Using a chronodot with the raspberry pi

[Ghi102]

I am trying to use the Chronodot RTC with the raspberry pi. I have followed a mix of this tutorial (see post by Penthux):

https://www.raspberrypi.org/forums/view ... 8&start=50

And this one:

https://learn.adafruit.com/adding-a-rea ... t-rtc-time

However, when I want to read the time or change the time of the RTC, I get this error:

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hwclock: ioctl(RTC_RD_TIME) to /dev/rtc0 to read the time failed: Invalid argument

The chronodot is recognized after doing this in super user mode (I was in the i2c-1 directory):

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sudo echo ds3231 0x68 > ./new_device

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i2cdetect -y 1

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     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 
10: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 
20: 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f 
30: 30 31 32 33 34 35 36 37 38 39 3a 3b 3c 3d 3e 3f 
40: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f 
50: 50 51 52 53 54 55 56 57 58 59 5a 5b 5c 5d 5e 5f 
60: 60 61 62 63 64 65 66 67 UU 69 6a 6b 6c 6d 6e 6f 
70: 70 71 72 73 74 75 76 77 

I have tried the following and it did not work:

viewtopic.php?f=41&t=73882
https://www.raspberrypi.org/forums/view ... 28&t=20619