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$Id: Changelog.txt,v 1.1 2007/01/02 21:30:39 rschaten Exp $
* Release 07010x
- initial release

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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
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# $Id: Makefile,v 1.1 2007/01/02 21:30:39 rschaten Exp $
#
# Creates documentation and tarball for shipping.
TODAY=`date "+%y%m%d"`
DIR=`basename \`pwd\``
PACKETNAME=$(DIR)_$(TODAY)
all: usage
usage:
@echo "Usage of this makefile:"
@echo "make docs create documentation"
@echo "make tarball packs a tarball for shipping"
@echo
@echo "For further information, consult the documentation in Readme.txt."
# doc generation
docs: readme pdf
@echo "documentation created"
readme: doxygen
echo "This file is auto-generated from the content of binarydcf77clock.dox." > 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 binarydcf77clock.doxygen
clean:
rm -rf htmldoc latexdoc Readme.txt refman.pdf
rm -f $(PACKETNAME).tar.gz
make -C firmware clean
fw:
make -C firmware
mv -v firmware/main.hex firmware/main_$(TODAY).hex
tarball: fw clean docs
@echo
@echo
@echo "I assume you updated the Changelog...? Press Enter to continue..."
@read
[ -e "firmware/main_$(TODAY).hex" ] || exit
rm --force $(PACKETNAME).tar.gz; \
tar --directory=.. \
--exclude=$(DIR)/Makefile \
--exclude=CVS \
--exclude=*.ps \
--create \
--gzip \
--verbose \
--file ../$(PACKETNAME).tar.gz $(DIR)

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/**
* \mainpage Binary DCF-77 Clock
*
* \section sec_intro Introduction
*
* In Germany, the official time is transmitted in a signal called DCF-77. You
* can find many descriptions of the signal format on the internet.
*
* The Binary DCF-77 Clock is a simple device to receive and decode the signal
* and display the current date and time in binary form. The signal is received
* in a stock DCF-77 receiver module, decoded with an ATmega8 microcontroller
* and displayed in binary form on an array of LEDs. This array consists of for
* lines with eight LEDs each. The ATmega8 is not able to control 32 LEDs at
* once, so an SAA1064 module is used which is connected via I2C-bus.
*
* The time should be displayed in several different binary formats, the format
* can be selected with a simple button. The formats will be described later.
*
* The distribution contains the firmware for the controller, the schematics,
* the documentation and a copy of the GPL license.
*
* \section sec_install Building and installing
*
* The firmware for this project requires avr-gcc and avr-libc (a C-library for
* the AVR controller). Please read the instructions at
* http://www.nongnu.org/avr-libc/user-manual/install_tools.html for how to
* install the GNU toolchain (avr-gcc, assembler, linker etc.) and avr-libc.
*
* Once you have the GNU toolchain for AVR microcontrollers installed, you can
* run "make" in the subdirectory "firmware". You may need to customize the
* makefile. Also, you might have to edit the array byte[] in main.c, which
* describes the order of the output LEDs. The current order works for me
* because I soldered the LEDs as compact as possible, it's slightly different
* from the layout shown in the circuit.
*
* Also, you may have to edit the Makefile to use your preferred downloader
* with "make program". The current version is built for avrdude with a
* USB connection to an avr109-compatible programmer.
*
* No external crystal is needed, so you don't have to struggle with setting
* any fuse-bits.
*
* After making your changes, you can compile and flash to the device:
*
* \code
* make program
* \endcode
*
* \section sec_usage Usage
*
* Connect the device to a DC power source with 9V. As long as no time has been
* decoded, a running light is shown on the output LED array. The single DCF
* indicator LED should start flashing to indicate that a signal is received.
* It is set to on when the input signal is high, and switched off if the
* signal is low. So you should see it flashing with one flash per second, each
* flash being 100ms or 200ms long.
*
* If the signal is received correctly, after about two minutes the clock
* should be able to tell the correct time.
*
* \subsection sec_reading Reading the time
*
* The time and date are displayed in seven different styles. You can select
* the style by pressing the button for a while. A pattern of lights indicate
* which mode is selected, you can read it as a binary value.
*
* \subsubsection sec_mode1 Mode 1: Time as binary
*
* This simply displays the hours, minutes and seconds as bytes, one after
* each other. The fourth line of the display stays blank.
*
* \subsubsection sec_mode2 Mode 2: Date as binary
*
* This is like the previous, with the difference that it displays the day of
* the month, the month and the year in the first three lines. The last line
* shows the day of the week, monday being a 1, tuesday a 2 and so on.
*
* \subsubsection sec_mode3 Mode 3: Time as BCD
*
* This shows the time as binary coded digits (BCD). The first line displays
* the hours. The left four LEDs indicate the 10-hours, the right four LEDs
* indicate the 1-hours.
*
* In the same way, the second and third line display the minutes and the
* seconds.
*
* \subsubsection sec_mode4 Mode 4: Date as BCD
*
* This is like the previous mode, but the date is displayed.
*
* \subsubsection sec_mode5 Mode 5: Time as BCD (vertically)
*
* This shows the time in a BCD-form as described in mode 3, but the BCD-values
* are put vertically next to each other. So in the first two colums you can
* read the hours, the third column is empty, the fourth and fifth columns show
* the minutes, the sixth is empty and the seventh and eighths indicate the
* seconds.
*
* \subsubsection sec_mode6 Mode 6: Date as BCD (vertically)
*
* This is like mode 5, but it displays the date.
*
* \subsubsection sec_mode7 Mode 7: Unix timestamp
*
* This is probably the least human readable format. It shows a 32-bit value of
* the seconds since january 1st, 1970. :-)
*
* \subsection sec_demo Demo mode
*
* If you connect the clock in a place with a poor DCF-reception, but want to
* demonstrate the functions, you can use the demo mode. To toggle this, you
* can touch and hold the button for about five seconds. Afterwards, you can
* switch through the different display modes. The time displayed will stand
* still, so this can be used to explain the display modes without a hurry.
*
* Switching to demo mode is indicated by all LEDs flashing for a short moment.
* Leaving demo mode shows an empty rectangle for a short moment.
*
* \section sec_drawbacks Drawbacks
*
* I didn't expect the DCF-signal to be so easily disturbed. In my case
* sometimes there is no usable signal left when I put my notebook with WLAN
* next to the clock. Fortunately, the time will be counted further until the
* next 'correct minute' is received.
*
* \section sec_files Files in the distribution
*
* - \e Readme.txt: Documentation, created from the htmldoc-directory.
* - \e firmware: Source code of the controller firmware.
