RTC ds1307 is not connecting rockpi4c+

#1

i ma using Armbian 23.02.2 Bullseye with Linux 5.15.93-rockchip64. i connected the rtc ds1307, the ran
i2cdetect -y 1. That does not show the any connected module.
I checked in /boot/config-5.15.93-rockchip64, and there CONFIG_RTC_DRV_DS1307=y.
Am I missing something? why it is finding the rtc module?

#2

Probably you did not load the I²C overlay. Lookup the pinout of the board, check where you have connected your RTC (I²C 7 typically), enable it. In Armbian, run

$ sudo armbian-config

select System|Hardware, tick the I²C bus, reboot.

Note that the RTC driver will occupy the addresses of your RTC, i.e. i2cdetect will show UU.

#3

in this OS, the armbian-config config is not available. probably the reason is that it is a minimal version of os. how can I do that without armbian-config? or can I even install armbian-config ?

#4

I doubt there are Armbian images without armbian-config. Sure you did

sudo armbian-config ?

Otherwise I would suggest to install it:

sudo apt install armbian-config

If you really want to do it by hand, die Armbian documentation is your friend, for instance

https://docs.armbian.com/User-Guide_Allwinner_overlays/

#5

Hello everyone,
I’m trying also to connect the RTC ds1307 in RockPi4C+, but it isn’t detecting by I2C.

Informations:

  • RTC ds1307 used: https://www.seeedstudio.com/Pi-RTC-DS1307.html
  • Armbian OS version: 25.2
  • Kernel version: 6.12.10-current-rockchip64
  • i2c-7 enabled on armbian-config (> System > Kernel > SY210 > rockchip-rk3399-i2c7)
  • When I run the command: sudo i2cdetect -y 7 shows the error Error: Could not open file /dev/i2c-7' or /dev/i2c/7’: No such file or directory
  • When I run the command: sudo i2cdetect -l shows:
    i2c-0 i2c rk3x-i2c I2C adapter
    i2c-3 i2c rk3x-i2c I2C adapter

Is someone can help to solve this problem?

Thanks

#6

Does the image you are using have the relevant device tree blob (dtb) configured to enable the real-time clock (rtc)? The rock4c+ does not have the rtc function by itself. It is possible that the default Armbian image does not add support for device tree source (dts).

#7

I used Armbian_community_25.2.0-trunk.377_Rockpi-4cplus_bookworm_current_6.12.10_minimal.img from here: https://github.com/armbian/community/releases/tag/25.2.0-trunk.377

Do you have any suggestion?

Thanks.

#8

It already works!

In the file /boot/armbianEnv.txt, I had overlays=i2c1 i2c2 rockchip-rk3399-i2c7.
It was necessary to remove “rockchip” from rockchip-rk3399-i2c7, and then that line became: overlays=i2c1 i2c2 rk3399-i2c7

Thank you.

#9

You are excellent.