Reading/Writing I2C devices in Raspbian?

[Bosse_B]

I need to read and write some I2C devices (RTC, EEPROM) on my RPi4.

I am not using C, C++ or Python so I would like to know if there are some Linux basic commands operating on the /dev/i2c-1 device I can use from any language that can handle files?
What I actually use is FreePascal and Lazarus IDE.

I have designed a board that will plug into the 40-pin connector and it has some relay drivers on board operated via GPIO pins, which I can work with already. But it also has some other devices hooked to the I2C bus, which I need to access.

Any suggestions appreciated, except for Python, which I can not use.
Thanks.
(I hope this is the right sub-forum to ask in)

[joan]

Linux communicates with the SMBus/I2C driver with standard read, write, and ioctl calls. You will need to use those.

[B.Goode]

I need to read and write some I2C devices (RTC, EEPROM) on my RPi4.

I am not using C, C++ or Python so I would like to know if there are some Linux basic commands operating on the /dev/i2c-1 device I can use from any language that can handle files?
What I actually use is FreePascal and Lazarus IDE.

I have designed a board that will plug into the 40-pin connector and it has some relay drivers on board operated via GPIO pins, which I can work with already. But it also has some other devices hooked to the I2C bus, which I need to access.

Any suggestions appreciated, except for Python, which I can not use.
Thanks.
(I hope this is the right sub-forum to ask in)

A few seconds with an Internet search tool and the string lazarus Raspberry i2c came up with -

Turns out, it is VERY easy to access I2C with Free Pascal.

Ref: https://bigdanzblog.wordpress.com/2014/ ... ee-pascal/

and
https://wiki.freepascal.org/Lazarus_on_Raspberry_Pi