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Ronald Schaten 2008-07-16 05:44:45 +00:00
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5
Changelog.txt Normal file
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$Id: Changelog.txt,v 1.1 2008/07/16 05:44:45 rschaten Exp $
* Release 080716
- initial release

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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
Everyone is permitted to copy and distribute verbatim copies
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# $Id: Makefile,v 1.1 2008/07/16 05:44:45 rschaten Exp $
# microcontroller settings
F_CPU = 1000000UL
MCU = atmega8
# usb programmer:
AVRDUDE = avrdude -p $(MCU) -c avrispv2 -P usb -B 10
COMPILE = avr-gcc -Wall -Os -std=c99 -I../common -I. -mmcu=$(MCU) -DF_CPU=$(F_CPU) -Wa,-ahlms=$(<:.c=.lst) #-DDEBUG_LEVEL=2
OBJECTS = main.o twislave.o
TODAY=`date "+%y%m%d"`
DIR=`basename \`pwd\``
PACKETNAME=$(DIR)_$(TODAY)
all: usage
usage:
@echo "Usage of this makefile:"
@echo "make firmware create firmware"
@echo "make program send firmware to the device"
@echo "make fuses set fuses of the device"
@echo "make docs create documentation"
@echo "make tarball packs a tarball for shipping"
@echo "make clean tidy the directory"
@echo
@echo "For further information, consult the documentation in Readme.txt."
# symbolic targets:
firmware: main.hex
cp main.hex main_$(TODAY).hex
.c.o:
$(COMPILE) -c $< -o $@
.c.s:
$(COMPILE) -S $< -o $@
program: firmware
$(AVRDUDE) -U flash:w:main.hex
fuses:
$(AVRDUDE) -u -U hfuse:w:0x99:m -U lfuse:w:0xc1:m
clean:
rm -f main.lst main.obj main.cof main.list main.map main.eep.hex main.bin *.o main.s *.lst main.hex
rm -rf htmldoc latexdoc Readme.txt refman.pdf
rm -f $(PACKETNAME).tar.gz
# file targets:
main.bin: $(OBJECTS)
$(COMPILE) -o main.bin $(OBJECTS)
main.hex: main.bin
rm -f main.hex main.eep.hex
avr-objcopy -j .text -j .data -O ihex main.bin main.hex
avr-size main.hex
# doc generation
docs: readme pdf
@echo "documentation created"
readme: doxygen
echo "This file is auto-generated from the content of <main.c>." > Readme.txt
echo "You'll have more fun if you read the HTML-content in htmldoc or the PDF." >> Readme.txt
echo >> Readme.txt
lynx -dump htmldoc/main.html >> Readme.txt
pdf: doxygen
make -C latexdoc
mv latexdoc/refman.pdf .
rm -rf latexdoc
doxygen:
doxygen project.doxygen
circuitpdf:
@echo "converting circuits to pdf"
for i in circuit/*.ps; do ps2pdf -sPAPERSIZE=a4 $$i $$(echo $$i | sed -e "s/\.ps$$/.pdf/"); done
tarball: firmware circuitpdf clean docs
@echo
@echo
@echo "I assume you updated the Changelog...? Press Enter to continue..."
