IN short, use external hardware or do something cleaver like Peter G, and reverse polarity. *OR* have an external "switch" that switches the PWM line off, until you tell it to turn on. simples ?
On Tue, Nov 25, 2014 at 7:26 PM, Miguel Aveiro < [email protected]> wrote: > It's not a kernel driver, I believe it's the processor default mode. You > can check the processor datasheet: > > http://www.ti.com/product/AM3359/datasheet/terminal_description?search=pin,default#sprs717824 > > If you want to change it earlier than linux, you need to set the pin in > uboot (as far as I can understand). You can check the list because I know > that I have already read something about change default IO in BBB. Or > something about u-boot and gpio, like this: > http://www.crashcourse.ca/wiki/index.php/U-Boot_on_the_BBB > > Hopefully, this can help a little.... > > Miguel Aveiro > > On 25-11-2014 22:28, [email protected] wrote: > > thanks, unfortunately didn't work for me. > > On Wednesday, 26 November 2014 10:02:27 UTC+11, Peter Gregory wrote: >> >> I had the same issue driving RBG Leds. >> They were starting turned on full force since the PWM was driving high on >> boot. >> Changing the polarity worked for me. >> >> Is it possible the order of overlays is undoing your changes to >> bone_pwm_P8_13? >> Instead of: >> >> cape_enable=capemgr.enable_partno=BB-UART1,SPI-4SS,bone_ >> eqep2b,bone_pwm_P8_13,am33xx_pwm >> >> Maybe try it with your modifications being the last overlay to load: >> >> cape_enable=capemgr.enable_partno=BB-UART1,SPI-4SS,bone_ >> eqep2b,am33xx_pwm,bone_pwm_P8_13 >> > -- > 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. > > > -- > 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. > -- 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.
