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@xxxxxxxxx> 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@xxxxxx> > > > > > > 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 > >