* - \e circuit: Circuit diagrams in PDF and EAGLE 4 format. A free version of
* EAGLE is available for Linux, Mac OS X and Windows from
* http://www.cadsoft.de/.
* - \e License.txt: Public license for all contents of this project.
* - \e Changelog.txt: Logfile documenting changes in firm- and hardware.
* - \e refman.pdf: Full documentation of the software.
*
* \section sec_thanks Thanks!
*
* I'd like to thank <b>Michael Meier</b>, who developed and published a much
* more sophisticated clock on his site. The SAA1064-stuff and the routine to
* calculate the Unix timestamp are based on his project. You can find it under
* http://www.mulder.franken.de/ntpdcfledclock/.
*
* And once again I'd like to give special credits to <b>Thomas Stegemann</b>
* for help with the C language.
*
* \section sec_license About the license
*
* Our work - all contents except for the USB driver - are licensed under the
* GNU General Public License (GPL). A copy of the GPL is included in
* License.txt. The driver itself is licensed under a special license by
* Objective Development. See firmware/usbdrv/License.txt for further info.
*
* <b>(c) 2006 by Ronald Schaten - http://www.schatenseite.de</b>
*/

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EAGLE Version 4.16r1 Copyright (c) 1988-2006 CadSoft
Electrical Rule Check for /home/rschaten/microcontroller/binarydcf77clock/circuit/circuit.sch at 12/30/2006 10:30:30
WARNING: Sheet 1/1: POWER Pin IC2 VEE connected to GND
ERROR: 8 OUTPUT Pins on net B$1
ERROR: 8 OUTPUT Pins on net B$2
No board loaded - consistency has not been checked
2 errors
1 warnings

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Partlist
Exported from circuit.sch at 12/30/2006 10:40:23
EAGLE Version 4.16r1 Copyright (c) 1988-2006 CadSoft
Part Value Device Package Library Sheet
C1 100n C-EU025-024X044 C025-024X044 rcl 1
C2 100n C-EU025-024X044 C025-024X044 rcl 1
C3 470u CPOL-EUE5-8.5 E5-8,5 rcl 1
C4 100n C-EU025-024X044 C025-024X044 rcl 1
C5 2,7n C-EU025-024X044 C025-024X044 rcl 1
C6 100n C-EU025-024X044 C025-024X044 rcl 1
IC1 MEGA8-P MEGA8-P DIL28-3 avr 1
IC2 SAA1064 SAA1064 DIL24-6 micro-philips 1
IC3 MC7805CT 7805T TO220H linear 1
JP1 ISP JP5Q JP5Q jumper 1
JP2 DCF77 JP4E JP4 jumper 1
JP3 JP1E JP1 jumper 1
LED1 LED3MM LED3MM led 1
LED2 LED3MM LED3MM led 1
LED3 LED3MM LED3MM led 1
LED4 LED3MM LED3MM led 1
LED5 LED3MM LED3MM led 1
LED6 LED3MM LED3MM led 1
LED7 LED3MM LED3MM led 1
LED8 LED3MM LED3MM led 1
LED9 LED3MM LED3MM led 1
LED10 LED3MM LED3MM led 1
LED11 LED3MM LED3MM led 1
LED12 LED3MM LED3MM led 1
LED13 LED3MM LED3MM led 1
LED14 LED3MM LED3MM led 1
LED15 LED3MM LED3MM led 1
LED16 LED3MM LED3MM led 1
LED17 LED3MM LED3MM led 1
LED18 LED3MM LED3MM led 1
LED19 LED3MM LED3MM led 1
LED20 LED3MM LED3MM led 1
LED21 LED3MM LED3MM led 1
LED22 LED3MM LED3MM led 1
LED23 LED3MM LED3MM led 1
LED24 LED3MM LED3MM led 1
LED25 LED3MM LED3MM led 1
LED26 LED3MM LED3MM led 1
LED27 LED3MM LED3MM led 1
LED28 LED3MM LED3MM led 1
LED29 LED3MM LED3MM led 1
LED30 LED3MM LED3MM led 1
LED31 LED3MM LED3MM led 1
LED32 LED3MM LED3MM led 1
LED33 LED3MM LED3MM led 1
Q2 BC547 BC547 TO92 transistor-npn 1
Q3 BC547 BC547 TO92 transistor-npn 1
R1 10k R-EU_0207/10 0207/10 rcl 1
R3 1k R-EU_0207/10 0207/10 rcl 1
S1 31-XX B3F-31XX switch-omron 1

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# $Id: Makefile,v 1.1 2007/01/02 21:30:40 rschaten Exp $
# microcontroller settings
F_CPU = 1000000UL
MCU = atmega8
AVRDUDE = avrdude -p $(MCU) -P /dev/parport0 -c stk200 -E noreset,vcc
AVRDUDE = avrdude -p $(MCU) -P /dev/tts/USB0 -b 115200 -c avr109
COMPILE = avr-gcc -Wall -Os -I../common -I. -mmcu=$(MCU) -DF_CPU=$(F_CPU) #-DDEBUG_LEVEL=2
OBJECTS = saa1064.o dcftime.o main.o
# symbolic targets:
all: main.hex
.c.o:
$(COMPILE) -c $< -o $@
.S.o:
$(COMPILE) -x assembler-with-cpp -c $< -o $@
# "-x assembler-with-cpp" should not be necessary since this is the default
# file type for the .S (with capital S) extension. However, upper case
# characters are not always preserved on Windows. To ensure WinAVR
# compatibility define the file type manually.
.c.s:
$(COMPILE) -S $< -o $@
program: all
$(AVRDUDE) -U flash:w:main.hex
clean:
rm -f main.hex main.lst main.obj main.cof main.list main.map main.eep.hex main.bin *.o main.s
# 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
disasm: main.bin
avr-objdump -d main.bin
cpp:
$(COMPILE) -E main.c

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#ifndef BOOLE_H
#define BOOLE_H
/**
* \file boole.h
* \brief Simple boolean variables
* \author Thomas Stegemann
* \version $Id: boole.h,v 1.1 2007/01/02 21:30:40 rschaten Exp $
*
* License: See documentation.
*/
enum boolean_enum { False = 0, True = 1 };
typedef enum boolean_enum boolean;
static inline boolean boole(int test) {
if (test == 0) {
return False;
} else {
return True;
}
}
static inline const char *boolean_name(boolean value) {
if (value == False) {
return "false";
} else {
return "true";
}
}
#endif /* BOOLE_H */

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/**
* \file dcftime.c
* \brief Decoder for DCF-77 time signals
* \author Ronald Schaten & Thomas Stegemann
* \version $Id: dcftime.c,v 1.1 2007/01/02 21:30:40 rschaten Exp $
*
* License: See documentation.
