Hello Gearoid: * Gearoid Murphy <gearoid.murphy at ul.ie> [2005-06-09 19:54:36 +0100]: > Hi all, > This should be trivial for everyone here. I'm trying to write a user > space program i2c device driver. I access the device using /dev but when > I try to use functions included in the i2c-core my compiler tells me its The functions in i2c-core are for the use of in-kernel drivers (including kernel modules). Userspace cannot use them directly. > getting an undefined reference. I know this is because I'm not including > the proper libraries. How do i get around this?. I've tried explicitly > including the i2c-core.ko in the gcc compile command but this spews out > errors about other undefined references. Err... no way that could be expected to work. You can't just link an object or fragment of the kernel with a user program. > All I want to do is successfully communicate to an SRF08 sonar using > the i2c parallel port adapter for the ELV adapter (built using the > schema in the i2c docs). I'm using debian 2.6+ and am completely at my > wits end. Get the lm_sensors2 package. Install just the userspace part of it. That will give you, among other things, /usr/local/include/linux/i2c-dev.h. Use that in your user program (#include <linux/i2c-dev.h>). All the code in that header is inline, so you won't need to link anything else. The functions are similar to those in i2c-core. OR, if you're familiar with Python, I wrote a set of Python bindings for I2C/SMBus access. You can find them here: http://members.dca.net/mhoffman/sensors/python/20050122/ Copy those two files somewhere, then 'python ./setup.py --help-commands'. (I really should include a readme.txt) Feel free to ask more questions; good luck with your project. Regards, -- Mark M. Hoffman mhoffman at lightlink.com
