Hi, I am having trouble with BBB and using PWM. I am using Arch Linux and the following kernel "4.7.0-1-ARCH #1 Wed Jul 27 19:22:21 MDT 2016 armv7l GNU/Linux".
When I try to enable PWM (echo "am33xx_pwm" > /sys/devices/platform/bone_capemgr/slots) I get the following error in kernel log: [ 72.786264] ehrpwm 48300200.pwm: Failed to get tbclk [ 72.791291] ehrpwm: probe of 48300200.pwm failed with error -2 Any idea what is wrong? Also, configuration of the PWM is very confusing. Can someone please explain how to configure PWM? For example I would like to use P9_16 as a PWM pin. What are the steps necessary to configure and use this pin as PWM? I assume I have to also use this overlay [1] but it seems to binds it to a "pwm_test" driver which does not exist in my kernel tree. However, even without this driver it seems like just inserting the "am33xx_pwm" overlay gives me option to "export" the pwm0 device: "echo 0 > /sys/class/pwm/pwmchip0/export". This gives me a folder "/sys/class/pwm/pwmchip0/pwm0/" that has nodes for duty_cycle, period, polarity, and enable..... [1] " https://github.com/beagleboard/devicetree-source/blob/master/arch/arm/boot/dts/bone_pwm_P9_16-00A0.dts " Thanks! -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/98d065d0-7646-4b7c-bd9a-48029b100bb8%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