*/
#include "boole.h"
#include "dcftime.h"
// TODO: define and use meaningful states for certain situations (valid time, no values received, etc.)
// TODO: find correct start of the seconds. ATM the clock is running late by one second
// TODO: check if it is possible to give DCF_RATE as parameter for init()
typedef unsigned int dcf_sample; /**< number of the current sample */
typedef unsigned int dcf_sizetype; /**< used for the size of a month */
const dcf_sample dcf_second_samples = (DCF_RATE); /**< number of samples per second */
/** dcf signal between 30ms and 130ms => dcf logic false (lower value) */
const dcf_sample dcf_logic_false_min = (DCF_RATE)*3/100;
/** dcf signal between 30ms and 130ms => dcf logic false (upper value) */
const dcf_sample dcf_logic_false_max = (DCF_RATE)*13/100;
/** dcf signal between 140ms and 230ms => dcf logic true (lower value) */
const dcf_sample dcf_logic_true_min = (DCF_RATE)*14/100;
/** dcf signal between 140ms and 230ms => dcf logic true (upper value) */
const dcf_sample dcf_logic_true_max = (DCF_RATE)*23/100;
/** duration between begin of dcf second (== begin of signal), should be 1 * second +/- 3% (lower value) */
const dcf_sample dcf_second_tolerance_min = (DCF_RATE) - (DCF_RATE)*3/100;
/** duration between begin of dcf second (== begin of signal), should be 1 * second +/- 3% (upper value) */
const dcf_sample dcf_second_tolerance_max = (DCF_RATE) + (DCF_RATE)*3/100;
/** definition of logical signal states */
enum dcf_logic_signal_enum {
dcf_signal_no, /**< no signal */
dcf_signal_false, /**< 'false' signal */
dcf_signal_true, /**< 'true' signal */
dcf_signal_invalid /**< invalid signal */
};
/** definition of logical signal states */
typedef enum dcf_logic_signal_enum dcf_logic_signal;
/** format of the received data, filled during reception */
struct dcf_receiving_data_struct {
dcf_date date; /**< date */
dcf_time time; /**< time */
boolean parity; /**< parity of the received data */
boolean is_valid; /**< data is valid */
dcf_logic_signal current_signal; /**< logical state of the received data */
dcf_sample low_samples; /**< counts low signal samples per second */
dcf_sample high_samples; /**< counts high signal samples per second */
};
/** definition of the received data, filled during reception */
typedef struct dcf_receiving_data_struct dcf_receiving_data;
/** format of the DCF data.
* dcf_current_datetime() and dcf_sample() may be called from different contexts. To avoid changing the current_datetime while it is read:
* if use_first_current_datetime is true: dcf_current_datetime reads current_datetime[0] and dcf_sample changes current_datetime[1]
* if use_first_current_datetime is false: vice versa
*/
struct dcf_data_struct {
dcf_datetime current_datetime[2]; /**< two full datasets */
boolean use_first_current_datetime; /**< flag if the first or the second dataset is used */
dcf_sample current_datetime_sample; /**< number of the current sample */
dcf_receiving_data receiving_data; /**< data being filled */
};
/*
global data
*/
static struct dcf_data_struct dcf_data; /**< full set of received dcf data */
/*
dcf_time
*/
/**
* Initialize a dcf_time value.
* \param pTime: pointer to a dcf_time variable
*/
static void dcf_time_init(dcf_time * pTime) {
pTime->second = 0;
pTime->minute = 0;
pTime->hour = 0;
pTime->is_dst = False;
}
/**
* Increment a time-value by one second.
* \param pTime: pointer to a dcf_time variable
* \return True if the date has to be incremented, too. Otherwise False.
*/
static boolean dcf_time_inc(dcf_time * pTime) {
++(pTime->second);
if (pTime->second == 60) {
pTime->second = 0;
++(pTime->minute);
if (pTime->minute == 60) {
pTime->minute = 0;
++(pTime->hour);
if (pTime->hour == 24) {
pTime->hour = 0;
return True; /* overflow => increment date */
}
}
}
return False;
}
/**
* Check if a time-value makes sense.
* \param pTime: pointer to a dcf_time variable
* \return True if the time is logically correct. Otherwise False.
*/
static boolean dcf_time_is_valid(dcf_time * pTime) {
return (pTime->second <= 60)
&& (pTime->minute <= 60)
&& (pTime->hour <= 24);
}
/*
dcf_date
*/
/**
* Initialize a dcf_date value.
* \param pDate: pointer to a dcf_date variable
*/
static void dcf_date_init(dcf_date * pDate) {
pDate->dayofweek = dcf_sunday;
pDate->dayofmonth = 1;
pDate->month = dcf_january;
pDate->year = 0;
}
/**
* Calculate the number of days in a month.
* \param pDate: pointer to a dcf_time variable
* \return The number of days in the given month.
*/
static dcf_sizetype dcf_date_days_in_month(dcf_date * pDate) {
switch (pDate->month) {
case dcf_february:
if (pDate->year % 4 != 0)
return 28; /* year not divisible by 4 */
else if (pDate->year != 0)
return 29; /* year divisible by 4 and not divisible by 100 */
else if (((pDate->dayofmonth % 7) + 1) != pDate->dayofweek)
return 28; /* year divisible by 100 and not divisible by 400 */
else
return 29; /* year divisible by 400 */
/*
if year is divisble by 400 (eg year 2000) the 1st february is a tuesday (== 2 (== 1+1))
if year divided by 400 remains 100 1st February is a monday
if year divided by 400 remains 200 1st February is a saturday
if year divided by 400 remains 300 1st February is a thursday
this repeats every 400 years, because 400 year are 3652425/25 day
which is 7*521775/25, therefore divisible by 7
which means every 400 years the day of week are the same
! dayofmonth and dayofweek must be synchronized to get the right value
*/
case dcf_april:
case dcf_june:
case dcf_september:
case dcf_november:
return 30;
default:
return 31;
}
}
/**
* Increment a date-value by one day.
* \param pDate: pointer to a dcf_date variable
*/
static void dcf_date_inc(dcf_date * pDate) {
++(pDate->dayofweek);
if (pDate->dayofweek == 8) {
pDate->dayofweek = 1;
}
++(pDate->dayofmonth);
if (pDate->dayofmonth == (dcf_date_days_in_month(pDate) + 1)) {
pDate->dayofmonth = 1;
++(pDate->month);
if (pDate->month == 13) {
pDate->month = 1;
++(pDate->year);
if (pDate->year == 100) {
pDate->year = 0;
}
}
}
}
/**
* Check if a date-value makes sense.
