Re: GSoC Proposal 2022

["Nuno Sá" <noname.nuno@gmail.com>]

On Tue, 2022-04-12 at 16:24 -0300, Maíra Canal wrote:
> On 04/12, Jonathan Cameron wrote:
> > On Tue, 12 Apr 2022 16:23:55 +0200
> > Nuno Sá <noname.nuno@gmail.com> wrote:
> > 
> > > On Tue, 2022-04-12 at 09:24 -0300, Maíra Canal wrote:
> > > > On 04/12, Nuno Sá wrote:  
> > > > > On Tue, 2022-04-12 at 11:48 +0300, Andy Shevchenko wrote:  
> > > > > > On Tue, Apr 12, 2022 at 10:43 AM Maíra Canal
> > > > > > <maira.canal@usp.br>
> > > > > > wrote:  
> > > > > > > On 04/11, Jonathan Cameron wrote:  
> > > > > 
> > > > > The MAX31875 looks to be a fairly simple one (maybe a good
> > > > > candidate
> > > > > for a first driver) but, IMO, having it in IIO boils down to
> > > > > have
> > > > > support for continuos mode which would mean triggered buffer
> > > > > support.  
> > > > 
> > > > I took another look at the Maxim Integrated catalog and end up
> > > > finding
> > > > the MAX31889 Temperature Sensor.
> > > > 
> > > > I guess this sensor has an interesting challenge level with the
> > > > need
> > > > to
> > > > implement FIFO and interrupts support. 
> > > > 
> > > > Have you guys some thoughts on this one?
> > Hmm. The fifo is interesting, but I'm somewhat doubtful that it's
> > actually
> > much use when connected to a linux system.  The sampling rate is
> > 1Hz.
> > At that rate even in busy systems or low power situations, there is
> > little reason not to just poll the device.
> > 
> > You 'could' wire up a PWM or similar to the gpio and have it
> > operate
> > like a 'self clocked' device but with sampling rates so low it's a
> > fairly
> > contrived situation.
> > 
> > Temperature sensors in general are often a bad fit for IIO
> > precisely because
> > they are mostly designed for monitoring type purposes which HWMON
> > covers.
> > The exceptions are high speed or high accuracy devices or weird
> > ones like
> > infrared thermometers.
> 
> Okay, so temperature sensors are not a good choice for an IIO
> project.
> 
> Just another two suggestions: AD5124/AD5144/AD5144A potenciometer and
> AD7294-2
> ADC. Any of those are a good idea for IIO?
> 

Both options look promising being AD7294-2, at first glance, more
complex. The latter actually looks like it fits iio/addac category of
devices. I just briefly looked at the datasheets so I cannot really say
for sure if buffering makese sense for these (for adc/dac often it
does).

- Nuno Sá
> >