en:general_information:tutorial:pwm

This is an old revision of the document!

following Instuction only works for Linux kernel 3.11 or greater

PWM devices are listed under /sys/class/pwm

root@MBaXXX:~ cd /sys/class/pwm                                                   // enter pwm folder in sysfs
root@MBaXXX:/sys/class/pwm cd pwmchip<pwmchipnr>                                  // enter the desired pwmchip folder
root@MBaXXX:/sys/your/path/to/pwmchip/pwmchip<pwmchipnr> echo <pwmnr> > export    // export device PWM<pwmnr> 
root@MBaXXX:/sys/your/path/to/pwmchip/pwmchip<pwmchipnr> cd pwm<pwmnr>            // enter exported pwm device folder

example

root@MBaXXX:~ cd /sys/class/pwm                                                   
root@MBaXXX:/sys/class/pwm cd pwmchip3 
root@MBaXXX:/sys/class/pwmchip0 echo 0 > export
root@MBaXXX:/sys/class/pwnchip0 cd pwm0

Using PWM from sysfs

Where to find PWM devices in sysfs

enable PWM device