* \param pDate: pointer to a dcf_date variable
* \return True if the date is logically correct. Otherwise False.
*/
static boolean dcf_date_is_valid(dcf_date * pDate) {
return (1 <= pDate->dayofweek)
&& (pDate->dayofweek <= 7)
&& (1 <= pDate->dayofmonth)
&& (pDate->dayofmonth <= dcf_date_days_in_month(pDate))
&& (1 <= pDate->month)
&& (pDate->month <= 12)
&& (pDate->year <= 99);
}
/*
dcf_datetime
*/
/**
* Initialize a dcf_datetime value.
* \param pDatetime: pointer to a dcf_datetime variable
*/
static void dcf_datetime_init(dcf_datetime * pDatetime) {
pDatetime->is_valid = False;
pDatetime->has_signal = False;
dcf_time_init(&(pDatetime->time));
dcf_date_init(&(pDatetime->date));
}
/**
* Increment a datetime-value by one second.
* \param pDatetime: pointer to a dcf_datetime variable
*/
static void dcf_datetime_inc(dcf_datetime * pDatetime) {
if (dcf_time_inc(&(pDatetime->time))) {
dcf_date_inc(&(pDatetime->date));
}
}
/*
dcf_receiving_data
*/
/**
* Initialize a dcf_receiving_data value.
* \param pReceive: pointer to a dcf_receiving_data variable
*/
static void dcf_receiving_data_init(dcf_receiving_data * pReceive) {
pReceive->current_signal = dcf_signal_no;
pReceive->parity = False;
pReceive->is_valid = True;
pReceive->low_samples = 0;
pReceive->high_samples = 0;
dcf_time_init(&(pReceive->time));
dcf_date_init(&(pReceive->date));
}
/**
* Calculate the time and date while the bits are received.
* \param signal: True if the received bit is 200ms, False if the bit is 100ms.
*/
static void dcf_logic(boolean signal) {
dcf_data.receiving_data.parity ^= signal;
switch (dcf_data.receiving_data.time.second) {
case 16: dcf_data.receiving_data.parity = True; break;
case 17: dcf_data.receiving_data.time.is_dst = signal; break;
case 18: if(dcf_data.receiving_data.parity) dcf_data.receiving_data.is_valid = False; break;
case 19: dcf_data.receiving_data.parity = True; break;
case 20: if(!signal) dcf_data.receiving_data.is_valid = False; break;
case 21: dcf_data.receiving_data.time.minute = signal ? 1 : 0; break;
case 22: dcf_data.receiving_data.time.minute += signal ? 2 : 0; break;
case 23: dcf_data.receiving_data.time.minute += signal ? 4 : 0; break;
case 24: dcf_data.receiving_data.time.minute += signal ? 8 : 0; break;
case 25: dcf_data.receiving_data.time.minute += signal ? 10 : 0; break;
case 26: dcf_data.receiving_data.time.minute += signal ? 20 : 0; break;
case 27: dcf_data.receiving_data.time.minute += signal ? 40 : 0; break;
case 28: if(dcf_data.receiving_data.parity) dcf_data.receiving_data.is_valid = False; break;
case 29: dcf_data.receiving_data.time.hour = signal ? 1 : 0; break;
case 30: dcf_data.receiving_data.time.hour += signal ? 2 : 0; break;
case 31: dcf_data.receiving_data.time.hour += signal ? 4 : 0; break;
case 32: dcf_data.receiving_data.time.hour += signal ? 8 : 0; break;
case 33: dcf_data.receiving_data.time.hour += signal ? 10 : 0; break;
case 34: dcf_data.receiving_data.time.hour += signal ? 20 : 0; break;
case 35: if(dcf_data.receiving_data.parity) dcf_data.receiving_data.is_valid = False; break;
case 36: dcf_data.receiving_data.date.dayofmonth = signal ? 1 : 0; break;
case 37: dcf_data.receiving_data.date.dayofmonth += signal ? 2 : 0; break;
case 38: dcf_data.receiving_data.date.dayofmonth += signal ? 4 : 0; break;
case 39: dcf_data.receiving_data.date.dayofmonth += signal ? 8 : 0; break;
case 40: dcf_data.receiving_data.date.dayofmonth += signal ? 10 : 0; break;
case 41: dcf_data.receiving_data.date.dayofmonth += signal ? 20 : 0; break;
case 42: dcf_data.receiving_data.date.dayofweek = signal ? 1 : 0; break;
case 43: dcf_data.receiving_data.date.dayofweek += signal ? 2 : 0; break;
case 44: dcf_data.receiving_data.date.dayofweek += signal ? 4 : 0; break;
case 45: dcf_data.receiving_data.date.month = signal ? 1 : 0; break;
case 46: dcf_data.receiving_data.date.month += signal ? 2 : 0; break;
case 47: dcf_data.receiving_data.date.month += signal ? 4 : 0; break;
case 48: dcf_data.receiving_data.date.month += signal ? 8 : 0; break;
case 49: dcf_data.receiving_data.date.month += signal ? 10 : 0; break;
case 50: dcf_data.receiving_data.date.year = signal ? 1 : 0; break;
case 51: dcf_data.receiving_data.date.year += signal ? 2 : 0; break;
case 52: dcf_data.receiving_data.date.year += signal ? 4 : 0; break;
case 53: dcf_data.receiving_data.date.year += signal ? 8 : 0; break;
case 54: dcf_data.receiving_data.date.year += signal ? 10 : 0; break;
case 55: dcf_data.receiving_data.date.year += signal ? 20 : 0; break;
case 56: dcf_data.receiving_data.date.year += signal ? 40 : 0; break;
case 57: dcf_data.receiving_data.date.year += signal ? 80 : 0; break;
case 58: if(dcf_data.receiving_data.parity) dcf_data.receiving_data.is_valid = False; break;
}
++(dcf_data.receiving_data.time.second);
}
/**
* Copy the values from receiving_data to current_datetime.
*/
static void dcf_store(void) {
if ((dcf_data.receiving_data.is_valid)
&& dcf_time_is_valid(&(dcf_data.receiving_data.time))
&& dcf_date_is_valid(&(dcf_data.receiving_data.date))) {
dcf_data.current_datetime_sample = 0;
if (dcf_data.use_first_current_datetime) {
dcf_data.current_datetime[1].time = dcf_data.receiving_data.time;
dcf_data.current_datetime[1].date = dcf_data.receiving_data.date;
dcf_data.current_datetime[1].is_valid = True;
dcf_data.use_first_current_datetime = False;
} else {
dcf_data.current_datetime[0].time = dcf_data.receiving_data.time;
dcf_data.current_datetime[0].date = dcf_data.receiving_data.date;
dcf_data.current_datetime[0].is_valid = True;
dcf_data.use_first_current_datetime = True;
}
}
}
/**
* Copy valid time and increment it.
