Hi:
U need to include the file that define *i2c_smbus_xxxx_xxxx()*
functions.
Maybe u can try add following codes
#include <linux/i2c-dev.h>
Terje Froysa於 2014年11月25日星期二UTC+8上午12時37分10秒寫道：
>
> Dear forum,
>
> I have now verified my I2C devices using Python.
> I need to re-code them in C.
>
> I find i2c driver dokumented here:
>
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/Documentation/i2c/dev-interface
>
> The documentation complies with my 3.8.13-bone67 compiled and installed
> kernel source (KERNEL/drivers/i2c/i2c-core.c)
>
> Problem:
> No file in /usr/include/* contains the prototypes for the documented
> *i2c_smbus_xxxx_xxxx()* functions.
>
> I can open/read/write to the /dev/i2c-x devices using standard read(),
> write() and ioctl(), but I find no higher level i2c functions.
>
> What is my problem?
>
> Please advice.
> Best regards
> Terje Froysa
>
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