cmaster.S) and as a TWI hardware interface for all AVR with built-in TWI hardware (twimaster.c).
Since the API for these two implementations is exactly the same, an application can be linked either against the
software I2C implementation or the hardware I2C implementation.
Use 4.7k pull-up resistor on the SDA and SCL pin.
Adapt the SCL and SDA port and pin definitions and eventually the delay routine in the module
i2cmaster.S to your target when using the software I2C implementation !
Adjust the CPU clock frequence F_CPU in twimaster.c or in the Makfile when using the TWI hardware implementaion.
@note
The module i2cmaster.S is based on the Atmel Application Note AVR300, corrected and adapted
to GNU assembler and AVR-GCC C call interface.
Replaced the incorrect quarter period delays found in AVR300 with
half period delays.
@author Peter Fleury pfleury@gmx.ch http://tinyurl.com/peterfleury
@copyright (C) 2015 Peter Fleury, GNU General Public License Version 3
@par API Usage Example
The following code shows typical usage of this library, see example test_i2cmaster.c
@code
#include <i2cmaster.h>
#define Dev24C02 0xA2 // device address of EEPROM 24C02, see datasheet
int main(void)
{
unsigned char ret;
i2c_init(); // initialize I2C library
// write 0x75 to EEPROM address 5 (Byte Write)
i2c_start_wait(Dev24C02+I2C_WRITE); // set device address and write mode
i2c_write(0x05); // write address = 5
i2c_write(0x75); // write value 0x75 to EEPROM
i2c_stop(); // set stop conditon = release bus
// read previously written value back from EEPROM address 5
i2c_start_wait(Dev24C02+I2C_WRITE); // set device address and write mode
i2c_write(0x05); // write address = 5
i2c_rep_start(Dev24C02+I2C_READ); // set device address and read mode
ret = i2c_readNak(); // read one byte from EEPROM
i2c_stop();
for(;;);
}
@endcode
*/
/**@{*/
#if (__GNUC__ * 100 + __GNUC_MINOR__) < 304
#error "This library requires AVR-GCC 3.4 or later, update to newer AVR-GCC compiler !"
#endif
#include <avr/io.h>
/** defines the data direction (reading from I2C device) in i2c_start(),i2c_rep_start() */
#define I2C_READ 1
/** defines the data direction (writing to I2C device) in i2c_start(),i2c_rep_start() */
#define I2C_WRITE 0
/**
@brief initialize the I2C master interace. Need to be called only once
@return none
*/
extern void i2c_init(void);
/**
@brief Terminates the data transfer and releases the I2C bus
@return none
*/
extern void i2c_stop(void);
/**
@brief Issues a start condition and sends address and transfer direction
@param addr address and transfer direction of I2C device
@retval 0 device accessible
@retval 1 failed to access device
*/
extern unsigned char i2c_start(unsigned char addr);
/**
@brief Issues a repeated start condition and sends address and transfer direction
@param addr address and transfer direction of I2C device
@retval 0 device accessible
@retval 1 failed to access device
*/
extern unsigned char i2c_rep_start(unsigned char addr);
/**
@brief Issues a start condition and sends address and transfer direction
If device is busy, use ack polling to wait until device ready
@param addr address and transfer direction of I2C device
@return none
*/
extern void i2c_start_wait(unsigned char addr);
/**
@brief Send one byte to I2C device
@param data byte to be transfered
@retval 0 write successful
@retval 1 write failed
*/
extern unsigned char i2c_write(unsigned char data);
/**
@brief read one byte from the I2C device, request more data from device
@return byte read from I2C device
*/
extern unsigned char i2c_readAck(void);
/**
@brief read one byte from the I2C device, read is followed by a stop condition
@return byte read from I2C device
*/
extern unsigned char i2c_readNak(void);
/**
@brief read one byte from the I2C device
Implemented as a macro, which calls either @ref i2c_readAck or @ref i2c_readNak
@param ack 1 send ack, request more data from device<br>
0 send nak, read is followed by a stop condition
@return byte read from I2C device
*/
extern unsigned char i2c_read(unsigned char ack);
#define i2c_read(ack) (ack) ? i2c_readAck() : i2c_readNak();
/**@}*/
#endif
Probleme gibt es beim Kompilieren....
Wie muss man das linken?
So:
CodeBox C
#!/bin/bash
avr-gcc -c -Wall -Os -mmcu=atmega8 -g lcd_vs_i2c.c
avr-gcc -c -Wall -Os -mmcu=atmega8 -g i2clcd.c
avr-gcc -mmcu=atmega8 i2clcd.o lcd_vs_i2c.o -o lcd_vs_i2c.hex
erhalte die Fehler:
CodeBox C
lcd_vs_i2c.c:33: undefined reference to `lcd_init'
lcd_vs_i2c.c:35: undefined reference to `lcd_print'
lcd_vs_i2c.c:36: undefined reference to `lcd_gotolr'
lcd_vs_i2c.c:39: undefined reference to `lcd_command'
Gruß
Ralf