*/
static void dcf_inc(void) {
if (dcf_data.use_first_current_datetime) {
dcf_data.current_datetime[1] = dcf_data.current_datetime[0];
dcf_datetime_inc(&(dcf_data.current_datetime[1]));
dcf_data.use_first_current_datetime = False;
} else {
dcf_data.current_datetime[0] = dcf_data.current_datetime[1];
dcf_datetime_inc(&(dcf_data.current_datetime[0]));
dcf_data.use_first_current_datetime = True;
}
}
/*
exported functions, documented in header file
*/
void dcf_init(void) {
dcf_data.use_first_current_datetime = True;
dcf_data.current_datetime_sample = 0;
dcf_datetime_init(&(dcf_data.current_datetime[0]));
dcf_datetime_init(&(dcf_data.current_datetime[1]));
dcf_receiving_data_init(&(dcf_data.receiving_data));
}
void dcf_signal(boolean signal) {
if (dcf_data.receiving_data.low_samples > dcf_second_samples) {
if (dcf_data.receiving_data.time.second == 59) {
dcf_data.receiving_data.time.second = 0;
dcf_store();
} else {
dcf_data.receiving_data.time.second = 0;
}
dcf_data.receiving_data.low_samples = 0;
dcf_data.receiving_data.is_valid = True;
}
/* calculate receiving date time */
if (signal) {
dcf_data.receiving_data.low_samples = 0;
++(dcf_data.receiving_data.high_samples);
} else {
++(dcf_data.receiving_data.low_samples);
if (dcf_data.receiving_data.high_samples == 0) {
} else if (dcf_data.receiving_data.high_samples < dcf_logic_false_min) {
/* too short signal */
dcf_data.receiving_data.is_valid = False;
dcf_data.receiving_data.current_signal = dcf_signal_invalid;
} else if (dcf_data.receiving_data.high_samples < dcf_logic_false_max) {
/* short signal, logic 0 */
dcf_logic(False);
dcf_data.receiving_data.current_signal = dcf_signal_false;
} else if (dcf_data.receiving_data.high_samples < dcf_logic_true_min) {
/* signal cannot be assigned to true or false */
dcf_data.receiving_data.is_valid = False;
dcf_data.receiving_data.current_signal = dcf_signal_invalid;
} else if (dcf_data.receiving_data.high_samples < dcf_logic_true_max) {
/* long signal, logic 1 */
dcf_logic(True);
dcf_data.receiving_data.current_signal = dcf_signal_true;
} else {
/* too long signal */
dcf_data.receiving_data.is_valid = False;
dcf_data.receiving_data.current_signal = dcf_signal_invalid;
}
dcf_data.receiving_data.high_samples = 0;
}
/* calculate current date time */
++(dcf_data.current_datetime_sample);
if (dcf_data.current_datetime_sample == dcf_second_samples) {
dcf_data.current_datetime_sample = 0;
dcf_inc();
}
}
dcf_datetime dcf_current_datetime(void) {
if (dcf_data.use_first_current_datetime) {
dcf_data.current_datetime[0].has_signal = dcf_data.receiving_data.is_valid;
return dcf_data.current_datetime[0];
} else {
dcf_data.current_datetime[1].has_signal = dcf_data.receiving_data.is_valid;
return dcf_data.current_datetime[1];
}
}
const char *dcf_dayofweek_name(dcf_dayofweek dow) {
switch (dow) {
case 1:
return "Mo";
case 2:
return "Tu";
case 3:
return "We";
case 4:
return "Th";
case 5:
return "Fr";
case 6:
return "Sa";
case 7:
return "Su";
default:
return "??";
}
}
const char *dcf_is_dst_name(dcf_is_dst dst) {
if (dst) {
return "ST";
} else {
return "WT";
}
}

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#ifndef DCFTIME_H
#define DCFTIME_H
/**
* \file dcftime.h
* \brief Decoder for DCF-77 time signals
* \author Ronald Schaten & Thomas Stegemann
* \version $Id: dcftime.h,v 1.1 2007/01/02 21:30:40 rschaten Exp $
*
* License: See documentation.
*/
#include "boole.h"
/*
dcf-signal samples per second
*/
#ifndef DCF_RATE
#define DCF_RATE 244 /**< number of samples per second. dcf_signal() should be called this often */
#endif
#if (DCF_RATE < 100) || (250 < DCF_RATE)
#error DCF_RATE should be between 100 and 250
#endif
typedef unsigned int dcf_second; /**< seconds (0-59) */
typedef unsigned int dcf_minute; /**< minutes (0-59) */
typedef unsigned int dcf_hour; /**< hours (0-24) */
typedef unsigned int dcf_dayofmonth; /**< day of month (1-31) */
typedef unsigned int dcf_year; /**< year (0-99) */
typedef boolean dcf_is_dst; /**< daylight saving: True: MESZ, False: MEZ */
/** definition of weekdays */
enum dcf_dayofweek_enum {
dcf_monday = 1, /**< monday = 1 */
dcf_tuesday, /**< tuesday */
dcf_wednesday, /**< wednesday */
dcf_thursday, /**< thursday */
dcf_friday, /**< friday */
dcf_saturday, /**< saturday */
dcf_sunday, /**< sunday = 7 */
};
/** definition of weekdays */
typedef enum dcf_dayofweek_enum dcf_dayofweek;
/** definition of months */
enum dcf_month_enum {
dcf_january = 1, /**< january = 1 */
dcf_february, /**< february */
dcf_march, /**< march */
dcf_april, /**< april */
dcf_may, /**< may */
dcf_june, /**< june */
dcf_july, /**< july */
dcf_august, /**< august */
dcf_september, /**< september */
dcf_october, /**< october */
dcf_november, /**< november */
dcf_december /**< december = 12 */
};
/** definition of months */
typedef enum dcf_month_enum dcf_month;
/** format of the dcf_time */
struct dcf_time_struct {
dcf_second second; /**< seconds */
dcf_minute minute; /**< minutes */
dcf_hour hour; /**< hours */
dcf_is_dst is_dst; /**< daylight saving time */
};
/** definition of dcf_time */
typedef struct dcf_time_struct dcf_time;
/** format of the dcf_date */
struct dcf_date_struct {
dcf_dayofweek dayofweek; /**< day of week */
dcf_dayofmonth dayofmonth; /**< day of month */
dcf_month month; /**< month */
dcf_year year; /**< year */
};
/** definition of dcf_date */
typedef struct dcf_date_struct dcf_date;
/** format of the dcf_datetime */
struct dcf_datetime_struct {
dcf_time time; /**< the time */
dcf_date date; /**< the time */
boolean is_valid; /**< if is_valid is False: no complete signal received, do not use date and times */
boolean has_signal; /**< if has_signal is True: currently receiving signal */
};
/** definition of dcf_datetime */
typedef struct dcf_datetime_struct dcf_datetime;
/**
* Initialize the DCF-module. Call dcf_init before any other DCF function.
