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I am supposed to write a simple write and read program for i2c but the problem is that I don't have the device at hand presently to test it so I need my code to be perfect.

I am confused about the function of the I2C_SLAVE ioctl. From what I read,this ioctl is used to set the slave address.

But we pass the slave address again when performing read/write using ioctl I2C_RDWR via Addr in the structure i2c_msg. In the linux documentation it is mentioned the address set using I2C_RDWR has precedence over address set by I2C_SLAVE.

So then,what is the function of I2C_SLAVE command? Is it required?

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You should consider adding more information about what you tried yourself –  Ivo Flipse Mar 26 '12 at 13:24

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I2C_SLAVE will change the slave address, so probably you need to use this command before writing to a specific address or read from specific address.

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