I'd agree except I am seeing it with two different LCD modules BB-View and Cape LCD3 & LCD4 - different designs, different circuit, different manufacturer.
I'll have to noodle on it. ~C On May 29, 2014, at 1:42 PM, John Syn <[email protected]> wrote: > > From: Colin Bester <[email protected]> > Reply-To: <[email protected]> > Date: Thursday, May 29, 2014 at 6:45 AM > To: <[email protected]> > Subject: Re: [beagleboard] BBB LCD3 Cape and inactivity > >> I just managed to get around to looking a little deeper into this and >> connected an oscilloscope to EHRPWM1A (which I figure is pin P9_14) and >> confirm that when writing a zero to brightness (using echo 0 > >> /sys/class/backlight/backlight.11/brightness) that the pin is low. Likewise >> write a '50' sets a 50% duty cycle and LCD brightens. I haven't set up >> environment to compile and test using 'c' files yet. >> >> With low on pin P9_14 the LCD is still visible. > > In that case this is a hardware issue. P9_14 is connected to the enable pin > of the LED backplane driver so the leds should turn off. > > Regards, > John Internet Disclaimer _________________ This message (including any attachments) contains confidential information intended for a specific individual and purpose, and may be protected by law. If you are not the intended recipient, you should delete this message and are hereby notified that any disclosure, copying, or distribution of this message, or the taking of any action based on it, is strictly prohibited. _________________ -- 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.