*/
void dcf_init(void);
/**
* Tell the DCF-module if the signal is high or low. This function decides if
* the received bit is a long or a short one, and if it is usable at all. It
* should be called regularly, the number of calls per second is defined in
* DCF_RATE.
* \param signal: True if the input signal is high, False if it is low.
*/
void dcf_signal(boolean signal);
/**
* Fetch the current date and time.
* \return The current date and time in a dcf_datetime structure
*/
dcf_datetime dcf_current_datetime(void);
/**
* Get the name of the current weekday.
* \param dow: Day of the current week. Monday = 1, tuesday = 2...
* \return Pointer to the name
*/
const char* dcf_dayofweek_name(dcf_dayofweek dow);
/**
* Get the name of the current daylight saving time (summertime, wintertime).
* \param dst: daylight saving time bit from the time signal
* \return Pointer to the name
*/
const char* dcf_is_dst_name(dcf_is_dst dst);
#endif

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/**
* \file main.c
* \brief Firmware for the binary DCF-77 clock
* \author Ronald Schaten
* \version $Id: main.c,v 1.1 2007/01/02 21:30:40 rschaten Exp $
*
* License: See documentation.
*/
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include "saa1064.h"
#include "dcftime.h"
uint8_t byte[4] = { 2, 3, 1, 0 }; /** the order of the connected output-LED-rows */
uint8_t output[4], outputOld[4]; /** current and old content of the LEDs */
/** the display-modes */
enum modes {
timeasbinary,
dateasbinary,
timeasbcdhorizontal,
dateasbcdhorizontal,
timeasbcdvertical,
dateasbcdvertical,
timestamp
};
enum modes mode;
uint8_t demomode = 0;
/**
* sends the current content of output[] to the LEDs if it has changed.
*/
void setLeds(void) {
uint8_t i;
for (i = 0; i < 4; i++) {
if (output[i] != outputOld[i]) {
set_led_digit(byte[i], output[i]);
outputOld[i] = output[i];
}
}
} // function setLeds
/**
* Takes the current time and converts it into different output-formats.
* \param datetime: the current time
*/
void setOutput(dcf_datetime datetime) {
uint8_t bcdlow, bcdhigh; /* takes the low and high parts when converting to BCD */
const uint32_t TS01012000 = 946681200UL; /* The UNIX-Timestamp of 1.1.2000 */
const uint16_t monthstarts[12] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 }; /* On which day does a new month start in non-leap-years */
const uint32_t SECONDSINADAY = (60UL * 60 * 24); /* Number of seconds in a day */
uint32_t ts; /* takes the UNIX-Timestamp */
switch (mode) {
case timeasbinary:
/* hour, minute and second are displayed in rows */
output[0] = datetime.time.hour;
output[1] = datetime.time.minute;
output[2] = datetime.time.second;
output[3] = 0;
break;
case dateasbinary:
/* day of month, month, year and day of week (starting with monday
* = 1) are displayed in rows */
output[0] = datetime.date.dayofmonth;
output[1] = datetime.date.month;
output[2] = datetime.date.year;
output[3] = datetime.date.dayofweek;
break;
case timeasbcdhorizontal:
/* the time is converted to BCD, the digits are displayed by two in
* a row */
bcdlow = datetime.time.hour % 10;
bcdhigh = datetime.time.hour / 10;
output[0] = (bcdhigh << 4) | bcdlow;
bcdlow = datetime.time.minute % 10;
bcdhigh = datetime.time.minute / 10;
output[1] = (bcdhigh << 4) | bcdlow;
bcdlow = datetime.time.second % 10;
bcdhigh = datetime.time.second / 10;
output[2] = (bcdhigh << 4) | bcdlow;
output[3] = 0;
break;
case dateasbcdhorizontal:
/* the date is converted to BCD, the digits are displayed by two in
* a row */
bcdlow = datetime.date.dayofmonth % 10;
bcdhigh = datetime.date.dayofmonth / 10;
output[0] = (bcdhigh << 4) | bcdlow;
bcdlow = datetime.date.month % 10;
bcdhigh = datetime.date.month / 10;
output[1] = (bcdhigh << 4) | bcdlow;
bcdlow = datetime.date.year % 10;
bcdhigh = datetime.date.year / 10;
output[2] = (bcdhigh << 4) | bcdlow;
bcdlow = datetime.date.dayofweek;
bcdhigh = 0;
output[3] = (bcdhigh << 4) | bcdlow;
break;
case timeasbcdvertical:
/* the time is converted to BCD, the digits are displayed in
* columns */
output[0] = 0;
output[1] = 0;
output[2] = 0;
output[3] = 0;
bcdlow = datetime.time.hour % 10;
bcdhigh = datetime.time.hour / 10;
output[0] |= ((bcdhigh & 8) << 4) | ((bcdlow & 8) << 3);
output[1] |= ((bcdhigh & 4) << 5) | ((bcdlow & 4) << 4);
output[2] |= ((bcdhigh & 2) << 6) | ((bcdlow & 2) << 5);
output[3] |= ((bcdhigh & 1) << 7) | ((bcdlow & 1) << 6);
bcdlow = datetime.time.minute % 10;
bcdhigh = datetime.time.minute / 10;
output[0] |= ((bcdhigh & 8) << 1) | ((bcdlow & 8) << 0);
output[1] |= ((bcdhigh & 4) << 2) | ((bcdlow & 4) << 1);
output[2] |= ((bcdhigh & 2) << 3) | ((bcdlow & 2) << 2);
output[3] |= ((bcdhigh & 1) << 4) | ((bcdlow & 1) << 3);
bcdlow = datetime.time.second % 10;
bcdhigh = datetime.time.second / 10;
output[0] |= ((bcdhigh & 8) >> 2) | ((bcdlow & 8) >> 3);
output[1] |= ((bcdhigh & 4) >> 1) | ((bcdlow & 4) >> 2);
output[2] |= ((bcdhigh & 2) << 0) | ((bcdlow & 2) >> 1);
output[3] |= ((bcdhigh & 1) << 1) | ((bcdlow & 1) << 0);
break;
