Can't use 2 PWMs

[jadonk]

From @daguej on July 27, 2013 7:23

If I try to use EHRPWM1A and EHRPWM1B:

b.pinMode('P9_14', b.OUTPUT);
b.pinMode('P9_16', b.OUTPUT);

b.analogWrite('P9_14', 0.5, 100);
b.analogWrite('P9_16', 0.5, 100);

...whichever is initialized second doesn't work. If I look in /sys/devices/ocp.2,

# ls pwm*
pwm_test_P9_14.14:
driver  duty  modalias  period  polarity  power  run  subsystem  uevent

pwm_test_P9_16.15:
modalias  power  subsystem  uevent

Copied from original issue: jadonk/bonescript#49

[jadonk]

I've confirmed that use of the PWM requires some specific period settings that the BoneScript library is violating. Here's the kernel log: [10262.983541] ehrpwm 48302200.ehrpwm: Period value conflicts with channel 0 [10262.990960] pwm_test pwm_test_P9_16.16: pwm_config() failed [10263.010070] pwm_test: probe of pwm_test_P9_16.16 failed with error -22 [10263.010171] bone-capemgr bone_capemgr.8: slot #10: Applied #2 overlays.

I believe that I'll need to autogenerate the .dts file to work around this limitation in the driver.

[jadonk]

From @daguej on August 20, 2013 3:16

Thanks for looking in to this

[jadonk]

Issue still exists in 0.2.4, but I know how to fix it.

[jadonk]

From @tovwiv on June 30, 2015 7:6

any update on this? ran into this exact issue today

[jadonk]

From @adityapatadia on June 30, 2015 7:7

May be you can try https://www.npmjs.com/package/octalbonescript

[jadonk]

From @NikolaMorena on September 29, 2015 11:41

Workaround: use pins that are not connected with same EHRPWM module, e.g. P9_14 and P8_13

[jrh21]

@jadonk was there any fix to this?