[MinnowBoard] I2C bus question

Anders, David david.anders at intel.com
Wed Jun 24 18:02:43 UTC 2015


Hay,

The two i2c busses are functionally the same, however the I2C interface on the Low Speed Expansion is at 3.3V levels, while the I2C on the High Speed Expansion is at 1.8V levels.

Dave


-----Original Message-----
From: elinux-MinnowBoard [mailto:elinux-minnowboard-bounces at lists.elinux.org] On Behalf Of Hay Nguonly
Sent: Wednesday, June 24, 2015 12:10 PM
To: MinnowBoard Development and Community Discussion
Subject: Re: [MinnowBoard] I2C bus question

Thank You for answering my question!

And, yes, that’s what's I meant ― access I2C bus from kernel driver rather than userspace.

Hay


On 6/24/15, 9:59 AM, "Darren Hart" <dvhart at linux.intel.com> wrote:

>
>On 6/18/15, 1:53 PM, "Hay Nguonly" <HNguonly at ixiacom.com> wrote:
>>Hi,
>>
>>I¹m look for some help on using I2C adapter in kernel mode.
>>I plan to access I2C bus in kernel mode and wanted to know the adapter 
>>number associated to the I2C signal on the Minnow Max board.
>
>What do you mean by "kernel mode" - as in through a device kernel 
>driver rather than userspace IOCTL calls?
>
>>
>>There are two I2C buses:
>>
>>I2C (#5)   pin #13 and #15 (Low Speed Expansion ­ top)
>>I2C (#6)   pin #21 and #23 (High Speed Expansion - bottom)
>>
>>Which one should I be using?
>>Is there a reason for using one vs the other?
>
>The buses are equivalent for all intents and purposes. Use the one on 
>the port that fits your application best. If you don't require any of 
>the high speed signals, the low speed expansion port is more accessible 
>and easier to prototype with.
>
>--
>Darren Hart
>Intel Open Source Technology Center
>
>
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>elinux-MinnowBoard at lists.elinux.org
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