Apalis TK1 - ubuntu i can't write in pwm polarity

Technical Support
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1

I’ve been tried write in ploarity file :

root@tegra-ubuntu:~# cd /sys/class/pwm/pwmchip0/
root@tegra-ubuntu:/sys/class/pwm/pwmchip0# echo 0 > export
root@tegra-ubuntu:/sys/class/pwm/pwmchip0# echo 1000000 > pwm0/period
root@tegra-ubuntu:/sys/class/pwm/pwmchip0# echo 500000 > pwm0/duty_cycle
root@tegra-ubuntu:/sys/class/pwm/pwmchip0# echo 1 > pwm0/enable
root@tegra-ubuntu:/sys/class/pwm/pwmchip0# echo "normal" > pwm0/polarity
-bash: echo: write error: Function not implemented

I disable pwm and the result is the same:

root@tegra-ubuntu:/sys/class/pwm/pwmchip0# echo 0 > pwm0/enable
root@tegra-ubuntu:/sys/class/pwm/pwmchip0# echo "normal" > pwm0/polarity
-bash: echo: write error: Function not implemented
root@tegra-ubuntu:/sys/class/pwm/pwmchip0# echo "inversed" > pwm0/polarity
-bash: echo: write error: Function not implemented

Can i do this in apalis tk1 ??

2

Could you provide the version of the hardware and software used?

3

apalis tk1 v1.1A

ixora v1.1A

ubuntu 14.04.6 LTS

4

Hi @hetan97

Changing of PMW’s Polarity is not supported on TK1. You will need to do this in User Space application.

Best regards,
Jaski