@read
[ -e "main_$(TODAY).hex" ] || exit
rm --force $(PACKETNAME).tar.gz; \
tar --directory=.. \
--exclude=$(DIR)/Makefile \
--exclude=CVS \
--exclude=*.ps \
--exclude=main.hex \
--create \
--gzip \
--verbose \
--file ../$(PACKETNAME).tar.gz $(DIR)
rm -f main_$(TODAY).hex

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EESchema-DOCLIB Version 2.0 15/7/2008-18:58:00
#
$CMP R
D Resistance
K R DEV
$ENDCMP
#
#End Doc Library

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EESchema-LIBRARY Version 15/7/2008-18:58:00
#
#
# GND
#
DEF ~GND #PWR 0 0 Y Y 1 F P
F0 "#PWR" 0 0 30 H I C C
F1 "GND" 0 -70 30 H I C C
DRAW
P 4 0 1 4 -50 0 0 -50 50 0 -50 0 N
X GND 1 0 0 0 U 30 30 1 1 W N
ENDDRAW
ENDDEF
#
# LED
#
DEF LED D 0 40 Y N 1 F N
F0 "D" 0 100 50 H V C C
F1 "LED" 0 -100 50 H V C C
DRAW
P 3 0 1 0 -50 50 50 0 -50 -50 F
P 3 0 1 0 65 -40 110 -80 105 -55 N
P 3 0 1 0 80 -25 125 -65 120 -40 N
P 2 0 1 0 50 50 50 -50 N
X K 2 200 0 150 L 40 40 1 1 P
X A 1 -200 0 150 R 40 40 1 1 P
ENDDRAW
ENDDEF
#
# MEGA8-P
#
DEF MEGA8-P IC 0 40 Y Y 1 L N
F0 "IC" -700 -1500 50 H V L B
F1 "MEGA8-P" -200 1300 50 H V L B
F2 "atmel-DIL28-3" 0 150 50 H I C C
DRAW
P 2 1 0 0 -700 1200 800 1200 N
P 2 1 0 0 800 1200 800 -1300 N
P 2 1 0 0 800 -1300 -700 -1300 N
P 2 1 0 0 -700 -1300 -700 1200 N
X PB5(SCK) 19 1000 -1200 200 L 40 40 1 1 B
X PB4(MISO) 18 1000 -1100 200 L 40 40 1 1 B
X PB3(MOSI/OC2) 17 1000 -1000 200 L 40 40 1 1 B
X PB2(SS/OC1B) 16 1000 -900 200 L 40 40 1 1 B
X PB1(OC1A) 15 1000 -800 200 L 40 40 1 1 B
X PB0(ICP) 14 1000 -700 200 L 40 40 1 1 B
X PD7(AIN1) 13 1000 -500 200 L 40 40 1 1 B
X PD6(AIN0) 12 1000 -400 200 L 40 40 1 1 B
X PD5(T1) 11 1000 -300 200 L 40 40 1 1 B
X PD4(XCK/T0) 6 1000 -200 200 L 40 40 1 1 B
X PD3(INT1) 5 1000 -100 200 L 40 40 1 1 B
X PD2(INT0) 4 1000 0 200 L 40 40 1 1 B
X PD1(TXD) 3 1000 100 200 L 40 40 1 1 B
X PD0(RXD) 2 1000 200 200 L 40 40 1 1 B
X PC5(ADC5/SCL) 28 1000 600 200 L 40 40 1 1 B
X PC4(ADC4/SDA) 27 1000 700 200 L 40 40 1 1 B
X PC3(ADC3) 26 1000 800 200 L 40 40 1 1 B
X PC2(ADC2) 25 1000 900 200 L 40 40 1 1 B
X PC1(ADC1) 24 1000 1000 200 L 40 40 1 1 B
X PC0(ADC0) 23 1000 1100 200 L 40 40 1 1 B
X VCC@1 7 -900 -300 200 R 40 40 1 1 B
X GND@1 8 -900 -100 200 R 40 40 1 1 B
X PB7(XTAL2/TOSC2) 10 -900 200 200 R 40 40 1 1 B
X PB6(XTAL1/TOSC1) 9 -900 400 200 R 40 40 1 1 B
X AVCC 20 -900 700 200 R 40 40 1 1 B
X AREF 21 -900 800 200 R 40 40 1 1 B
X AGND 22 -900 900 200 R 40 40 1 1 B
X PC6(/RESET) 1 -900 1100 200 R 40 40 1 1 B I
ENDDRAW
ENDDEF
#
# R
#
DEF R R 0 0 N Y 1 F N
F0 "R" 80 0 50 V V C C
F1 "R" 0 0 50 V V C C
$FPLIST
R?
