Fan Control - Apalis TK1, Ixora C

Technical Support
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1

Dear all,

I am having trouble enabling the fan on my board via GPIO. I have read the other topic on fan control, but it did not help me. In the documentation it says that components R35 should be assembled on the Ixora. I checked that this is the case. GPIO_8 should control the board. On the Ixora GPIO8 corresponds to MXM17. On the Apalis TK1 MXM17 correspond to GPIO8 so this should be compatible.

Here is my procedure:

root@tegra-ubuntu:/home/ubuntu# echo 8 > /sys/class/gpio/export
root@tegra-ubuntu:/home/ubuntu# echo out > /sys/class/gpio/gpio8/direction
root@tegra-ubuntu:/home/ubuntu# echo 1 > /sys/class/gpio/gpio8/value
root@tegra-ubuntu:/home/ubuntu# cat /sys/class/gpio/gpio8/value
1
root@tegra-ubuntu:/home/ubuntu# cat /sys/class/gpio/gpio8/direction
out

The fan does not turn on. When I use a multimeter the voltage on the Fan connector is 0V, where I would expect 12V.

2

I finally found the solution. From the Apalis TK1 manual:

17 GPIO8 PEX_L0_CLKREQ_N GPIO3_PDD.02 I/O

GPIO3_PDD.02 translated to gpio234.