How to use SMBus to talk with RTC?

[jackbk]

I am a beginner for using SMBus to talk with RTC via I2C protocol. May I have a question?

My board has three i2c in /dev/ as below.
/dev/i2c-0 /dev/i2c-1 /dev/i2c-2

I do not know which i2c connect with my RTC (I am using ISL12057 RTC), so I try 3 times with following

Code: Select all

self._bus = smbus.SMBus(twi)
self._addr = 0x68

Value of twi=0,1, or 2

I get 2 kinds of error.

1.1 IOError: [Errno 16] Device or resource busy
1.2 IOError: [Errno 5] Input/output error

I do not understand what the error 1.1 and 1.2 are.

Could you give me a solution for solving the error? I really need it to start another task in my project.

[texy]

Hi,
which board are you using and how old is the OS ?

Texy

[DougieLawson]

What does i2cdetect -y 1 show?

[jackbk]

Hi,
which board are you using and how old is the OS ?

Texy

I am sorry for unclear information about my board. I am using VAR-DT6CustomBoard from Variscite. This board is connected to DART-MX6 board, and DART board is from Variscite also.

DT6 board
http://www.variscite.com/products/singl ... ustomboard

DART board
http://www.variscite.com/products/syste ... scale-imx6

About my OS, it is Yocto Jethro 4.1.15.

I know that my post may be not suitable in Raspberry Pi forum, but I am developing my system on Variscite's boards, not Raspberry's board. The main thing of my question is to talk with my RTC on Variscite's board by Python.

Yesterday, I visit Raspberry forum and I found a topic that we can talk with RTC on Raspberry board (DS1307) by Python; therefore, I think that I can apply this topic in my board. However, I met an issue when applying that.Therefore, I raised my issue in this topic.

Thank you for any help!

[jackbk]

What does i2cdetect -y 1 show?

I am sorry. I am using VAR-DT6 board from Variscite, so the command "i2cdetect -y 1" is not available in my board (my OS is Yocto Jethro 4.1.15).

My intention is just to talk with the RTC on my board by Python. So, do you have anymore recommendation for my issue?

Thank you in advance.

[texy]

What does i2cdetect -y 1 show?

I am sorry. I am using VAR-DT6 board from Variscite, so the command "i2cdetect -y 1" is not available in my board (my OS is Yocto Jethro 4.1.15).

My intention is just to talk with the RTC on my board by Python. So, do you have anymore recommendation for my issue?

Thank you in advance.

Hi,
these forums are for the support and community of Raspberry Pi products, paid for by the Raspberry Pi Foundation.
As such, asking for help on other products is not allowed. I'll move this thread to Off-Topic.
Thank you
Texy

[jackbk]

What does i2cdetect -y 1 show?

I am sorry. I am using VAR-DT6 board from Variscite, so the command "i2cdetect -y 1" is not available in my board (my OS is Yocto Jethro 4.1.15).

My intention is just to talk with the RTC on my board by Python. So, do you have anymore recommendation for my issue?

Thank you in advance.

Hi,
these forums are for the support and community of Raspberry Pi products, paid for by the Raspberry Pi Foundation.
As such, asking for help on other products is not allowed. I'll move this thread to Off-Topic.
Thank you
Texy

Sorry, I do not know that. It is OK to move this topic to Off-Topic.