SM0603
SM0805
$ENDFPLIST
DRAW
S -40 150 40 -150 0 1 8 N
X ~ 1 0 250 100 D 60 60 1 1 P
X ~ 2 0 -250 100 U 60 60 1 1 P
ENDDRAW
ENDDEF
#
# VCC
#
DEF VCC #PWR 0 0 Y Y 1 F P
F0 "#PWR" 0 100 30 H I C C
F1 "VCC" 0 100 30 H V C C
DRAW
P 3 0 1 4 0 0 0 30 0 30 N
C 0 50 20 0 1 4 N
X VCC 1 0 0 0 U 20 20 0 0 W N
ENDDRAW
ENDDEF
#
#EndLibrary

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update=15/7/2008-17:03:19
last_client=eeschema
[general]
version=1
RootSch=i2c-ledmatrix.sch
BoardNm=i2c-ledmatrix.brd
[eeschema]
version=1
LibDir=
NetFmt=1
HPGLSpd=20
HPGLDm=15
HPGLNum=1
offX_A4=0
offY_A4=0
offX_A3=0
offY_A3=0
offX_A2=0
offY_A2=0
offX_A1=0
offY_A1=0
offX_A0=0
offY_A0=0
offX_A=0
offY_A=0
offX_B=0
offY_B=0
offX_C=0
offY_C=0
offX_D=0
offY_D=0
offX_E=0
offY_E=0
RptD_X=0
RptD_Y=100
RptLab=1
SimCmd=
UseNetN=0
LabSize=60
[eeschema/libraries]
LibName1=power
LibName2=atmel
LibName3=device
LibName4=conn
LibName5=linear
LibName6=regul
LibName7=74xx
LibName8=cmos4000
LibName9=adc-dac
LibName10=memory
LibName11=xilinx
LibName12=special
LibName13=microcontrollers
LibName14=dsp
LibName15=microchip
LibName16=analog_switches
LibName17=motorola
LibName18=texas
LibName19=intel
LibName20=audio
LibName21=interface
LibName22=digital-audio
LibName23=philips
LibName24=display
LibName25=cypress
LibName26=siliconi
LibName27=contrib
LibName28=valves

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/**
* \file main.c
* \brief firmware for the i2c-ledmatrix
*
* this is a really simple piece of code, since the main work is done by the
* I2C-library.
* \author Ronald Schaten <ronald@schatenseite.de>
* \version $Id: main.c,v 1.1 2008/07/16 05:44:45 rschaten Exp $
*
* Permission to use, copy, modify, and distribute this software and its
* documentation under the terms of the GNU General Public License is hereby
* granted. No representations are made about the suitability of this software
* for any purpose. It is provided "as is" without express or implied warranty.
* See the GNU General Public License for more details.
*/
/**
* \mainpage I2C LED Matrix
*
* \section sec_intro Introduction
*
* This project turns an AVR ATmega8 microcontroller into a LED controller for
* a matrix of 8x8 LEDs. The controller is acting as I2C-slave, so you can
* control the patterns to display via this bus (also known as TWI, Two Wire
* Interface).
*
* \section sec_purpose Purpose
*
* For my next project, I need to display number values on
* seven-segment-displays. I bought a bunch of 4-digit-displays a while ago,
* now I'm going to put them to a use. They are built with four digits in one
* case, and 12 pins on the underside. Eight of them are the cathodes of the
* segments (seven segments plus dot), four are the anodes. One for each digit.
*
* You can imagine these modules as a matrix of four times eight LEDs, as can
* be seen in the included circuit. I use two of these, so I have a matrix of
* eight times eight LEDs.
*
* The rows and columns of this matrix are connected to the microcontroller, so
* it can power them row by row. This has two advantages: at first a maximum of
* eight LEDs is powered at a time, so power consumption is lowered. And at
* second you need only 16 pins of the controller to address a total of 64
* LEDs.
*
* Driving the LEDs in this way makes them flicker a bit, but the controller is
* fast enough to keep the flickering way above the level you would be able to
* recognize.
