[meta-freescale] how to access i2c bus on imx6q sabrelite

[Philip Craig]

On Wed, Jul 24, 2013 at 8:44 PM, Thanassis Silis <djnass_18 at hotmail.com> wrote:
> Hi there!
> well, I am attempting to open /dev/i2c-2 directly from my application.
>
> I do get a file descriptor (i2c_fd!=-1) , but then sending the same data as
> I do from, i2cset does not yield the same result..

What is your code for sending data? There's nothing special about
i2cset. If your code is the same then it will work. There is some
documentation on using the i2c device at
https://www.kernel.org/doc/Documentation/i2c/dev-interface.

>> Date: Wed, 24 Jul 2013 09:46:14 +1000
>> Subject: Re: [meta-freescale] how to access i2c bus on imx6q sabrelite
>> From: phil at blackmoth.com.au
>> To: djnass_18 at hotmail.com
>> CC: meta-freescale at yoctoproject.org
>
>>
>> On Wed, Jul 24, 2013 at 2:30 AM, Thanassis Silis <djnass_18 at hotmail.com>
>> wrote:
>> > if, however, i try:
>> >
>> > i2cset 2 0x5A 0x1A 1
>> >
>> > it works! The "2" was a reasonable choice resembling i2c-2, but looking
>> > into
>> > i2cset.c (& i2cbusses.c),
>> > it seems that the code is looking into /dev/i2c/X, where X= the number
>> > given
>> > in the argument).
>> > But I have no "folder" /dev/i2c/.
>>
>> The code first tries /dev/i2c/2, and when that fails it tries
>> /dev/i2c-2. You can confirm this using strace.
>>
>> > This is puzzling. What is more, I don't know how to access the i2c-2 bus
>> > from my application, as
>>
>> Your application can do the same as i2cset.