Christian Ege wrote:
> Am 05.11.2014 12:44 schrieb <[email protected]>:
>> Does anyone have a clue how the A20's CHOP_TEMP_EN register (according to
>> the A20's
>> user manual: "Chop temperature calibration enable: 0: Disable, 1: Enable")
>> can be read/set?
>
> For read write access from user space you can try to use devmem2 with the
> address given
> in the user manual.
>
> http://manpages.ubuntu.com/manpages/natty/man1/devmem2.1.html
Thx, will give it a try this evening. In the meantime I realized that it's bit
7 of the touchpanel's TP_CTRL1 register so when sunxi-dbgreg.ko is loaded I
should succeed with
echo 'f1c25004' > /sys/devices/virtual/misc/sunxi-dbgreg/rw/read;
Corentin's code in this module as well as the sunxi-dbgreg-workaround I use set
bit 4 to 1 but leave bit 7 untouched. With CHOP_TEMP_EN enabled I get a
whopping 25°C lower reported by the TP controller inside the A20 with an
attached heatsink compared to the very same A20 without a heatsink a few
minutes before. I'll report back what can be read when CHOP_TEMP_EN is disabled.
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