*
* I could have connected my display modules directly to the main controller of
* my next project, but I don't have enough free pins on that. As a further
* benefit, multiplexing the LEDs on a second controller makes the main program
* easier to write, since I don't have to mind the timing. So the solution is
* to use a cheap ATmega8 as LED driver and use the I2C-bus to tell it what to
* display.
*
* \section sec_i2c I2C communication
*
* The ATmega8 has a built-in hardware I2C-interface, so it doesn't take very
* much code to use it. Nevertheless, I used a little library that <strong>Uwe
* Grosse-Wortmann (uwegw)</strong> published on <a
* href="http://www.roboternetz.de/wissen/index.php/TWI_Slave_mit_avr-gcc">roboternetz.de</a>.
* I only reformatted it a bit to make the code resemble my style. It is well
* commented, but the comments are in german. Since only one global array, one
* init-function and an interrupt service routine are used, it shouldn't be too
* hard for english-speaking people to figure out how it is used.
*
* \subsection sec_usage Usage
*
* On the other end of the communication, I used the excellent <strong>Procyon
* AVRlib written by Pascal Stang</strong>. You can find it <a
* href="http://hubbard.engr.scu.edu/embedded/avr/avrlib">here</a>.
*
* A basic code example would look like this:
*
* \code
* #define I2C_LEDMATRIX 0x10 // address of the device
* timerInit(); // initialize timers
* timerPause(100); // give everything a little time to settle
* i2cInit(); // initialize i2c function library
* timerPause(100); // wait a bit more
* while (1) { // endless loop
* uint8_t buffer[9]; // prepare buffer
* // loop until 255
* for (uint8_t i = 0; i <= 255; i++) {
* // set all bytes of the buffer to value i
* memset(buffer, i, sizeof(buffer));
* // send the buffer via I2C-bus
* i2cMasterSend(I2C_LEDMATRIX, sizeof(buffer), buffer);
* timerPause(500); // wait, so you have the time to watch
* }
* }
* \endcode
*
* Note: the buffer doesn't contain any numbers that should be displayed on
* 7segment-displays. At least not in this example. It only holds bit-patterns.
*
* \subsection sec_numbers Displaying numbers
*
* If you solder 7segment displays to the unit and intend to display numbers or
* characters on it, you need to define them on the master-side of the bus. I
* didn't include the definitions in this library because I want the master to
* have the full flexibility of displaying whatever it wants to, even if it are
* no numbers.
*
* However, if you are going to use 7segment displays, definition of the
* numbers still depends on how you soldered them to the controller. I don't
* know if the pin-outs are commonly standardized.
*
* To give an example of how you would implement this, here is a fragment of
* code that defines hexadecimal numbers for usage on my displays:
*
* \code
* // Names of the segments:
* // aaaaa
* // f b
* // f b
* // ggggg
* // e c
* // e c
* // ddddd h
* uint8_t characters[16];
* // c e g a h f b d
* characters[ 0] = (1 << 0) | (1 << 1) | (0 << 2) | (1 << 3) | (0 << 4) | (1 << 5) | (1 << 6) | (1 << 7); // 0
* characters[ 1] = (1 << 0) | (0 << 1) | (0 << 2) | (0 << 3) | (0 << 4) | (0 << 5) | (1 << 6) | (0 << 7); // 1
* characters[ 2] = (0 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (0 << 4) | (0 << 5) | (1 << 6) | (1 << 7); // 2
