smith wrote: > >>> Additional changes from Gen 1 include the ability to both measure > >>> DC input current and VIN voltage, as well as EC control over the > >>> current drawn from the DC input. The intent was to better support > >>> charging directly from solar panels. > >> I hope that this will be available to activities like Measure. > > > > Interesting point. That would require extending the EC API, as they > > go to an A/D > > not directly addressable by the main processor. > > > >> Ideally updates could be frequent enough to pick up a waveform > >> from an unrectified power supply. (spare audio channel?) > > Don't have much in the way of EC cycles available. Don't have much EC > ram left to cache values either. > > I can make the readings available via EC commands but each command takes > a few ms to complete and back to back commands will have a few ms of > delay as well. I'm guessing you might be able to get a 20ms update rate. > > The best method would be to leave indexed IO enable and tell the EC to > quit reading from the ports. Then you could use indexed IO to read the > AD registers directly. I'm not sure what update speed you can get that > way but it should be pretty fast.
i would think Measure would be more interested in (short-term) averages of voltage and current than in seeing power supply noise. (will an XO even run properly from an unrectified, or even unfiltered, supply?) paul =--------------------- paul fox, p...@laptop.org _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel