David: Thanks. I did not. How do I discover what those values ( 1 500000 0) are?
--Mark On Thursday, October 3, 2019 at 2:57:38 PM UTC-4, David Lechner wrote: > > Did you also change pwms = <&ehrpwm1 *0* 500000 0>; to pwms = <&ehrpwm1 > *1* 500000 0>; ? > > > > > On 10/3/19 9:44 AM, Mark A. Yoder wrote: > > Drew, David: > I've adapted the tinyDRM dtc to work with the Adafruit 2.4" TFT LCD > display. It's working fine with SPI 1. Currently it uses P9_14 for the > backlight. > > How do I switch it to use P9_16 for the backlight? > > I've tried changing all the P9_14's to P9_16s, but that doesn't work. > P9_14 is the A side of the pwm > and P9_16 is the B side, so I think there's a bit I need to flip, but > don't know what it is. > > --Mark > > p.s. The exercise for my students will be to switch it to SPI 0! > > [1] > https://github.com/MarkAYoder/BeagleBoard-exercises/tree/master/displays/ili9341/tinyDRM > > On Thursday, February 22, 2018 at 4:27:10 AM UTC-5, Drew Fustini wrote: >> >> fyi - I've created a bb.org-overlays pull request to add an overlay >> named BB-LCD-ADAFRUIT-18-SPI1-00A0.dts for the Adafruit 1.8" LCD on >> SPI1: >> >> https://github.com/beagleboard/bb.org-overlays/pull/68 >> >> On Wed, Feb 21, 2018 at 11:34 PM, Drew Fustini <[email protected]> >> wrote: >> > Thanks! I had DC and Reset swapped in the overlay file. I've fixed and >> the >> > display is now working! The console is displayed after bootup and >> libdrm >> > modetest is able to display color bars OK. >> > >> > Here is the updated dts: >> > https://gist.github.com/pdp7/aee5664598059c9b9a9020f107957f80 >> > >> > Thanks, >> > Drew >> > >> > On Feb 21, 2018 1:53 PM, "David Lechner" <[email protected]> wrote: >> >> >> >> On 02/21/2018 01:18 PM, Drew Fustini wrote: >> >>> >> >>> On Wed, Feb 21, 2018 at 11:01 AM, David Lechner <[email protected]> >> >> >>> wrote: >> >>>> >> >>>> Are you sure your phandles are correct here? They don't match the >> >>>> comments. >> >>>> Should it be <&gpio1 16 0> instead? >> >>>> >> >>>>> + reset-gpios = <&gpio1 16 0>; /* >> >>>>> reset:60 P9.12 GPIO1_28 */ >> >>>> >> >>>> >> >>>> And then <&gpio1 28 0> here? >> >>> >> >>> Here is the full BB-SPIDEV1-00A0.dts: >> >>> https://gist.github.com/pdp7/aee5664598059c9b9a9020f107957f80 >> >>> >> >>> I have P9.12 connected to LCD reset pin. I have P9.15 connected to >> >>> LCD dc pin. For fbtft driver, this translated to GPIO_60 for reset >> >>> and GPIO_48 for dc. This is based on this pinout diagram: >> >>> https://elinux.org/File:Cape_expansion_headers.PNG >> >>> >> >>> For this dts file, I was trying to figure out what appropriate gpio >> >>> phandle. I looked at this table for the P9 header: >> >>> https://elinux.org/File:H9Pinout.PNG >> >>> >> >>> I believe that gpio1[16] corresponds to P9.15 which is LCD dc pin, >> and >> >>> gpio1[28] corresponds to P9.12 which is LCD reset pin. >> >>> >> >>> My understanding of those mappings may be incorrect, so I'd >> appreciate >> >>> any additional feedback. >> >>> >> >> You understand correct, but I think you have swapped the values in >> your >> >> device tree overlay. You say "gpio1[16] corresponds to P9.15 which is >> LCD dc >> >> pin", but in the overlay, you have dc-gpios = <&gpio1 28 0>;. Likewise >> >> "gpio1[28] corresponds to P9.12 which is LCD reset pin.", but you have >> >> reset-gpios = <&gpio1 16 0>;. >> >> >> >> >> > >> > -- > 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] <javascript:>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/4d796e35-4967-453e-8d92-759f448755bb%40googlegroups.com > > <https://groups.google.com/d/msgid/beagleboard/4d796e35-4967-453e-8d92-759f448755bb%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > > -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/1687083f-2813-419d-8f29-c5969c45af88%40googlegroups.com.
