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Op 29 mei 2008, om 01:12 heeft Tony Lindgren het volgende geschreven:
* Koen Kooi <k.kooi@xxxxxxxxxxxxxxxxxx> [080528 16:08]:
Op 23 mei 2008, om 12:49 heeft Peter 'p2' De Schrijver het volgende
geschreven:
Hi,
This patch adds a hwmon driver for the OMAP34xx internal temperature
sensor. I get unusually high values (80 degrees and more) from this
sensor though.
Same high values here as well:
root@beagleboard:/sys/class/hwmon/hwmon0/device# cat temp1_input
96
does anyone from TI have a hint if the chip is really that hot, or
that we need to scale the value?
Maybe it's in Fahrenheit?
That was my first thought, but looking that the omap3530 TRM
(spruf98.pdf) on page 836:
ADC code Temperature °C
From To
0 -40 -40
32 -0.7 0.8
64 44.9 46.3
96 89.3 90.6
And that maps to the adc_to_temp var at line 69 from http://source.mvista.com/git/gitweb.cgi?p=linux-omap-2.6.git;a=blob;f=drivers/hwmon/omap34xx_temp.c
Even if it didn't map, the raw ADC value is only ±6 °C off from the
real temperature around that point. So the adc value the kernel reads
gets translated correctly to °C, so if we think it's incorrect, the
kernel might be reading the ADC wrong.
regards,
Koen
Tony
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