Thanks Jason, There is a hardware solution to my problem in a form of a tiny logic 08 (AND gate). The PWM is connected to one input and an extra ENABLE signal from GPIO is connected to another input. On the output the resulting gated PWM signal will appear when the ENABLE signal goes high from the application. The solution however is non-elegant and can be avoided if I had a better knowledge of the software - in this case a PWM driver and it's interaction with a device tree overlay.
The inverter is not a solution as on boot initial pin value is low and after the device tree is loaded it jumps high until the application software (controlling pwm) takes over. I will use it as a temporary solution. Cheers Jan On Wednesday, 26 November 2014 08:45:34 UTC+11, Jason Lange wrote: > > > > - after power on the logic level on P8_13 is low (as I want it to be) >>> - after that (loading dtc overlay) the logic level on P8_13 become high >>> (I dont want it) >>> >> > Sorry, I missed this. The 74HC04 would work if it started high and stayed > that way. Do you need to use an overlay? Maybe if you modified the > initial device tree, perhaps with Roberts system for the 3.14 kernel it > would start high and you could flip it. > > -- 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.
