DS 1307 RTC Simple Bash Client

[unique1984]

Connecting to DS 1307 RTC using i2cset, i2cget commands with shell scripting.

---

1. Pinout

DS 1307	Omega2+
GND	GND
VCC	5V
SDA	SDA
SCL	SCL
DS	N/C

1. Script

• Save this script under directory /root/bin as rtc "/root/bin/rtc"
• Other paths are ok but you should change line 101.
• Give exec the script chmod +x /root/bin/rtc

#!/usr/bin/env ash

#~ /*****************************************
#~ * Platform	: Omega2 / Omega2+
#~ * App		: DS 1307 RTC Simple Bash Client 
#~ * File		: rtc.sh
#~ * Date		: Tue Jun 12 11:27:40 EEST 2018
#~ * Version	: 1.0.0
#~ * Email		: info@yasinkarabulak.com
#~ * © Yasin KARABULAK
#~ * Licence 	: MIT License
#~ * 
#~ *******************************************/

SUFFIX="Rtc"

# device address 0x68
        # reg control   0x07
        # year          0x06
        # month         0x05
        # date          0x04
        # day           0x03
        # hour          0x02
        # minute        0x01
        # second        0x00

REGCONTROL=$(i2cget -y 0 0x68 0x07)
YEAR=$(i2cget -y 0 0x68 0x06)
MONTH=$(i2cget -y 0 0x68 0x05)
DATE=$(i2cget -y 0 0x68 0x04)
DAYOFWEEK=$(i2cget -y 0 0x68 0x03) # day of week 1-7 monday-sunday
HOUR=$(i2cget -y 0 0x68 0x02)
MINUTE=$(i2cget -y 0 0x68 0x01)
SECOND=$(i2cget -y 0 0x68 0x00)

function setRtc {
        i2cset -y 0 0x68 0x06 0x$(date +%y)
        i2cset -y 0 0x68 0x05 0x$(date +%m)
        i2cset -y 0 0x68 0x04 0x$(date +%d)
        i2cset -y 0 0x68 0x03 0x$(date +%u)
        i2cset -y 0 0x68 0x02 0x$(date +%H)
        i2cset -y 0 0x68 0x01 0x$(date +%M)
        i2cset -y 0 0x68 0x00 0x$(date +%S)
        sleep 1
        /root/bin/rtc
        exit
}

function yearRtc {
        printf "20%.2x" $YEAR
}

function monthRtc {
        printf "%.2x" $MONTH
}

function dayRtc {
        printf "%.2x" $DATE
}

function hourRtc {
        printf "%.2x" $HOUR
}

function minuteRtc {
        printf "%.2x" $MINUTE
}

function secondRtc {
        printf "%.2x" $SECOND
}

function dayofweekRtc {
        printf "%.2x" $DAYOFWEEK
}

function dateRtc {
        echo "$(yearRtc)$(monthRtc)$(dayRtc)$(hourRtc)$(minuteRtc)$(secondRtc)"
}

function helpRtc {
	echo -e "-------------------------------"
	echo -e "Commands [multi use permitted!]"
	echo -e "-------------------------------"
	echo -e "<set> Sets the RTC DS1307"
	echo -e "<year> Show the year from RTC"
	echo -e "<month> Show the month from RTC"
	echo -e "<day> Show the day from RTC"
	echo -e "<hour> Show the hour from RTC"
	echo -e "<minute> Show the minute from RTC"
	echo -e "<second> Show the second from RTC"
	echo -e "<dayofweek> Show which day of the week from RTC"
	echo -e "<date> Show the date [YYYYMMDDHHMMSS] from RTC"
	echo -e "<setSysDate> Set the system date from RTC"
	echo -e "<help> Show this help and exit"
}

function setSysDateRtc {
        date --set="$(yearRtc)-$(monthRtc)-$(dayRtc)" > /dev/null
        date --set="$(hourRtc):$(minuteRtc):$(secondRtc)" > /dev/null
        echo "RTC Date : " $(/root/bin/rtc)
        echo "SYS Date : " $(date +%Y-%m-%d" "%H:%M:%S)
}

if [ -z "$1" ]; then
        YEAR=$(yearRtc)
        MONTH=$(monthRtc)
        DATE=$(dayRtc)
        HOUR=$(hourRtc)
        MINUTE=$(minuteRtc)
        SECOND=$(secondRtc)
        DAYOFWEEK=$(dayofweekRtc)

    TARIH="$YEAR-$MONTH-$DATE $HOUR:$MINUTE:$SECOND"
    echo $TARIH
exit
fi

for arg in $@; do
        EXISTS=type "$arg$SUFFIX" &>/dev/null && eval "$arg$SUFFIX" || helpRtc
done

echo 

1. Using

root@Omega-C617:~# rtc help
-------------------------------
Commands [multi use permitted!]
-------------------------------
<set> Sets the RTC DS1307
<year> Show the year from RTC
<month> Show the month from RTC
<day> Show the day from RTC
<hour> Show the hour from RTC
<minute> Show the minute from RTC
<second> Show the second from RTC
<dayofweek> Show which day of the week from RTC
<date> Show the date [YYYYMMDDHHMMSS] from RTC
<setSysDate> Set the system date from RTC
<help> Show this help and exit

root@Omega-C617:~# /root/bin/rtc
2018-06-12 11:55:50
Show help: <rtc help>

root@Omega-C617:~# /root/bin/rtc year month day
20180612

root@Omega-C617:~# /root/bin/rtc day month year
12062018

root@Omega-C617:~# /root/bin/rtc hour minute second
115633

root@Omega-C617:~# /root/bin/rtc setSysDate
RTC Date :  2018-06-12 11:56:46 Show help: <rtc help>
SYS Date :  2018-06-12 11:56:46

Notes :

• rtc set command is sets the RTC Clock using system date,
• rtc setSysDate command is sets the system date using RTC date.

[Nagarjuna Reddy]

@unique1984 said in DS 1307 RTC Simple Bash Client:

echo -e "<date> Show the date [YYYYMMDDHHMMSS] from RTC"

sir,
can you help me it's not working for me?
I got the output is
i am using isl12026 datasheet
instead of your address value place i used 0x20 is this currect?

REGCONTROL=$(i2cget -y 0 0x20 0x07)
YEAR=$(i2cget -y 0 0x20 0x06)
MONTH=$(i2cget -y 0 0x20 0x05)
DATE=$(i2cget -y 0 0x20 0x04)
DAYOFWEEK=$(i2cget -y 0 0x20 0x03) # day of week 1-7 monday-sunday
HOUR=$(i2cget -y 0 0x20 0x02)
MINUTE=$(i2cget -y 0 0x20 0x01)
SECOND=$(i2cget -y 0 0x20 0x00)
i got the below output. can u please help me solve this problem.
2000-00-00 00:00:00