SATA hat fan connector

[kirkdis]

Hi,

I connected a 12 fan to the dedicated fan output and it is not spinning. Is there any jumper to set to get the fan working?

thanks

[peguerosdc]

According to RK3399 Wiki / PWM you need to enable the PWM pin (as root):

Export PWM0 to users

echo 0 > /sys/class/pwm/pwmchip1/export

Control a PWM fan's speed by setting the PWM's period and duty_cycle.

echo 0 > /sys/class/pwm/pwmchip1/pwm0/enable
echo 50000 > /sys/class/pwm/pwmchip1/pwm0/period
echo 1 > /sys/class/pwm/pwmchip1/pwm0/enable
echo 45000 > /sys/class/pwm/pwmchip1/pwm0/duty_cycle

I am running Armbian on my M4 and it works perfectly.