* characters[ 3] = (1 << 0) | (0 << 1) | (1 << 2) | (1 << 3) | (0 << 4) | (0 << 5) | (1 << 6) | (1 << 7); // 3
* characters[ 4] = (1 << 0) | (0 << 1) | (1 << 2) | (0 << 3) | (0 << 4) | (1 << 5) | (1 << 6) | (0 << 7); // 4
* characters[ 5] = (1 << 0) | (0 << 1) | (1 << 2) | (1 << 3) | (0 << 4) | (1 << 5) | (0 << 6) | (1 << 7); // 5
* characters[ 6] = (1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (0 << 4) | (1 << 5) | (0 << 6) | (1 << 7); // 6
* characters[ 7] = (1 << 0) | (0 << 1) | (0 << 2) | (1 << 3) | (0 << 4) | (0 << 5) | (1 << 6) | (0 << 7); // 7
* characters[ 8] = (1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (0 << 4) | (1 << 5) | (1 << 6) | (1 << 7); // 8
* characters[ 9] = (1 << 0) | (0 << 1) | (1 << 2) | (1 << 3) | (0 << 4) | (1 << 5) | (1 << 6) | (1 << 7); // 9
* characters[10] = (1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (0 << 4) | (1 << 5) | (1 << 6) | (0 << 7); // a
* characters[11] = (1 << 0) | (1 << 1) | (1 << 2) | (0 << 3) | (0 << 4) | (1 << 5) | (0 << 6) | (1 << 7); // b
* characters[12] = (0 << 0) | (1 << 1) | (0 << 2) | (1 << 3) | (0 << 4) | (1 << 5) | (0 << 6) | (1 << 7); // c
* characters[13] = (1 << 0) | (1 << 1) | (1 << 2) | (0 << 3) | (0 << 4) | (0 << 5) | (1 << 6) | (1 << 7); // d
* characters[14] = (0 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (0 << 4) | (1 << 5) | (0 << 6) | (1 << 7); // e
* characters[15] = (0 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (0 << 4) | (1 << 5) | (0 << 6) | (0 << 7); // f
* \endcode
*
* \section sec_install Building and installing
*
* The firmware is built and installed on the controller with the included
* makefile. You might need to need to customize it to match your individual
* environment.
*
* If you take a brand-new controller you shouldn't have to hassle with the
* fuses of the controller. The internal oscillator at 1MHz is enough to keep
* the display flicker-free. The settings I used are included in the makefile,
* so you can use it to reset controllers you already changed in other
* projects.
*
* Oh, and if you want the slave to use an I2C-address different from 0x10: no
* problem. Just change it in the code.
*
* \section sec_drawbacks Drawbacks
*
* Till now, the device worked in all situations I tested it in. So far
* everything is fine.
*
* \section sec_files Files in the distribution
*
* - \e Readme.txt: Documentation, created from the htmldoc-directory.
* - \e htmldoc/: Documentation, created from main.c.
* - \e refman.pdf: Documentation, created from main.c.
* - \e main.c: Source code of the firmware.
* - \e main_*.hex: Compiled version of the firmware.
* - \e twislave.c: I2C-library.
* - \e twislave.h: I2C-library.
* - \e project.doxygen: Support for creating the documentation.
* - \e License.txt: Public license for all contents of this project.
* - \e Changelog.txt: Logfile documenting changes in soft-, firm- and
* hardware.
*
* \section sec_thanks Thanks!
*
* I'd like to thank the authors of the libraries I used: <strong>Uwe
* Grosse-Wortmann (uwegw)</strong> for the I2C-slave and <strong>Pascal
* Stang</strong> for the Procyon AVRlib.
*
* \section sec_license About the license
*
* My work is licensed under the GNU General Public License (GPL). A copy of
* the GPL is included in License.txt.
