Thank you - unfortunately the boot order of the pwm indexes as applied to pins is random (i.e. pin P8_13 is 6 one day and something else another.)
On Thursday, June 5, 2014 1:23:50 PM UTC-7, Charles Steinkuehler wrote: > > On 6/5/2014 12:11 PM, Charles Steinkuehler wrote: > > On 6/5/2014 11:52 AM, maxmike wrote: > >> > >> > >> No need to modify cape-universal. Since I'm on the clock what I'll do > is > >> remove the pwm pins I need from > >> cape-universal .dts and recompile; then load the perfectly good, > existing > >> /lib/firmware entries for pwm. > > > > That will work, of course, but the whole reason I went through this > > exercise was to make it unnecessary for folks to fiddle with editing > > overlay files. > > OK, I got a chance to review this, and as I thought you just need to > export the PWM channels so you can play with them via sysfs. Some > details are available on the TI wiki: > > http://processors.wiki.ti.com/index.php/Linux_Core_PWM_User%27s_Guide > > Executive summary...as root: > > for PWM in 0 1 2 3 4 5 6 7 ; do > echo $PWM > /sys/class/pwm/export > done > > ...and you'll have your period and duty files: > > find /sys/devices/ocp.*/ -name '*_ns' > /sys/devices/ocp.3/48302000.epwmss/48302200.ehrpwm/pwm/pwm3/duty_ns > /sys/devices/ocp.3/48302000.epwmss/48302200.ehrpwm/pwm/pwm3/period_ns > /sys/devices/ocp.3/48302000.epwmss/48302200.ehrpwm/pwm/pwm4/duty_ns > /sys/devices/ocp.3/48302000.epwmss/48302200.ehrpwm/pwm/pwm4/period_ns > /sys/devices/ocp.3/48304000.epwmss/48304100.ecap/pwm/pwm7/duty_ns > /sys/devices/ocp.3/48304000.epwmss/48304100.ecap/pwm/pwm7/period_ns > /sys/devices/ocp.3/48304000.epwmss/48304200.ehrpwm/pwm/pwm5/duty_ns > /sys/devices/ocp.3/48304000.epwmss/48304200.ehrpwm/pwm/pwm5/period_ns > /sys/devices/ocp.3/48304000.epwmss/48304200.ehrpwm/pwm/pwm6/duty_ns > /sys/devices/ocp.3/48304000.epwmss/48304200.ehrpwm/pwm/pwm6/period_ns > /sys/devices/ocp.3/48300000.epwmss/48300200.ehrpwm/pwm/pwm0/duty_ns > /sys/devices/ocp.3/48300000.epwmss/48300200.ehrpwm/pwm/pwm0/period_ns > /sys/devices/ocp.3/48300000.epwmss/48300200.ehrpwm/pwm/pwm1/duty_ns > /sys/devices/ocp.3/48300000.epwmss/48300200.ehrpwm/pwm/pwm1/period_ns > /sys/devices/ocp.3/48300000.epwmss/48300100.ecap/pwm/pwm2/duty_ns > /sys/devices/ocp.3/48300000.epwmss/48300100.ecap/pwm/pwm2/period_ns > > -- > Charles Steinkuehler > [email protected] <javascript:> > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
