Hi,
I'm using a BeagleBone RevA6 with the latest Angstrom (as of a few days
ago at least).
I'm able to get pwm pins up and running via the capemgr and the helpful
dts files for the various pwms in the /lib/firmware dir. I can echo various
duty and period values into the corresponding
/sys/devices/ocp.2/pwm_test_PX_YY.ZZ/{duty,period} files and control
servos. This all seems fine.
From my (possibly flawed) understanding, the better way to do this is to
explicitly export the pwms via the /sys/class/pwm/export special file. What
I don't understand is how are these pwms numbered from the export
perspective? That is, how do I know what number to cat into
/sys/class/pwm/export to correspond to, for example, P9_14 when configured
as ehrpwm1A?
I understand that for gpios there are 32 gpios per chip, so gpio 1[18]
= (1 * 32) + 18 = 50, and that seems to work. Is there some corresponding
relationship for pwms?
-P
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