Configuring shunt_resistor in hwmon
james.feist at linux.intel.com
Tue Jan 7 08:37:05 AEDT 2020
On 1/6/20 1:29 PM, Alex Qiu wrote:
> Hi James,
> Thanks for your quick reply and reviewing my code in the morning!
> That looks interesting, so this ScaleFactor will be used to multiply the
> voltage value from hwmon without setting the shunt_resistor explicitly?
> I do have a little concern on the resolution, because it's only
> reporting 0.165V with default shunt_resistor setting, but we'll try and
> see if this will work for our case. In the meantime, do you know any
> other method that will work?
That's all I'm aware of in dbus-sensors. We have a voltage divider
in-front of our ADC channels, so we use this scale factor to calculate
the actual voltage. Anything else I think you'd need to add as a new
change if you're using dbus-sensors. I'm not sure if phosphor-hwmon
offers anything you could use or not.
> Thank you!
> - Alex Qiu
> On Mon, Jan 6, 2020 at 1:21 PM James Feist <james.feist at linux.intel.com
> <mailto:james.feist at linux.intel.com>> wrote:
> On 1/6/20 1:16 PM, Alex Qiu wrote:
> > Hi OpenBMC folks,
> > Is there a way to configure the shunt_resistor value for a hwmon
> > entity-manager or other modules?
> Have you seen this?
> For Entity-Manager + dbus-sensors.
> > We need to configure this value to make
> > the INA230 report correct voltage, but for now I don't find
> anything in
> > the code for it. Shall this be a feature to implement? Thanks!
> > - Alex Qiu
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