I have done almost everything from numerous tutorials to get the RTC to work, but when I run sudo hwclock -r, i still get the following error.
hwclock: Cannot access the Hardware Clock via any known method. hwclock: Use the --debug option to see the details of our search for an access method.
My sudo i2cdetect -y 1 is detecting the RTC DS3231 as below:
pi@raspberrypi:~ $ sudo i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- 57 -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
EDIT: What I have done till now
Connected the RTC to the RasPi 3. Enabled i2c in sudo raspi-config
My /etc/modules is now
snd-bcm2835
i2c-bcm2835
i2c-bcm2708
i2c-dev
rtc-ds1307
Added the following lines to /boot/config.txt
# Support for rtc ds3231
dtoverlay=i2c-rtc,ds3231
dtoverlay=i2c-rtc,ds1307
dtparam=i2c_arm=on
dtparam=i2c1=on
device_tree=
My /etc/rc.local has the following lines
echo ds3231 0x68 > /sys/class/i2c-adapter/i2c-1/new_device
hwclock -s
But i do get an INVALID ARGUMENT ERROR when i run sudo echo ds3231 0x68 > /sys/class/i2c-adapter/i2c-1/new_device.
At the end, sudo hwclock or hwclock gives the error : hwclock: Cannot access the Hardware Clock via any known method. hwclock: Use the --debug option to see the details of our search for an access method.
Can somebody suggest me on a fix for this.
EDIT:
Tried the fix suggested on a fresh install of NOOBS v1.9.2 after sudo apt-get update and sudo apt-get dist-upgrade
Same issue remain.
ADDED on 03.Oct.2016
As per inputs from joan and Milliways,
I have added dtoverlay=i2c-rtc,ds3231 only, and got the hwclock to give date and time, bu the problem is that hwclock runs like internal clock now, it doesn't keep time across reboots.
Any inputs?
