Aaaah - that's the pinmux order; had it wrong. Thanks. On Thursday, June 12, 2014 12:19:35 PM UTC-7, Charles Steinkuehler wrote: > > I believe Jason indicated the numbering was based on the order they are > listed in the device tree, so it should be consistent if you're not > changing overlays. > > On 6/12/2014 2:12 PM, maxmike wrote: > > 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:> > >> > > > > > -- > Charles Steinkuehler > [email protected] <javascript:> >
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