case dateasbcdvertical:
/* the date is converted to BCD, the digits are displayed in
* columns */
output[0] = 0;
output[1] = 0;
output[2] = 0;
output[3] = 0;
bcdlow = datetime.date.dayofmonth % 10;
bcdhigh = datetime.date.dayofmonth / 10;
output[0] |= ((bcdhigh & 8) << 4) | ((bcdlow & 8) << 3);
output[1] |= ((bcdhigh & 4) << 5) | ((bcdlow & 4) << 4);
output[2] |= ((bcdhigh & 2) << 6) | ((bcdlow & 2) << 5);
output[3] |= ((bcdhigh & 1) << 7) | ((bcdlow & 1) << 6);
bcdlow = datetime.date.month % 10;
bcdhigh = datetime.date.month / 10;
output[0] |= ((bcdhigh & 8) << 1) | ((bcdlow & 8) << 0);
output[1] |= ((bcdhigh & 4) << 2) | ((bcdlow & 4) << 1);
output[2] |= ((bcdhigh & 2) << 3) | ((bcdlow & 2) << 2);
output[3] |= ((bcdhigh & 1) << 4) | ((bcdlow & 1) << 3);
bcdlow = datetime.date.year % 10;
bcdhigh = datetime.date.year / 10;
output[0] |= ((bcdhigh & 8) >> 2) | ((bcdlow & 8) >> 3);
output[1] |= ((bcdhigh & 4) >> 1) | ((bcdlow & 4) >> 2);
output[2] |= ((bcdhigh & 2) << 0) | ((bcdlow & 2) >> 1);
output[3] |= ((bcdhigh & 1) << 1) | ((bcdlow & 1) << 0);
break;
case timestamp:
/* compute the UNIX-Timestamp. This function is based on http://www.mulder.franken.de/ntpdcfledclock/ */
ts = TS01012000 + SECONDSINADAY; /* 2000 was leap year */
ts += SECONDSINADAY * datetime.date.year * 365;
/* Now account for the leap years. Yes, 2000 was a leap year too. */
ts += SECONDSINADAY * ((datetime.date.year - 1) / 4);
ts += SECONDSINADAY * monthstarts[datetime.date.month - 1];
if (((datetime.date.year % 4) == 0) && (datetime.date.month > 2)) {
/* We are in a leap year and past february */
ts += SECONDSINADAY;
}
ts += SECONDSINADAY * (datetime.date.dayofmonth - 1);
ts += 3600UL * datetime.time.hour;
ts += 60 * datetime.time.minute;
ts += datetime.time.second;
output[0] = (ts >> 24);
output[1] = (ts >> 16);
output[2] = (ts >> 8);
output[3] = (ts >> 0);
break;
default:
break;
}
} // function setOutput
/**
* Sets the output to a running light. This is used when no valid time can be
* displayed.
*/
void setWaiting(void) {
static uint8_t position = 0;
output[0] = 0;
output[1] = 0;
output[2] = 0;
output[3] = 0;
if (position < 8) {
output[0] = (1 << position);
} else if (position == 8) {
output[1] = 128;
} else if (position == 9) {
output[2] = 128;
} else if (position == 18) {
output[2] = 1;
} else if (position == 19) {
output[1] = 1;
} else {
output[3] = (128 >> (position - 10));
}
position++;
if (position > 19) {
position = 0;
}
} // function setWaiting
/**
* Timer interrupt function. This is called on every timer-interrupt (which
* happens 488 times per second.
*/
void timerInterrupt(void) {
dcf_datetime datetime; /** takes the current time and date */
static uint8_t tickcounter; /** internal tick, is incremented with every timer-loop */
static uint8_t keycounter = 0; /** used to defeat bouncing buttons */
static uint8_t demomodecounter = 0; /** used to switch to demo mode */
static uint8_t modeswitched = 0; /** set when the mode has been switched, displays bars to indicate the new mode. */
tickcounter++;
/* on every second interrupt, check the state of the DCF-signal */
if (tickcounter % 2) {
if ((PINC & (1 << PINC0))) {
// signal high
dcf_signal(True);
PORTC |= (1 << PINC1);
} else {
// signal low
dcf_signal(False);
PORTC &= ~(1 << PINC1);
}
}
/* on every 32nd interrupt, check if the key is pressed. After 5 loops with
* a pressed key, switch to the next display-mode. */
if (tickcounter % 32 == 0) {
if (!(PINC & (1 << PINC2))) {
// key pressed
keycounter++;
if (keycounter > 4) {
// after 4 cycles with pressed key, switch to the next mode
keycounter = 0;
mode++;
if (mode > timestamp) {
mode = timeasbinary;
}
modeswitched = 5;
}
demomodecounter++;
if (demomodecounter > 75) {
// after 75 cycles with pressed key, switch to or from demo mode
if (demomode == 0) {
demomode = 1;
mode = timeasbinary;
output[0] = 255;
output[1] = 255;
output[2] = 255;
output[3] = 255;
} else {
demomode = 0;
mode = timeasbinary;
output[0] = 255;
output[1] = 129;
output[2] = 129;
output[3] = 255;
}
setLeds();
demomodecounter = 0;
}
} else {
// key unpressed
keycounter = 0;
demomodecounter = 0;
}
}
/* on every 128th interrupt (about 4 times per second), check if anything
* new has to be displayed. */
if (tickcounter % 128 == 0) {
if (demomode == 1) {
// set the current date and time to a fixed value to demonstrate
// how the time is displayed
datetime.is_valid = 1;
datetime.time.hour = 10;
datetime.time.minute = 35;
datetime.time.second = 10;
datetime.date.dayofmonth = 30;
datetime.date.month = 12;
datetime.date.year = 6;
datetime.date.dayofweek = 6;
} else {
datetime = dcf_current_datetime();
}
if (modeswitched > 0) {
output[0] = mode + 1;
output[1] = mode + 1;
output[2] = mode + 1;
output[3] = mode + 1;
modeswitched--;
} else if (datetime.is_valid) {
setOutput(datetime);
} else {
setWaiting();
}
/* finally, set the output */
setLeds();
}
} // function timerInterrupt
/**
* Main-function. Initializes the hardware and starts the main loop of the
* application.
