Quick update..
I successfully connected my Arduino UNO via the SMBus pins in the PCI slot today and used the Arduino Wire library to read temperatures from the motherboard's aSC7621. I checked the readings against speedfan and they matched.
It was only left running for a few minutes but I'm optimistic that it will work ok long term, the manual for the ICH10R states that the SMBus master is capable of multi mastering as is the Arduino.
If anyone needs to access their motherboard's SMBus then this might be a good solution. It seems that PCIe slots also have pins for SMBus (not sure if they are regularly connected?) and if you have a spare slot then then the riser card makes for an extremely simple non invasive connection.
Regards,
Robert.
On Thu, Jan 24, 2013 at 3:45 PM, Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
Still needs a multi-master capable controller, though. Many multi-master systemsOn Thu, Jan 24, 2013 at 11:10:16AM +0100, Jean Delvare wrote:
> On Thu, 24 Jan 2013 11:01:37 +0100, Robert Smith wrote:
> > Thanks,
> >
> > My motherboard is an Intel DX58SO. I have read the documentation and it
> > doesn't mention a header but it does mention that the SMBus is routed to
> > the (single) PCI slot.
>
> OK.
>
> > I understood that SMBus is a multi master bus? certainly my plans rely on
> > this.
> >
> > "SMBus is a two-wire multi-master bus, meaning that more than one device
> > capable of controlling the bus
> > can be connected to it."
> >
> > from section 2 'Characteristics' of:
> >
> > http://smbus.org/specs/smbus110.pdf
>
> Ah, my bad, I thought SMBus had stripped off the multimaster capability
> of I2C but clearly I'm wrong, sorry.
>
use bus master selectors such as PCA9541 to avoid the pitfalls of multi-master
access (such as one master blocking the bus). Actually, thinking about it, I
never encountered a multi-master system without similar protection.
Guenter
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