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USING RTC PCF8563 on RASPBERRY PI 3
Posted: Wed Feb 22, 2017 10:17 am
by ikram
i used a PCF8563 RTC with Raspberry pi 3 ,ranning 2016-09-23-raspbian-jessie
i did this steps:
sudo vi /etc/modules
add the following lines at the end of the file :
i2c-bcm2708
i2c-dev
rtc-pcf8563
install i2c-tools:sudo apt-get install i2c-tools
after reboot : sudo i2cdetect -y 1
Code: Select all
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- UU -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
is this means that my Pi didn't detect the RTC?
how can i solve this problems?
Re: USING RTC PCF8563 on RASPBERRY PI 3
Posted: Wed Feb 22, 2017 9:35 pm
by DougieLawson
That's not the way it's done with Jessie and the device tree enabled kernel.
Undo all that stuff in /etc/modules you don't need any of that.
Add
to /boot/config.txt and reboot.
Re: USING RTC PCF8563 on RASPBERRY PI 3
Posted: Wed Feb 22, 2017 10:52 pm
by gregeric
Dougie's advice is enough to get the RTC working ie readable & writable by the kernel.
But that's not the end of it. There are further steps to disable Raspbian's fakehwclock & have linux store the network time on the hwclock at poweroff.
Re: USING RTC PCF8563 on RASPBERRY PI 3
Posted: Thu Feb 23, 2017 7:44 am
by ikram
thank you for your help i tried what you sayed the RTC works verry well but it still show me 'UU' where 0x51 should be
and also when i shut down the raspberry the date change to another date
Re: USING RTC PCF8563 on RASPBERRY PI 3
Posted: Thu Feb 23, 2017 1:24 pm
by alphanumeric
Like gregeric said, there are a few other steps to get it fully working. Have a look at this and see if it helps,
https://learn.adafruit.com/adding-a-rea ... t-rtc-time I have a DS1307 and DS3231 from Adfuit and they both work fine after following that tutorial.
Re: USING RTC PCF8563 on RASPBERRY PI 3
Posted: Thu Feb 23, 2017 1:51 pm
by texy
UU means that address is reserved by a driver - so although the device tree method is now current and the preferred approach, the older method by manually loading the drivers via /etc/modules was still probably working OK.....
Texy
Re: USING RTC PCF8563 on RASPBERRY PI 3
Posted: Thu Feb 23, 2017 2:48 pm
by ikram
thank you for your help
i tried the steps and it works
PS: in the RTC pcf8563 there is a jumper (vcc batterie) we shoud change it to the buttry to save the time when the raspberry is off
Re: USING RTC PCF8563 on RASPBERRY PI 3
Posted: Thu Feb 23, 2017 9:12 pm
by DougieLawson
texy wrote:UU means that address is reserved by a driver - so although the device tree method is now current and the preferred approach, the older method by manually loading the drivers via /etc/modules was still probably working OK.....
Texy
Except that RTCs normally show up at 0x68. (Note:I've not checked the datasheet for this one.)
Re: USING RTC PCF8563 on RASPBERRY PI 3
Posted: Thu Feb 23, 2017 10:28 pm
by gregeric
DougieLawson wrote:texy wrote:UU means that address is reserved by a driver - so although the device tree method is now current and the preferred approach, the older method by manually loading the drivers via /etc/modules was still probably working OK.....
Texy
Except that RTCs normally show up at 0x68. (Note:I've not checked the datasheet for this one.)
That particular RTC PCF8563 has I2C address 0x51, so texy was bang on with his observation.