On Tue, 2022-04-12 at 16:59 +0100, Jonathan Cameron wrote: > On Tue, 12 Apr 2022 14:06:21 +0200 > Nuno Sá <noname.nuno@xxxxxxxxx> 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: > > > > > > ... > > > > > > > I took another look at the Analog Devices Inc. catalog and > > > > choose > > > > another > > > > couple of options: > > > > > > > > - ADPD188BI and ADPD410x: are optical devices based on > > > > SPI/I2C. > > > > I guess they > > > > might be too bold for a GSoC project. > > > > - MAX31875: is a Temperature Sensor based on I2C. Different > > > > than the optical > > > > devices, this one might be too simple. > > > > > > > - LTC2499: is a multiplexed ADC sensor. For now, it is my > > > > best > > > > option. > > > > > > Have you checked if it has similarities to 2496 and 2497 > > > variants? We > > > already have drivers for those, it makes sense to double check. > > > > > > > Yeah, after a quick look on the datasheet, they look very > > similar... > > > > 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. > > > > And this brings me to something that already crossed my mind... > > Jonathan, would it make sense to be able to change the trigger > > "sampling frequency" depending on some device configuration? In > > this > > case, if we want to have continous mode, I guess a hrtimer trigger > > would be, for example, one good candidate of a trigger to attach. > > And, as we can have different SPS, we would want to have the > > trigger > > fireing depending on that... This could also be an additional > > "task" > > for you (if it makes sense of course). > > In this case what defines the SPS? Yeah, it is something that you can set on the device so a writable sampling_frequency attr. I think it fits on your 3rd point. Anyways, it din't even crossed my mind that these rates are so low that buffering is is not worth it... > - Nuno Sá
