OH! sorry, I made a typo
that should be : ((raw_data_from_a10_tp_register-1447)/20) Celsius On Monday, June 16, 2014 11:18:02 PM UTC+8, Hans de Goede wrote: > > Hi, > > On 06/16/2014 03:03 PM, Tong Zhang wrote: > > Hi Siarhei, > > > > Thank you for your reply. > > > > I attached a ds18b20 thermal sensor on top of a10 to measure the > > temperature. > > > > And I drew a graph using following formula (temp_data-1447)*/20. It > seems > > Seems you lost something there, I'm quite interested in getting the actual > formula you used so that we can update the driver to do the right thing > on the A10 (it seems the current formula is correct for sun5i and sun7i, > but not > for sun4i / the A10). > > > that the two line correlate well on the right(minutes after attached) > > rather than the left(not long after attached). > > > > < > https://lh3.googleusercontent.com/-VX9j3c6EWnk/U57oUI6gB-I/AAAAAAAABxM/7FfvvskqmzQ/s1600/sensor.png> > > > > This seems quite good actually, as the rtp sensor code measures die > temperature, and > the ds18b20 is attached to the casing of the die it is logically for it to > lag behind. > > Regards, > > Hans > > > > > > > On Monday, June 16, 2014 4:51:02 PM UTC+8, Siarhei Siamashka wrote: > >> > >> On Sun, 15 Jun 2014 22:26:17 -0700 (PDT) > >> Tong Zhang <[email protected] <javascript:>> wrote: > >> > >>> Hello, > >>> > >>> I am having trouble with a10 temperature sensor. I have read a10 user > >>> manual[1] throughly and noticed conflict description about TP > registers. > >>> > >>> I also followed the routine[2]. The read is around 99C when cpu > governor > >> is > >>> performance and room temperature is 27C. I doubt whether the > temperature > >>> sensor is calibrated or am I interpreting the data > >>> correctly[(reg_read-1447)/10]. Or is it possible that the sensor is > >>> defective? > >>> > >>> Anyone has a10 can verify? > >> > >> The SoC (TP) temperature sensor was never properly calibrated. And yes, > >> it's pretty obvious in the case of the A10: > >> > >> http://irclog.whitequark.org/linux-sunxi/2014-04-04#7013946; > >> > >> We can't be sure about the temperature sensor in A20 either. It could > >> be also showing wrong temperature (but in a somewhat more believable > >> range). > >> > >> -- > >> Best regards, > >> Siarhei Siamashka > >> > > > -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