*
* <b>(c) 2008 by Ronald Schaten - http://www.schatenseite.de</b>
*/
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/wdt.h>
#include <util/delay.h>
#include <avr/pgmspace.h> // keeping constants in program memory
#include "twislave.h"
/**
* initialize hardware
*/
void init_ports(void){
// set DDR for all digit-pins
DDRB = 0xff;
DDRC |= (1 << PINC0) | (1 << PINC1);
// unset PORT for all digit-pins
PORTB = 0x00;
PORTC &= ~((1 << PINC0) | (1 << PINC1));
DDRD = 0x00; // segment selector
PORTD = 0x00; // segments, has to be 0x00
}
/**
* select which digit should be displayed
* \param digit number of the digit
*/
void selectDigit(uint8_t digit) {
switch (digit) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
PORTB = (1 << digit);
PORTC &= ~((1 << PINC0) | (1 << PINC1));
break;
case 6:
PORTB = 0x00;
PORTC &= ~((1 << PINC1));
PORTC |= (1 << PINC0);
break;
case 7:
PORTB = 0x00;
PORTC &= ~((1 << PINC0));
PORTC |= (1 << PINC1);
break;
default:
PORTB = 0x00;
PORTC = 0x00;
}
}
/**
* set output of the currently selected digit
* \param byte bit-pattern to show
*/
void showByte(uint8_t byte) {
DDRD = byte;
}
/**
* show a pattern on a certain digit (or row, if you don't use 7segment
* displays). the output is cleared before selecting the new digit, so there
* won't be 'shadows' on the display.
* \param digit number of the digit
* \param byte bit-pattern to show
*/
void showDigitByte(uint8_t digit, uint8_t byte) {
showByte(0x00);
selectDigit(digit);
showByte(byte);
}
/**
* main-function. initializes everything and contains the main loop which
* controls the actual output. the rxbuffer[] is filled from the I2C-library,
* so we just have go through the array and display its values on the
* corresponding digit.
* \return An integer. Whatever... :-)
*/
int main(void) {
// initialize output ports
init_ports();
// init watchdog
wdt_enable(WDTO_15MS); // 15ms watchdog
// init I2C communication
init_twi_slave(0x10);
while (1) {
wdt_reset(); // feed the watchdog
for (uint8_t digit = 0; digit <= 7; digit++) {
// display all eight digits
showDigitByte(digit, rxbuffer[digit]);
}
}
return 0;
}

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/**
* \file twislave.c
* \brief I2C slave library. taken from http://www.roboternetz.de/wissen/index.php/TWI_Slave_mit_avr-gcc
* \author Uwe Grosse-Wortmann (uwegw), reformatted by Ronald Schaten <ronald@schatenseite.de>
* \version $Id: twislave.c,v 1.1 2008/07/16 05:44:45 rschaten Exp $
*
* License: GNU GPL v2 (see License.txt)
*/
#include <util/twi.h> // enthaelt z. B. die Bezeichnungen fuer die Statuscodes in TWSR
#include <avr/interrupt.h> // dient zur behandlung der Interrupts
#include <stdint.h> // definiert den Datentyp uint8_t
#include "twislave.h"
// Bei zu alten AVR-GCC-Versionen werden die Interrupts anders genutzt, daher
// in diesem Fall mit Fehlermeldung abbrechen
#if (__GNUC__ * 100 + __GNUC_MINOR__) < 304
# error "This library requires AVR-GCC 3.4.5 or later, update to newer AVR-GCC compiler!"
#endif
// Schutz vor unsinnigen Buffergroessen
#if (buffer_size > 254)
# error Buffer zu gross gewaehlt! Maximal 254 Bytes erlaubt.
#endif
#if (buffer_size < 2)
# error Buffer muss mindestens zwei Byte gross sein!
#endif
volatile uint8_t buffer_adr; //< "Adressregister" fuer den Buffer
/**
* Initalisierung des TWI-Interface. Muss zu Beginn aufgerufen werden, sowie
* bei einem Wechsel der Slave Adresse.
* \param adr gewuenschte Slave-Adresse
*/
void init_twi_slave(uint8_t adr) {
TWAR = adr; // Adresse setzen
TWCR &= ~(1 << TWSTA) | (1 << TWSTO);
TWCR |= (1 << TWEA) | (1 << TWEN) | (1 << TWIE);
buffer_adr = 0xff;
sei();
}
// Je nach Statuscode in TWSR muessen verschiedene Bitmuster in TWCR geschreiben werden (siehe Tabellen im Datenblatt).
// Makros fuer die verwendeten Bitmuster:
// ACK nach empfangenen Daten senden/ ACK nach gesendeten Daten erwarten
#define TWCR_ACK TWCR = (1 << TWEN) | (1 << TWIE) | (1 << TWINT) | (1 << TWEA) | (0 << TWSTA) | (0 << TWSTO) | (0 << TWWC);
// NACK nach empfangenen Daten senden/ NACK nach gesendeten Daten erwarten
#define TWCR_NACK TWCR = (1 << TWEN) | (1 << TWIE) | (1 << TWINT) | (0 << TWEA) | (0 << TWSTA) | (0 << TWSTO) | (0 << TWWC);
// switched to the non adressed slave mode...
#define TWCR_RESET TWCR = (1 << TWEN) | (1 << TWIE) | (1 << TWINT) | (1 << TWEA) | (0 << TWSTA) | (0 << TWSTO) | (0 << TWWC);
// Die Bitmuster fuer TWCR_ACK und TWCR_RESET sind gleich. Dies ist kein Fehler und dient nur der Uebersicht!
/**
* ISR, die bei einem Ereignis auf dem Bus ausgeloest wird. Im Register TWSR
* befindet sich dann ein Statuscode, anhand dessen die Situation festgestellt
* werden kann.
*/
ISR(TWI_vect) {
uint8_t data = 0;
// TWI-Statusregister pruefen und noetige Aktion bestimmen
switch (TW_STATUS) {
case TW_SR_SLA_ACK: // 0x60 Slave Receiver, wurde adressiert
TWCR_ACK; // naechstes Datenbyte empfangen, ACK danach
buffer_adr = 0xFF; // Bufferposition ist undefiniert
break;
case TW_SR_DATA_ACK: // 0x80 Slave Receiver,Daten empfangen
data = TWDR; // Empfangene Daten auslesen
if (buffer_adr == 0xFF) { // erster Zugriff, Bufferposition setzen
// Kontrolle ob gewuenschte Adresse im erlaubten bereich
if (data <= buffer_size) {
buffer_adr = data; // Bufferposition wie adressiert setzen
} else {
buffer_adr = 0; // Adresse auf Null setzen. Ist das sinnvoll?
}
TWCR_ACK; // naechstes Datenbyte empfangen, ACK danach, um naechstes Byte anzufordern
} else { // weiterer Zugriff, Daten empfangen
rxbuffer[buffer_adr] = data; // Daten in Buffer schreiben
buffer_adr++; // Buffer-Adresse weiterzaehlen fuer naechsten Schreibzugriff
if (buffer_adr < (buffer_size - 1)) { // im Buffer ist noch Platz fuer mehr als ein Byte
TWCR_ACK; // naechstes Datenbyte empfangen, ACK danach, um naechstes Byte anzufordern
} else { // es kann nur noch ein Byte kommen, dann ist der Buffer voll
TWCR_NACK; // letztes Byte lesen, dann NACK, um vollen Buffer zu signaliseren
}
}
break;
case TW_ST_SLA_ACK: // ?!?
case TW_ST_DATA_ACK: // 0xB8 Slave Transmitter, weitere Daten wurden angefordert
if (buffer_adr == 0xFF) { // zuvor keine Leseadresse angegeben!
buffer_adr = 0;
}
TWDR = txbuffer[buffer_adr]; // Datenbyte senden
buffer_adr++; // bufferadresse fuer naechstes Byte weiterzaehlen
if (buffer_adr < (buffer_size - 1)) { // im Buffer ist mehr als ein Byte, das gesendet werden kann
TWCR_ACK; // naechstes Byte senden, danach ACK erwarten
} else {
TWCR_NACK; // letztes Byte senden, danach NACK erwarten
}
break;
case TW_ST_DATA_NACK: // 0xC0 Keine Daten mehr gefordert
case TW_SR_DATA_NACK: // 0x88
case TW_ST_LAST_DATA: // 0xC8 Last data byte in TWDR has been transmitted (TWEA = "0"); ACK has been received
case TW_SR_STOP: // 0xA0 STOP empfangen
default:
TWCR_RESET; // Uebertragung beenden, warten bis zur naechsten Adressierung
break;
}
}

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/**
* \file twislave.h
* \brief I2C slave library. taken from http://www.roboternetz.de/wissen/index.php/TWI_Slave_mit_avr-gcc
*
* Betrieb eines AVRs mit Hardware-TWI-Schnittstelle als Slave. Zu Beginn muss
* init_twi_slave mit der gewuenschten Slave-Adresse als Parameter aufgerufen
* werden. Der Datenaustausch mit dem Master erfolgt ueber die Buffer rxbuffer
* und txbuffer, auf die von Master und Slave zugegriffen werden kann. rxbuffer
* und txbuffer sind globale Variablen (Array aus uint8_t).