* \return An integer. Whatever... :-)
*/
int main(void) {
uint8_t i;
/* set a default display-mode */
mode = timeasbinary;
/* intialize ports */
DDRC = (1 << DDC1); // set pin 1 to output
PORTC = (1 << PC1) | (1 << PC2); // activate pullups on pins 1 and 2
/* initialize SAA1064 on i2c-bus */
led_init();
set_led_brightness(1);
for (i = 0; i <= 3; i++) { /* switch off all connected LEDs */
set_led_digit(i, 0);
}
/* initialize DCF77 */
dcf_init();
/* initialize timer */
TCCR0 = (0 << CS02) | (1 << CS01) | (0 << CS00); // set divider to 8.
/* The interrupt is called every 8*256 CPU-cycles, at 1MHz we get 488
* calls per second. DCF_RATE in dcftime.h has to be set according to
* this value. */
sei();
while (1) { /* main event loop */
if (TIFR & (1 << TOV0)) {
TIFR |= 1 << TOV0; /* clear pending flag */
timerInterrupt();
}
}
return 0;
}

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/**
* \file saa1064.c
* \brief I2C-connection to the SAA1064 LED-driver
* \author Ronald Schaten
* \version $Id: saa1064.c,v 1.1 2007/01/02 21:30:40 rschaten Exp $
*
* License: See documentation.
*/
/* based on http://www.mulder.franken.de/ntpdcfledclock/ */
#include <avr/io.h>
#include <util/delay.h>
#include "saa1064.h"
/* The Port used for the connection */
#define LEDPORT PORTC
#define LEDPIN PINC
#define LEDDDR DDRC
/* Which pins of the port */
#define SDAPIN PC4
#define SCLPIN PC5
/* the I2C addresses of the SAA 1064 LED drivers */
#define SAA_AD1 0x70 // or 0x76?
#define I2C_READ 0x01
#define I2C_WRITE 0x00
/* Should be at least 27 (80 / 3) at 8 MHz */
/* This was the conservative value used for testing. However, half as much should work as well. */
#define DELAYVAL 3
void led_init(void) {
/* activate pullups */
LEDPORT |= (1 << SCLPIN) | (1 << SDAPIN);
}
/* Send START, defined as high-to-low SDA with SCL high.
* Expects SCL and SDA to be high already!
* Returns with SDA and SCL low. */
static void I2C_start(void) {
/* Change to output mode. */
LEDDDR |= (1 << SDAPIN) | (1 << SCLPIN);
/* change SDA to low */
LEDPORT &= ~(1 << SDAPIN);
_delay_loop_1(DELAYVAL);
/* and SCL too */
LEDPORT &= ~(1 << SCLPIN);
_delay_loop_1(DELAYVAL);
}
/* Send STOP, defined as low-to-high SDA with SCL high.
* Expects SCL and SDA to be low already!
* Returns with SDA and SCL high. */
static void I2C_stop(void) {
/* Set SCL */
LEDPORT |= (1 << SCLPIN);
_delay_loop_1(DELAYVAL);
/* Set SDA */
LEDPORT |= (1 << SDAPIN);
_delay_loop_1(DELAYVAL);
/* Probably safer to tristate the bus */
LEDDDR &= ~((1 << SDAPIN) | (1 << SCLPIN));
}
/* Transmits the byte in what.
* Returns 1 if the byte was ACKed, 0 if not.
* Expects SCL and SDA to be low already!
* Returns with SDA and SCL low. */
static uint8_t I2C_transmit_byte(uint8_t what) {
uint8_t i;
for (i = 0; i < 8; i++) {
/* First put data on the bus */
if (what & 0x80) {
LEDPORT |= (1 << SDAPIN);
}
_delay_loop_1(DELAYVAL);
/* Then set SCL high */
LEDPORT |= (1 << SCLPIN);
_delay_loop_1(DELAYVAL);
/* Take SCL back */
LEDPORT &= ~(1 << SCLPIN);
_delay_loop_1(DELAYVAL);
/* And SDA too */
LEDPORT &= ~(1 << SDAPIN);
_delay_loop_1(DELAYVAL);
what <<= 1;
}
/* OK that was the data, now we read back the ACK */
/* We need to tristate SDA for that */
LEDPORT |= (1 << SDAPIN);
LEDDDR &= ~(1 << SDAPIN);
/* Give the device some time */
_delay_loop_1(DELAYVAL);
_delay_loop_1(DELAYVAL);
_delay_loop_1(DELAYVAL);
/* Then set SCL high */
LEDPORT |= (1 << SCLPIN);
_delay_loop_1(DELAYVAL);
_delay_loop_1(DELAYVAL);
_delay_loop_1(DELAYVAL);
i = LEDPIN & (1 << SDAPIN); /* Read ACK */
/* Take SCL back */
LEDPORT &= ~(1 << SCLPIN);
_delay_loop_1(DELAYVAL);
/* No more tristate, we pull SDA again */
LEDPORT &= ~(1 << SDAPIN);
LEDDDR |= (1 << SDAPIN);
_delay_loop_1(DELAYVAL);
return (i == 0);
}
void set_led_digit(uint8_t digit, uint8_t val) {
I2C_start();
/* Address device */
I2C_transmit_byte(SAA_AD1 | I2C_WRITE);
I2C_transmit_byte((digit & 3) + 1); /* Address Digit Register on device */
I2C_transmit_byte(val); /* Send value for Digit */
I2C_stop();
}
void set_led_brightness(uint8_t led_brightness) {
I2C_start();
I2C_transmit_byte(SAA_AD1 | I2C_WRITE); /* Address first driver */
I2C_transmit_byte(0); /* Address Config Register on device */
I2C_transmit_byte(((led_brightness & 0x07) << 4) | 0x07); /* Send Settings */
I2C_stop();
}

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#ifndef _SAA1064_H_
#define _SAA1064_H_
/**
* \file saa1064.h
* \brief I2C-connection to the SAA1064 LED-driver
* \author Ronald Schaten
* \version $Id: saa1064.h,v 1.1 2007/01/02 21:30:40 rschaten Exp $
*
* License: See documentation.
*/
/* based on http://www.mulder.franken.de/ntpdcfledclock/ */
/* This sets one digit on the LED module.
* digit is the number of the digit (0 - 7)
* val is a bitfield that contains the values to set. */
void set_led_digit(uint8_t digit, uint8_t val);
/* Configures the brightness of the LED module, or rather: the current the driver allows through them.
* The values 0 through 7 can be used, corresponding to 0 through 21 mA */
void set_led_brightness(uint8_t led_brightness);
/* Initialize the LED module... This basically enables the pullups on the I2C Bus pins */
void led_init(void);
#endif