* Die Ansteuerung des rxbuffers, in den der Master schreiben kann, erfolgt
* aehnlich wie bei einem normalen I2C-EEPROM.
* Man sendet zunaechst die Bufferposition, an die man schreiben will, und dann
* die Daten. Die Bufferposition wird automatisch hochgezaehlt, sodass man
* mehrere Datenbytes hintereinander schreiben kann, ohne jedesmal die
* Bufferadresse zu schreiben.
* Um den txbuffer vom Master aus zu lesen, uebertraegt man zunaechst in einem
* Schreibzugriff die gewuenschte Bufferposition und liest dann nach einem
* repeated start die Daten aus. Die Bufferposition wird automatisch
* hochgezaehlt, sodass man mehrere Datenbytes hintereinander lesen kann, ohne
* jedesmal die Bufferposition zu schreiben.
*
* Autor: Uwe Grosse-Wortmann (uwegw)
* Status: Testphase, keine Garantie fuer ordnungsgemaesse Funktion!
* letze Aenderungen:
* 23.03.07 Makros fuer TWCR eingefuegt. Abbruch des Sendens, wenn der TXbuffer
* komplett gesendet wurde.
* 24.03.07 verbotene Buffergroessen abgefangen
* 25.03.07 noetige externe Bibliotheken eingebunden
*
* Abgefangene Fehlbedienung durch den Master:
* - Lesen ueber die Grenze des txbuffers hinaus
* - Schreiben ueber die Grenzen des rxbuffers hinaus
* - Angabe einer ungueltigen Schreib/Lese-Adresse
* - Lesezugriff, ohne vorher Leseadresse geschrieben zu haben
*
* \author Uwe Grosse-Wortmann (uwegw), reformatted by Ronald Schaten <ronald@schatenseite.de>
* \version $Id: twislave.h,v 1.1 2008/07/16 05:44:45 rschaten Exp $
*
* License: GNU GPL v2 (see License.txt)
*/
#ifndef _TWISLAVE_H
#define _TWISLAVE_H
#include <util/twi.h> // enthaelt z. B. die Bezeichnungen fuer die Statuscodes in TWSR
#include <avr/interrupt.h> // dient zur behandlung der Interrupts
#include <stdint.h> // definiert den Datentyp uint8_t
// von Benutzer konfigurierbare Einstellungen
#define buffer_size 9 ///< Groesse der Buffer in Byte (2..254)
// Globale Variablen, die vom Hauptprogramm genutzt werden
/**
* Der Buffer, in dem die empfangenen Daten gespeichert werden. Der Slave
* funktioniert aehnlich wie ein normales Speicher-IC [I2C-EEPROM], man sendet
* die Adresse, an die man schreiben will, dann die Daten, die interne
* Speicher-Adresse wird dabei automatisch hochgezaehlt.
*/
volatile uint8_t rxbuffer[buffer_size];
/**
* Der Sendebuffer, der vom Master ausgelesen werden kann.
*/
volatile uint8_t txbuffer[buffer_size];
// Funktionen, die vom Hauptprogramm aufgerufen werden koennen
void init_twi_slave(uint8_t adr);
#endif //#ifdef _TWISLAVE_H